Circular dichroism spectra and electrophoretic mobility shift assays show that human replication protein A binds and melts intramolecular G-quadruplex structures.
Identifieur interne : 000666 ( Ncbi/Checkpoint ); précédent : 000665; suivant : 000667Circular dichroism spectra and electrophoretic mobility shift assays show that human replication protein A binds and melts intramolecular G-quadruplex structures.
Auteurs : Jun-Huei Fan [États-Unis] ; Elena Bochkareva ; Alexey Bochkarev ; Donald M. GraySource :
- Biochemistry [ 1520-4995 ] ; 2009.
Descripteurs français
- KwdFr :
- Conformation d'acide nucléique, Cristallographie aux rayons X, Dichroïsme circulaire, G-quadruplexes, Humains, Liaison aux protéines (génétique), Protéine A de réplication (), Protéine A de réplication (génétique), Protéine A de réplication (métabolisme), Stabilité protéique, Température élevée, Test de retard de migration électrophorétique.
- MESH :
- génétique : Liaison aux protéines, Protéine A de réplication.
- métabolisme : Protéine A de réplication.
- Conformation d'acide nucléique, Cristallographie aux rayons X, Dichroïsme circulaire, G-quadruplexes, Humains, Protéine A de réplication, Stabilité protéique, Température élevée, Test de retard de migration électrophorétique.
English descriptors
- KwdEn :
- Circular Dichroism, Crystallography, X-Ray, Electrophoretic Mobility Shift Assay, G-Quadruplexes, Hot Temperature, Humans, Nucleic Acid Conformation, Protein Binding (genetics), Protein Stability, Replication Protein A (chemistry), Replication Protein A (genetics), Replication Protein A (metabolism).
- MESH :
- chemical , chemistry : Replication Protein A.
- genetics : Protein Binding, Replication Protein A.
- chemical , metabolism : Replication Protein A.
- Circular Dichroism, Crystallography, X-Ray, Electrophoretic Mobility Shift Assay, G-Quadruplexes, Hot Temperature, Humans, Nucleic Acid Conformation, Protein Stability.
Abstract
Noncanonical DNA structures such as G-quadruplexes might obstruct the binding of hRPA, compromising the accuracy of replication, and be a source of genomic instability. In this study, circular dichroism (CD) and electrophoretic mobility shift assay (EMSA) experiments were used to show that hRPA can bind and melt nontelomeric, intramolecular DNA G-quadruplexes under physiologically germane conditions. EMSA results show that hRPA binds to a 58-mer that includes an embedded quadruplex with an affinity equal to or greater than to nonquadruplex forming 58-mers. Moreover, hRPA binds to a 26-mer purine-rich quadruplex-forming sequence with an affinity indistinguishable from that for binding to the complementary pyrimidine-rich sequence. Under the same conditions, hRPA does not have significant affinity for binding to the duplex formed from the two sequences. Thus, DNA secondary structures can significantly modulate the binding affinity of hRPA over and above its known preference for pyrimidine-rich single-stranded sequences, so that at least some intramolecular G-quadruplex structures may not inhibit hRPA binding during DNA replication. CD spectral changes in combination with EMSA titrations suggest that one hRPA heterotrimer is sufficient to form a stable complex with an unfolded 26-mer G-quadruplex prior to the binding of a second hRPA molecule.
DOI: 10.1021/bi801538h
PubMed: 19187036
Affiliations:
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pubmed:19187036Le document en format XML
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<term>Hot Temperature</term>
<term>Humans</term>
<term>Nucleic Acid Conformation</term>
<term>Protein Binding (genetics)</term>
<term>Protein Stability</term>
<term>Replication Protein A (chemistry)</term>
<term>Replication Protein A (genetics)</term>
<term>Replication Protein A (metabolism)</term>
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<term>Cristallographie aux rayons X</term>
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<term>G-quadruplexes</term>
<term>Humains</term>
<term>Liaison aux protéines (génétique)</term>
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<term>Protéine A de réplication (génétique)</term>
<term>Protéine A de réplication (métabolisme)</term>
<term>Stabilité protéique</term>
<term>Température élevée</term>
<term>Test de retard de migration électrophorétique</term>
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<term>Replication Protein A</term>
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<term>Electrophoretic Mobility Shift Assay</term>
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<term>Humans</term>
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<term>Protein Stability</term>
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<term>Cristallographie aux rayons X</term>
<term>Dichroïsme circulaire</term>
<term>G-quadruplexes</term>
<term>Humains</term>
<term>Protéine A de réplication</term>
<term>Stabilité protéique</term>
<term>Température élevée</term>
<term>Test de retard de migration électrophorétique</term>
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<front><div type="abstract" xml:lang="en">Noncanonical DNA structures such as G-quadruplexes might obstruct the binding of hRPA, compromising the accuracy of replication, and be a source of genomic instability. In this study, circular dichroism (CD) and electrophoretic mobility shift assay (EMSA) experiments were used to show that hRPA can bind and melt nontelomeric, intramolecular DNA G-quadruplexes under physiologically germane conditions. EMSA results show that hRPA binds to a 58-mer that includes an embedded quadruplex with an affinity equal to or greater than to nonquadruplex forming 58-mers. Moreover, hRPA binds to a 26-mer purine-rich quadruplex-forming sequence with an affinity indistinguishable from that for binding to the complementary pyrimidine-rich sequence. Under the same conditions, hRPA does not have significant affinity for binding to the duplex formed from the two sequences. Thus, DNA secondary structures can significantly modulate the binding affinity of hRPA over and above its known preference for pyrimidine-rich single-stranded sequences, so that at least some intramolecular G-quadruplex structures may not inhibit hRPA binding during DNA replication. CD spectral changes in combination with EMSA titrations suggest that one hRPA heterotrimer is sufficient to form a stable complex with an unfolded 26-mer G-quadruplex prior to the binding of a second hRPA molecule.</div>
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