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
Antony E
中科院分区:
生物学2区
文献类型:
--
作者:
Ahmad F;Patterson A;Deveryshetty J;Mattice JR;Pokhrel N;Bothner B;Antony E

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复制蛋白A (RPA)与单链DNA (ssDNA)结合,并与超过36种酶相互作用,并作为协调大多数DNA代谢过程的招募中心。RPA利用多个寡糖/寡核苷酸结合域与ssDNA结合,并根据其单独的DNA结合亲和力分为高亲和力和低亲和力DNA结合域(DBDs)。然而,最近的证据表明,dbd的dna结合动力学更好地定义了它们的作用。利用氢-氘交换质谱(HDX-MS),我们评估了人类RPA各个区域的ssdna驱动动力学。正如预期的那样,ssDNA结合在dbd A、B、C、D和e中显示出HDX的变化。然而,DBD-A和DBD-B是动态的,不显示出强大的dna依赖性保护。DBD-C在HDX中表现出最广泛的变化,表明其在稳定ssDNA上的RPA中起主要作用。较慢的变构变化发生在蛋白-蛋白相互作用域和连接体区域,因此不直接与ssDNA相互作用。在基于动态的RPA模型中,我们提出DBD-A和-B作为动态的一半,而DBD-C、-D和-E作为非动态的一半。因此,隐藏在动态半段下的ssDNA片段可能更容易被rpa相互作用的蛋白质接触到。RPA以两种动态方式与DNA结合。
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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