Team:Calgary/Notebook/Protocols/decatecholization
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- | TITLE=Catechol Assay <i>E. coli</i> Cells| | + | TITLE=Catechol Assay in <i>E. coli</i> Cells| |
CONTENT=<html> | CONTENT=<html> | ||
<p>This assay is used to verify that catechol 2,3-dioxygenase (XylE) is converting catechol to the yellow compound 2-hydroxymuconic semialdehyde (2-HMS). For this procedure we used to the newly constructed XylE part. This part contains the TetR promoter the XylE gene and its native rbs site:</p> | <p>This assay is used to verify that catechol 2,3-dioxygenase (XylE) is converting catechol to the yellow compound 2-hydroxymuconic semialdehyde (2-HMS). For this procedure we used to the newly constructed XylE part. This part contains the TetR promoter the XylE gene and its native rbs site:</p> | ||
<ol> | <ol> | ||
- | <li>Grow up 2 ml overnight cultures in LB</li> | + | <li>Grow up 2 ml <a href="https://2012.igem.org/Team:Calgary/Notebook/Protocols/onculture">overnight cultures</a> in LB.</li> |
- | <li>Spin the cultures down and keep the supernatant </li> | + | <li>Spin the cultures down and keep the supernatant.</li> |
- | <li>Bring the supernatant to a concentration of 0.1 M of Catechol by using a 1M catechol stock solution</li> | + | <li>Bring the supernatant to a concentration of 0.1 M of Catechol by using a 1M catechol stock solution.</li> |
- | <li>The colour of the supernatant should change to bright yellow very quickly ( about 30 seconds) | + | <li>The colour of the supernatant should change to bright yellow very quickly (in about 30 seconds).</li> |
</ol> | </ol> | ||
+ | |||
+ | <h2>GC-MS Catechol Assay</h2> | ||
+ | In order to identify if the PetroBrick or <i>Micrococcus</i> was capable of further reducing catechol products, GC-MS was used. | ||
+ | <ol> | ||
+ | <li>Grow overnight cultures of the PetroBrick in LB at 37<sup>o</sup>C and <i>xylE</i> construct, or <i>Microccus</i> in yeast tryptone broth at 26<sup>o</sup>C. | ||
+ | <li>Subculture into the micrococcus or PetroBrick broth respectively and set up cultures with and without <i>xylE</i> as well as the appropriate control. | ||
+ | <li>Note: Prior to mixing, <i>xylE</i> and PetroBrick cultures were spun down at 4000 RPM for 5 min at room temperature and washed with 2x volume LB, spun down again, and then resuspended to the original volume to remove antibiotics which they were initially cultured in. | ||
+ | <li>Add 10 mM catechol to each tube, mix well, and cover in tin foil. | ||
+ | <li>Culture the cells at the appropriate temperature for 72 hours. | ||
+ | <li>Sonicate samples for 1 min using a Misonix Cell Disrupter set to Dial 11. | ||
+ | <li>Add 5 mL of ethyl acetate, shake well, and spin down at 4000 RPM for 5 min. at 4<sup>o</sup>C. | ||
+ | <li> Add 1mL of the ethyl acetate to a tube and reduce the volume to 0.3mL through heating. | ||
+ | <li> Samples were dried using sodium sulfate if any water layer was present and modified using trimethyl sylyl reagent. | ||
+ | <li> Samples were ran onto the GC-MS (<a href="https://2012.igem.org/Team:Calgary/Notebook/Protocols/Carbazole_GC-MS_Analysis">see protocol</a>) | ||
+ | <br><br><br><br><br><br><br><br><br> | ||
</html>}} | </html>}} |
Latest revision as of 02:54, 4 October 2012
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Catechol Assay in E. coli Cells
This assay is used to verify that catechol 2,3-dioxygenase (XylE) is converting catechol to the yellow compound 2-hydroxymuconic semialdehyde (2-HMS). For this procedure we used to the newly constructed XylE part. This part contains the TetR promoter the XylE gene and its native rbs site:
- Grow up 2 ml overnight cultures in LB.
- Spin the cultures down and keep the supernatant.
- Bring the supernatant to a concentration of 0.1 M of Catechol by using a 1M catechol stock solution.
- The colour of the supernatant should change to bright yellow very quickly (in about 30 seconds).
GC-MS Catechol Assay
In order to identify if the PetroBrick or Micrococcus was capable of further reducing catechol products, GC-MS was used.- Grow overnight cultures of the PetroBrick in LB at 37oC and xylE construct, or Microccus in yeast tryptone broth at 26oC.
- Subculture into the micrococcus or PetroBrick broth respectively and set up cultures with and without xylE as well as the appropriate control.
- Note: Prior to mixing, xylE and PetroBrick cultures were spun down at 4000 RPM for 5 min at room temperature and washed with 2x volume LB, spun down again, and then resuspended to the original volume to remove antibiotics which they were initially cultured in.
- Add 10 mM catechol to each tube, mix well, and cover in tin foil.
- Culture the cells at the appropriate temperature for 72 hours.
- Sonicate samples for 1 min using a Misonix Cell Disrupter set to Dial 11.
- Add 5 mL of ethyl acetate, shake well, and spin down at 4000 RPM for 5 min. at 4oC.
- Add 1mL of the ethyl acetate to a tube and reduce the volume to 0.3mL through heating.
- Samples were dried using sodium sulfate if any water layer was present and modified using trimethyl sylyl reagent.
- Samples were ran onto the GC-MS (see protocol)