该基因编码的蛋白是细胞周期蛋白依赖性蛋白激酶（cdk）家族的成员。cdk家族成员与酿酒酵母cdc28和裂殖酵母pombe cdc2的基因产物高度相似，是细胞周期进程的重要调控因子。该蛋白与细胞周期素h和mat1形成三聚体复合物，发挥cdk激活激酶（cak）的作用。它是转录因子tfiih的重要组成部分，参与转录起始和dna修复。这种蛋白质被认为是转录调控和细胞周期之间的直接联系。[由RefSeq提供，2008年7月]
The protein encoded by this gene is a member of the cyclin-dependent protein kinase (CDK) family. CDK family members are highly similar to the gene products of Saccharomyces cerevisiae cdc28, and Schizosaccharomyces pombe cdc2, and are known to be important regulators of cell cycle progression. This protein forms a trimeric complex with cyclin H and MAT1, which functions as a Cdk-activating kinase (CAK). It is an essential component of the transcription factor TFIIH, that is involved in transcription initiation and DNA repair. This protein is thought to serve as a direct link between the regulation of transcription and the cell cycle. [provided by RefSeq, Jul 2008]