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
Structure-activity relationships of biphenyl tetrazoles as metallo-β-lactamase inhibitors
Jeffrey H. Toney,Kelly A. Cleary,Gail G. Hammond,Xiling Yuan,Walter J. May,Steven M. Hutchins,Wallace T. Ashton,Dana E. Vanderwall +7 more
TL;DR: Biphenyl tetrazoles containing 3-n-butyl-1-phenylpyrazole-5-carboxylates or the corresponding 5-ethyl esters were found to inhibit metallo-β-lactamases as well as renal dehydropeptidase I to a lesser extent.
Journal ArticleDOI
Carboxypeptidase A: approaches to the chemical nature of the active center and the mechanisms of action.
TL;DR: Zinc appears to be displaced from the enzyme in proportion to the reaction of these reagents with the N-terminal asparagine and the sequence and magnitude of the stability constants of different metallocarboxypeptidases indicated early that the metal atom is also bound to nitrogen.
Journal ArticleDOI
Molecular dynamics simulations of the dinuclear zinc-β-lactamase from Bacteroides fragilis complexed with imipenem†
TL;DR: Results from MD simulations of the Michaelis complex formed between the dizinc β‐lactamase from B. fragilis and imipenem are presented, finding that the two configurations have similar energies, indicating that these two structures could readily be interchanged, thereby facilitating catalysis.
Journal ArticleDOI
Gene Mutations Responsible for Overexpression of AmpC β-Lactamase in Some Clinical Isolates of Enterobacter cloacae
TL;DR: AmpC regulatory genes in 21 ceftazidime-resistant clinical isolates of Enterobacter cloacae exhibited AmpC overproduction due to AmpD mutation and two AmpR mutants were found among the isolates, the first report of chromosomal ampR mutation in clinical isolate of E. cloACae.
Journal ArticleDOI
Genetic and Biochemical Characterization of a Novel Metallo-β-Lactamase, TMB-1, from an Achromobacter xylosoxidans Strain Isolated in Tripoli, Libya
Allaaeddin El Salabi,Pardha Saradhi Borra,Mark Toleman,Ørjan Samuelsen,Timothy R. Walsh,Timothy R. Walsh +5 more
TL;DR: An Achromobacter xylosoxidans strain from the Tripoli central hospital produced a unique metallo-β-lactamase, designated TMB-1, which is related to DIM-1 and GIM- 1, which was embedded in a class 1 integron and located on the chromosome.