Condensin I interacts with the PARP-1-XRCC1 complex and functions in DNA single-strand break repair.

Condensin I interacts with the PARP-1-XRCC1 complex and functions in DNA single-strand break repair.
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DOI:
10.1016/j.molcel.2006.01.036
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发表时间:
2006-03-17
期刊:
影响因子:
16
通讯作者:
Yokomori K
Yokomori K
中科院分区:
生物学1区
文献类型:
--
作者:
Heale JT;Ball AR Jr;Schmiesing JA;Kim JS;Kong X;Zhou S;Hudson DF;Earnshaw WC;Yokomori K

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凝聚素是重要的蛋白质复合体,对有丝分裂染色体的组织至关重要。关于凝聚素在间期的功能,特别是在哺乳动物细胞中的功能,人们知之甚少。在这里,我们报告了凝聚素I和DNA缺口传感器聚(ADP-核糖)聚合酶1(PARP-1)之间的间期特异性相互作用。我们发现,在单链断裂损伤(SSB)诱导下,凝聚素I、PARP-1和碱基切除修复(BER)因子XRCC1之间的关联显著增加。还观察到凝聚素I与误码因子翻盖内切酶1(FEN-1)和DNA聚合酶δ/ε的损伤特异性关联,表明凝聚素I被招募来与误码因子在损伤部位相互作用。与此一致,DNA损伤迅速刺激PARP-1、凝聚素I和XRCC1的染色质关联。此外,体内凝聚素的耗尽会损害SSB,但不会损害双链断裂(DSB)的修复。我们的结果确定了凝聚素I通过PARP-1的SSB特异性反应,并证明了凝聚素在SSB修复中的作用。
Condensins are essential protein complexes critical for mitotic chromosome organization. Little is known about the function of condensins during interphase, particularly in mammalian cells. Here we report the interphase-specific interaction between condensin I and the DNA nick-sensor poly(ADP-ribose) polymerase 1 (PARP-1). We show that the association between condensin I, PARP-1, and the base excision repair (BER) factor XRCC1 increases dramatically upon singlestrand break damage (SSB) induction. Damage-specific association of condensin I with the BER factors flap endonuclease 1 (FEN-1) and DNA polymerase δ/ε was also observed, suggesting that condensin I is recruited to interact with BER factors at damage sites. Consistent with this, DNA damage rapidly stimulates the chromatin association of PARP-1, condensin I, and XRCC1. Furthermore, depletion of condensin in vivo compromises SSB but not double-strand break (DSB) repair. Our results identify a SSB-specific response of condensin I through PARP-1 and demonstrate a role for condensin in SSB repair.
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