Team:Paris/August 19

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(→Screening of the cloning of OmpR*, EnvZ* and FlhDC+promotor)
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|1 kb DNA ladder
|1 kb DNA ladder
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|positive control: pSB3K3 (strain S158)
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|positive control: <br>pSB3K3 (strain S158)
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|negative control: no template
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|negative control: <br>no template
|L133.1
|L133.1
|L133.2
|L133.2
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=Ligation FC=
=Ligation FC=

Revision as of 15:23, 19 August 2008

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Contents

Screening of the cloning of OmpR*, EnvZ* and FlhDC+promotor

well n° 1 2 3 4 5 6 7 8 9 10 11 12 13
sample 1 kb DNA ladder positive control:
pSB3K3 (strain S158) 		negative control:
no template 		L133.1 L133.2 L133.3 L134.1 L134.2 L134.3 L132.1 L132.2 L132.3 1 kb DNA ladder
expected size about 1 kb 0 kb
measured size 1 kb 0 kb 0 kb 0 kb 0 kb

Ligation FC

Screening of the cloning of E0240 and FlhDC+promotor

Spreading the clones in order to obtain single colonies

Strain Resistance Ligation DNA cloned vector size of the fragment amplified by VF & VR
S159.1 kanamycine L139.1 E0240 (GFP tripart) pSB3K3 1192 bp
S161.1 ampicilline L142.7 FlhDC+promotor pSB1A2 about 1,5 kb

The PCR screening of the transformants L139 and L142 of august 15th revealed several bands for a given clone including one band appearing at the right size.
There are 2 hypothesis:

  • The right clone was contaminated by a wrong one
  • The clone contains 2 plasmids: one with the insert and another one without the insert

In order to check these 2 hypothesis and to isolate (if it is possible) the right clone (containing the plasmid with the insert). We decided to spread the "clone" in question in a LB plate in order to carry out a PCR screening on single colonies.

  • Take of some bacteria from the glycerol stock
  • Resuspension in 400 µL of LB+antibiotic
  • Spreading of 200 µL in a LB agar plate containing the appropriate antibiotic
  • Incubation overnight at 37°C
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