Structure and activation mechanism of the yeast RNA Pol II CTD kinase CTDK-1 complex.
Structure and activation mechanism of the yeast RNA Pol II CTD kinase CTDK-1 complex.
复制标题
酵母RNA Pol II CTD激酶CTDK-1复合物的结构和激活机制。
DOI:
10.1073/pnas.2019163118
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发表时间:
2021
影响因子:
11.1
通讯作者:
Ren,Yi
中科院分区:
文献类型:
--
作者:
Xie,Yihu;Lord,ChristopherL;Clarke,BradleyP;Ivey,AustinL;Hill,PateS;McDonald,WHayes;Wente,SusanR;Ren,Yi
The C-terminal domain (CTD) kinase I (CTDK-1) complex is the primary RNA Polymerase II (Pol II) CTD Ser2 kinase in budding yeast. CTDK-1 consists of a cyclin-dependent kinase (CDK) Ctk1, a cyclin Ctk2, and a unique subunit Ctk3 required for CTDK-1 activity. Here, we present a crystal structure of CTDK-1 at 1.85-Å resolution. The structure reveals that, compared to the canonical two-component CDK-cyclin system, the third component Ctk3 of CTDK-1 plays a critical role in Ctk1 activation by stabilizing a key element of CDK regulation, the T-loop, in an active conformation. In addition, Ctk3 contributes to the assembly of CTDK-1 through extensive interactions with both Ctk1 and Ctk2. We also demonstrate that CTDK-1 physically and genetically interacts with the serine/arginine-like protein Gbp2. Together, the data in our work reveal a regulatory mechanism of CDK complexes.