Difference between revisions of "Team:NCHU Taichung/Result"

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         <div class="ui sticky">
 
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           <div class="ui secondary vertical pointing menu">
 
           <div class="ui secondary vertical pointing menu">
             <a class="active item" href="#Introduction">Introduction</a>
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             <a class="active item" href="#VETIVER">Experiments on Vetiver</a>
             <a class="item" href="#Protocol">Protocol</a>
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             <a class="item" href="#ProteinPurification">Protein Purification</a>
             <a class="item" href="#Day1">Day 1</a>
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             <a class="item" href="#Arabidopsis">Arabidopsis</a>
             <a class="item" href="#Day2">Day 2</a>
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             <a class="item" href="#HAD_activity">Screen of HAD activity</a>
             <a class="item" href="#Day3">Day 3</a>
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             <a class="item" href="#Toxicology-CellViabilityTest">Toxicology-Cell Viability Test</a>
             <a class="item" href="#Day4">Day 4</a>
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             <a class="item" href="#Improved-part">Improved part</a>
             <a class="item" href="#Day5">Day 5</a>
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             <a class="item" href="#GrowthofRecombinantBacteria">The Growth of Recombinant Bacteria in TCDD Medium</a>
            <a class="item" href="#Result">Result</a>
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           </div>
 
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         </div>
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         <div class="ui sticky">
 
         <div class="ui sticky">
 
           <div class="ui secondary vertical pointing menu">
 
           <div class="ui secondary vertical pointing menu">
             <a class="active item" href="#Introduction">Introduction</a>
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             <a class="active item" href="#VETIVER">Experiments on Vetiver</a>
             <a class="item" href="#Protocol">Protocol</a>
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             <a class="item" href="#ProteinPurification">Protein Purification</a>
             <a class="item" href="#Day1">Day 1</a>
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             <a class="item" href="#Arabidopsis">Arabidopsis</a>
             <a class="item" href="#Day2">Day 2</a>
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             <a class="item" href="#HAD_activity">Screen of HAD activity</a>
             <a class="item" href="#Day3">Day 3</a>
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             <a class="item" href="#Toxicology-CellViabilityTest">Toxicology-Cell Viability Test</a>
             <a class="item" href="#Day4">Day 4</a>
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             <a class="item" href="#Improved-part">Improved part</a>
             <a class="item" href="#Day5">Day 5</a>
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             <a class="item" href="#GrowthofRecombinantBacteria">The Growth of Recombinant Bacteria in TCDD Medium</a>
            <a class="item" href="#Result">Result</a>
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           </div>
 
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           <tbody>
 
           <tbody>
 
             <tr>
 
             <tr>
               <td class="right aligned">B. cenocepacia 869T2</td>
+
               <td class="right aligned">
 +
                <i>B. cenocepacia 869T2</i>
 +
              </td>
 
               <td>X</td>
 
               <td>X</td>
 
               <td>O</td>
 
               <td>O</td>
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           </tbody>
 
           </tbody>
 
         </table>
 
         </table>
         <p>We found that if we inoculate vetiver plants with B. cenocepacia 869T2, the bacteria will decrease the length of
+
         <p>We found that if we inoculate vetiver plants with
          leaves but increase the number of tillers and leaves; inhibit the grow of main roots but enhance the strong lateral
+
          <i>B. cenocepacia 869T2</i>, the bacteria will decrease the length of leaves but increase the number of tillers and
          roots’ formation (we also see the same influence during the experiment of Arabidopsis thaliana). (Figure1 - Figure7)</p>
+
          leaves; inhibit the grow of main roots but enhance the strong lateral roots’ formation (we also see the same influence
 +
          during the experiment of Arabidopsis thaliana). (Figure1 - Figure7)</p>
 
         <p>Vetiver plants will get some negative influence when facing to TCDD stress. For example, their leaves number, leaves
 
         <p>Vetiver plants will get some negative influence when facing to TCDD stress. For example, their leaves number, leaves
 
           length, and roots length will not grow well as where growing under the general condition without TCDD. However,
 
           length, and roots length will not grow well as where growing under the general condition without TCDD. However,
 
           not only as above mentioned that Vetiver plants' leaves number and tiller will dramatically increase when they
 
           not only as above mentioned that Vetiver plants' leaves number and tiller will dramatically increase when they
           are inoculated with endophytic bacteria B. cenocepacia 869T2 but if the vetiver plants are also in the TCDD treatment
+
           are inoculated with endophytic bacteria
          in same time, this effect seems quite more obvious.</p>
+
          <i>B. cenocepacia 869T2</i> but if the vetiver plants are also in the TCDD treatment in same time, this effect seems
         <p>Therefore, we can understand that the endophytic bacteria B. cenocepacia strain 869T2 can not only survive in high
+
          quite more obvious.</p>
          TCDD concentration condition and do some positive effect on its host but also can use the TCDD as a kind of resource
+
         <p>Therefore, we can understand that the endophytic bacteria
          for itself to achieve something that still unrevealed.</p>
+
          <i>B. cenocepacia strain 869T2</i> can not only survive in high TCDD concentration condition and do some positive
         <div class="ui fluid image" id="labelImg">
+
          effect on its host but also can use the TCDD as a kind of resource for itself to achieve something that still unrevealed.</p>
 +
         <div
 +
          class="ui fluid image" id="labelImg">
 
           <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/8/8b/T--NCHU_Taichung--VETIVER3.png">
 
           <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/8/8b/T--NCHU_Taichung--VETIVER3.png">
 
           <div class="ui pointing label">Figure 3. Vetiver plants’ leaves number in the different treatments.</div>
 
           <div class="ui pointing label">Figure 3. Vetiver plants’ leaves number in the different treatments.</div>
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           <div class="ui hidden header"></div>
 
           <div class="ui hidden header"></div>
 
         </div>
 
         </div>
         <h3 class="ui header">ENDOPHYTIC BACTERIA EXIST RECHECK</h3>
+
         <h3 class="ui dividing header">ENDOPHYTIC BACTERIA EXIST RECHECK</h3>
 +
        <div class="ui hidden header"></div>
 
