该基因编码的蛋白与细胞周期素H和CDK7一起形成CDK激活激酶（CAK）酶复合物该复合物激活多种细胞周期蛋白相关激酶，也可与tfiih结合，通过rna聚合酶ii激活转录。已经发现了两个编码不同亚型的转录变体。[由RefSeq提供，2011年9月]
The protein encoded by this gene, along with cyclin H and CDK7, forms the CDK-activating kinase (CAK) enzymatic complex. This complex activates several cyclin-associated kinases and can also associate with TFIIH to activate transcription by RNA polymerase II. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2011]