CCT251921 | CCT251921 : Inhibitor of CDK8, CDK19
RATINGS:
Cellular Use: (2 reviews)

In Model Organisms: (2 reviews)
Vendors

Probe Summary

Targets Biochemical/Biophysical Potency Cellular Potency
CDK8
  • IC50:2.3 ± 0.8 nM
  • IC50:33 ± 11 nM
  • IC50:22 ± 2
  • IC50:15 ± 1
  • IC50:64 ± 34 nM
  • IC50:4.9 nM
  • IC50: 11.8 ± 17.9 nM
CDK19
  • IC50:2.6 ± 0.4 nM
    Inhibitor
    up to 1 uM

    Selectivity

    In Vitro Selectivity Assessment
    Potency Assay Off-Target:
    CCT-251921 was tested at 1 µM across a panel of 279 kinases (Millipore Panel: data expressed as perc ...
    In Vitro Selectivity Assessment
    Potency Assay Off-Target:
    CCT-251921 was tested at 10 µM across a panel of 29 enzymes (CEREP) and tested at 10 µM across a pan ...
    In Vitro Selectivity Assessment
    Potency Assay Off-Target:
    CCT-251921 was profiled for inhibitory activity in enzymatic activity assays covering 32 human CDK/c ...
    In Cell Selectivity Assessment
    Potency Assay Off-Target:
    CDK8, CDK19 and CDK8/19 Double Knockout Cells were used to assess the selectivity of compound CCT-25 ...

    Potency
    Cellular
    In Vitro

    CDK8

    Mode of Action: Inhibitor

    Structure-Activity-Relationship data available? Yes

    DOI Reference: 10.1021/acs.jmedchem.5b01685

    CDK19

    Mode of Action: Inhibitor

    Structure-Activity-Relationship data available? Yes

    DOI Reference: 10.1021/acs.jmedchem.5b01685

    In Vivo Validations

    Mouse
    Dose: 0.2 mg/Kg IV, 0.5 mg/Kg PO
    Route of delivery: Intravenous, Oral
    Plasma half life: 0.78 h
    Systemic clearance: 0.61 L/h/Kg
    Bioavailability: 30%
    Volume of Distribution at Steady-State: 0.63 L/Kg

    DOI Reference: 10.1021/acs.jmedchem.5b01685

    Rat
    Dose: 0.2 mg/Kg IV, 0.5 mg/Kg PO
    Route of delivery: Intravenous, Oral
    Plasma half life: 1.10 h
    Systemic clearance: 1.49 L/h/Kg
    Bioavailability: 57%
    Volume of Distribution at Steady-State: 2.0 L/Kg

    DOI Reference: 10.1021/acs.jmedchem.5b01685

    Dog
    Dose: 0.2 mg/Kg IV, 0.5 mg/Kg PO
    Route of delivery: Intravenous, Oral
    Plasma half life: 0.99 h
    Systemic clearance: 1.07 L/h/Kg
    Bioavailability: 68%
    Volume of Distribution at Steady-State: 1.4 L/Kg

    DOI Reference: 10.1021/acs.jmedchem.5b01685

    Negative Control Compounds

    canSAR3447722
    Notes: CCT251099 is a structurally related but less active (20 fold) compound from the 3,4,5-trisubstituted series.
    CCT252313
    Notes: CT252313 lacks activity in multiple TCF/LEF reporter cell assays (IC₅₀ > 5 μM). CCT252313 did not demonstrate CDK8 binding into the micromolar range in competition bead binding assays but did retain some off-target binding activity.
    SMILES: O=C1NCCC12CN(C3=C(C4=CC=CC(N5CCN(CCC)CC5)=C4)C=NC=C3)CCC2

    Chemical Information

    Molecular Formula C21H23ClN6O
    SMILEs Cn1ncc2cc(-c3cnc(N)c(Cl)c3N3CCC4(CCNC4=O)CC3)ccc21
    InChI InChI=1S/C21H23ClN6O/c1-27-16-3-2-13(10-14(16)11-26-27)15-12-25-19(23)17(22)18(15)28-8-5-21(6-9-28)4-7-24-20(21)29/h2-3,10-12H,4-9H2,1H3,(H2,23,25)(H,24,29)
    Molecular weight 410.16 Da
    AlogP 2.977400000000001
    HBond acceptors 7
    HBond donors 3
    Atoms 52

    References

    Cross References

    Expert Reviews


    (on 9 Oct 2025 )
    Cellular Use Rating
    In Model Organisms
    CCT251921 (compound 109) is a potent, selective, and orally bioavailable small-molecule inhibitor of the Mediator complex-associated kinases CDK8 and CDK19. Developed through structure-based optimization...
    (on 15 Oct 2025 )
    Cellular Use Rating
    In Model Organisms
    CCT-251921 is an excellent probe for CDK8/CDK19 in terms of its selectivity. Its broad evaluation against 279 kinases in a Millipore kinase panel, as well as additional selectivity screens against seven...
    Note: The Chemical Probes Portal only endorses compounds as chemical probes for use as specific and selective modulators of the proposed target if they receive three or more (3-4) stars. Read more about our evaluation criteria