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weird bacteria

Larry Farrell farrlarr at isu.edu
Mon Mar 3 00:17:42 EST 2003


Artem Evdokimov wrote:

> > > This is very interesting ! I would bet these bugs secrete biocins of
> some
> > > sort. If biocin secretion is associated with e.g. glucose in the medium,
> and
> > > if the bug is slightly sensitive to the biocins as well, perhaps this
> would
> > > explain the weird colony formation.
> >
> > [snip]
> >
> > Since all of the bacteria in the culture should carry the plasmid that
> codes for
> > production of the biocin, as well as the immunity protein that protects
> the
> > cells that carry the plasmid from the effects of the biocin, this is not a
> very
> > likely explanation.  One *could* propose a very high rate of spontaneous
> curing
> > but that is not consistent with maintenance of the plasmid and would have
> been
> > selected against.
>
> It doesn't have to be a plasmid, though - it could be in the chromosome :)
>
> I do agree that this explanation is stretching the limits of plausibility,
> though.
>
> Artem

That would make loss of immunity protein production at such a high rate even
more difficult to explain.


--
Larry D. Farrell, Ph.D.
Professor of Microbiology
Idaho State University





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