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
Early Dissemination of NDM-1- and OXA-181-Producing Enterobacteriaceae in Indian Hospitals: Report from the SENTRY Antimicrobial Surveillance Program, 2006-2007
Mariana Castanheira,Lalitagauri M. Deshpande,Dilip Mathai,Jan M. Bell,Ronald N. Jones,Rodrigo E. Mendes +5 more
TL;DR: Among 39 carbapenem-resistant Enterobacteriaceae isolated in 2006 and 2007 in India, 15 strains carried bla NDM-1 and 10 harbored a gene encoding a variant of the carbapENemase OXA-48, named bla OXa-181, which was disseminated in Indian health care facilities as early as 2006.
Journal ArticleDOI
Epidemiology of β-Lactamase-Producing Pathogens.
Karen Bush,Patricia A. Bradford +1 more
TL;DR: As selective pressure from β-lactam use continues, multiple β-Lactamases per organism are increasingly common, including pathogens carrying three different carbapenemase genes, warranting close attention to increased infection control measures and stewardship of the β- lactam-containing drugs in an effort to control selection of even more deleterious pathogens.
Journal ArticleDOI
Molecular characterization of SPM-1, a novel metallo-β-lactamase isolated in Latin America: report from the SENTRY antimicrobial surveillance programme
Mark Toleman,Alan M. Simm,Tanya A. Murphy,Ana Cristina Gales,Doug Biedenbach,Ronald N. Jones,Timothy R. Walsh +6 more
TL;DR: SPM-1 is a distinctly different metallo-beta-lactamase from VIM and IMP and, accordingly, represents a new subfamily of mobile metallo,beta, and lactamases, and possesses a unique loop of 23 residues that accounts for the higher molecular mass.
Journal ArticleDOI
Genetic Features of blaNDM-1-Positive Enterobacteriaceae
TL;DR: The blaNDM-1 gene was carried by different plasmid types (IncA/C, IncF, IncL/M, or untypeable) and was likely chromosome borne in two isolates and coharbored a variety of resistance determinants, including β-lactamase genes, quinolone resistance genes, and 16S RNA methylase genes.
Journal ArticleDOI
NDM Metallo-β-Lactamases and Their Bacterial Producers in Health Care Settings.
TL;DR: New Delhi metallo-β-lactamase will remain a severe challenge in health care settings, and more studies on appropriate countermeasures are required, as commonly used phenotypic tests cannot specifically identify NDM.