Journal
ACS CHEMICAL BIOLOGY
Volume 8, Issue 6, Pages 1140-1146Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cb4001603
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Funding
- Agence National de la Recherche (ANR) [ANR 2011 BSV5 024 01]
- National Institute of Allergy and Infectious Diseases [RO1 AI046626]
- French TGIR-RMN
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The maintenance of bacterial cell shape and integrity is largely attributed to peptidoglycan, a biopolymer highly cross-linked through D,D-transpeptidation. Peptidoglycan cross-linking is catalyzed by penicillin-binding proteins (PBPs) that are the essential target of beta-lactam antibiotics. PBPs are functionally replaced by L,D-transpeptidases (Ldts) in ampicillin-resistant mutants of Enterococcus faecium and in wild-type Mycobacterium tuberculosis. Ldts are inhibited in vivo by a single class of beta- the carbapenems, which act as a suicide substrate. We present here the first structure of a carbapenem-acylated L,D-transpeptidase, E. faecium Ldt(fm) acylated by ertapenem, which revealed key contacts between the carbapenem core and residues of the catalytic cavity of the enzyme. Significant reorganization of the antibiotic conformation occurs upon enzyme acylation. These results, together with the analysis of protein-to-carbapenem proton transfers, provide new insights into the mechanism of Ldt acylation by carbapenems.
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