Structure of Enterococcus faeciuml,d-transpeptidase acylated by ertapenem provides insight into the inactivation mechanism. - Université Grenoble Alpes
Article Dans Une Revue ACS Chemical Biology Année : 2012

Structure of Enterococcus faeciuml,d-transpeptidase acylated by ertapenem provides insight into the inactivation mechanism.

Vincent Dubée
Sébastien Triboulet
  • Fonction : Auteur
Jean-Emmanuel Hugonnet
  • Fonction : Auteur
Michel Arthur
Jean-Pierre Simorre

Résumé

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 β-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 β-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.

Dates et versions

hal-01321576 , version 1 (26-05-2016)

Identifiants

Citer

Lauriane Lecoq, Vincent Dubée, Sébastien Triboulet, Catherine M Bougault, Jean-Emmanuel Hugonnet, et al.. Structure of Enterococcus faeciuml,d-transpeptidase acylated by ertapenem provides insight into the inactivation mechanism.. ACS Chemical Biology, 2012, 8 (6), pp.1140-6. ⟨hal-01321576⟩
81 Consultations
0 Téléchargements

Altmetric

Partager

More