Journal ArticleDOI
Metallo-β-lactamases in the Age of Multidrug Resistance: From Structure and Mechanism to Evolution, Dissemination, and Inhibitor Design.
TLDR
In this article, a review of the active site and catalytic mechanism of Metallo-β-lactamases (MBLs) is presented, and the success of MBLs in conferring resistance to carbapenems, penicillins, and cephalosporins.Abstract:
Antimicrobial resistance is one of the major problems in current practical medicine. The spread of genes coding for resistance determinants among bacteria challenges the use of approved antibiotics, narrowing the options for treatment. Resistance to carbapenems, last resort antibiotics, is a major concern. Metallo-β-lactamases (MBLs) hydrolyze carbapenems, penicillins, and cephalosporins, becoming central to this problem. These enzymes diverge with respect to serine-β-lactamases by exhibiting a different fold, active site, and catalytic features. Elucidating their catalytic mechanism has been a big challenge in the field that has limited the development of useful inhibitors. This review covers exhaustively the details of the active-site chemistries, the diversity of MBL alleles, the catalytic mechanism against different substrates, and how this information has helped developing inhibitors. We also discuss here different aspects critical to understand the success of MBLs in conferring resistance: the molecular determinants of their dissemination, their cell physiology, from the biogenesis to the processing involved in the transit to the periplasm, and the uptake of the Zn(II) ions upon metal starvation conditions, such as those encountered during an infection. In this regard, the chemical, biochemical and microbiological aspects provide an integrative view of the current knowledge of MBLs.read more
Citations
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Journal ArticleDOI
β-Lactam antibiotic targets and resistance mechanisms: from covalent inhibitors to substrates.
TL;DR: This tutorial-style review of the β-lactam antibiotics provides an overview of their covalent interactions with their target proteins and resistance mechanisms, and introduces the l,d-transpeptidases, a group of bacterial enzymes involved in peptidoglycan synthesis which are also targeted by β- lactams.
Journal ArticleDOI
Metallo-β-lactamases and a tug-of-war for the available zinc at the host–pathogen interface
TL;DR: Metallo-β-lactamases (MBLs) are zinc-dependent hydrolases that inactivate virtually all β lactam antibiotics as discussed by the authors , and metal starvation is a driving force acting on MBL evolution.
Journal ArticleDOI
1,2,4-Triazole-3-thione compounds with a 4-ethyl alkyl/aryl sulfide substituent are broad-spectrum metallo-β-lactamase inhibitors with re-sensitization activity.
Alice Legru,Federica Verdirosa,Jean-François Hernandez,G. Tassone,Filomena Sannio,Manuela Benvenuti,Pierre-Alexis Conde,Guillaume Bossis,Caitlyn A. Thomas,Michael W. Crowder,Melissa Dillenberger,Katja Becker,Cecilia Pozzi,Stefano Mangani,Jean Denis Docquier,Jean Denis Docquier,Laurent Gavara +16 more
TL;DR: In this paper, the potential of compounds based on the 1,2,4-triazole-3-thione scaffold as an original ligand of the di-zinc active sites of MBLs was explored.
Journal ArticleDOI
Deciphering the evolution of metallo-β-lactamases: a journey from the test tube to the bacterial periplasm.
TL;DR: In this paper , the evolutionary traits acquired by different clinical variants of MBLs in conditions mimicking their native environment (the bacterial periplasm) and considering whether they are soluble or membrane-bound proteins are discussed.
Journal ArticleDOI
Antimicrobial Activity of Aztreonam in Combination with Old and New β-Lactamase Inhibitors against MBL and ESBL Co-Producing Gram-Negative Clinical Isolates: Possible Options for the Treatment of Complicated Infections
Gianluca Morroni,Raffaela Bressan,Simona Fioriti,Gloria D’Achille,Marina Mingoia,Oscar Cirioni,Stefano Di Bella,Aurora Piazza,Francesco Comandatore,Carola Mauri,Roberta Migliavacca,Francesco Luzzaro,Luigi Principe,Cristina Lagatolla +13 more
TL;DR: In this paper, the authors assessed the activity of the combination of Aztreonam (ATM) with old and new β-lactamases inhibitors (BLIs) against MBL and ESBL co-producing Gram-negative clinical isolates.
References
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Journal ArticleDOI
Function of the Outer Membrane of Escherichia coli as a Permeability Barrier to Beta-Lactam Antibiotics
Willy Zimmermann,A. Rosselet +1 more
TL;DR: The cell envelope was found to act as a diffusion barrier to both penicillins and cephalosporins, and the cooperative action of cell-bound β-lactamase and outer membrane showed good correspondence at five different antibiotic concentrations.
Journal ArticleDOI
Oxidative metal release from metallothionein via zinc-thiol/disulfide interchange
TL;DR: A rapid radiochromatographic method is designed that can detect changes in the zinc content of 65Zn-labeled metallothionein in response to other biomolecules and establishes that rabbit liver metallothsionein 2 interacts with glutathione disulfide with concomitant release of zinc.
Journal ArticleDOI
The crystal structure of the L1 metallo-beta-lactamase from Stenotrophomonas maltophilia at 1.7 A resolution.
Jakir Hussain Ullah,Timothy R. Walsh,Timothy R. Walsh,Ian A. Taylor,D.C. Emery,Chandra S. Verma,Steven J. Gamblin,J. Spencer +7 more
TL;DR: A catalytic mechanism whose principal features are a nucleophilic attack of the bridging water on the beta-lactam carbonyl carbon, electrostatic stabilisation of a negatively charged tetrahedral transition state and protonation of the Beta-lactoram nitrogen by a second water molecule co-ordinated by Zn2 is described.
Journal ArticleDOI
Beta-lactamase database (BLDB) – structure and function
Thierry Naas,Saoussen Oueslati,Rémy A. Bonnin,Maria Laura Dabos,Agustin Zavala,Laurent Dortet,Pascal Retailleau,Bogdan I. Iorga +7 more
TL;DR: The characterisation of representative mutants and hydrolytic profiles (kinetics) completes the picture and altogether these four elements constitute the essential foundation for a better understanding of the structure-function relationship within this enzymes family.
Journal ArticleDOI
An Iron-binding Component in Human Blood Plasma.
Arthur L. Schade,Leona Caroline +1 more
TL;DR: Communications relative to membership In the Association and to all matters of business of the Association should be Communications relative to articles offered for publication addressed to the Administrative Secretary, AAAS, 1515 Masshould be addressed to Editor, 15 15 Massachusetts Avenue, sachusetts Avenue, N. C.W.