Local interactions with the Glu166 base and the conformation of an active site loop play key roles in carbapenem hydrolysis by the KPC-2 β-lactamase

Furey, Ian M.; Mehta, Shrenik C.; Sankaran, Banumathi; Hu, Liya; Prasad, B. V. Venkataram; Palzkill, Timothy

doi:10.1016/j.jbc.2021.100799

Title: Local interactions with the Glu166 base and the conformation of an active site loop play key roles in carbapenem hydrolysis by the KPC-2 β-lactamase

Journal Article · Fri Jan 01 00:00:00 EST 2021 · Journal of Biological Chemistry

DOI:https://doi.org/10.1016/j.jbc.2021.100799· OSTI ID:1785783

Furey, Ian M.;

; Sankaran, Banumathi; Hu, Liya; Prasad, B. V. Venkataram;

The Klebsiella pneumoniae carbapenemase-2 (KPC-2) is a common source of antibiotic resistance in Gram-negative bacterial infections. KPC-2 is a class A β-lactamase that exhibits a broad substrate profile and hydrolyzes most β-lactam antibiotics including carbapenems owing to rapid deacylation of the covalent acyl-enzyme intermediate. However, the features that allow KPC-2 to deacylate substrates more rapidly than non-carbapenemase enzymes are not clear. The active-site residues in KPC-2 are largely conserved in sequence and structure compared with non-carbapenemases, suggesting that subtle alterations may collectively facilitate hydrolysis of carbapenems. We utilized a nonbiased genetic approach to identify mutants deficient in carbapenem hydrolysis but competent for ampicillin hydrolysis. Subsequent pre–steady-state enzyme kinetics analyses showed that the substitutions slow the rate of deacylation of carbapenems. Structure determination via X-ray diffraction indicated that a F72Y mutant forms a hydrogen bond between the tyrosine hydroxyl group and Glu166, which may lower basicity and impair the activation of the catalytic water for deacylation, whereas several mutants impact the structure of the Q214-R220 active site loop. A T215P substitution lowers the deacylation rate and drastically alters the conformation of the loop, thereby disrupting interactions between the enzyme and the carbapenem acyl-enzyme intermediate. Thus, the environment of the Glu166 general base and the precise placement and conformational stability of the Q214-R220 loop are critical for efficient deacylation of carbapenems by the KPC-2 enzyme. Therefore, the design of carbapenem antibiotics that interact with Glu166 or alter the Q214-R220 loop conformation may disrupt enzyme function and overcome resistance.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1785783

Alternate ID(s):: OSTI ID: 1815744

Journal Information:: Journal of Biological Chemistry, Journal Name: Journal of Biological Chemistry Vol. 296 Journal Issue: C; ISSN 0021-9258

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

59 BASIC BIOLOGICAL SCIENCES
beta-lactamase
carbapenemase
antibiotics
antibiotic resistance
carbapenems
enzyme
enzyme structure
enzyme kinetics
CRE
carbapenem-resistant Enterobacteriaceae
KPC-2
Klebsiella pneumoniae carbapenemase-2
MIC
minimum inhibitory concentration

Title: Local interactions with the Glu166 base and the conformation of an active site loop play key roles in carbapenem hydrolysis by the KPC-2 β-lactamase

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