Paris/October 4

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Revision as of 12:34, 4 October 2007 by Landrain (Talk | contribs)

Minipreps

  • from S49 = pKD46
  • pY-2P-IntC

Transformation of W121 and FR781 with pKD46

Houston we got a problem, the upstream construction for wanner lose the Chloramphenicol resistance

[Frt-CmR-Frt-pTet>>lox66-gfpTripart] (L58)

- First, we got an abnormally short length for the PCR with the wanner primers (about 1,7kb instead of 2,1kb; see October 2)
- Then i did a PCR on the same plasmid (L58) with the primers O18&O19. We got the same pattern of length (1,7kb and another one at about 3,5kb)
- To investigate the possibility to have lost 400kb in the CmR gene leading to the loss of resistence to Cm for the strain, i put some clones of L58 on plates with either Ampicilline or Chloramphenicol (10µg/mL).

> the clones grew on Amp but not on Cm...

it confirms the hypothesis of a loss inside the CmR gene.

>of course the results for the sequencing will gice the last word. They should come on Friday in late afternoon.
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