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Linkage and Allostery in snRNP Protein/RNA Complexes
[Image: see text] Drosophila SNF is a member of the U1A/U2B″/SNF protein family that is found in U1 and U2 snRNPs, where it binds to Stemloop II and Stemloop IV of U1 and U2 snRNA, respectively. SNF also binds to the U2A′ protein, but only in the U2 snRNP. Although previous reports have implicated U...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American
Chemical Society
2014
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4059526/ https://www.ncbi.nlm.nih.gov/pubmed/24849693 http://dx.doi.org/10.1021/bi500192a |
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author | Williams, Sandra G. Hall, Kathleen B. |
author_facet | Williams, Sandra G. Hall, Kathleen B. |
author_sort | Williams, Sandra G. |
collection | PubMed |
description | [Image: see text] Drosophila SNF is a member of the U1A/U2B″/SNF protein family that is found in U1 and U2 snRNPs, where it binds to Stemloop II and Stemloop IV of U1 and U2 snRNA, respectively. SNF also binds to the U2A′ protein, but only in the U2 snRNP. Although previous reports have implicated U2A′ as a necessary auxiliary protein for the binding of SNF to Stemloop IV, there are no mechanisms that explain the partitioning of U2A′ to the U2 snRNP and its absence from the U1 snRNP. Using in vitro RNA binding isotherms and isothermal titration calorimetry, the thermodynamics of SNF/RNA/U2A′ ternary complex formation have now been characterized. There is a very large binding cooperativity unique to Stemloop IV that favors formation of the SLIV/SNF/U2A′ complex. The binding cooperativity, or heterotropic linkage, is interpreted with respect to linked conformational equilibria of both SNF and its RNA ligand and so represents an example of protein–RNA allostery. |
format | Online Article Text |
id | pubmed-4059526 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | American
Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-40595262015-05-21 Linkage and Allostery in snRNP Protein/RNA Complexes Williams, Sandra G. Hall, Kathleen B. Biochemistry [Image: see text] Drosophila SNF is a member of the U1A/U2B″/SNF protein family that is found in U1 and U2 snRNPs, where it binds to Stemloop II and Stemloop IV of U1 and U2 snRNA, respectively. SNF also binds to the U2A′ protein, but only in the U2 snRNP. Although previous reports have implicated U2A′ as a necessary auxiliary protein for the binding of SNF to Stemloop IV, there are no mechanisms that explain the partitioning of U2A′ to the U2 snRNP and its absence from the U1 snRNP. Using in vitro RNA binding isotherms and isothermal titration calorimetry, the thermodynamics of SNF/RNA/U2A′ ternary complex formation have now been characterized. There is a very large binding cooperativity unique to Stemloop IV that favors formation of the SLIV/SNF/U2A′ complex. The binding cooperativity, or heterotropic linkage, is interpreted with respect to linked conformational equilibria of both SNF and its RNA ligand and so represents an example of protein–RNA allostery. American Chemical Society 2014-05-21 2014-06-10 /pmc/articles/PMC4059526/ /pubmed/24849693 http://dx.doi.org/10.1021/bi500192a Text en Copyright © 2014 American Chemical Society |
spellingShingle | Williams, Sandra G. Hall, Kathleen B. Linkage and Allostery in snRNP Protein/RNA Complexes |
title | Linkage and Allostery in snRNP Protein/RNA Complexes |
title_full | Linkage and Allostery in snRNP Protein/RNA Complexes |
title_fullStr | Linkage and Allostery in snRNP Protein/RNA Complexes |
title_full_unstemmed | Linkage and Allostery in snRNP Protein/RNA Complexes |
title_short | Linkage and Allostery in snRNP Protein/RNA Complexes |
title_sort | linkage and allostery in snrnp protein/rna complexes |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4059526/ https://www.ncbi.nlm.nih.gov/pubmed/24849693 http://dx.doi.org/10.1021/bi500192a |
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