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Dynamics of MutS–Mismatched DNA Complexes Are Predictive of Their Repair Phenotypes
[Image: see text] MutS recognizes base–base mismatches and base insertions/deletions (IDLs) in newly replicated DNA. Specific interactions between MutS and these errors trigger a cascade of protein–protein interactions that ultimately lead to their repair. The inability to explain why different DNA...
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/PMC3985873/ https://www.ncbi.nlm.nih.gov/pubmed/24588663 http://dx.doi.org/10.1021/bi401429b |
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author | DeRocco, Vanessa C. Sass, Lauryn E. Qiu, Ruoyi Weninger, Keith R. Erie, Dorothy A. |
author_facet | DeRocco, Vanessa C. Sass, Lauryn E. Qiu, Ruoyi Weninger, Keith R. Erie, Dorothy A. |
author_sort | DeRocco, Vanessa C. |
collection | PubMed |
description | [Image: see text] MutS recognizes base–base mismatches and base insertions/deletions (IDLs) in newly replicated DNA. Specific interactions between MutS and these errors trigger a cascade of protein–protein interactions that ultimately lead to their repair. The inability to explain why different DNA errors are repaired with widely varying efficiencies in vivo remains an outstanding example of our limited knowledge of this process. Here, we present single-molecule Förster resonance energy transfer measurements of the DNA bending dynamics induced by Thermus aquaticus MutS and the E41A mutant of MutS, which is known to have error specific deficiencies in signaling repair. We compared three DNA mismatches/IDLs (T-bulge, GT, and CC) with repair efficiencies ranging from high to low. We identify three dominant DNA bending states [slightly bent/unbent (U), intermediately bent (I), and significantly bent (B)] and find that the kinetics of interconverting among states varies widely for different complexes. The increased stability of MutS–mismatch/IDL complexes is associated with stabilization of U and lowering of the B to U transition barrier. Destabilization of U is always accompanied by a destabilization of B, supporting the suggestion that B is a “required” precursor to U. Comparison of MutS and MutS-E41A dynamics on GT and the T-bulge suggests that hydrogen bonding to MutS facilitates the changes in base–base hydrogen bonding that are required to achieve the U state, which has been implicated in repair signaling. Taken together with repair propensities, our data suggest that the bending kinetics of MutS–mismatched DNA complexes may control the entry into functional pathways for downstream signaling of repair. |
format | Online Article Text |
id | pubmed-3985873 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | American
Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-39858732015-03-04 Dynamics of MutS–Mismatched DNA Complexes Are Predictive of Their Repair Phenotypes DeRocco, Vanessa C. Sass, Lauryn E. Qiu, Ruoyi Weninger, Keith R. Erie, Dorothy A. Biochemistry [Image: see text] MutS recognizes base–base mismatches and base insertions/deletions (IDLs) in newly replicated DNA. Specific interactions between MutS and these errors trigger a cascade of protein–protein interactions that ultimately lead to their repair. The inability to explain why different DNA errors are repaired with widely varying efficiencies in vivo remains an outstanding example of our limited knowledge of this process. Here, we present single-molecule Förster resonance energy transfer measurements of the DNA bending dynamics induced by Thermus aquaticus MutS and the E41A mutant of MutS, which is known to have error specific deficiencies in signaling repair. We compared three DNA mismatches/IDLs (T-bulge, GT, and CC) with repair efficiencies ranging from high to low. We identify three dominant DNA bending states [slightly bent/unbent (U), intermediately bent (I), and significantly bent (B)] and find that the kinetics of interconverting among states varies widely for different complexes. The increased stability of MutS–mismatch/IDL complexes is associated with stabilization of U and lowering of the B to U transition barrier. Destabilization of U is always accompanied by a destabilization of B, supporting the suggestion that B is a “required” precursor to U. Comparison of MutS and MutS-E41A dynamics on GT and the T-bulge suggests that hydrogen bonding to MutS facilitates the changes in base–base hydrogen bonding that are required to achieve the U state, which has been implicated in repair signaling. Taken together with repair propensities, our data suggest that the bending kinetics of MutS–mismatched DNA complexes may control the entry into functional pathways for downstream signaling of repair. American Chemical Society 2014-03-04 2014-04-01 /pmc/articles/PMC3985873/ /pubmed/24588663 http://dx.doi.org/10.1021/bi401429b Text en Copyright © 2014 American Chemical Society |
spellingShingle | DeRocco, Vanessa C. Sass, Lauryn E. Qiu, Ruoyi Weninger, Keith R. Erie, Dorothy A. Dynamics of MutS–Mismatched DNA Complexes Are Predictive of Their Repair Phenotypes |
title | Dynamics of MutS–Mismatched DNA Complexes Are
Predictive of Their Repair Phenotypes |
title_full | Dynamics of MutS–Mismatched DNA Complexes Are
Predictive of Their Repair Phenotypes |
title_fullStr | Dynamics of MutS–Mismatched DNA Complexes Are
Predictive of Their Repair Phenotypes |
title_full_unstemmed | Dynamics of MutS–Mismatched DNA Complexes Are
Predictive of Their Repair Phenotypes |
title_short | Dynamics of MutS–Mismatched DNA Complexes Are
Predictive of Their Repair Phenotypes |
title_sort | dynamics of muts–mismatched dna complexes are
predictive of their repair phenotypes |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3985873/ https://www.ncbi.nlm.nih.gov/pubmed/24588663 http://dx.doi.org/10.1021/bi401429b |
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