Identification of a novel, widespread, and functionally important PCNA-binding motif.

Identification of a novel, widespread, and functionally important PCNA-binding motif.
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DOI:
10.1083/jcb.200903138
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发表时间:
2009-09-07
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Otterlei M
Otterlei M
中科院分区:
其他
文献类型:
--
作者:
Gilljam KM;Feyzi E;Aas PA;Sousa MM;Müller R;Vågbø CB;Catterall TC;Liabakk NB;Slupphaug G;Drabløs F;Krokan HE;Otterlei M

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AlkB PCNA相互作用基序(APIM)存在于>200种蛋白质中,并且可能在遗传毒性应激期间介导PCNA结合。许多蛋白质,许多是DNA复制机制所必需的,通过称为PIP盒的PCNA相互作用肽(PIP)序列与增殖细胞核抗原(PCNA)相互作用。我们以前已经表明,氧化脱甲基酶人类AlkB同源物2(hABH 2)与PCNA共定位在复制灶。在这项研究中,我们表明,hABH 2通过一种新的PCNA相互作用基序,我们称之为AlkB同源2 PCNA相互作用基序(APIM)与后修饰的PCNA相互作用。我们在超过200种参与DNA维持、转录和细胞周期调控的其他蛋白质中鉴定了APIM,并在其中5种中验证了功能性APIM。APIM肽的表达增加了细胞对几种细胞生长抑制剂的敏感性,而这些细胞生长抑制剂并不是仅通过干扰hABH 2-PCNA相互作用来解释的。因此,APIM可能介导PCNA结合在许多蛋白质参与DNA修复和细胞周期控制在遗传毒性应激。
AlkB PCNA-interacting motif (APIM) is present in >200 proteins and may mediate PCNA binding during genotoxic stress. Numerous proteins, many essential for the DNA replication machinery, interact with proliferating cell nuclear antigen (PCNA) through the PCNA-interacting peptide (PIP) sequence called the PIP box. We have previously shown that the oxidative demethylase human AlkB homologue 2 (hABH2) colocalizes with PCNA in replication foci. In this study, we show that hABH2 interacts with a posttranslationally modified PCNA via a novel PCNA-interacting motif, which we term AlkB homologue 2 PCNA-interacting motif (APIM). We identify APIM in >200 other proteins involved in DNA maintenance, transcription, and cell cycle regulation, and verify a functional APIM in five of these. Expression of an APIM peptide increases the cellular sensitivity to several cytostatic agents not accounted for by perturbing only the hABH2–PCNA interaction. Thus, APIM is likely to mediate PCNA binding in many proteins involved in DNA repair and cell cycle control during genotoxic stress.
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