Functional dynamics in RPA DNA binding and protein recruitment domains

Replication Protein A (RPA) is an essential scaffold for many DNA processing machines whose function relies on its modular architecture. Here we report 15 N-NMR heteronuclear relaxation analysis to characterize the movements of ssDNA binding and protein interaction modules in the RPA70 subunit. Our...

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Bibliographic Details
Published in:Structure (London) 2015-05, Vol.23 (6), p.1028-1038
Main Authors: Brosey, Chris A., Soss, Sarah E., Brooks, Sonja, Yan, Chunli, Ivanov, Ivaylo, Dorai, Kavita, Chazin, Walter J.
Format: Article
Language:English
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Summary:Replication Protein A (RPA) is an essential scaffold for many DNA processing machines whose function relies on its modular architecture. Here we report 15 N-NMR heteronuclear relaxation analysis to characterize the movements of ssDNA binding and protein interaction modules in the RPA70 subunit. Our results provide direct evidence for coordination of the motion of the tandem RPA70AB ssDNA binding domains. Moreover, binding of ssDNA substrate is found to cause dramatic reorientation and full coupling of inter-domain motion. In contrast, the RPA70N protein interaction domain remains structurally and dynamically independent of RPA70AB regardless of binding of ssDNA. This autonomy of motion between the 70N and 70AB modules supports a model in which the two binding functions of RPA are mediated fully independently, but remain differentially coordinated depending on the length of their flexible tethers. A critical role for linkers between the globular domains in determining the functional dynamics of RPA is proposed.
ISSN:0969-2126
1878-4186
DOI:10.1016/j.str.2015.04.008