Binding of HTm4 to cyclin-dependent kinase (Cdk)-associated phosphatase (KAP)·Cdk2·cyclin A complex enhances the phosphatase activity of KAP, dissociates cyclin A, and facilitates KAP dephosphorylation of Cdk2

Masanobu Chinami, Yosihiko Yano, Xing Yang, Saira Salahuddin, Kosei Moriyama, Mitsunori Shiroishi, Helen Turner, Taro Shirakawa, Chaker N. Adra

研究成果: ジャーナルへの寄稿学術誌査読

24 被引用数 (Scopus)

抄録

Cyclin-dependent kinase 2 (cdk2) activation requires phosphorylation of Thr160 and dissociation from cyclin A. The T-loop of cdk2 contains a regulatory phosphorylation site at Thr160. An interaction between cdc-associated phosphatase (KAP) and cdk2 compromises the interaction between cdk2 and cyclin A, which permits access of KAP, a Thr160-directed phosphatase, to its substrate, cdk2. We have reported that KAP is bound and activated by a nuclear membrane protein, HTm4. Here, we present in vitro data showing the direct interaction between the HTm4 C terminus and KAP Tyr 141. We show that this interaction not only facilitates access of KAP to Thr160 and accelerates KAP kinetics, but also forces exclusion of cyclin A from the KAP·cdk2 complex.

本文言語英語
ページ(範囲)17235-17242
ページ数8
ジャーナルJournal of Biological Chemistry
280
17
DOI
出版ステータス出版済み - 4月 29 2005

!!!All Science Journal Classification (ASJC) codes

  • 生化学
  • 分子生物学
  • 細胞生物学

フィンガープリント

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