7RPB image
Entry Detail
PDB ID:
7RPB
Title:
X-ray crystal structure of OXA-24/40 V130D in complex with meropenem
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2021-08-03
Release Date:
2022-07-06
Method Details:
Experimental Method:
Resolution:
1.97 Å
R-Value Free:
0.22
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Beta-lactamase
Mutations:V130D
Chain IDs:A
Chain Length:245
Number of Molecules:1
Biological Source:Acinetobacter baumannii
Primary Citation
Conformational flexibility in carbapenem hydrolysis drives substrate specificity of the class D carbapenemase OXA-24/40.
J.Biol.Chem. 298 102127 102127 (2022)
PMID: 35709986 DOI: 10.1016/j.jbc.2022.102127

Abstact

The evolution of multidrug resistance in Acinetobacter spp. increases the risk of our best antibiotics losing their efficacy. From a clinical perspective, the carbapenem-hydrolyzing class D β-lactamase subfamily present in Acinetobacter spp. is particularly concerning because of its ability to confer resistance to carbapenems. The kinetic profiles of class D β-lactamases exhibit variability in carbapenem hydrolysis, suggesting functional differences. To better understand the structure-function relationship between the carbapenem-hydrolyzing class D β-lactamase OXA-24/40 found in Acinetobacter baumannii and carbapenem substrates, we analyzed steady-state kinetics with the carbapenem antibiotics meropenem and ertapenem and determined the structures of complexes of OXA-24/40 bound to imipenem, meropenem, doripenem, and ertapenem, as well as the expanded-spectrum cephalosporin cefotaxime, using X-ray crystallography. We show that OXA-24/40 exhibits a preference for ertapenem compared with meropenem, imipenem, and doripenem, with an increase in catalytic efficiency of up to fourfold. We suggest that superposition of the nine OXA-24/40 complexes will better inform future inhibitor design efforts by providing insight into the complicated and varying ways in which carbapenems are selected and bound by class D β-lactamases.

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