Atomic-Resolution Structure of a Class C β-Lactamase and Its Complex with Avibactam.

Abstract:

:β-Lactamases (BLs) are important antibiotic-resistance determinants that significantly compromise the efficacy of valuable β-lactam antibacterial drugs. Thus, combinations with BL inhibitor were developed. Avibactam is the first non-β-lactam BL inhibitor introduced into clinical practice. Ceftazidime-avibactam represents one of the few last-resort antibiotics available for the treatment of infections caused by near-pandrug-resistant bacteria. TRU-1 is a chromosomally encoded AmpC-type BL of Aeromonas enteropelogenes, related to the FOX-type BLs and constitutes a good model for class C BLs. TRU-1 crystals provided ultrahigh-resolution diffraction data for the native enzyme and for its complex with avibactam. A comparison of the native and avibactam-bound structures revealed new details in the conformations of residues relevant for substrate and/or inhibitor binding. Furthermore, a comparison of the TRU-1 and Pseudomonas aeruginosa AmpC avibactam-bound structures revealed two inhibitor conformations that were likely to correspond to two different states occurring during inhibitor carbamylation/recyclization.

journal_name

ChemMedChem

journal_title

ChemMedChem

authors

Pozzi C,Di Pisa F,De Luca F,Benvenuti M,Docquier JD,Mangani S

doi

10.1002/cmdc.201800213

subject

Has Abstract

pub_date

2018-07-18 00:00:00

pages

1437-1446

issue

14

eissn

1860-7179

issn

1860-7187

journal_volume

13

pub_type

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