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J. Bacteriol., Dec 1997, 7251-7256, Vol 179, No. 23
H Antelmann, S Engelmann, R Schmid, A Sorokin, A Lapidus and M Hecker
SigmaB-dependent general stress proteins (Gsps) of Bacillus subtilis are
essential for the development of glucose-starvation-induced cross-
resistance to oxidative challenge. However, the proteins directly involved
in this nonspecific resistance to oxidative stress have to be identified.
We found that one prominent Gsp displayed strong sequence similarity to the
previously characterized oxidative-stress-inducible MrgA protein of B.
subtilis and to the starvation-induced Dps/PexB protein of Escherichia
coli. We therefore designated this prominent Gsp Dps. While MrgA belongs to
the peroxide-stress-inducible proteins needed for the H2O2-inducible
adaptive response to oxidative stress, Dps belongs to the proteins induced
by heat, salt, or ethanol stress and after starvation for glucose but not
by a sublethal oxidative challenge. Primer extension experiments identified
two overlapping promoters upstream of the coding region of dps, one being
sigmaB dependent (PB) and the other being sigmaB independent (P1). Both
promoters contribute to the basal level of dps during growth. After stress
or during entry into the stationary phase, transcription from PB strongly
increased whereas transcription from P1 decreased. Mutant strains lacking
Dps completely failed to develop glucose-starvation- induced resistance to
oxidative stress. These results confirm our suggestion that
sigmaB-dependent general stress proteins of B. subtilis are absolutely
required for the development of nonspecific resistance to oxidative stress.
Copyright © 1997, American Society for Microbiology
Expression of a stress- and starvation-induced dps/pexB-homologous gene is controlled by the alternative sigma factor sigmaB in Bacillus subtilis
Institut fur Mikrobiologie und Molekularbiologie, Ernst-Moritz-Arndt- Universitat, Greifswald, Germany.
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