IGEM:MIT/2005/Friday 8/12 Meeting Agenda and Minutes
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General Updates
- Biobricks request: please have up on wiki by end of today.
- Today: clean up in Kate's lab after lunch; spend rest time learning about lab space, doing lab duties, and organizing our stuff. Visualize a white tornado!
- Lets talk lab-use
SubTeam Updates
Format: what is the progress? what are the issues?
Input: Maxine
- Subtilis
- Advantages
- Is naturally competent (saves us time!)
- Disadvantages
- According to "The Permeability of the Wall Fabric of E. Coli and Bacillus subtilis,"
- E. coli and Subtilis pore size: 25kDa
- E. coli pore size (according to many other sources) 6Da
- Our fluorescein constructs: ~8-16 kDa
- The Com system in Subtilis degrades double stranded DNA and then resynthesizes one strand, so our fluorescein construct would not work
- We need to relearn all lab techniques, i.e. plating, etc. because of its different properties, such as pore production
- We need to remake much of the ToxR system (different promoters and ribosome binding sites) so that it can fit into subtilis
- According to "The Permeability of the Wall Fabric of E. Coli and Bacillus subtilis,"
- Conclusion: advantages not enough to outweight disadvantages at this point
- Advantages
- Most of the week was spent on helping FecA system
Receiver Head-Unit: Jenny
Receiver/Transmitter 1 - ToxR : Wiki-Will
- Activity:
-J07011 (ctx::gfp) might be correct, c/o gel test. Then again, it might not be. (see picture) -J07009 is here! Initial assembly attempts - J13002::J07009, J07009::J07006, J07009::J07043, J07009::J07044, J07009::J07045 promotor, rbs :: ToxR ToxR::malE ToxR::scFv(i) ToxR::scFv(ii) ToxR::scFv(iii) Every single plate of assemblies showed no growth this morning. I wonder what went wrong! can we back-track? my women's intuition tells me it was the transformation. -Some troubling news shows up in our Gel Purify of J07009. The picture implies J07009 (cut x/p) is ~1kb, and it should bee ~650kb
- This Weekend (team effort):
- Retry Assemblies / retry transformation - At the very least: miniprep large amounts of each biobrick being used right now.
Receiver/Transmitter 2 - FecA : Annie
- Updates
-QuikChange done on FecR, PhoA --> preparing to get them sequence FecA didn't get any colonies -BB FecA Promoter However, gel on digest shows lots of other bands -Recieve all primers reordered -Ligating RBS & FecI -Primers for PCR Tetracycline and Chloramphenicol resistance form hairpins and dimers Consistent with gel bands
- Questions
-Discuss the FecA Promoter gel bands with an advisor -Only 1 internal primer or both forward & reverse for sequencing? -Design new primers for PCR Tetracycline and Chloramphenicol? Any other ways?
Signal Processor: Ray
Actuator
No new updates.
Issues/Discussion
- Subtilis seems not particularly useful for us, although it might still be an option.
- Registry might want to think about subtilis as another organism to pay attention to
- Jenny's stuff needs to be passed on. Probably to Jen.
- Will: need to figure out what is happening with ToxR. Need assemblies to work!
- FecA System: Can do quick change on subparts of the FecA gene (2.3 kb). Can do not quickchange method, talk to Kate, she did this before.
- Change digest protocol... in general, lets look over our protocols
- Use program that helps design primers
- Issues with adding in the signal processing device:
- How many plasmids can stay in the cell?
- Drug markers
- compatibility of replication origins
- Levels of expression on plasmids
- Plasmids wont support infinitely long insert -- not longer than 10 kb
- How many plasmids can stay in the cell?
- Issue of load
- Lets do a System Integration Meeting