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Biochemical and Structural Characterization of OXA-405, an OXA-48 Variant with Extended-Spectrum β-Lactamase Activity

OXA-48-producing Enterobacterales have now widely disseminated globally. A sign of their extensive spread is the identification of an increasing number of OXA-48 variants. Among them, three are particularly interesting, OXA-163, OXA-247 and OXA-405, since they have lost carbapenem activities and gai...

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Autores principales: Oueslati, Saoussen, Retailleau, Pascal, Marchini, Ludovic, Dortet, Laurent, Bonnin, Rémy A., Iorga, Bogdan I., Naas, Thierry
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7022249/
https://www.ncbi.nlm.nih.gov/pubmed/31877796
http://dx.doi.org/10.3390/microorganisms8010024
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author Oueslati, Saoussen
Retailleau, Pascal
Marchini, Ludovic
Dortet, Laurent
Bonnin, Rémy A.
Iorga, Bogdan I.
Naas, Thierry
author_facet Oueslati, Saoussen
Retailleau, Pascal
Marchini, Ludovic
Dortet, Laurent
Bonnin, Rémy A.
Iorga, Bogdan I.
Naas, Thierry
author_sort Oueslati, Saoussen
collection PubMed
description OXA-48-producing Enterobacterales have now widely disseminated globally. A sign of their extensive spread is the identification of an increasing number of OXA-48 variants. Among them, three are particularly interesting, OXA-163, OXA-247 and OXA-405, since they have lost carbapenem activities and gained expanded-spectrum cephalosporin hydrolytic activity subsequent to a four amino-acid (AA) deletion in the β5–β6 loop. We investigated the mechanisms responsible for substrate specificity of OXA-405. Kinetic parameters confirmed that OXA-405 has a hydrolytic profile compatible with an ESBL (hydrolysis of expanded spectrum cephalosporins and susceptibility to class A inhibitors). Molecular modeling techniques and 3D structure determination show that the overall dimeric structure of OXA-405 is very similar to that of OXA-48, except for the β5–β6 loop, which is shorter for OXA-405, suggesting that the length of the β5–β6 loop is critical for substrate specificity. Covalent docking with selected substrates and molecular dynamics simulations evidenced the structural changes induced by substrate binding, as well as the distribution of water molecules in the active site and their role in substrate hydrolysis. All this data may represent the structural basis for the design of new and efficient class D inhibitors.
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spelling pubmed-70222492020-03-09 Biochemical and Structural Characterization of OXA-405, an OXA-48 Variant with Extended-Spectrum β-Lactamase Activity Oueslati, Saoussen Retailleau, Pascal Marchini, Ludovic Dortet, Laurent Bonnin, Rémy A. Iorga, Bogdan I. Naas, Thierry Microorganisms Article OXA-48-producing Enterobacterales have now widely disseminated globally. A sign of their extensive spread is the identification of an increasing number of OXA-48 variants. Among them, three are particularly interesting, OXA-163, OXA-247 and OXA-405, since they have lost carbapenem activities and gained expanded-spectrum cephalosporin hydrolytic activity subsequent to a four amino-acid (AA) deletion in the β5–β6 loop. We investigated the mechanisms responsible for substrate specificity of OXA-405. Kinetic parameters confirmed that OXA-405 has a hydrolytic profile compatible with an ESBL (hydrolysis of expanded spectrum cephalosporins and susceptibility to class A inhibitors). Molecular modeling techniques and 3D structure determination show that the overall dimeric structure of OXA-405 is very similar to that of OXA-48, except for the β5–β6 loop, which is shorter for OXA-405, suggesting that the length of the β5–β6 loop is critical for substrate specificity. Covalent docking with selected substrates and molecular dynamics simulations evidenced the structural changes induced by substrate binding, as well as the distribution of water molecules in the active site and their role in substrate hydrolysis. All this data may represent the structural basis for the design of new and efficient class D inhibitors. MDPI 2019-12-21 /pmc/articles/PMC7022249/ /pubmed/31877796 http://dx.doi.org/10.3390/microorganisms8010024 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Oueslati, Saoussen
Retailleau, Pascal
Marchini, Ludovic
Dortet, Laurent
Bonnin, Rémy A.
Iorga, Bogdan I.
Naas, Thierry
Biochemical and Structural Characterization of OXA-405, an OXA-48 Variant with Extended-Spectrum β-Lactamase Activity
title Biochemical and Structural Characterization of OXA-405, an OXA-48 Variant with Extended-Spectrum β-Lactamase Activity
title_full Biochemical and Structural Characterization of OXA-405, an OXA-48 Variant with Extended-Spectrum β-Lactamase Activity
title_fullStr Biochemical and Structural Characterization of OXA-405, an OXA-48 Variant with Extended-Spectrum β-Lactamase Activity
title_full_unstemmed Biochemical and Structural Characterization of OXA-405, an OXA-48 Variant with Extended-Spectrum β-Lactamase Activity
title_short Biochemical and Structural Characterization of OXA-405, an OXA-48 Variant with Extended-Spectrum β-Lactamase Activity
title_sort biochemical and structural characterization of oxa-405, an oxa-48 variant with extended-spectrum β-lactamase activity
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7022249/
https://www.ncbi.nlm.nih.gov/pubmed/31877796
http://dx.doi.org/10.3390/microorganisms8010024
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