1. Signaling Pathways
  2. Cell Cycle/DNA Damage
  3. CDK
  4. CLK Isoform


The CLK family consists of CLK1, CLK2, CLK3, and CLK4 with highlighted differences in the ATP-binding region.  CLKs are evolutionary conserved dual-specificity kinases that are able to phosphorylate serine, threonine, and tyrosine residues. CLKs catalyze the phosphorylation of SR proteins, serine, and arginine-rich splicing factors 1-12 (SRSF1-12), which regulate the spliceosome molecular machinery. SR proteins seem to have very distinct functions based on their phosphorylation state. Interestingly, CLK1/4 activity is highly responsive to physiological temperature changes, which is caused by reversible temperature-dependent rearrangements in the kinase activation segment, reflected in temperature-dependent SR protein phosphorylation, splicing, and gene expression. Specifically, it has been shown that lower body temperature causes activation of CLK1/4, which leads to increased SR protein phosphorylation.

CLK Related Products (16):

Cat. No. Product Name Effect Purity
  • HY-15338
    Inhibitor 99.62%
    TG003 is a potent inhibitor of Clk1/Sty; inhibits Clk1 and Clk4 with IC50 values of 20 and 15 nM, respectively.
  • HY-112296
    Inhibitor 98.61%
    T025 is an orally active and highly potent inhibitor of Cdc2-like kinase (CLKs), with Kd values of 4.8, 0.096, 6.5, 0.61, 0.074, 1.5 and 32 nM for CLK1, CLK2, CLK3, CLK4, DYRK1A, DYRK1B and DYRK2, respectively.
  • HY-115470
    Inhibitor 98.40%
    CLK-IN-T3 is a high potent, selective, and stable CDC-like kinase (CLK) inhibitor with IC50s of 0.67 nM, 15 nM, and 110 nM for CLK1, CLK2, and CLK3 protein kinases, respectively.
  • HY-12828
    Inhibitor 99.31%
    KH-CB19 is a potent CLK (cdc2-like kinase) inhibitor (CLK1 IC50=19.7 nM; CLK3 IC50=530 nM).
  • HY-103647
    Inhibitor 98.78%
    K00546 is a potent CDK1 and CDK2 inhibitor with IC50s of 0.6 nM and 0.5 nM for CDK1/cyclin B and CDK2/cyclin A, respectively.
  • HY-146335
    CLK1/4-IN-1 (compound 31) is a potent and selective Clk1 and Clk4 inhibitor with an IC50 value of 9.7 nM and 6.6 nM, respectively.
  • HY-134911
    Inhibitor 99.88%
    HS-243 is a potent and selective IRAK-4 and IRAK-1 inhibitor, with IC50 values of 20 and 24 nM.
  • HY-113825
    CLK1/2-IN-2 is CLK1 and CLK2 inhibitor with IC50 values of 16 nM and 45 nM, respectively.
  • HY-15951
    Inhibitor 98.62%
    ML167 is a highly selective Cdc2-like kinase 4 (Clk4) inhibitor with IC50 of 136 nM, >10-fold selectivity for closely related kinases Clk1, Clk2, Clk3 and Dyrk1A/1B.
  • HY-103082
    Inhibitor 99.05%
    CLK1-IN-1 is a potent and selective of Cdc2-like kinase 1 (CLK1) inhibitor, with an IC50 of 2 nM.
  • HY-108709
    Inhibitor 99.08%
    CC-671 is a dual TTK protein kinase/CDC2-like kinase (CLK2) inhibitor with IC50s of 0.005 and 0.006 μM for TTK and CLK2, respectively.
  • HY-111379
    EHT 5372
    EHT 5372 is a highly potent and selective inhibitor of DYRK’s family kinases with IC50s of 0.22, 0.28, 10.8, 93.2, 22.8, 88.8, 59.0, 7.44, 221 nM for DYRK1A, DYRK1B , DYRK2, DYRK3, CLK1, CLK2, CLK4, GSK-3α, GSK-3β.
  • HY-12828A
    Inhibitor 99.66%
    KH-CB20, an E/Z mixture, is a potent and selective inhibitor of CLK1 and the closely related isoform CLK4, with an IC50 of 16.5 nM for CLK1.
  • HY-146587
    Haspin-IN-2 (compound 4) is a potent and selective haspin inhibitor with an IC50 of 50 nM.
  • HY-113831
    LK1/2-IN-3 (compound 3) is a potent and selective CLK1 and CLK2 inhibitor with IC50 values of 1.1, 2.1, 130, 260, 260 nM for CLK1, CLK2, SRPK1, SRPK2, SRPK3, respectively.
  • HY-146586
    Haspin-IN-1 (compound 2a) is a haspin inhibitor with an IC50 of 119 nM.