Hydrogen-deuterium exchange reveals a dynamic DNA-binding map of replication protein A.
Hydrogen-deuterium exchange reveals a dynamic DNA-binding map of replication protein A.
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DOI:
10.1093/nar/gkaa1288
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发表时间:
2021-02-22
影响因子:
14.9
通讯作者:
Antony E
中科院分区:
文献类型:
--
作者:
Ahmad F;Patterson A;Deveryshetty J;Mattice JR;Pokhrel N;Bothner B;Antony E
Replication protein A (RPA) binds to single-stranded DNA (ssDNA) and interacts with over three dozen enzymes and serves as a recruitment hub to coordinate most DNA metabolic processes. RPA binds ssDNA utilizing multiple oligosaccharide/oligonucleotide binding domains and based on their individual DNA binding affinities are classified as high versus low-affinity DNA-binding domains (DBDs). However, recent evidence suggests that the DNA-binding dynamics of DBDs better define their roles. Utilizing hydrogen–deuterium exchange mass spectrometry (HDX-MS), we assessed the ssDNA-driven dynamics of the individual domains of human RPA. As expected, ssDNA binding shows HDX changes in DBDs A, B, C, D and E. However, DBD-A and DBD-B are dynamic and do not show robust DNA-dependent protection. DBD-C displays the most extensive changes in HDX, suggesting a major role in stabilizing RPA on ssDNA. Slower allosteric changes transpire in the protein–protein interaction domains and linker regions, and thus do not directly interact with ssDNA. Within a dynamics-based model for RPA, we propose that DBD-A and -B act as the dynamic half and DBD-C, -D and -E function as the less-dynamic half. Thus, segments of ssDNA buried under the dynamic half are likely more readily accessible to RPA-interacting proteins. RPA binds to DNA as two dynamic halves.
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发表时间:
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通讯作者:
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