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Journal of Bacteriology, July 2007, p. 4671-4680, Vol. 189, No. 13
0021-9193/07/$08.00+0 doi:10.1128/JB.00403-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.
An Antibiotic-Inducible Cell Wall-Associated Protein That Protects Bacillus subtilis from Autolysis
Letal I. Salzberg and
John D. Helmann*
Department of Microbiology, Cornell University, Ithaca, New York 14853-8101
Received 19 March 2007/
Accepted 24 April 2007
In Bacillus subtilis, antibiotics that impair cell wall synthesis induce a characteristic stress response including the
W and
M regulons and the previously uncharacterized yoeB gene. Here we demonstrate that YoeB is a cell wall-associated protein with weak sequence similarity to a noncatalytic domain of class B penicillin-binding proteins. A yoeB-null mutant exhibits an increased rate of autolysis in response to cell wall-targeting antibiotics or nutrient depletion. This phenotype does not appear to be correlated with gross alterations in peptidoglycan structure or levels of autolysins. Promoter dissection experiments define a minimal region necessary for antibiotic-mediated induction of yoeB, and this region is highly conserved preceding yoeB homologs in close relatives of B. subtilis. These results support a model in which induction of YoeB in response to cell envelope stress decreases the activity of autolysins and thereby reduces the rate of antibiotic-dependent cell death.
* Corresponding author. Mailing address: Department of Microbiology, 370 Wing Hall, Cornell University, Ithaca, NY 14853. Phone: (607) 255-6570. Fax: (607) 255-3904. E-mail:
jdh9{at}cornell.edu
Published ahead of print on 4 May 2007.
Journal of Bacteriology, July 2007, p. 4671-4680, Vol. 189, No. 13
0021-9193/07/$08.00+0 doi:10.1128/JB.00403-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.
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