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Week 1: May 16-20
From 2011.igem.org
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*One problem that arose was RecA’s constitutive presence in the cell. RecA promotes homologous recombination, but we do not want recombination between our constructed plasmid and the bacteria’s chromosome. '''Thus, we needed a mutant of RecA that would still work in the lambda phage system without catalyzing homologous recombination.''' | *One problem that arose was RecA’s constitutive presence in the cell. RecA promotes homologous recombination, but we do not want recombination between our constructed plasmid and the bacteria’s chromosome. '''Thus, we needed a mutant of RecA that would still work in the lambda phage system without catalyzing homologous recombination.''' | ||
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| + | [[File:RecA_mutant_experiment_diagram.jpg|thumb|500px]] | ||
[https://2011.igem.org/Team:Penn_State/Notebook| Back to Notebook] | [https://2011.igem.org/Team:Penn_State/Notebook| Back to Notebook] | ||
Revision as of 19:19, 2 June 2011
Monday
Today we laid out the weekly schedule for assembly, as follows
Day 1: grow culture
Day 2: Assemble (all day)
Day 3: grow colonies and check with PCR
Day 4: miniprep
Day 5: sequence results
Day 6: use miniprep
Note: Every step is done each day for different assemblies
We also began developing preliminary ideas for the summer project:
| Proposed Idea | Preliminary Thoughts |
|---|---|
| Bacterial photosynthesis | Up-regulate bacterial chlorophyll, BCHM=gene to increase chlorophyll production |
| Microbial fuel cells | Bacteria add electrons to Fe+3 and electrodes to create current, Use sacrificial anode (geobacter) |
| Serotonin sensor | ???? |
| Bacterial arithmetic | Use sRNAs to regulate translation to mirror arithmetic operations based on expression rates |
We spent the rest of the day researching these ideas to determine their plausibility.
Tuesday
- Jim started the day off with some information regarding geobacter. Jim explained the goal to optimize geobacter’s production of current in the presence of iron. The proteins responsible in geobacter are called cytochromes. In 2010, Missouri University of Science and Technology created a construct containing some of the cytochromes, so Jim proposed that we look into their part and see if we can optimize it further. The problem with working with Geobacter is its slow growth time, which makes growing cultures difficult. Thus, we determined that this project idea would not be suitable for a summer venture.
- Another idea was proposed today regarding radiation sensing and lambda phage repressors. This idea was proposed by Penn State’s 2007 team, but was never really brought to practice. We proposed a device that contained different strains of bacteria that correspond to different amounts of radiation exposure. Each strain would produce a pigment when exposed to a certain threshold of radiation. After receiving unanimous acceptance, we decided to further develop this radiation sensor. We spent the rest of the day researching the lambda phage system and mechanisms involved in radiation exposure.
- One problem that arose was RecA’s constitutive presence in the cell. RecA promotes homologous recombination, but we do not want recombination between our constructed plasmid and the bacteria’s chromosome. Thus, we needed a mutant of RecA that would still work in the lambda phage system without catalyzing homologous recombination.
Wednesday
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