Crystal structure of SUMO-modified proliferating cell nuclear antigen.
Crystal structure of SUMO-modified proliferating cell nuclear antigen.
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DOI:
10.1016/j.jmb.2010.12.015
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发表时间:
2011-02-11
影响因子:
5.6
通讯作者:
Washington MT
中科院分区:
文献类型:
--
作者:
Freudenthal BD;Brogie JE;Gakhar L;Kondratick CM;Washington MT
Eukaryotic proliferating cell nuclear antigen (PCNA) is a replication accessory protein that functions in DNA replication, repair, and recombination. The various functions of PCNA are regulated by post-translational modifications including mono-ubiquitylation, which promotes translesion synthesis, and sumoylation, which inhibits recombination. To understand how the SUMO modification regulates PCNA, we generated a split SUMO-modified PCNA protein and showed that it supports cell viability and stimulates DNA polymerase δ activity. We then determined its X-ray crystal structure and found that SUMO occupies a position on the back face of the PCNA ring, which is distinct from the position occupied by ubiquitin in the structure of ubiquitin-modified PCNA. We propose that the back of PCNA has evolved to be a site of regulation that can be easily modified without disrupting ongoing reactions on the front of PCNA, such as normal DNA replication. Moreover, these modifications likely allow PCNA to function as a tool belt, whereby proteins can be recruited to the replication machinery via the back of PCNA and be held in reserve until needed.
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影响因子:
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作者:
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通讯作者:
Burgers, PMJ
影响因子:
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DOI:
10.1107/s0907444904019158
发表时间:
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影响因子:
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