期刊
ELIFE
卷 5, 期 -, 页码 -出版社
ELIFE SCIENCES PUBLICATIONS LTD
DOI: 10.7554/eLife.19469
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资金
- National Institute of Allergy and Infectious Diseases [RO1 307 A1046626]
- Joint Program Initiative on Antimicrobial Research ZonMW [60-6090098-207]
- Joint Program Initiative on Antimicrobial Research NAPCLI
- National Institutes of Health [GM113172]
The target of beta-lactam antibiotics is the D,D-transpeptidase activity of penicillin-binding proteins (PBPs) for synthesis of 4 -> 3 cross-links in the peptidoglycan of bacterial cell walls. Unusual 3 -> 3 cross-links formed by L,D-transpeptidases were first detected in Escherichia coli more than four decades ago, however no phenotype has previously been associated with their synthesis. Here we show that production of the L,D-transpeptidase YcbB in combination with elevated synthesis of the (p)ppGpp alarmone by ReIA lead to full bypass of the D,D-transpeptidase activity of PBPs and to broad-spectrum beta-lactam resistance. Production of YcbB was therefore sufficient to switch the role of (p)ppGpp from antibiotic tolerance to high-level beta-lactam resistance. This observation identifies a new mode of peptidoglycan polymerization in E. coli that relies on an unexpectedly small number of enzyme activities comprising the glycosyltransferase activity of class A PBP1b and the D,D-carboxypeptidase activity of DacA in addition to the L,D-transpeptidase activity of YcbB.
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