         <div class="ui fluid image" id="labelImg">
 
         <div class="ui fluid image" id="labelImg">
 
           <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/2/2b/T--NCHU_Taichung--VETIVER8.png">
 
           <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/2/2b/T--NCHU_Taichung--VETIVER8.png">
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           completely and dilute the ground liquid with 10 times, and then spread it into LB agar plate for culturing the
 
           completely and dilute the ground liquid with 10 times, and then spread it into LB agar plate for culturing the
 
           target bacteria. Last, we observe the morphology of a single colony to check the two bacteria. A single colony
 
           target bacteria. Last, we observe the morphology of a single colony to check the two bacteria. A single colony
           of B. cenocepacia 869T2 is small, circular, entire, raised, glistening veined, yellow-green. Also, there have no
+
           of
           any bacteria present in the control sample.</p>
+
          <i>B. cenocepacia 869T2</i> is small, circular, entire, raised, glistening veined, yellow-green. Also, there have
         <p>Accordingly, we know that B. cenocepacia 869T2 has a great endophytic character and can live in vetiver plants for
+
           no any bacteria present in the control sample.</p>
          at least 30 days during our experiment.</p>
+
         <p>Accordingly, we know that
         <h3 class="ui header">Analysis of TCDD concentration in plants</h3>
+
          <i>B. cenocepacia 869T2</i> has a great endophytic character and can live in vetiver plants for at least 30 days during
 +
          our experiment.</p>
 +
        <div class="ui hidden header"></div>
 +
         <h3 class="ui dividing header">Analysis of TCDD concentration in plants</h3>
 
         <p>The concentration of dioxin in the plant samples in our experiment was tested by Worthies Engineering Consultant
 
         <p>The concentration of dioxin in the plant samples in our experiment was tested by Worthies Engineering Consultant
 
           Co., Ltd. according to the "Test Method for Dioxin and Polychlorinated Biphenyl Residues in Food (CNS 14758 N6369)"
 
           Co., Ltd. according to the "Test Method for Dioxin and Polychlorinated Biphenyl Residues in Food (CNS 14758 N6369)"
 
           published by the MOHW of Executive Yuan.</p>
 
           published by the MOHW of Executive Yuan.</p>
         <p>As the following report presents, the sample which had not been inoculated with B. cenocepacia 869T2 but planted
+
         <p>As the following report presents, the sample which had not been inoculated with
          in TCDD contained matrix directly was be detected that having 343.253 pg/g TCDD concentration (Table 2) ; the sample
+
          <i>B. cenocepacia 869T2</i> but planted in TCDD contained matrix directly was be detected that having 343.253 pg/g
          which had been inoculated with B. cenocepacia 869T2 and then planted in TCDD contained matrix was be detected that
+
          TCDD concentration (Table 2) ; the sample which had been inoculated with
          having 2.12257 pg/g TCDD concentration (Table 3) . </p>
+
          <i>B. cenocepacia 869T2</i> and then planted in TCDD contained matrix was be detected that having 2.12257 pg/g TCDD
         <p>The vetiver plants inoculated with B. cenocepacia 869T2 shows about 162 times less TCDD concentration than the plants
+
          concentration (Table 3) . </p>
          didn't be inoculated. Based on this result, it becomes much more solid for us to point out that the endophytic
+
         <p>The vetiver plants inoculated with
           bacteria B. cenocepacia 869T2 has the super strong TCDD degradation ability and therefore has the highly potential
+
          <i>B. cenocepacia 869T2</i> shows about 162 times less TCDD concentration than the plants didn't be inoculated. Based
           to act an extremely important role in our program. </p>
+
          on this result, it becomes much more solid for us to point out that the endophytic bacteria
         <div class="ui center aligned small header">Table 2. Analysis report of sample didn’t inoculate with B. cenocepacia 869T2</div>
+
           <i>B. cenocepacia 869T2</i> has the super strong TCDD degradation ability and therefore has the highly potential to
 +
           act an extremely important role in our program. </p>
 +
         <div class="ui center aligned small header">Table 2. Analysis report of sample didn’t inoculate with
 +
          <i>B. cenocepacia 869T2</i>
 +
        </div>
 
         <div class="ui fluid image">
 
         <div class="ui fluid image">
 
           <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/1/1e/T--NCHU_Taichung--VETIVER9.png">
 
           <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/1/1e/T--NCHU_Taichung--VETIVER9.png">
 
           <div class="ui hidden header"></div>
 
           <div class="ui hidden header"></div>
 
         </div>
 
         </div>
         <div class="ui center aligned small header">Table 3. Analysis report of sample did inoculate with B. cenocepacia 869T2</div>
+
         <div class="ui center aligned small header">Table 3. Analysis report of sample did inoculate with
 +
          <i>B. cenocepacia 869T2</i>
 +
        </div>
 
         <div class="ui fluid image">
 
         <div class="ui fluid image">
 
           <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/c/c6/T--NCHU_Taichung--VETIVER10.png">
 
           <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/c/c6/T--NCHU_Taichung--VETIVER10.png">
 
