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Type M Resistance to Macrolides Is Due to a Two-Gene Efflux Transport System of the ATP-Binding Cassette (ABC) Superfamily
The mef(A) gene was originally identified as the resistance determinant responsible for type M resistance to macrolides, a phenotype frequently found in clinical isolates of Streptococcus pneumoniae and Streptococcus pyogenes. MefA was defined as a secondary transporter of the major facilitator supe...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Frontiers Media S.A.
2018
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6079230/ https://www.ncbi.nlm.nih.gov/pubmed/30108557 http://dx.doi.org/10.3389/fmicb.2018.01670 |
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author | Iannelli, Francesco Santoro, Francesco Santagati, Maria Docquier, Jean-Denis Lazzeri, Elisa Pastore, Gabiria Cassone, Marco Oggioni, Marco R. Rossolini, Gian M. Stefani, Stefania Pozzi, Gianni |
author_facet | Iannelli, Francesco Santoro, Francesco Santagati, Maria Docquier, Jean-Denis Lazzeri, Elisa Pastore, Gabiria Cassone, Marco Oggioni, Marco R. Rossolini, Gian M. Stefani, Stefania Pozzi, Gianni |
author_sort | Iannelli, Francesco |
collection | PubMed |
description | The mef(A) gene was originally identified as the resistance determinant responsible for type M resistance to macrolides, a phenotype frequently found in clinical isolates of Streptococcus pneumoniae and Streptococcus pyogenes. MefA was defined as a secondary transporter of the major facilitator superfamily driven by proton-motive force. However, when characterizing the mef(A)-carrying elements Tn1207.1 and Φ1207.3, another macrolide resistance gene, msr(D), was found adjacent to mef(A). To define the respective contribution of mef(A) and msr(D) to macrolide resistance, three isogenic deletion mutants were constructed by transformation of a S. pneumoniae strain carrying Φ1207.3: (i) Δmef(A)–Δmsr(D); (ii) Δmef(A)–msr(D); and (iii) mef(A)–Δmsr(D). Susceptibility testing of mutants clearly showed that msr(D) is required for macrolide resistance, while deletion of mef(A) produced only a twofold reduction in the minimal inhibitory concentration (MIC) for erythromycin. The contribution of msr(D) to macrolide resistance was also studied in S. pyogenes, which is the original host of Φ1207.3. Two isogenic strains of S. pyogenes were constructed: (i) FR156, carrying Φ1207.3, and (ii) FR155, carrying Φ1207.3/Δmsr(D). FR155 was susceptible to erythromycin, whereas FR156 was resistant, with an MIC value of 8 μg/ml. Complementation experiments showed that reintroduction of the msr(D) gene could restore macrolide resistance in Δmsr(D) mutants. Radiolabeled erythromycin was retained by strains lacking msr(D), while msr(D)-carrying strains showed erythromycin efflux. Deletion of mef(A) did not affect erythromycin efflux. This data suggest that type M resistance to macrolides in streptococci is due to an efflux transport system of the ATP-binding cassette (ABC) superfamily, in which mef(A) encodes the transmembrane channel, and msr(D) the two ATP-binding domains. |
format | Online Article Text |
id | pubmed-6079230 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-60792302018-08-14 Type M Resistance to Macrolides Is Due to a Two-Gene Efflux Transport System of the ATP-Binding Cassette (ABC) Superfamily Iannelli, Francesco Santoro, Francesco Santagati, Maria Docquier, Jean-Denis Lazzeri, Elisa Pastore, Gabiria Cassone, Marco Oggioni, Marco R. Rossolini, Gian M. Stefani, Stefania Pozzi, Gianni Front Microbiol Microbiology The mef(A) gene was originally identified as the resistance determinant responsible for type M resistance to macrolides, a phenotype frequently found in clinical isolates of Streptococcus pneumoniae and Streptococcus pyogenes. MefA was defined as a secondary transporter of the major facilitator superfamily driven by proton-motive force. However, when characterizing the mef(A)-carrying elements Tn1207.1 and Φ1207.3, another macrolide resistance gene, msr(D), was found adjacent to mef(A). To define the respective contribution of mef(A) and msr(D) to macrolide resistance, three isogenic deletion mutants were constructed by transformation of a S. pneumoniae strain carrying Φ1207.3: (i) Δmef(A)–Δmsr(D); (ii) Δmef(A)–msr(D); and (iii) mef(A)–Δmsr(D). Susceptibility testing of mutants clearly showed that msr(D) is required for macrolide resistance, while deletion of mef(A) produced only a twofold reduction in the minimal inhibitory concentration (MIC) for erythromycin. The contribution of msr(D) to macrolide resistance was also studied in S. pyogenes, which is the original host of Φ1207.3. Two isogenic strains of S. pyogenes were constructed: (i) FR156, carrying Φ1207.3, and (ii) FR155, carrying Φ1207.3/Δmsr(D). FR155 was susceptible to erythromycin, whereas FR156 was resistant, with an MIC value of 8 μg/ml. Complementation experiments showed that reintroduction of the msr(D) gene could restore macrolide resistance in Δmsr(D) mutants. Radiolabeled erythromycin was retained by strains lacking msr(D), while msr(D)-carrying strains showed erythromycin efflux. Deletion of mef(A) did not affect erythromycin efflux. This data suggest that type M resistance to macrolides in streptococci is due to an efflux transport system of the ATP-binding cassette (ABC) superfamily, in which mef(A) encodes the transmembrane channel, and msr(D) the two ATP-binding domains. Frontiers Media S.A. 2018-07-31 /pmc/articles/PMC6079230/ /pubmed/30108557 http://dx.doi.org/10.3389/fmicb.2018.01670 Text en Copyright © 2018 Iannelli, Santoro, Santagati, Docquier, Lazzeri, Pastore, Cassone, Oggioni, Rossolini, Stefani and Pozzi. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Microbiology Iannelli, Francesco Santoro, Francesco Santagati, Maria Docquier, Jean-Denis Lazzeri, Elisa Pastore, Gabiria Cassone, Marco Oggioni, Marco R. Rossolini, Gian M. Stefani, Stefania Pozzi, Gianni Type M Resistance to Macrolides Is Due to a Two-Gene Efflux Transport System of the ATP-Binding Cassette (ABC) Superfamily |
title | Type M Resistance to Macrolides Is Due to a Two-Gene Efflux Transport System of the ATP-Binding Cassette (ABC) Superfamily |
title_full | Type M Resistance to Macrolides Is Due to a Two-Gene Efflux Transport System of the ATP-Binding Cassette (ABC) Superfamily |
title_fullStr | Type M Resistance to Macrolides Is Due to a Two-Gene Efflux Transport System of the ATP-Binding Cassette (ABC) Superfamily |
title_full_unstemmed | Type M Resistance to Macrolides Is Due to a Two-Gene Efflux Transport System of the ATP-Binding Cassette (ABC) Superfamily |
title_short | Type M Resistance to Macrolides Is Due to a Two-Gene Efflux Transport System of the ATP-Binding Cassette (ABC) Superfamily |
title_sort | type m resistance to macrolides is due to a two-gene efflux transport system of the atp-binding cassette (abc) superfamily |
topic | Microbiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6079230/ https://www.ncbi.nlm.nih.gov/pubmed/30108557 http://dx.doi.org/10.3389/fmicb.2018.01670 |
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