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Title: Structural and biochemical characterization of AidC, a quorum-quenching lactonase with atypical selectivity

Journal Article · · Biochemistry
 [1];  [2];  [3];  [4];  [3];  [5];  [6]
  1. Loyola Univ. Chicago, Chicago, IL (United States). Dept. of Chemistry and Biochemistry
  2. Univ. of Texas, Austin, TX (United States). College of Pharmacy
  3. Indiana Univ. School of Medicine, Indianapolis, IN (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Loyola Univ. Chicago, Chicago, IL (United States). Dept. of Chemistry and Biochemistry
  6. Univ. of Texas, Austin, TX (United States). College of Pharmacy; Univ. of Texas, Austin, TX (United States). Center for Infectious Disease

Quorum-quenching catalysts are of interest for potential application as biochemical tools for interrogating interbacterial communication pathways, as antibiofouling agents, and as anti-infective agents in plants and animals. Herein, the structure and function of AidC, an N-acyl-l-homoserine lactone (AHL) lactonase from Chryseobacterium, is characterized. Steady-state kinetics show that zinc-supplemented AidC is the most efficient wild-type quorum-quenching enzymes characterized to date, with a kcat/KM value of approximately 2 × 106 M-1 s-1 for N-heptanoyl-l-homoserine lactone. The enzyme has stricter substrate selectivity and significantly lower KM values (ca. 50 μM for preferred substrates) compared to those of typical AHL lactonases (ca. >1 mM). X-ray crystal structures of AidC alone and with the product N-hexanoyl-l-homoserine were determined at resolutions of 1.09 and 1.67 Å, respectively. Each structure displays as a dimer, and dimeric oligiomerization was also observed in solution by size-exclusion chromatography coupled with multiangle light scattering. Lastly, the structures reveal two atypical features as compared to previously characterized AHL lactonases: a "kinked" α-helix that forms part of a closed binding pocket that provides affinity and enforces selectivity for AHL substrates and an active-site His substitution that is usually found in a homologous family of phosphodiesterases. We discuss implications for the catalytic mechanism of AHL lactonases.

Research Organization:
Office of Scientific and Technical Information, Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
F-1572; GM111639; CHE-1308672
OSTI ID:
1263637
Journal Information:
Biochemistry, Vol. 54, Issue 28; ISSN 0006-2960
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (8)

Catalytic Characteristics of New Antibacterials Based on Hexahistidine-Containing Organophosphorus Hydrolase journal September 2017
The Structural Determinants Accounting for the Broad Substrate Specificity of the Quorum Quenching Lactonase GcL journal May 2019
Structural and Biochemical Characterization of AaL, a Quorum Quenching Lactonase with Unusual Kinetic Properties journal July 2018
Characterization of AiiK, an AHL lactonase, from Kurthia huakui LAM0618T and its application in quorum quenching on Pseudomonas aeruginosa PAO1 journal April 2018
Engineering of a thermostable esterase Est816 to improve its quorum-quenching activity and the underlying structural basis journal December 2016
AidP, a novel N-Acyl homoserine lactonase gene from Antarctic Planococcus sp. journal February 2017
Signal Disruption Leads to Changes in Bacterial Community Population journal March 2019
Effects of Signal Disruption Depends on the Substrate Preference of the Lactonase journal January 2020