Difference between revisions of "Team:Ruia-Mumbai/Results"
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A successful attempt in standardising the ratio of catechu:slaked lime required for media formulation. | A successful attempt in standardising the ratio of catechu:slaked lime required for media formulation. | ||
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From the above observations it was concluded that the maximum intensity of red colour obtained from the solution was from the sample with 1:0.1 Catechu : slaked lime concentration. | From the above observations it was concluded that the maximum intensity of red colour obtained from the solution was from the sample with 1:0.1 Catechu : slaked lime concentration. | ||
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We narrowed down to four variants of the minimal medium ,M9, for processing samples collected from different sources. The four different media used were: | We narrowed down to four variants of the minimal medium ,M9, for processing samples collected from different sources. The four different media used were: | ||
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Revision as of 18:42, 17 October 2018
Experiment 1:
Catechu standardisation
A successful attempt in standardising the ratio of catechu:slaked lime required for media formulation.
After interactive sessions with various paanwalas we learned that the amount of catechu applied to paan is high whereas the amount of slaked lime applied is quite low keeping in mind its inflammatory properties.
With the above information we tried out various ratios of catechu:slaked lime so as to get the maximum intensity of the distinct red colour which is characteristic to the paan stains prevalent across the country.
From the above observations it was concluded that the maximum intensity of red colour obtained from the solution was from the sample with 1:0.1 Catechu : slaked lime concentration. Hence, the same ratio was used for the preparation of the stock with 10g Catechu and 1g slaked lime of which 1% was used for media preparation.
| Ratio (Catechu:slaked lime) | Amount of catechu(gms) | Boiling water (ml) | header not given | Slake lime (gms) | Absorbance at λmax= 254nm |
|---|---|---|---|---|---|
| 1:0.1 | 0.1 | 100 | Cool the | 0.01 | 1.319 |
| 1:0.2 | 0.1 | 100 | Solution | 0.02 | 1.206 |
| 1:0.3 | 0.1 | 100 | for 15-20 | 0.03 | 1.754 |
| 1:0.4 | 0.1 | 100 | mins | 0.04 | 1.871 |
| 1:0.5 | 0.1 | 100 | 0.05 | 1.921 |
From the above observations it was concluded that the maximum intensity of red colour obtained from the solution was from the sample with 1:0.1 Catechu : slaked lime concentration. Hence, the same ratio was used for the preparation of the stock with 10g Catechu and 1g slaked lime of which 1% was used for media preparation.
Experiment 2:
Media Formulation and Enrichment
Various media formulations for enriching natural samples with the aim of finding catechu degrading isolates.
We narrowed down to four variants of the minimal medium ,M9, for processing samples collected from different sources. The four different media used were:
Sample 2: Water from Ulhas River
- M9
- M9+Glucose
- M9+CS (catechu+slaked lime stock)
- M9+CS (catechu+slaked lime stock)
Sample 2: Water from Ulhas River
Experiment 3:
Isolation of organisms and identification by 16S rRNA sequencing
Isolation on solid media after enrichment of samples and identification of the isolates by 16s rRNA sequencing
Isolation was carried out by taking inoculum from the enrichment broths using various combinations (same as used for enrichment of samples) of solid media. Growth was seen on all the plates except on M9 minimal medium plates.
Isolates which were showing prominent degradation of colour on the plates were sent for identification by 16s rRNA sequencing.
Results from National Centre for Microbial Resource-NCCS for 16s rRNA sequencing:
Bacterial Strains:
Fungal Strains:
Results from National Centre for Microbial Resource-NCCS for 16s rRNA sequencing:
Bacterial Strains:
| Strain no. | Closest neighbour | Accession No. | % similarity |
|---|---|---|---|
| S2C1 | Klebsiella pneumoniae subsp. pneumonia DSM 30104(T) | AJJI01000018 | 99.66 |
| S2C2 | Klebsiella quasipneumoniae subsp.quasipneumoniae 01A030(T) | HG933296 | 99.73 |
Fungal Strains:
| Strain no. | Closest neighbour | Accession No. | % similarity |
|---|---|---|---|
| S1 | Aspergillus niger strain ATCC 16888 | AY373852.1 | 99 |
| A.niger | Aspergillus niger strain ATCC 16888 | AY373852.1 | 99 |
Experiment 4:
In search of potential enzymes that degrade catechu!
