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2013 ; 8
(6
): 1140-6
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Structure of Enterococcus faeciuml,d-transpeptidase acylated by ertapenem
provides insight into the inactivation mechanism
#MMPMID23574509
Lecoq L
; Dubée V
; Triboulet S
; Bougault C
; Hugonnet JE
; Arthur M
; Simorre JP
ACS Chem Biol
2013[]; 8
(6
): 1140-6
PMID23574509
show ga
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 ?-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 ?-lactams, the carbapenems, which act as a
suicide substrate. We present here the first structure of a carbapenem-acylated
l,d-transpeptidase, E. faecium Ldtfm 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.