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Prokaryotic Toxin-Antitoxins (Hardcover, 2013 ed.)
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Prokaryotic Toxin-Antitoxins (Hardcover, 2013 ed.)
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Prokaryotic Toxins - Antitoxins gives the first overview of an
exciting and rapidly expanding research field. Toxin - antitoxin
(TA) genes were discovered on plasmids 30 years ago. Since then it
has become evident that TA genes are highly abundant in bacterial
and archaeal chromosomes. TA genes code for an antitoxin that
combine with and neutralize a cognate toxin. When activated, the
toxins inhibit protein synthesis and cell growth and thereby induce
dormancy and multidrug tolerance (persistence). Remarkably, in some
species, the TA gene families have undergone dramatic expansions.
For example, the highly persistent major human pathogen
Mycobacterium tuberculosis has "100 TA loci. The large expansion of
TA genes by some organisms is a biological mystery. However, recent
observations indicate that TA genes contribute cumulatively to the
persistence of bacteria. This medically important phenomenon may
thus for the first time become experimentally tractable at the
molecular level.
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