| The
procedure is as follows:.
On Day 1 :
• Thaw an aliquot of competent cells on ice for 10 minutes
• Add to the competent cells 1µl of pAVD10 plasmid
(5ng/µl) on ice for 20 minutes .
(the cells are fragile: mix gently,
but do not pipette them)
• Heat-shock the transformation reaction in a 42°C
water bath for 2 minutes.
• Incubate the reactions on ice for 3 minutes.
• Add 450 µl of LB medium to each transformation,
and incubate the reactions at 37°C for 1 hour, with shaking,
at 200 rpm.
• Plate:
- 100 µl of
the transformation reaction (using a sterile spreader) onto
a LB + ampicillin plate and
- 100 µl onto
a LB + ampicillin + IPTG plate.
• Incubate the plates overnight at 37°C.
On Day 2 :
Count the number of colonies on the LB-ampicillin and LB-ampicillin-IPTG
plates.
Expected Results :
|
|
BL21(DE3) |
C41(DE3) |
C43(DE3) |
|
LB-Amp |
No colonies |
Colonies |
Colonies |
|
LB-Amp-IPTG |
No colonies |
No colonies |
Colonies |
|