Week 2: May 23-27

From 2011.igem.org

Revision as of 17:15, 3 June 2011

Monday

Reporters

The reporters continued research on the linkers to hold the fusion proteins.

Sensors

The sensor group ran PCR for four promoters (J23113, J23105, J23118, J23100). These constitutive promoters will exist in front of the RecA coding sequence.

All

The entire team met with Dr. Richard today to present our project. After hearing our proposal, Dr. Richard pointed out potential roadblocks and needs for fallback ideas:

For the RecA mutations, if we cannot eliminate the recombinase behavior, we may have to eliminate homologous material from our plasmid. This group should be finished in two weeks, and its members will be assigned a new task.

For reporters, in order to test the reporter, we need to use or develop an inducible promoter that will allow the reporter to emit pigment without the lambda sensor.

We also need to construct a control bar that will show if the cells in the dosimeter are dead and the device is working properly. This cell colony will feature a reporter with an inducible promoter that will be triggered by an unknown stimulus.

Dr. Richard also proposed a modeling endeavor comparing the reporting rates of Imperial’s system vs. our proposed redundant system, which features a second GFP fused to the enzyme with a linker cleaved by RecA in addition to the linker cleaved by tev.

Tuesday

Reporters

The reporter group decided on a few linkers to test in a fusion protein construct. These linkers are K243004 (4 amino acids), K105102 (10 amino acids) as well as the linker used in the Imperial College part, K316007. The reporters spent the rest of the time struggling to design primers for PCR. We needed primers for the XylE part of K316007, the linker used by Imperial College, K243004, K105012, the CI repressor/RecA cleavage site, the tev cleavage site, the GFP and flag tag complex and the LacZ part (J33210) The primers we designed are below:

Linker used in K316007 (designed by Ben)

Sequence:

5’ TATTGAATTCGCGGCCGCTTCTAGATGGCCGGCggaggttcaggaggcagcACCGGTTAATACTAGTAGCGGCCGCTGCAGTATT 3’

Forward:

5’ TATTGAATTCGCGGCCGCTTCTAGATGGCCGGCggaggttcagg 3'

Reverse:

5’ AATACTGCAGCGGCCGCTACTAGTATTAACCGGTgctgcctcctgaacctccGC 3’

K105102: 10 Amino Acid Linker(designed by Brian)

Annealing Temperature: 56.3°C

Sequence:

5' TATTGAATTCGCGGCCGCTTCTAGATGGCCGGCggtgaaaatttgtattttcaatctggtggtACCGGTTAATACTAGTAGCGGCCGCTGCAGTATT 3'

Forward:

5' TATTGAATTCGCGGCCGCTTCTAGATGGCCGGCggtgaaaatttgtattttcaa 3'

Reverse:

5' AATACTGCAGCGGCCGCTACTAGTATTAACCGGTaccaccagattgaaaatacaaattttcacc 3'

K243004: 4 Amino Acid Linker (designed by Alex)

Annealing Temperature: 57.78°C

Sequence:

5' TATTGAATTCGCGGCCGCTTCTAGATGGCCGGCggtggttctggtACCGGTTAATACTAGTAGCGGCCGCTGCAGTATT 3'

Forward:

5' TATTGAATTCGCGGCCGCTTCTAGATGGCCGGCggtggttctggtACC

Reverse:

5' AATACTGCAGCGGCCGCTACTAGTATTAACCGGTaccagaaccaccG 3'

tev Cleave Site (designed by Jim)

Annealing Temperature: 55.83°C

Sequence:

5' ATTAGAATTCGCGGCCGCTTCTAGATGGCCGGCgagaatttgtattttcagggtACCGGTTAATACTAGTAGCGGCCGCTGCAGATTA 3’

Forward:

5' ATTAGAATTCGCGGCCGCTTCTAGATGGCCGGCgagaatttgtattttcaggg 3'

Reverse: 5' TAATCTGCAGCGGCCGCTACTAGTATTAACCGGTACCCTGAAAATACAAATTCTC 3'

cI Cleave Site (designed by Jim)

Annealing Temperature: 56.13°C

Sequence:

Sensors

The sensor group purified their PCR products from yesterday. These genes were:

1. J23113
2. J23105
3. J23118
4. J23100

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