           <div class="ui hidden header"></div>
 
           <div class="ui hidden header"></div>
 
         </div>
 
         </div>
 +
      </div>
 +
      <div class="ui olive segment" id="ProteinPurification">
 +
        <h1 class="ui hidden header"></h1>
 +
        <h2 class="ui header">Protein purification</h2>
 +
        <h3 class="ui dividing header">HAD purification (use Immobilized Metal Affinity Chromatography )</h3>
 +
        <div class="ui hidden header"></div>
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/1/16/T--NCHU_Taichung--pur1.png">
 +
          <div class="ui pointing label">HAD cloned in PET system is overexpressed successfully in E.coli</div>
 +
          <div class="ui hidden header"></div>
 +
        </div>
 +
        <h3 class="ui dividing header">Laccase purification result (use Immobilized Metal Affinity Chromatography )</h3>
 +
        <div class="ui hidden header"></div>
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/7/76/T--NCHU_Taichung--pur2.png">
 +
          <div class="ui pointing label">Laccase cloned in PET system somehow is not overexpressed in E.coli </div>
 +
          <div class="ui hidden header"></div>
 +
        </div>
 +
      </div>
 +
      <div class="ui olive segment" id="Arabidopsis">
 +
        <h1 class="ui hidden header"></h1>
 +
        <h2 class="ui header">Arabidopsis</h2>
 +
        <h3 class="ui dividing header">Figure 1.
 +
          <div class="sub header">Morphological effects caused by TCDD on
 +
            <i>A. thaliana</i>. </div>
 +
        </h3>
 +
        <div class="ui hidden header"></div>
 +
        <div class="ui grid">
 +
          <div class="eight wide column" id="labelImg">
 +
            <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/0/02/T--NCHU_Taichung--arabi1.png">
 +
            <div class="ui pointing label">(a) Morphological anomalies in
 +
              <i>A. thaliana</i> as response to TCCD-exposure after 14 days at indicated concentrations (0ppm). </div>
 +
          </div>
 +
          <div class="eight wide column" id="labelImg">
 +
            <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/2/25/T--NCHU_Taichung--arabi2.png">
 +
            <div class="ui pointing label">(a) Morphological anomalies in
 +
              <i>A. thaliana</i> as response to TCCD-exposure after 14 days at indicated concentrations (0.05ppm). </div>
 +
          </div>
 +
          <div class="eight wide column" id="labelImg">
 +
            <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/9/9b/T--NCHU_Taichung--arabi3.png">
 +
            <div class="ui pointing label">(b) The phenotype of
 +
              <i>A. thaliana</i> after grow 14 days without TCDD.</div>
 +
          </div>
 +
          <div class="eight wide column" id="labelImg">
 +
            <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/e/ed/T--NCHU_Taichung--arabi4.png">
 +
            <div class="ui pointing label">(b) The phenotype of
 +
              <i>A. thaliana</i> after grow 14 days with TCDD.</div>
 +
          </div>
 +
        </div>
 +
        <div class="ui hidden header"></div>
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/c/c8/T--NCHU_Taichung--arabi5.png">
 +
          <div class="ui pointing label">(c) Four average data with or without TCDD show on
 +
            <i>A. thaliana</i> .</div>
 +
          <div class="ui hidden header"></div>
 +
        </div>
 +
        <h3 class="ui dividing header">Figure 2.</h3>
 +
        <div class="ui hidden header"></div>
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/1/1e/T--NCHU_Taichung--arabi6.png">
 +
          <div class="ui pointing label">
 +
            <i>Arabidopsis thaliana</i> after 10 days TCDD exposure and
 +
            <i>Burkholderia cenocepacia</i> 869T2 inoculation.</div>
 +
          <div class="ui hidden header"></div>
 +
        </div>
 +
        <p class="longP">We analyzed the effects of 2, 3, 7, 8-TCDD on the growth of
 +
          <i>A. thaliana</i> for 14 days. Morphologically, the roots and leaves of
 +
          <i>A. thaliana</i> are very different: First, the difference between the control plants(TCDD-) and the experimental
 +
          plants (TCDD+) is 15 mm. The experimental plants are twice shorter than the control plants. ( Fig. 1a) Second,
 +
          the experimental plants are smaller and weaker than the control plants. ( Fig. 1b) This information indicated that
 +
          the existence of TCDD provoked important morphological difference in
 +
          <i>A. thaliana</i>. In another result of experiment, we also find the roots of the
 +
          <i>A. thaliana</i> inoculated with
 +
          <i>Burkholderia cenocepacia</i> 869T2 are particularly different: their roots are short but very strong, their leaves
 +
          are small but dark green. And the most difference is that inhibit the grow of main roots but enhance the strong
 +
          lateral roots. ( Fig. 2) This information can be used as a reference in the future.</p>
 +
        <h3 class="ui dividing header">Figure 3.
 +
          <div class="sub header">The result of inoculating endophytic bacteria in
 +
            <i>Arabidopsis</i> plants for 7 days.</div>
 +
        </h3>
 +
        <div class="ui hidden header"></div>
 +
        <div class="ui grid">
 +
          <div class="eight wide column" id="labelImg">
 +
            <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/7/77/T--NCHU_Taichung--arabi3-1.png">
 +
            <div class="ui pointing label">(a)
 +
              <i>Burkholderia cenocepacia</i> 869T2 exist for 7 days in
 +
              <i>A. thaliana</i>. </div>
 +
          </div>
 +
          <div class="eight wide column" id="labelImg">
 +
            <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/1/18/T--NCHU_Taichung--arabi3-2.png">
 +
            <div class="ui pointing label">(b)
 +
              <i>B. phytofirmans</i> PsJN exist for 7 days in
 +
              <i>A. thaliana</i>. </div>
 +
          </div>
 +
          <div class="eight wide column" id="labelImg">
 +
            <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/4/4c/T--NCHU_Taichung--arabi3-3.png">
 +
            <div class="ui pointing label">(c)
 +
              <i> B. cenocepacia</i> 869T2 exist for 7 days with 0.05 ppm of TCDD in
 +
              <i>A. thaliana</i>.</div>
 +
          </div>
 +
          <div class="eight wide column" id="labelImg">
 +
            <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/1/18/T--NCHU_Taichung--arabi3-4.png">
 +
            <div class="ui pointing label">(d)
 +
              <i>B. phytofirmans</i> PsJN exist for 7 days with 0.05 ppm of TCDD in
 +
              <i>A. thaliana</i>.</div>
 +
          </div>
 +
        </div>
 +
        <h3 class="ui dividing header">Figure 4.
 +
          <div class="sub header">The result of inoculating endophytic bacteria in
 +
            <i>Arabidopsis</i> plants for 14 days.</div>
 +
        </h3>
 +
        <div class="ui hidden header"></div>
 +
        <div class="ui grid center aligned">
 +
          <div class="row">
 +
            <div class="eight wide column" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/7/7b/T--NCHU_Taichung--arabi4-a-1.png">
 +
            </div>
 +
            <div class="eight wide column" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/5/5a/T--NCHU_Taichung--arabi4-a-2.png">
 +
            </div>
 +
          </div>
 +
          <div class="row">
 +
            <div class="ui label">(a)
 +
              <i>Burkholderia cenocepacia</i> 869T2 exist for 14 days in
 +
              <i>A. thaliana</i>.</div>
 +
          </div>
 +
          <div class="row">
 +
            <div class="eight wide column" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/5/5d/T--NCHU_Taichung--arabi4-b-1.png">
 +
