MAT1 Antibody – Rabbit

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]

MNAT1: Stabilizes the cyclin H-CDK7 complex to form a functional CDK-activating kinase (CAK) enzymatic complex. CAK activates the cyclin-associated kinases CDK1, CDK2, CDK4 and CDK6 by threonine phosphorylation. CAK complexed to the core-TFIIH basal transcription factor activates RNA polymerase II by serine phosphorylation of the repetitive C-terminus domain (CTD) of its large subunit (POLR2A), allowing its escape from the promoter and elongation of the transcripts. Involved in cell cycle control and in RNA transcription by RNA polymerase II.

Protein type: Nuclear receptor co-regulator; Cell cycle regulation; Ubiquitin ligase; Ubiquitin conjugating system

Chromosomal Location of Human Ortholog: 14q23

Cellular Component: nucleoplasm; holo TFIIH complex; cytoplasm

Molecular Function: RNA polymerase subunit kinase activity; DNA-dependent ATPase activity; protein binding; zinc ion binding; protein N-terminus binding

Biological Process: transcription from RNA polymerase II promoter; viral reproduction; positive regulation of viral transcription; positive regulation of smooth muscle cell proliferation; protein amino acid phosphorylation; regulation of gene expression, epigenetic; mRNA capping; negative regulation of gene expression, epigenetic; transcription-coupled nucleotide-excision repair; protein complex assembly; nucleotide-excision repair, DNA damage removal; G2/M transition of mitotic cell cycle; adult heart development; transcription initiation from RNA polymerase II promoter; ventricular system development; transcription from RNA polymerase I promoter; RNA elongation from RNA polymerase I promoter; termination of RNA polymerase I transcription; DNA repair; regulation of transcription from RNA polymerase II promoter; cell proliferation; nucleotide-excision repair; RNA elongation from RNA polymerase II promoter; gene expression; positive regulation of transcription from RNA polymerase II promoter; mitotic cell cycle; regulation of cyclin-dependent protein kinase activity; response to calcium ion; transcription initiation from RNA polymerase I promoter; G1/S transition of mitotic cell cycle; negative regulation of apoptosis