CDK-activating Kinase

CDK-activating kinase (CAK) activates the cyclin-CDK complex by phosphorylating threonine residue 160 in the CDK activation loop. CAK itself is a member of the Cdk family and functions as a positive regulator of Cdk1, Cdk2, Cdk4, and Cdk6.

Read more about CDK-activating Kinase:  Catalytic Activity, Orthologs, Structure, Additional Functions

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CDK-activating Kinase - Additional Functions
... In vertebrates, the trimeric CAK complex is responsible for transcription regulation ... In budding yeast, the Cdk7 homolog, Kin28, regulates transcription ...