            </div>
 +
            <div class="eight wide column" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/0/0a/T--NCHU_Taichung--arabi4-b-2.png">
 +
            </div>
 +
          </div>
 +
          <div class="row">
 +
            <div class="ui label">(b)
 +
              <i>B. phytofirmans</i> PsJN exist for 14 days in
 +
              <i>A. thaliana</i>. </div>
 +
          </div>
 +
          <div class="row">
 +
            <div class="eight wide column" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/9/92/T--NCHU_Taichung--arabi4-c-1.png">
 +
            </div>
 +
            <div class="eight wide column" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/9/9d/T--NCHU_Taichung--arabi4-c-2.png">
 +
            </div>
 +
          </div>
 +
          <div class="row">
 +
            <div class="ui label">(c)
 +
              <i>B. cenocepacia</i> 869T2 exist for 14 days with 0.05 ppm of TCDD in
 +
              <i>A. thaliana</i>. </div>
 +
          </div>
 +
          <div class="row">
 +
            <div class="eight wide column" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/d/d2/T--NCHU_Taichung--arabi4-d-1.png">
 +
            </div>
 +
            <div class="eight wide column" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/7/79/T--NCHU_Taichung--arabi4-d-2.png">
 +
            </div>
 +
          </div>
 +
          <div class="row">
 +
            <div class="ui label">(d)
 +
              <i>B. phytofirmans</i> PsJN exist for 14 days with 0.05 ppm of TCDD in
 +
              <i>A. thaliana</i>.</div>
 +
          </div>
 +
        </div>
 +
        <div class="ui hidden header"></div>
 +
        <p class="longP">We test two endophitic bacteria (
 +
          <i>Burkholderia cenocepacia</i> 869T2 and
 +
          <i>Burkholderia phytofirmans</i> PsJN) how long they exist in
 +
          <i>Arabidopsis thaliana</i>. In the beginning, we inoculate
 +
          <i>B. cenocepacia</i> 869T2 and
 +
          <i>B. phytofirmans</i> PsJN with OD600=0.4 into
 +
          <i> Arabidopsis</i> plants. On the seventh and fourteenth day, we collect the sample of experiment. Before grinding
 +
          the plants, we wash them for sterile water and confirm whether we wash the surface bacteria on
 +
          <i>Arabidopsis</i> plants. Then, we grind the
 +
          <i>Arabidopsis</i> plants and dilute their liquid with 10 times, and put it to LB plate for 30℃ during a day. After
 +
          a day, we observe the morphology of a single colony to check the two bacteria. A single colony of
 +
          <i>B. cenocepacia</i> 869T2 is small, circular, entire, raised, glistening veined, yellow-green, and
 +
          <i>B. phytofirmans</i> PsJN is very small, circular, entire, raised, rough, white. (the right picture of Fig. 3) The
 +
          result was consistent with a single colony of two bacteria. Moreover, the washing water does not see any bacteria.
 +
          (the left picture of Fig. 3) Therefore, no matter which bacteria with or without TCDD plate in
 +
          <i>Arabidopsis</i> plants they stay, all of two show the endophytic character in
 +
          <i>Arabidopsis</i> plants.</p>
 +
      </div>
 +
      <div class="ui olive segment" id="HAD_activity">
 +
        <h1 class="ui hidden header"></h1>
 +
        <h2 class="ui header">Screen of HAD activity</h2>
 +
        <p class="longP">We have a substrate called 2-chloropropionic acid (2-CPA) for HAD activity test.HAD can take off chloride anion from
 +
          the substrate;thus, we can then add silver cation to the solution to form silver chloride,which is white precipitate.When
 +
          silver chloride is exposed to light,it will become hydrogen gas and silver.Therefore, if the solution contains
 +
          more chloride anion,the color of silver will be deeper.</p>
 +
        <h4 class="ui teal header label">Result: our HAD works!!!</h4>
 +
        <div class="ui hidden header"></div>
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/d/d2/T--NCHU_Taichung--had.png">
 +
          <div class="ui hidden header"></div>
 +
        </div>
 +
      </div>
 +
      <div class="ui olive segment" id="Toxicology-CellViabilityTest">
 +
        <h1 class="ui hidden header"></h1>
 +
        <h2 class="ui header">Toxicology-Cell Viability Test</h2>
 +
        <div class="ui hidden header"></div>
 +
        <h3 class="ui header">MTT assay</h3>
 +
        <p class="longP">Viability of cells was assessed by measuring the formation of a formazan from MTT spectrophotometric assay test,
 +
          modified after Mosmann’s (1983) study. HEP G2 were incubated with 0.5 mg/mL MTT for 2 hours at 37°C at the end
 +
          of the experiment. After washing with DMSO, the purple formazan was extracted from cells and was photometrically
 +
          determined at 595 nm.</p>
 +
        <h3 class="ui header">Results (36hrs)</h3>
 +
        <p class="longP">The results of cell viability measured by MTT assay is shown in Figure 1. After incubating in CO
 +
          <sub>2</sub> incubator for 36 hours and assayed in vitro on the HEP G2 cells using the MTT assay, the values for the
 +
          0.25, 12.5 and 62.5 nM TCDD-treated cells ranged from 0.34-to 0.18-fold lower than that for the primary human HEP
 +
          G2, respectively. However, the two concentrations of HAD (10, and 20μM) provided in vitro activities on cell viability
 +
          against the tested TCDD compound. As the following picture, the decrease in the level of enzyme reached statistical
 +
          significance at 10, and 20μM concentrations of DHA against TCDD toxicity.</p>
 +
        <div class="ui hidden header"></div>
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/4/49/T--NCHU_Taichung--tox.png">
 +
          <div class="ui pointing label">Figure 1.</div>
 +
          <div class="ui hidden header"></div>
 +
        </div>
 +
        <h3 class="ui header">Reference</h3>
 +
        <ol class="ui list">
 +
          <li value="・">T. H., G. F., & Y. M. (2016). Ameliorative effects of docosahexaenoic acid on the toxicity induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin
 +
            in cultured rat hepatocytes.
 +
            <i>Toxicol Ind Health</i>, 32(6), 1074-1085.</li>
 +
        </ol>
 +
      </div>
 +
      <div class="ui olive segment" id="Improved-part">
 +
        <h1 class="ui hidden header"></h1>
 +
        <h2 class="ui header">Improved part
 +
          <div class="sub header">Engineer part: BBa_J364007 in pSB1C3 to become a shuttle vector (BBa_K2546004) </div>
 +
        </h2>
 +
        <div class="ui hidden header"></div>
 +
        <p class="longP">Using restriction enzyme and Polymerase Chain Reaction, we replace the Ori of BBa_J364007 in pSB1C3. This make plasmid
 +
          become a shuttle vector which can replicate in broad host range. Checking this plasmid with EcoRI and PstI or XbaI
 +
          and SpeI to see if the plasmid be cut off. By two groups of restriction enzymes, the result will get two band:5389bp
 +
          and 1100bp (figure 1). It is also an evidence shows that our plasmid have prefix and suffix. With prefix and suffix,
 +
          anyone can easily use our vector to perform the function of gene well. Moreover, we use interlab protocol ‘Cell
 +
          growth, sampling, and assay’, to test the performance of Green Fluorescent Protein(GFP) of BBa_K2546004-GFP. The
 +
          result reveals that BBa_K2546004-GFP can express GFP well in
 +
          <i>Burkholderia cenocepacia</i> Strain 869T2. It even have much higher efficient to express GFP than the original
 +
          plasmid: BBa_J364007 in pSB1C3 in
 +
          <i>Escherichia coli</i>(figure 2,figure 3). Therefore, we prove BBa_J364007 in pSB1C3 to replicate in
 +
