Molecular mimicry of SUMO promotes DNA repair.

Molecular mimicry of SUMO promotes DNA repair.
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DOI:
10.1038/nsmb.1582
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发表时间:
2009-05
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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Rad60家族成员包含功能神秘的、完整的sumo样结构域(SLDs)。有趣的是,我们发现尽管它们与SUMO不同,但每个Rad60 SLD都与SUMO途径酶的一个子集相互作用。SLD2特异性结合SUMO E2偶联酶(Ubc9),而SLD1结合SUMO E1激活酶和E3特异性酶。Rad60 SLD2的0.97 Å晶体结构揭示了这种选择性的分子基础,表明除了保守的非底物SUMO:Ubc9界面外,SLD2的表面特征与SUMO不同。取消SLD2:Ubc9 feg基序依赖的相互作用会导致对基因毒性应激的超敏反应,并增加自发的异常复制叉相关重组。我们的研究结果为Rad60和SUMO在基因毒性应激存活中几乎相同的作用提供了机制基础,并表明SLDs在调节SUMO化方面具有前所未有的DNA损伤反应功能。
Rad60 family members contain functionally enigmatic, integral SUMO-like domains (SLDs). Intriguingly, we find that despite their divergence from SUMO, each Rad60 SLD interacts with a subset of SUMO pathway enzymes. SLD2 specifically binds the SUMO E2 conjugating enzyme (Ubc9), whereas SLD1 binds the SUMO E1 activating and E3 specificity enzymes. The molecular basis of this selectivity is revealed by our 0.97 Å crystal structure of Rad60 SLD2, which shows that apart from the conserved non-substrate SUMO:Ubc9 interface, SLD2 surface features are distinct from those of SUMO. Abrogation of the SLD2:Ubc9 FEG-motif dependent interaction results in hypersensitivity to genotoxic stress, and an increase in spontaneous aberrant replication fork-associated recombination. Our results provide a mechanistic basis for the near synonymous roles of Rad60 and SUMO in survival of genotoxic stress, and suggest unprecedented DNA damage response functions for SLDs in regulating sumoylation.
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