Phosphorylation of the PCNA binding domain of the large subunit of replication factor C on Thr506 by cyclin-dependent kinases regulates binding to PCNA.

Phosphorylation of the PCNA binding domain of the large subunit of replication factor C on Thr506 by cyclin-dependent kinases regulates binding to PCNA.
复制标题

细胞周期蛋白依赖性激酶将复制因子 C 大亚基 Thr506 上的 PCNA 结合域磷酸化,调节与 PCNA 的结合。

DOI:
10.1093/nar/gkg692
复制
发表时间:
2003
影响因子:
14.9
通讯作者:
Jacquinod,Michel
Jacquinod,Michel
中科院分区:
生物学2区
文献类型:
--
作者:
Salles-Passador,Isabelle;Munshi,Anil;Cannella,Dominique;Pennaneach,Vincent;Koundrioukoff,Stephane;Jaquinod,Michel;Forest,Eric;Podust,Vladimir;Fotedar,Arun;Fotedar,Rati;Jacquinod,Michel

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复制因子 C (RF-C) 复合物与 DNA 引物结合并将 PCNA 加载到 DNA 上,从而提高 DNA 聚合酶的持续合成能力。我们之前已经在人类 RF-C (RF-Cp145) 大亚基中鉴定出一个与 PCNA 结合的独特区域,即结构域 B。我们在此表明​​ RF-Cp145 与 PCNA 的功能相互作用受到 cdk-cyclin 激酶的调节。作为 RF-C 复合物一部分的 RF-Cp145 或 RF-Cp145 结构域 B 被 cdk-细胞周期蛋白激酶磷酸化会抑制它们结合 PCNA 的能力。通过质谱法鉴定,RF-Cp145 中的 cdk-细胞周期蛋白磷酸化位点 Thr506 在体内也被磷酸化。 Thr506→Ala RF-Cp145 结构域 B 突变体是 cdk 细胞周期蛋白激酶的较差体外底物,因此,该突变体结合 PCNA 的能力不会被磷酸化抑制。通过生成针对 RF-Cp145 中磷酸化 Thr506 的抗体,我们证明了 Thr506 处内源性 RF-Cp145 的磷酸化是由 CDK 介导的,因为用 cdk-cyclin 抑制剂 roscovitine 处理细胞可以消除这种磷酸化。因此,我们在 RF-Cp145 的 PCNA 结合域内绘制了体内 cdk-cyclin 磷酸化位点。
Replication factor C (RF‐C) complex binds to DNA primers and loads PCNA onto DNA, thereby increasing the processivity of DNA polymerases. We have previously identified a distinct region, domain B, in the large subunit of human RF‐C (RF‐Cp145) which binds to PCNA. We show here that the functional interaction of RF‐Cp145 with PCNA is regulated by cdk‐cyclin kinases. Phosphorylation of either RF‐Cp145 as a part of the RF‐C complex or RF‐Cp145 domain B by cdk‐cyclin kinases inhibits their ability to bind PCNA. A cdk‐cyclin phosphorylation site, Thr506in RF‐Cp145, identified by mass spectrometry, is also phosphorylatedin vivo. A Thr506→Ala RF‐Cp145 domain B mutant is a poorin vitrosubstrate for cdk‐cyclin kinase and, consequently, the ability of this mutant to bind PCNA was not suppressed by phosphorylation. By generating an antibody directed against phospho‐Thr506in RF‐Cp145, we demonstrate that phosphorylation of endogenous RF‐Cp145 at Thr506is mediated by CDKs since it is abolished by treatment of cells with the cdk‐cyclin inhibitor roscovitine. We have thus mapped anin vivocdk‐cyclin phosphorylation site within the PCNA binding domain of RF‐Cp145.
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