          <i>Burkholderia cenocepacia</i> Strain 869T2, and prove the efficient of expressing GFP.</p>
 +
        <div class="ui hidden header"></div>
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/9/9c/T--NCHU_Taichung--impp1.png">
 +
          <div class="ui pointing label">Figure 1. BBa_K2546004 RE digestion result: Using EcoRI and PstI or XbaI and SpeI to proof that we have complete
 +
            BBa_K2546004</div>
 +
          <div class="ui hidden header"></div>
 +
        </div>
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/2/2e/T--NCHU_Taichung--impp2.png">
 +
          <div class="ui pointing label">The evidence of RFP in BBa_K2546004</div>
 +
          <div class="ui hidden header"></div>
 +
        </div><!--
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/a/a2/T--NCHU_Taichung--impp3.png">
 +
          <div class="ui pointing label">The colony of BBa K2546004 and BBa J044500-pSB1C3 on plate</div>
 +
          <div class="ui hidden header"></div>
 +
        </div>*/-->
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/e/e5/T--NCHU_Taichung--impp4.png">
 +
          <div class="ui pointing label">Figure 2. the quantity of GFP performed by BBa_J364007(pSB1C3) in
 +
            <i>Escherichia coli</i>, BBa_K2546004-GFP in
 +
            <i>Escherichia coli</i>, and BBa_K2546004-GFP in
 +
            <i>Burkholderia cenocepacia</i> Strain 869T2.</div>
 +
          <div class="ui hidden header"></div>
 +
        </div>
 +
        <div class="ui fluid image" id="labelImg">
 +
          <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/3/32/T--NCHU_Taichung--impp5.png">
 +
          <div class="ui pointing label">Figure 3. the quantity of GFP/per OD performed by BBa_J364007(pSB1C3) in
 +
            <i>Escherichia coli</i>, BBa_K2546004-GFP in
 +
            <i>Escherichia coli</i>, and BBa_K2546004-GFP in
 +
            <i>Burkholderia cenocepacia</i> Strain 869T2.</div>
 +
          <div class="ui hidden header"></div>
 +
        </div>
 +
      </div>
 +
      <div class="ui olive segment" id="GrowthofRecombinantBacteria">
 +
        <h1 class="ui hidden header"></h1>
 +
        <h2 class="ui header">The Growth of Recombinant Bacteria in TCDD Medium</h2>
 +
        <div class="ui hidden header"></div>
 +
        <p class="longP">The growth curves of the recombinant bacteria under different TCDD concentration treatments were tested to dissect
 +
          the functions. </p>
 +
        <div class="ui hidden header"> </div>
 +
        <h3 class="ui header"> Single gene construct</h3>
 +
        <ol>
 +
          <li>Both pET24a/HAD construct and the vector control pET24a grew similar in the medium without TCDD . The strain HAD
 +
            construct display better growth compare to control with 0.05ppm, 0.1ppm TCDD treatment (Fig. 1). This result
 +
            indicated that HAD promoted the bacteria growth under TCDD treatment as expect.
 +
            <div class="ui hidden header"></div>
 +
            <div class="ui fluid image" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/a/a0/T--NCHU_Taichung--fig1.png">
 +
              <div class="ui pointing label">Fig. 1. Growth of the control strain pET24A and the recombinant train HAD in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium</div>
 +
              <div class="ui hidden header"></div>
 +
            </div>
 +
          </li>
 +
          <li>pET21b/TonB construct grew worse under higher concentration (0.1ppm, 0.2ppm) of TCDD than the lower one (0ppm,
 +
            0.05ppm) (Fig. 2 ) . It may result from the transporter protein TonB that intake TCDD may be toxic to the cell.
 +
            <div
 +
              class="ui hidden header"></div>
 +
            <div class="ui fluid image" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/c/c1/T--NCHU_Taichung--fig2.png">
 +
              <div class="ui pointing label">Fig. 2. Growth of the control strain pET21b and the recombinant train TonB in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium.</div>
 +
              <div class="ui hidden header"></div>
 +
            </div>
 +
          </li>
 +
          <li>The growth of strain TLcc declined in high TCDD concentration (Fig. 3). In our hypothesis, TLcc degrades TCDD,
 +
            but it’s possible that the free radical attack the ring structure and cause damages to bacteria as shown in our
 +
            results.
 +
            <div class="ui hidden header"></div>
 +
            <div class="ui fluid image" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/0/08/T--NCHU_Taichung--fig3.png">
 +
              <div class="ui pointing label">Fig. 3. Growth of the control strain pET21b and the recombinant train TLcc in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium.</div>
 +
              <div class="ui hidden header"></div>
 +
            </div>
 +
          </li>
 +
        </ol>
 +
        <h3 class="ui header">Dual genes </h3>
 +
        <ol>
 +
          <li>The growth of strain HAD+TonB didn’t show defect impact compared to control (pET24a+pET21b) under high TCDD concentration
 +
            (Fig. 4). The growth of HAD+TLcc (J23100) displayed slightly inhibited by TCDD compare to control J23100 (Fig.
 +
            5). These results may indicate that the two construct, HAD+TonB and HAD+TLcc, function in the bacteria that detoxify
 +
            TCDD.
 +
            <div class="ui hidden header"></div>
 +
            <div class="ui fluid image" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/4/4b/T--NCHU_Taichung--fig4.png">
 +
              <div class="ui pointing label">Fig. 4. Growth of the control strain pET24a+pET21b and the recombinant train HAD+TonB in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium.</div>
 +
              <div class="ui hidden header"></div>
 +
            </div>
 +
            <div class="ui hidden header"></div>
 +
            <div class="ui fluid image" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/7/76/T--NCHU_Taichung--fig5.png">
 +
              <div class="ui pointing label">Fig. 5. Growth of the control strain J23100 and the recombinant strain HAD+TLcc (J23100), in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium.</div>
 +
              <div class="ui hidden header"></div>
 +
            </div>
 +
          </li>
 +
        </ol>
 +
        <h3 class="ui header">Three genes construct (tested pathway)</h3>
 +
        <ol>
 +
          <li>TonB+HAD+TLcc (J23100) had better growth with 0, 0.05, 0.1ppm TCDD treatment (Fig. 6). This indicated that the
 +
            toxicity effect of TCDD can be detoxified due to the synergistic functions of the three genes-the uptake of TonB
 +
            transporter, reduced by HAD enzyme, and breaking down by the laccase.
 +
            <div class="ui hidden header"></div>
 +
            <div class="ui fluid image" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/9/9b/T--NCHU_Taichung--fig6.png">
 +
              <div class="ui pointing label">Fig. 6. Growth of the control strain pET21b and the recombinant strain TonB+HAD+TLcc(J23100) in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium.</div>
 +
              <div class="ui hidden header"></div>
 +
            </div>
 +
          </li>
 +
          <li>The toluene is taken as the solvent control of TCDD which didn’t cause much influence to the growth of bacteria
 +
            (Fig. 7).
 +
            <div class="ui hidden header"></div>
 +
            <div class="ui fluid image" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/7/78/T--NCHU_Taichung--fig7.png">
 +
              <div class="ui pointing label">Fig. 7. Growth of the strain pET21b in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm toluene medium.</div>
 +
              <div class="ui hidden header"></div>
 +
            </div>
 +
          </li>
 +
        </ol>
 +
<ol>
 +
         
