A general reaction mechanism for carbapenem hydrolysis by mononuclear and binuclear metallo-β-lactamases View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-09-14

AUTHORS

María-Natalia Lisa, Antonela R. Palacios, Mahesh Aitha, Mariano M. González, Diego M. Moreno, Michael W. Crowder, Robert A. Bonomo, James Spencer, David L. Tierney, Leticia I. Llarrull, Alejandro J. Vila

ABSTRACT

Carbapenem-resistant Enterobacteriaceae threaten human health, since carbapenems are last resort drugs for infections by such organisms. Metallo-β-lactamases (MβLs) are the main mechanism of resistance against carbapenems. Clinically approved inhibitors of MBLs are currently unavailable as design has been limited by the incomplete knowledge of their mechanism. Here, we report a biochemical and biophysical study of carbapenem hydrolysis by the B1 enzymes NDM-1 and BcII in the bi-Zn(II) form, the mono-Zn(II) B2 Sfh-I and the mono-Zn(II) B3 GOB-18. These MβLs hydrolyse carbapenems via a similar mechanism, with accumulation of the same anionic intermediates. We characterize the Michaelis complex formed by mono-Zn(II) enzymes, and we identify all intermediate species, enabling us to propose a chemical mechanism for mono and binuclear MβLs. This common mechanism open avenues for rationally designed inhibitors of all MβLs, notwithstanding the profound differences between these enzymes' active site structure, β-lactam specificity and metal content.Carbapenem-resistant bacteria pose a major health threat by expressing metallo-β-lactamases (MβLs), enzymes able to hydrolyse these life-saving drugs. Here the authors use biophysical and computational methods and show that different MβLs share the same reaction mechanism, suggesting new strategies for drug design. More... »

PAGES

538

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41467-017-00601-9

DOI

http://dx.doi.org/10.1038/s41467-017-00601-9

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1091665579

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28912448


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