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Title: Structural Basis of Activity against Aztreonam and Extended Spectrum Cephalosporins for Two Carbapenem-Hydrolyzing Class D β-Lactamases from Acinetobacter baumannii

Journal Article · · Biochemistry
DOI:https://doi.org/10.1021/bi501547k· OSTI ID:1178836
 [1];  [1];  [1];  [1];  [2];  [3];  [1];  [3];  [4];  [2];  [1];  [1]
  1. Grand Valley State Univ., Allendale, MI (United States). Dept. of Chemistry
  2. Grand Valley State Univ., Allendale, MI (United States). Dept. of Cell and Molecular Biology
  3. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Medicine, Pharmacology, Biochemistry, and Molecular Biology and Microbiology
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). UT/ORNL Center for Molecular Biophysics, Biosciences Division

The carbapenem-hydrolyzing class D β-lactamases OXA-23 and OXA-24/40 have emerged world-wide as causative agents for β-lactam antibiotic resistance in Acinetobacter species. Many variants of these enzymes have appeared clinically, including OXA-160 and OXA-225, which both contain a P→S substitution at homologous positions in the OXA-24/40 and OXA-23 backgrounds respectively. We purified OXA-160 and OXA-225 and used steady-state kinetic analysis to compare the substrate profiles of these variants to their parental enzymes, OXA-24/40 and OXA-23. OXA-160 and OXA-225 possess greatly enhanced hydrolytic activities against aztreonam, ceftazidime, cefotaxime and ceftriaxone when compared to OXA-24/40 and OXA-23. These enhanced activities are the result of much lower Km values, suggesting that the P→S substitution enhances the binding affinity of these drugs. We have determined the structures of the acylated forms of OXA-160 (with ceftazidime and aztreonam) and OXA-225 (ceftazidime). These structures show that the R1 oxyimino side-chain of these drugs occupies a space near the β5-β6 loop and the omega loop of the enzymes. The P→S substitution found in OXA-160 and OXA-225 results in a deviation of the β5-β6 loop, relieving the steric clash with the R1 side-chain carboxypropyl group of aztreonam and ceftazidime. We found that these results reveal worrying trends in the enhancement of substrate spectrum of class D β-lactamases, but may also provide a map for β-lactam improvement.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; 1R15AI082416; R15AI094489; 1I01BX001974; R01AI100560; R01 AI063517; P41GM103712; 085P1000817
OSTI ID:
1178836
Journal Information:
Biochemistry, Vol. 54, Issue 10; ISSN 0006-2960
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (6)

Intrinsic Class D β-Lactamases of Clostridium difficile journal December 2018
A gratuitous β-Lactamase inducer uncovers hidden active site dynamics of the Staphylococcus aureus BlaR1 sensor domain journal May 2018
Crystal Structure of Phosphoserine BlaC from Mycobacterium tuberculosis Inactivated by Bis(Benzoyl) Phosphate journal July 2019
Genetic and Biochemical Characterization of OXA-405, an OXA-48-Type Extended-Spectrum β-Lactamase without Significant Carbapenemase Activity journal April 2015
Antimicrobial Resistance Conferred by OXA-48 β-Lactamases: Towards a Detailed Mechanistic Understanding journal May 2021
Structural Analysis of The OXA-48 Carbapenemase Bound to A “Poor” Carbapenem Substrate, Doripenem journal September 2019