 +
            <div class="ui hidden header"></div>
 +
            <div class="ui fluid image" id="labelImg">
 +
              <img class="ui image clmnImg" src="https://static.igem.org/mediawiki/2018/f/fa/T--NCHU_Taichung--ntab1.png">
 +
              <div class="ui pointing label">Table 1. tested strains</div>
 +
              <div class="ui hidden header"></div>
 +
            </div>
 +
            <p>a. Display better growth with TCDD treatment</p>
 +
            <p>b. Display worse growth with TCDD treatment</p>
 +
         
 +
        </ol>
 +
        <div class="ui hidden header"></div>
 
       </div>
 
       </div>
 
     </div>
 
     </div>

Latest revision as of 03:54, 18 October 2018

NCHU_Taichung

Result

THE RESULTS OF EXPERIMENTS ON VETIVER

Phenotype Comparison

Figure 1. Vetiver+TCDD+869T2
Figure 2. Vetiver+TCDD

Before the experiment was started, vetiver plants were transplanted from field to greenhouse and grew under the same settings for 30 days. After the above pretreatment, we started the experiments with triple replication of four different treatment (Table 1) and then having analyses on some observable phenotypic characteristics.

Label N Label B Label H Label I
B. cenocepacia 869T2 X O X O
TCDD X X O O

We found that if we inoculate vetiver plants with B. cenocepacia 869T2, the bacteria will decrease the length of leaves but increase the number of tillers and leaves; inhibit the grow of main roots but enhance the strong lateral roots’ formation (we also see the same influence during the experiment of Arabidopsis thaliana). (Figure1 - Figure7)

Vetiver plants will get some negative influence when facing to TCDD stress. For example, their leaves number, leaves length, and roots length will not grow well as where growing under the general condition without TCDD. However, not only as above mentioned that Vetiver plants' leaves number and tiller will dramatically increase when they are inoculated with endophytic bacteria B. cenocepacia 869T2 but if the vetiver plants are also in the TCDD treatment in same time, this effect seems quite more obvious.

Therefore, we can understand that the endophytic bacteria B. cenocepacia strain 869T2 can not only survive in high TCDD concentration condition and do some positive effect on its host but also can use the TCDD as a kind of resource for itself to achieve something that still unrevealed.

Figure 3. Vetiver plants’ leaves number in the different treatments.
Figure 4. Phenotypes of vetiver plants’ overground part in the different treatments.
Figure 5. Vetiver plants’ leaves length in the different treatments.
Figure 6. Vetiver plants’ roots number in the different treatments.
Figure 7. Phenotypes of vetiver plants’ underground part in the different treatments.

