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MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding

Mycobacterium tuberculosis, the bacterium responsible for human tuberculosis, has a genome encoding a remarkably high number of toxin-antitoxin systems of largely unknown function. We have recently shown that the M. tuberculosis genome encodes four of a widespread, MenAT family of nucleotidyltransfe...

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Autores principales: Xu, Xibing, Usher, Ben, Gutierrez, Claude, Barriot, Roland, Arrowsmith, Tom J., Han, Xue, Redder, Peter, Neyrolles, Olivier, Blower, Tim R., Genevaux, Pierre
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10435456/
https://www.ncbi.nlm.nih.gov/pubmed/37591829
http://dx.doi.org/10.1038/s41467-023-40264-3
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author Xu, Xibing
Usher, Ben
Gutierrez, Claude
Barriot, Roland
Arrowsmith, Tom J.
Han, Xue
Redder, Peter
Neyrolles, Olivier
Blower, Tim R.
Genevaux, Pierre
author_facet Xu, Xibing
Usher, Ben
Gutierrez, Claude
Barriot, Roland
Arrowsmith, Tom J.
Han, Xue
Redder, Peter
Neyrolles, Olivier
Blower, Tim R.
Genevaux, Pierre
author_sort Xu, Xibing
collection PubMed
description Mycobacterium tuberculosis, the bacterium responsible for human tuberculosis, has a genome encoding a remarkably high number of toxin-antitoxin systems of largely unknown function. We have recently shown that the M. tuberculosis genome encodes four of a widespread, MenAT family of nucleotidyltransferase toxin-antitoxin systems. In this study we characterize MenAT1, using tRNA sequencing to demonstrate MenT1 tRNA modification activity. MenT1 activity is blocked by MenA1, a short protein antitoxin unrelated to the MenA3 kinase. X-ray crystallographic analysis shows blockage of the conserved MenT fold by asymmetric binding of MenA1 across two MenT1 protomers, forming a heterotrimeric toxin-antitoxin complex. Finally, we also demonstrate tRNA modification by toxin MenT4, indicating conserved activity across the MenT family. Our study highlights variation in tRNA target preferences by MenT toxins, selective use of nucleotide substrates, and diverse modes of MenA antitoxin activity.
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spelling pubmed-104354562023-08-19 MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding Xu, Xibing Usher, Ben Gutierrez, Claude Barriot, Roland Arrowsmith, Tom J. Han, Xue Redder, Peter Neyrolles, Olivier Blower, Tim R. Genevaux, Pierre Nat Commun Article Mycobacterium tuberculosis, the bacterium responsible for human tuberculosis, has a genome encoding a remarkably high number of toxin-antitoxin systems of largely unknown function. We have recently shown that the M. tuberculosis genome encodes four of a widespread, MenAT family of nucleotidyltransferase toxin-antitoxin systems. In this study we characterize MenAT1, using tRNA sequencing to demonstrate MenT1 tRNA modification activity. MenT1 activity is blocked by MenA1, a short protein antitoxin unrelated to the MenA3 kinase. X-ray crystallographic analysis shows blockage of the conserved MenT fold by asymmetric binding of MenA1 across two MenT1 protomers, forming a heterotrimeric toxin-antitoxin complex. Finally, we also demonstrate tRNA modification by toxin MenT4, indicating conserved activity across the MenT family. Our study highlights variation in tRNA target preferences by MenT toxins, selective use of nucleotide substrates, and diverse modes of MenA antitoxin activity. Nature Publishing Group UK 2023-08-17 /pmc/articles/PMC10435456/ /pubmed/37591829 http://dx.doi.org/10.1038/s41467-023-40264-3 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Xu, Xibing
Usher, Ben
Gutierrez, Claude
Barriot, Roland
Arrowsmith, Tom J.
Han, Xue
Redder, Peter
Neyrolles, Olivier
Blower, Tim R.
Genevaux, Pierre
MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding
title MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding
title_full MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding
title_fullStr MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding
title_full_unstemmed MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding
title_short MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding
title_sort ment nucleotidyltransferase toxins extend trna acceptor stems and can be inhibited by asymmetrical antitoxin binding
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10435456/
https://www.ncbi.nlm.nih.gov/pubmed/37591829
http://dx.doi.org/10.1038/s41467-023-40264-3
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