Toxic protein for E. coli (M15)
junk at hgmp.mrc.ac.uk
Thu Sep 5 06:05:45 EST 2002
Historians believe that in newspost <3D77151C.F3347BF1 at abdn.ac.uk> on
Thu, 5 Sep 2002, Bertrand Collet <b.collet at abdn.ac.uk> penned the
following literary masterpiece:
>I use the pQE30 expression vector in M15 bacterial strain.
>I noticed that the growth rate of the bacterial cultures is the same
>without inducer for pQE30 only and for pQE30 expressing my protein.
So your clone is correctly switched off.
>However, when I induce with IPTG (1mM) pQE30 continue to grow normally
Souns right, pQE30 isn't expressing anything yet.
>but my expression plasmid culture grow very very slowly:
So you are getting something expressed. It is not surprising to see a
slow down in growth upon induction. It will vary expressed protein to
expressed protein. Have you monitored expression by SDS PAGE i.e. 0
hours, 1hour, 2, 3 4 etc. after induction?
>It appears that
>my protein is toxic for E. coli but that I do not have any leaking
Do you get an extra protein band produced for your protein in your pQE30
clone as opposed to pQE30 alone?
I love deadlines. I especially like the whooshing noise they make as
they go flying by.
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