Difference between revisions of "Team:SHSBNU China/Improve"
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| − | + | As can be seen from the result, the experiment group showed the most decrease of sfGFP-SpyCatcher protein. The difference between the control group and experiment group was significant. Thus we could confirm our CsgA-SpyTag system was functional.</p> | |
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| + | Part BBa_K2684000 was improved from previous part <a href="http://parts.igem.org/Part:BBa_K1336002">BBa_K1336002</a>. Our team made a point mutation to eliminate the EcoR1 cutting site so that we can meet the standard of RFC10, a commonly-used standard for interchangeable parts which are based on idempotent assembly. We tested the enzyme activity of our part based on the weight of our sample. Formula: laccase activity (nmol/min/g) = ΔA /ε(ABTS mmolar extinction coefficient) / d * V (total volume of reaction) / V (volume of sample in the reaction, 0.025mL) / W (sample mass, g) * V (extracted liquid added, 1mL) / T (reaction time, 3 minutes) = 130 *ΔA / W. The result is shown as following: </p> | ||
| + | <p><img src="https://static.igem.org/mediawiki/2018/4/42/T--SHSBNU_China--Parts_Regis.png" style="width:50%"/></image></p> | ||
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| + | The improvement is valid since it was normally produced. | ||
| + | </p> | ||
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Revision as of 19:57, 17 October 2018
Improve
Overview
Previously, there was only CsgA part uploaded in iGEM parts website. Our Team improved part Part BBa_K1583000 by adding a SpyTag sequence. It fused to gene csgA, enabling CotA laccase to be fixed onto the biofilm to form a covalent bond--SpyTag-SpyCatcher.
Improvement Details
By using sfGFP-SpyCatcher protein, we tested the binding efficiency of the covalence SpyTag-SpyCatcher since sfGFP is a non-toxic and common used flurorescent protein. Gene csgA on the plasmid of pET28a was transferred into ΔMG1655 as control group. Gene csgA – spytag on the plasmid of pET28a was transferred into ΔMG1655 as experiment. The experiment was divided into 4 groups. The bateria in the Reaction Stock had neither csgA nor SpyTag in neither genome nor plasmid; the ones in Group 1 had csgA in the genome; the ones in Group 2 had sfGFP in the plasmid; the ones in Group 3 had csgA-SpyTag in the genome and the plasmid. The treatment of the experiment is followed by the procedure below:
The liquid after centrifugation was extracted and measured fluorescence.
As can be seen from the result, the experiment group showed the most decrease of sfGFP-SpyCatcher protein. The difference between the control group and experiment group was significant. Thus we could confirm our CsgA-SpyTag system was functional.
Part BBa_K2684000 was improved from previous part BBa_K1336002. Our team made a point mutation to eliminate the EcoR1 cutting site so that we can meet the standard of RFC10, a commonly-used standard for interchangeable parts which are based on idempotent assembly. We tested the enzyme activity of our part based on the weight of our sample. Formula: laccase activity (nmol/min/g) = ΔA /ε(ABTS mmolar extinction coefficient) / d * V (total volume of reaction) / V (volume of sample in the reaction, 0.025mL) / W (sample mass, g) * V (extracted liquid added, 1mL) / T (reaction time, 3 minutes) = 130 *ΔA / W. The result is shown as following:
The improvement is valid since it was normally produced.