JM101 for Protein Expression?

David-Paul Minde via (by davidminde from
Wed Oct 21 10:45:45 EST 2009

not all proteins are proteolytically unstable (e.g. GFP is rather robust
once it is folded)
most proteins are easy to degrade, however, because there is usually some
flexible part which is easily accessible for proteolysis ...
2009/10/21 <RayHL from>

> Hi everyone,
> I'm planning some protein expressions and right now, I'm choosing my
> expression strains. I'm wondering about the ability of JM101 cells to
> express recombinant proteins. At my old lab, we used them for some
> expressions (and it did work fine), but after checking the genotype, they
> don't seem to lack proteases like ompT or lon, and they don't seem to have
> T7 oR T5 RNA polymerase.
> So, the question is: why did they work at all? Or was it just a labeling
> error and we never really used JM101?
> Thanks for your answers in advance!
> Ray
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David Minde MSc (TUM)

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