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From 2012.igem.org

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Contents 1 July 8th-14th 1.1 July 8th 1.2 July 9th 1.3 July 10th 1.4 July 11th 1.5 July 12th 1.6 July 13th

The salicylate reporter is analogous to the arsenic reporter, but with a salicylate-sensitive promoter. That is, in the presence of salicylate it will produce MtrB, completing the Mtr pathway and allowing Shewanella to produce current in our biosensor. In combination with the nah operon, this reporter will be able to detect naphthalene levels. Back to salicylate reporter week view

July 8th-14th

The focus of this week was to transfer our arsenic sensing plasmids to Shewanella strain JG700 via congugation with E.coli strain WM3064. After struggling to electroporate control plasmids, we consulted with Dr. Gralnick who reccomended proceeding with conjugation and kindly provided E.coli strain WM3064. This strain is auxotrophic for 2,6-Diaminopimelic Acid (DAP), which makes the strain useful for selecting against non-Shewanella conjugants.

July 8th

July 9th

Dylan performed a Phusion PCR with a single annealing temperature of 59 degrees Celsius using primers 27 and 28 for the final time. In the future, new primers will be used. The purpose of this PCR was to amplify p21. The PCR product was analyzed using agarose gel electrophoresis to determine if the desired 1.127 kb fragment is present. To transform our plasmids into Shewanella with conjugation, we had asked Dr. Jeff Gralnick for WM3064 E. coli for which plates containing 2,6-Diaminopimelic Acid (DAP) are required. In preparation to receive this strain, the plates with DAP and DAP/kanamycin were prepared.

July 10th

Caleb miniprepped strains containing plasmids p8, p9, p10, p15, and p16 (See our strain list) Also, our new freezer arrived. We cleaned and welcomed our new friend.

The WM3064 came in and we plated from the agar stab. Dylan set up two 18 mL/hr continuous flow reactors using 10x diluted LB and innoculated one of the reactors with JG700 and one with wild type Shewanella oneidensis MR-1.

July 11th

While Dylan and Danielle prepared plates containing DAP/chloramphenicol and DAP/ampicillin to grow transformed WM3064 on, Mark prepared electrocompetent stocks of WM3064 to be transformed later that day.

July 12th

Shweta prepared a glycerol stock of WM3064 for future use, and Dylan plated some remaining transformed WM3064 hoping to get more colonies of the successfully transformed cells.

Dylan and Mark submitted p8, p9, and p10 for sequencing using two different primers for each plasmid.

The previous night's p21 PCR seemed to have failed, even with the new primers. Based on the gel run by Claire, then analyzed by Dylan and Caleb.

July 13th

==July 14th==