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Evidence that the nadA motif is a bacterial riboswitch for the ubiquitous enzyme cofactor NAD(+)

The nadA motif is a riboswitch candidate present in various Acidobacteria species that was previously identified by bioinformatic analysis of bacterial DNA data sets. More than 100 unique representatives have been identified exclusively upstream of nadA genes, which code for an enzyme in the biosynt...

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Detalles Bibliográficos
Autores principales: Malkowski, Sarah N., Spencer, Tara C.J., Breaker, Ronald R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Cold Spring Harbor Laboratory Press 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6859854/
https://www.ncbi.nlm.nih.gov/pubmed/31467147
http://dx.doi.org/10.1261/rna.072538.119
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author Malkowski, Sarah N.
Spencer, Tara C.J.
Breaker, Ronald R.
author_facet Malkowski, Sarah N.
Spencer, Tara C.J.
Breaker, Ronald R.
author_sort Malkowski, Sarah N.
collection PubMed
description The nadA motif is a riboswitch candidate present in various Acidobacteria species that was previously identified by bioinformatic analysis of bacterial DNA data sets. More than 100 unique representatives have been identified exclusively upstream of nadA genes, which code for an enzyme in the biosynthetic pathway of the ubiquitous coenzyme NAD(+). The architecture of nadA motif RNAs suggests they use structurally similar tandem ligand-binding aptamer domains to control translation initiation. Biochemical analyses reveal that the first domain selectively binds ligands carrying an adenosine 5′-diphosphate (5′ ADP) moiety, including NAD(+) and its reduced form, NADH. Genetic analyses indicate that a tandem nadA motif RNA suppresses gene expression when NAD(+) is abundant, and that both aptamer domains are required for maximal gene regulation. However, we have not observed selective binding of the nicotinamide moiety of NAD(+) or binding by the second putative aptamer in vitro, despite sequence and structural similarities between the tandem domains.
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spelling pubmed-68598542019-12-04 Evidence that the nadA motif is a bacterial riboswitch for the ubiquitous enzyme cofactor NAD(+) Malkowski, Sarah N. Spencer, Tara C.J. Breaker, Ronald R. RNA Report The nadA motif is a riboswitch candidate present in various Acidobacteria species that was previously identified by bioinformatic analysis of bacterial DNA data sets. More than 100 unique representatives have been identified exclusively upstream of nadA genes, which code for an enzyme in the biosynthetic pathway of the ubiquitous coenzyme NAD(+). The architecture of nadA motif RNAs suggests they use structurally similar tandem ligand-binding aptamer domains to control translation initiation. Biochemical analyses reveal that the first domain selectively binds ligands carrying an adenosine 5′-diphosphate (5′ ADP) moiety, including NAD(+) and its reduced form, NADH. Genetic analyses indicate that a tandem nadA motif RNA suppresses gene expression when NAD(+) is abundant, and that both aptamer domains are required for maximal gene regulation. However, we have not observed selective binding of the nicotinamide moiety of NAD(+) or binding by the second putative aptamer in vitro, despite sequence and structural similarities between the tandem domains. Cold Spring Harbor Laboratory Press 2019-12 /pmc/articles/PMC6859854/ /pubmed/31467147 http://dx.doi.org/10.1261/rna.072538.119 Text en © 2019 Malkowski et al.; Published by Cold Spring Harbor Laboratory Press for the RNA Society http://creativecommons.org/licenses/by-nc/4.0/ This article, published in RNA, is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.
spellingShingle Report
Malkowski, Sarah N.
Spencer, Tara C.J.
Breaker, Ronald R.
Evidence that the nadA motif is a bacterial riboswitch for the ubiquitous enzyme cofactor NAD(+)
title Evidence that the nadA motif is a bacterial riboswitch for the ubiquitous enzyme cofactor NAD(+)
title_full Evidence that the nadA motif is a bacterial riboswitch for the ubiquitous enzyme cofactor NAD(+)
title_fullStr Evidence that the nadA motif is a bacterial riboswitch for the ubiquitous enzyme cofactor NAD(+)
title_full_unstemmed Evidence that the nadA motif is a bacterial riboswitch for the ubiquitous enzyme cofactor NAD(+)
title_short Evidence that the nadA motif is a bacterial riboswitch for the ubiquitous enzyme cofactor NAD(+)
title_sort evidence that the nada motif is a bacterial riboswitch for the ubiquitous enzyme cofactor nad(+)
topic Report
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6859854/
https://www.ncbi.nlm.nih.gov/pubmed/31467147
http://dx.doi.org/10.1261/rna.072538.119
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