Literature survey and screening of various enzymes that break bonds in molecules having similar structures as that of components of catechu!
After having the sequencing results in hand we did a through literature survey to find out the potential enzymes present in the isolates which could degrade components of catechu. We used softwares like BRENDA, PUBMED, UNIPROT to obtain relevant information.
The major candidates from our literature survey were tannases and catechol dioxygenases.
On these grounds we also looked at various team wikis from the past years in search for similar projects. We found that Team Paris-Bettencourt has worked with catechol dioxygenases. We got in touch with them and they sent us their cloned enzymes [catechol-1,2-dioxygenase (CatA) and catechol-2,3-dioxygenase(XylE)] which we could successfully transform into DH5alpha cells. We tested these transformants on catechu and slaked lime media and the results were flabbergasting.
A distinct zone of clearance was observed around the streaks and spots of the growing culture on the catechu and slaked lime solid medium. Hence we decided to proceed with these cultures as well our natural isolates.
Experiment 5:
DEGRADATION - Chewing Catechu
Degradation of catechu by potential isolates and selected enzyme XylE in M9+CS broth medium.
Other than plates we checked the degradation activity of potential isolates in broth medium. Where the distinct visual difference between the control tube and isolates can be observed.
For quantifying the colour change
Experiment 6:
Cloning - Challenge Accepted!
Molecular cloning of the gblock fragments in pSB1C3 backbone (digestion, ligation, transformation) and their confirmation by diagnostic digest agarose gel run.
As all cloning strategies, there were few trial and error scenarios wrt to the ratios of DNA to be used for a perfectly assembled construct.
Ligation math for all the fragments were done and the process of digestion, ligation and transformation was carried out successfully to yield 2 well assembled constructs. The plasmid was again extracted from the selected clones on the plates and run an agarose electrophoresis gel after a single and dual cut diagnostic digest with EcoR1 and Pst1.
Construct 5
Experiment 7:
SDS-PAGE Protein Characterisation
After analysing a successful cloning, the plasmid DNA was then transferred into DH5a cells to have growing transformants for characterising protein expression.
The SDS-PAGE Coomassie Brilliant Blue stained gel was observed
Experiment 8:
Assay for detection of catechol-2,3-dioxygenase
An assay which will detect the presence of the enzyme catechol-2,3-dioxygenase which is a translational product of our cloned gene-XylE.
This assay gives a direct readout of the presence of the enzyme catechol-2,3-dioxygenase. The colourless substrate catechol is broken down to a yellow coloured product 2-hydroxymuconic semialdehyde (2-HMS) and this reaction is catalysed by the enzyme catechol-2,3-dioxygenase.
Intensity of the generated yellow colour was detected in the form of absorbance values.The absorbance readouts were taken at 415 nm at an interval of 5 minutes and graphs were prepared to interpret the generated data. The XylE gene in our construct is under the regulation of the pBAD promoter which is arabinose responsive. From the generated data we could conclude that with advancement in time, the absorbance of the system increases when the cells are grown in the presence of arabinose but remains fairly constant when grown in glucose. For more details see composite part
Intensity of the generated yellow colour was detected in the form of absorbance values.The absorbance readouts were taken at 415 nm at an interval of 5 minutes and graphs were prepared to interpret the generated data. The XylE gene in our construct is under the regulation of the pBAD promoter which is arabinose responsive. From the generated data we could conclude that with advancement in time, the absorbance of the system increases when the cells are grown in the presence of arabinose but remains fairly constant when grown in glucose. For more details see composite part
Experiment 9:
Versatility - Testing on dyes
Demonstrating versatility of construct/model to degrade common lab dyes other than paan stains.Clearance around the colony observed on plates containing several dyes.
After gaining insight of versatility point by Ajay Bio-Tech company, we tested our construct on chemically related laboratory dyes.
We inoculated our positive clones on luria bertani medium plates of 0.025% concentration of dyes which includes congo red,methylene blue and safranin. Clearance around the colony indicating degradation was distinctly observed after 48 hrs of incubation. This concludes the activity of enzyme/ action of catechewing coli on other stains/dyes giving us future prospective to work on project.