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Mutation-Based Antibiotic Resistance Mechanism in Methicillin-Resistant Staphylococcus aureus Clinical Isolates

β-Lactam antibiotics target penicillin-binding proteins and inhibit the synthesis of peptidoglycan, a crucial step in cell wall biosynthesis. Staphylococcus aureus acquires resistance against β-lactam antibiotics by producing a penicillin-binding protein 2a (PBP2a), encoded by the mecA gene. PBP2a p...

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Autores principales: Ali, Tanveer, Basit, Abdul, Karim, Asad Mustafa, Lee, Jung-Hun, Jeon, Jeong-Ho, Rehman, Shafiq ur, Lee, Sang-Hee
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8147353/
https://www.ncbi.nlm.nih.gov/pubmed/34062812
http://dx.doi.org/10.3390/ph14050420
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author Ali, Tanveer
Basit, Abdul
Karim, Asad Mustafa
Lee, Jung-Hun
Jeon, Jeong-Ho
Rehman, Shafiq ur
Lee, Sang-Hee
author_facet Ali, Tanveer
Basit, Abdul
Karim, Asad Mustafa
Lee, Jung-Hun
Jeon, Jeong-Ho
Rehman, Shafiq ur
Lee, Sang-Hee
author_sort Ali, Tanveer
collection PubMed
description β-Lactam antibiotics target penicillin-binding proteins and inhibit the synthesis of peptidoglycan, a crucial step in cell wall biosynthesis. Staphylococcus aureus acquires resistance against β-lactam antibiotics by producing a penicillin-binding protein 2a (PBP2a), encoded by the mecA gene. PBP2a participates in peptidoglycan biosynthesis and exhibits a poor affinity towards β-lactam antibiotics. The current study was performed to determine the diversity and the role of missense mutations of PBP2a in the antibiotic resistance mechanism. The methicillin-resistant Staphylococcus aureus (MRSA) isolates from clinical samples were identified using phenotypic and genotypic techniques. The highest frequency (60%, 18 out of 30) of MRSA was observed in wound specimens. Sequence variation analysis of the mecA gene showed four amino acid substitutions (i.e., E239K, E239R, G246E, and E447K). The E239R mutation was found to be novel. The protein-ligand docking results showed that the E239R mutation in the allosteric site of PBP2a induces conformational changes in the active site and, thus, hinders its interaction with cefoxitin. Therefore, the present report indicates that mutation in the allosteric site of PBP2a provides a more closed active site conformation than wide-type PBP2a and then causes the high-level resistance to cefoxitin.
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spelling pubmed-81473532021-05-26 Mutation-Based Antibiotic Resistance Mechanism in Methicillin-Resistant Staphylococcus aureus Clinical Isolates Ali, Tanveer Basit, Abdul Karim, Asad Mustafa Lee, Jung-Hun Jeon, Jeong-Ho Rehman, Shafiq ur Lee, Sang-Hee Pharmaceuticals (Basel) Article β-Lactam antibiotics target penicillin-binding proteins and inhibit the synthesis of peptidoglycan, a crucial step in cell wall biosynthesis. Staphylococcus aureus acquires resistance against β-lactam antibiotics by producing a penicillin-binding protein 2a (PBP2a), encoded by the mecA gene. PBP2a participates in peptidoglycan biosynthesis and exhibits a poor affinity towards β-lactam antibiotics. The current study was performed to determine the diversity and the role of missense mutations of PBP2a in the antibiotic resistance mechanism. The methicillin-resistant Staphylococcus aureus (MRSA) isolates from clinical samples were identified using phenotypic and genotypic techniques. The highest frequency (60%, 18 out of 30) of MRSA was observed in wound specimens. Sequence variation analysis of the mecA gene showed four amino acid substitutions (i.e., E239K, E239R, G246E, and E447K). The E239R mutation was found to be novel. The protein-ligand docking results showed that the E239R mutation in the allosteric site of PBP2a induces conformational changes in the active site and, thus, hinders its interaction with cefoxitin. Therefore, the present report indicates that mutation in the allosteric site of PBP2a provides a more closed active site conformation than wide-type PBP2a and then causes the high-level resistance to cefoxitin. MDPI 2021-05-01 /pmc/articles/PMC8147353/ /pubmed/34062812 http://dx.doi.org/10.3390/ph14050420 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ali, Tanveer
Basit, Abdul
Karim, Asad Mustafa
Lee, Jung-Hun
Jeon, Jeong-Ho
Rehman, Shafiq ur
Lee, Sang-Hee
Mutation-Based Antibiotic Resistance Mechanism in Methicillin-Resistant Staphylococcus aureus Clinical Isolates
title Mutation-Based Antibiotic Resistance Mechanism in Methicillin-Resistant Staphylococcus aureus Clinical Isolates
title_full Mutation-Based Antibiotic Resistance Mechanism in Methicillin-Resistant Staphylococcus aureus Clinical Isolates
title_fullStr Mutation-Based Antibiotic Resistance Mechanism in Methicillin-Resistant Staphylococcus aureus Clinical Isolates
title_full_unstemmed Mutation-Based Antibiotic Resistance Mechanism in Methicillin-Resistant Staphylococcus aureus Clinical Isolates
title_short Mutation-Based Antibiotic Resistance Mechanism in Methicillin-Resistant Staphylococcus aureus Clinical Isolates
title_sort mutation-based antibiotic resistance mechanism in methicillin-resistant staphylococcus aureus clinical isolates
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8147353/
https://www.ncbi.nlm.nih.gov/pubmed/34062812
http://dx.doi.org/10.3390/ph14050420
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