ENDOPHYTIC BACTERIA EXIST RECHECK

Figure 8. Recheck of 30 days after endophytic bacteria inoculation.

On day 30, we harvested the vetiver plants for rechecking whether endophytic bacteria still exist.

First, we used bleach, EtOH, and sterile water to surface-sterilize plants. Second, we ground the vetiver plants completely and dilute the ground liquid with 10 times, and then spread it into LB agar plate for culturing the target bacteria. Last, we observe the morphology of a single colony to check the two bacteria. A single colony of B. cenocepacia 869T2 is small, circular, entire, raised, glistening veined, yellow-green. Also, there have no any bacteria present in the control sample.

Accordingly, we know that B. cenocepacia 869T2 has a great endophytic character and can live in vetiver plants for at least 30 days during our experiment.

Analysis of TCDD concentration in plants

The concentration of dioxin in the plant samples in our experiment was tested by Worthies Engineering Consultant Co., Ltd. according to the "Test Method for Dioxin and Polychlorinated Biphenyl Residues in Food (CNS 14758 N6369)" published by the MOHW of Executive Yuan.

As the following report presents, the sample which had not been inoculated with B. cenocepacia 869T2 but planted in TCDD contained matrix directly was be detected that having 343.253 pg/g TCDD concentration (Table 2) ; the sample which had been inoculated with B. cenocepacia 869T2 and then planted in TCDD contained matrix was be detected that having 2.12257 pg/g TCDD concentration (Table 3) .

The vetiver plants inoculated with B. cenocepacia 869T2 shows about 162 times less TCDD concentration than the plants didn't be inoculated. Based on this result, it becomes much more solid for us to point out that the endophytic bacteria B. cenocepacia 869T2 has the super strong TCDD degradation ability and therefore has the highly potential to act an extremely important role in our program.

Table 2. Analysis report of sample didn’t inoculate with B. cenocepacia 869T2
Table 3. Analysis report of sample did inoculate with B. cenocepacia 869T2

Protein purification

HAD purification (use Immobilized Metal Affinity Chromatography )

HAD cloned in PET system is overexpressed successfully in E.coli

Laccase purification result (use Immobilized Metal Affinity Chromatography )

Laccase cloned in PET system somehow is not overexpressed in E.coli

Arabidopsis

Figure 1.
Morphological effects caused by TCDD on A. thaliana.

(a) Morphological anomalies in A. thaliana as response to TCCD-exposure after 14 days at indicated concentrations (0ppm).
(a) Morphological anomalies in A. thaliana as response to TCCD-exposure after 14 days at indicated concentrations (0.05ppm).
(b) The phenotype of A. thaliana after grow 14 days without TCDD.
(b) The phenotype of A. thaliana after grow 14 days with TCDD.
(c) Four average data with or without TCDD show on A. thaliana .

Figure 2.

Arabidopsis thaliana after 10 days TCDD exposure and Burkholderia cenocepacia 869T2 inoculation.

We analyzed the effects of 2, 3, 7, 8-TCDD on the growth of A. thaliana for 14 days. Morphologically, the roots and leaves of A. thaliana are very different: First, the difference between the control plants(TCDD-) and the experimental plants (TCDD+) is 15 mm. The experimental plants are twice shorter than the control plants. ( Fig. 1a) Second, the experimental plants are smaller and weaker than the control plants. ( Fig. 1b) This information indicated that the existence of TCDD provoked important morphological difference in A. thaliana. In another result of experiment, we also find the roots of the A. thaliana inoculated with Burkholderia cenocepacia 869T2 are particularly different: their roots are short but very strong, their leaves are small but dark green. And the most difference is that inhibit the grow of main roots but enhance the strong lateral roots. ( Fig. 2) This information can be used as a reference in the future.

Figure 3.
The result of inoculating endophytic bacteria in Arabidopsis plants for 7 days.

(a) Burkholderia cenocepacia 869T2 exist for 7 days in A. thaliana.
(b) B. phytofirmans PsJN exist for 7 days in A. thaliana.
(c) B. cenocepacia 869T2 exist for 7 days with 0.05 ppm of TCDD in A. thaliana.
(d) B. phytofirmans PsJN exist for 7 days with 0.05 ppm of TCDD in A. thaliana.

Figure 4.
The result of inoculating endophytic bacteria in Arabidopsis plants for 14 days.

(a) Burkholderia cenocepacia 869T2 exist for 14 days in A. thaliana.
(b) B. phytofirmans PsJN exist for 14 days in A. thaliana.
(c) B. cenocepacia 869T2 exist for 14 days with 0.05 ppm of TCDD in A. thaliana.
(d) B. phytofirmans PsJN exist for 14 days with 0.05 ppm of TCDD in A. thaliana.

We test two endophitic bacteria ( Burkholderia cenocepacia 869T2 and Burkholderia phytofirmans PsJN) how long they exist in Arabidopsis thaliana. In the beginning, we inoculate B. cenocepacia 869T2 and B. phytofirmans PsJN with OD600=0.4 into Arabidopsis plants. On the seventh and fourteenth day, we collect the sample of experiment. Before grinding the plants, we wash them for sterile water and confirm whether we wash the surface bacteria on Arabidopsis plants. Then, we grind the Arabidopsis plants and dilute their liquid with 10 times, and put it to LB plate for 30℃ during a day. After a day, we observe the morphology of a single colony to check the two bacteria. A single colony of B. cenocepacia 869T2 is small, circular, entire, raised, glistening veined, yellow-green, and B. phytofirmans PsJN is very small, circular, entire, raised, rough, white. (the right picture of Fig. 3) The result was consistent with a single colony of two bacteria. Moreover, the washing water does not see any bacteria. (the left picture of Fig. 3) Therefore, no matter which bacteria with or without TCDD plate in Arabidopsis plants they stay, all of two show the endophytic character in Arabidopsis plants.

Screen of HAD activity

We have a substrate called 2-chloropropionic acid (2-CPA) for HAD activity test.HAD can take off chloride anion from the substrate;thus, we can then add silver cation to the solution to form silver chloride,which is white precipitate.When silver chloride is exposed to light,it will become hydrogen gas and silver.Therefore, if the solution contains more chloride anion,the color of silver will be deeper.

