A ubiquitin-binding domain in Cockayne syndrome B required for transcription-coupled nucleotide excision repair.

A ubiquitin-binding domain in Cockayne syndrome B required for transcription-coupled nucleotide excision repair.
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DOI:
10.1016/j.molcel.2010.04.017
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发表时间:
2010-06-11
期刊:
影响因子:
16
通讯作者:
Svejstrup JQ
Svejstrup JQ
中科院分区:
生物学1区
文献类型:
--
作者:
Anindya R;Mari PO;Kristensen U;Kool H;Giglia-Mari G;Mullenders LH;Fousteri M;Vermeulen W;Egly JM;Svejstrup JQ

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转录偶联核苷酸切除修复(TC-NER)使RNA聚合酶II(RNAPII)阻断病变迅速从转录的活性基因链中移除。人类TCR缺陷与Cockayne综合征(CS)有关,Cockayne综合征通常由CSA或CSB缺陷引起。在这里,我们证明了CSB包含一个泛素结合域(UBD)。表达无UBD的CSB(CSBdel)的细胞具有与缺乏CSB的细胞相似的表型,但这些表型可以通过添加异源UBD来抑制,因此泛素结合是CSB功能所必需的。令人惊讶的是,CSBdel仍然能够在损伤停滞的RNAPII周围组装核苷酸切除修复因子和修复合成蛋白质,但这样的修复复合体无法切除损伤。总之,我们的结果表明了蛋白质泛素化和CSB的UBD在TC-NER过程中触发损伤切割的关键作用,并使我们能够在该过程的模型中整合CsA和CSB的功能。►Cockayne综合征B蛋白含有一个羧基末端泛素结合结构域(UBD)►UBD缺失(CSBdel)导致缺乏CsB活性的细胞的典型表型►CSBdel在dna损伤处固定,不再支持转录再激活►CsBdel支持修复复合体的组装,但这些修复复合体不能被损伤切开
Transcription-coupled nucleotide excision repair (TC-NER) allows RNA polymerase II (RNAPII)-blocking lesions to be rapidly removed from the transcribed strand of active genes. Defective TCR in humans is associated with Cockayne syndrome (CS), typically caused by defects in either CSA or CSB. Here, we show that CSB contains a ubiquitin-binding domain (UBD). Cells expressing UBD-less CSB (CSBdel) have phenotypes similar to those of cells lacking CSB, but these can be suppressed by appending a heterologous UBD, so ubiquitin binding is essential for CSB function. Surprisingly, CSBdel remains capable of assembling nucleotide excision repair factors and repair synthesis proteins around damage-stalled RNAPII, but such repair complexes fail to excise the lesion. Together, our results indicate an essential role for protein ubiquitylation and CSB's UBD in triggering damage incision during TC-NER and allow us to integrate the function of CSA and CSB in a model for the process. ► Cockayne syndrome B protein harbors a carboxy-terminal ubiquitin-binding domain (UBD) ► UBD deletion (CSBdel) gives rise to the phenotypes typical of cells lacking CSB activity ► CSBdel becomes immobilized at DNA lesions and no longer supports transcription reactiviation ► CSBdel supports assembly of repair complexes, but these are incapable of damage incision
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