CDK12-CCNK Heterodimer Protein, Human (Active, sf9, GST)

The CDK12 protein is a cyclin-dependent kinase that critically phosphorylates the C-terminal domain of POLR2A, thereby regulating transcription elongation. It selectively targets "Ser-5" phosphorylated at "Ser-7" in the CTD repeat and can also target "Ser-2". CDK12-CCNK Heterodimer Protein, Human (sf9, GST) is the recombinant human-derived CDK12-CCNK, expressed by Sf9 insect cells, with N-GST labeled tag.

The CDK12-CCNK heterodimer protein functions as a cyclin-dependent kinase, playing a crucial role in transcription elongation by phosphorylating the C-terminal domain (CTD) of the large subunit of RNA polymerase II (POLR2A). This kinase is a key regulator of gene expression, particularly involved in DNA repair processes and the maintenance of genomic stability. Its phosphorylation activity is selective, preferring 'Ser-5' in CTD repeats already phosphorylated at 'Ser-7,' but it can also target 'Ser-2.' CDK12-CCNK is essential for RNA splicing, potentially through the phosphorylation of SRSF1/SF2. Additionally, it participates in the regulation of MAP kinase activity, suggesting its involvement in influencing responses to estrogen inhibitors.

Human

Sf9 insect cells

N-GST

Q9NYV4-1 (Q696-S1082)&O75909-3 (K2-R580)

51755&8812

Approximately 90-100 kDa (CCNK) & 70-75 kDa (CDK12),based on SDS-PAGE under reducing conditions.

≥ 90%, as determined by reducing SDS-PAGE.

<1 EU/μg, determined by LAL method.