Result: our HAD works!!!

Toxicology-Cell Viability Test

MTT assay

Viability of cells was assessed by measuring the formation of a formazan from MTT spectrophotometric assay test, modified after Mosmann’s (1983) study. HEP G2 were incubated with 0.5 mg/mL MTT for 2 hours at 37°C at the end of the experiment. After washing with DMSO, the purple formazan was extracted from cells and was photometrically determined at 595 nm.

Results (36hrs)

The results of cell viability measured by MTT assay is shown in Figure 1. After incubating in CO 2 incubator for 36 hours and assayed in vitro on the HEP G2 cells using the MTT assay, the values for the 0.25, 12.5 and 62.5 nM TCDD-treated cells ranged from 0.34-to 0.18-fold lower than that for the primary human HEP G2, respectively. However, the two concentrations of HAD (10, and 20μM) provided in vitro activities on cell viability against the tested TCDD compound. As the following picture, the decrease in the level of enzyme reached statistical significance at 10, and 20μM concentrations of DHA against TCDD toxicity.

Figure 1.

Reference

  1. T. H., G. F., & Y. M. (2016). Ameliorative effects of docosahexaenoic acid on the toxicity induced by 2,3,7,8-tetrachlorodibenzo-p-dioxin in cultured rat hepatocytes. Toxicol Ind Health, 32(6), 1074-1085.

Improved part
Engineer part: BBa_J364007 in pSB1C3 to become a shuttle vector (BBa_K2546004)

Using restriction enzyme and Polymerase Chain Reaction, we replace the Ori of BBa_J364007 in pSB1C3. This make plasmid become a shuttle vector which can replicate in broad host range. Checking this plasmid with EcoRI and PstI or XbaI and SpeI to see if the plasmid be cut off. By two groups of restriction enzymes, the result will get two band:5389bp and 1100bp (figure 1). It is also an evidence shows that our plasmid have prefix and suffix. With prefix and suffix, anyone can easily use our vector to perform the function of gene well. Moreover, we use interlab protocol ‘Cell growth, sampling, and assay’, to test the performance of Green Fluorescent Protein(GFP) of BBa_K2546004-GFP. The result reveals that BBa_K2546004-GFP can express GFP well in Burkholderia cenocepacia Strain 869T2. It even have much higher efficient to express GFP than the original plasmid: BBa_J364007 in pSB1C3 in Escherichia coli(figure 2,figure 3). Therefore, we prove BBa_J364007 in pSB1C3 to replicate in Burkholderia cenocepacia Strain 869T2, and prove the efficient of expressing GFP.

Figure 1. BBa_K2546004 RE digestion result: Using EcoRI and PstI or XbaI and SpeI to proof that we have complete BBa_K2546004
The evidence of RFP in BBa_K2546004
Figure 2. the quantity of GFP performed by BBa_J364007(pSB1C3) in Escherichia coli, BBa_K2546004-GFP in Escherichia coli, and BBa_K2546004-GFP in Burkholderia cenocepacia Strain 869T2.
Figure 3. the quantity of GFP/per OD performed by BBa_J364007(pSB1C3) in Escherichia coli, BBa_K2546004-GFP in Escherichia coli, and BBa_K2546004-GFP in Burkholderia cenocepacia Strain 869T2.

The Growth of Recombinant Bacteria in TCDD Medium

The growth curves of the recombinant bacteria under different TCDD concentration treatments were tested to dissect the functions.

Single gene construct

  1. Both pET24a/HAD construct and the vector control pET24a grew similar in the medium without TCDD . The strain HAD construct display better growth compare to control with 0.05ppm, 0.1ppm TCDD treatment (Fig. 1). This result indicated that HAD promoted the bacteria growth under TCDD treatment as expect.
    Fig. 1. Growth of the control strain pET24A and the recombinant train HAD in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium
  2. pET21b/TonB construct grew worse under higher concentration (0.1ppm, 0.2ppm) of TCDD than the lower one (0ppm, 0.05ppm) (Fig. 2 ) . It may result from the transporter protein TonB that intake TCDD may be toxic to the cell.
    Fig. 2. Growth of the control strain pET21b and the recombinant train TonB in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium.
  3. The growth of strain TLcc declined in high TCDD concentration (Fig. 3). In our hypothesis, TLcc degrades TCDD, but it’s possible that the free radical attack the ring structure and cause damages to bacteria as shown in our results.
    Fig. 3. Growth of the control strain pET21b and the recombinant train TLcc in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium.

Dual genes

  1. The growth of strain HAD+TonB didn’t show defect impact compared to control (pET24a+pET21b) under high TCDD concentration (Fig. 4). The growth of HAD+TLcc (J23100) displayed slightly inhibited by TCDD compare to control J23100 (Fig. 5). These results may indicate that the two construct, HAD+TonB and HAD+TLcc, function in the bacteria that detoxify TCDD.
    Fig. 4. Growth of the control strain pET24a+pET21b and the recombinant train HAD+TonB in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium.
    Fig. 5. Growth of the control strain J23100 and the recombinant strain HAD+TLcc (J23100), in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium.

Three genes construct (tested pathway)

  1. TonB+HAD+TLcc (J23100) had better growth with 0, 0.05, 0.1ppm TCDD treatment (Fig. 6). This indicated that the toxicity effect of TCDD can be detoxified due to the synergistic functions of the three genes-the uptake of TonB transporter, reduced by HAD enzyme, and breaking down by the laccase.
    Fig. 6. Growth of the control strain pET21b and the recombinant strain TonB+HAD+TLcc(J23100) in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm TCDD medium.
  2. The toluene is taken as the solvent control of TCDD which didn’t cause much influence to the growth of bacteria (Fig. 7).
    Fig. 7. Growth of the strain pET21b in 0ppm, 0.05ppm, 0.1ppm, 0.2ppm toluene medium.
    Table 1. tested strains

    a. Display better growth with TCDD treatment

    b. Display worse growth with TCDD treatment