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

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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, FLAG) is a recombinant protein dimer complex containing human-derived CDK12-CCNK Heterodimer protein, expressed by sf9 insect cells , with N-Flag, N-GST labeled tag.

For research use only. We do not sell to patients.
  • Species: Human
  • Source: Sf9 insect cells
  • Storage:
    Stored at -80°C for 1 year from date of receipt. It is stable at -20°C for 3 months after opening. It is recommended to freeze aliquots at -80°C for extended storage. Avoid repeated freeze-thaw cycles.
  • CDK12-CCNK Heterodimer Protein, Human (Active, sf9, GST, FLAG) Product Image
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To place orders, for customer services and technical support, please contact: MedChemExpress USA

Tel: 609-228-6898 E-mail: [email protected] [email protected]

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To place orders, for customer services and technical support, please contact:

609-228-6898
[email protected] [email protected]
Find Your Local Distributor Your local distributor: Hycultec GmbHHycultec
  • Biological Activity
  • Technical Parameters
  • Product Properties
  • Documentation
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Biological Activity

Description

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, FLAG) is a recombinant protein dimer complex containing human-derived CDK12-CCNK Heterodimer protein, expressed by sf9 insect cells , with N-Flag, N-GST labeled tag.

Background

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.

Verified Bioactivity

The activity was measured by off-chip mobility shift assay(MSA). The enzyme was incubated with fluorecence-labeled substrate and Mg(or Mn)/ATP. The phosphorylated and unphosphorylated substrates were separated and detected by MSA device. The Km of CDK12-CCNK for its substrate is 30 μM.

Technical Parameters

  • Species Human
  • Source Sf9 insect cells
  • Tag N-Flag;N-GST
  • Accession

    Q9NYV4-1 (Q696-S1082)&O75909-1 (M1-S300)

  • Gene ID
    51755&8812
  • Synonyms

    CDK12; KIAA0904; Prev. CRKRS; Cell Division Cycle 2-Related Protein Kinase 7; CRK7; CDC2-Related Protein Kinase 7; Cdc2-Related Kinase, Arginine/Serine-Rich; CDC2 Related Protein Kinase 7; Cell Division Protein Kinase 12; HCDK12; Cyclin-Dependent Kinase 1

  • Predicted Molecular Mass

    71.4 kDa & 36.9 kDa

  • Purity

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

Product Properties

Appearance

Solution.

Formulation

Supplied as a 0.22 μm filtered solution of 20 mM HEPES, pH 7.5, 200 mM NaCl, 5% glycerol, 1 mM DTT.

Endotoxin Level

<1 EU/μg, determined by LAL method.

Reconstitution

Please use rapid thawing with running water to thaw the protein.

Storage & Stability

Stored at -80°C for 1 year from date of receipt. It is stable at -20°C for 3 months after opening. It is recommended to freeze aliquots at -80°C for extended storage. Avoid repeated freeze-thaw cycles.

Shipping

Shipping with dry ice.

Calculators

Reconstitution Calculator

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Dilution Calculator

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The Specific Activity Calculator Equation
  • Specific Activity (Unit/mg)
  • Biological Activity (ED50)

Specific Activity (Unit/mg) = 106 ÷ Biological Activity (ED50)

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MOQ
Minimum order quantity
100 mg

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Measured by its ability to inhibit anti-CD3-induced proliferation of stimulated CTLL-2 mouse cytotoxic T cells. The ED50 this effect is 0.8023 μg/ml, corresponding to a specific activity is 1246.42 units/mg.

Assay Types
  • CDK12-CCNK Heterodimer Protein, Human (Active, sf9, GST, FLAG) Product Image
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  • CDK12-CCNK Heterodimer Protein, Human (Active, sf9, GST, FLAG) Product Image