2. Signaling Pathways
  3. Cell Cycle/DNA Damage
  4. Checkpoint Kinase (Chk)

Checkpoint Kinase (Chk)

Checkpoint Kinase (Chk)

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DNA damage checkpoint and the spindle checkpoint are two cell cycle surveillance systems, which guard against genomic instability. The DNA damage checkpoint kinases CHK1 and CHK2 are central to the induction of cell cycle arrest, DNA repair, and apoptosis as elements in the DNA-damage checkpoint. The components of the spindle checkpoint include Mad1, Mad2, Mad3(BubR1), Bub3 and the kinases Bub1, Mph1(Mps1) and Aurora B.

Cells that suffer DNA damage activate the checkpoint kinases CHK1 and CHK2, which signal to initiate repair processes, limit cell-cycle progression and prevent cell replication, until the damaged DNA is repaired.

The spindle checkpoint causes metaphase arrest when kinetochore-microtubules are unattached during mitosis. The SAC consists of ‘sensor’ proteins, such as Mad1, Bub1 and Mps1; a ‘signal transducer’, consisting of the mitotic checkpoint complex, composed of Mad2, Bub3, BubR1 and Cdc20; and an ‘effector’ known as the anaphase promoting complex/cyclosome (APC/C).

Checkpoint Kinase (Chk) Isoform Specific Products:

Checkpoint Kinase (Chk) Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-10992
    AZD-7762
    		Inhibitor 99.94%
    AZD-7762 is a potent ATP-competitive checkpoint kinase (Chk) inhibitor in with an IC50 of 5 nM for Chk1.
    AZD-7762
  • HY-18174
    Prexasertib
    		Inhibitor 98.74%
    Prexasertib (LY2606368) is a selective, ATP-competitive second-generation checkpoint kinase 1 (CHK1) inhibitor with a Ki of 0.9 nM and an IC50 of <1 nM. Prexasertib inhibits CHK2 (IC50=8 nM) and RSK1 (IC50=9 nM). Prexasertib causes double-stranded DNA breakage and replication catastrophe resulting in apoptosis. Prexasertib shows potent anti-tumor activity.
    Prexasertib
  • HY-P99032
    Monalizumab
    		Inhibitor 99.08%
    Monalizumab (IPH2201) is an immune checkpoint inhibitor targeting Natural Killer Group 2A (NKG2A). Monalizumab, a humanized anti-NKG2A blocking mAb, increases IFN-γ production, thereby promoting NK cell effector functions. Monalizumab can be used for the research of head and neck squamous cell carcinoma (HNSCC).
    Monalizumab
  • HY-14720
    Rabusertib
    		Inhibitor 99.99%
    Rabusertib (LY2603618) is a potent and selective inhibitor of Chk1 with an IC50 of 7 nM.
    Rabusertib
  • HY-15532
    SCH900776
    		Inhibitor 99.97%
    SCH900776 (MK-8776) is a potent, selective and orally bioavailable inhibitor of checkpoint kinase1 (Chk1) with an IC50 of 3 nM. SCH900776 shows 50- and 500-fold selectivity over CDK2 and Chk2, respectively.
    SCH900776
  • HY-124731
    PD-321852
    		Inhibitor
    PD-321852 is a Chk1 inhibitor, with IC50 of 5 nM. PD-321852 can be used in anti-cancer research.
    PD-321852
  • HY-124122
    BPTQ
    		Inhibitor
    BPTQ is a potent inhibitor against VEGFR1/Flt-1 and CHK2 with IC50 values of 0.54 and 1.70 µmol/L, respectively. BPTQ is also an intercalator of DNA with anticancer activities. BPTQ inhibits the proliferation of HL-60 cells by arresting cells at S and G2/M phase with an IC50 value of 12 µmol/L. BPTQ also activates the mitochondria-mediated Apoptosis pathway by a decrease in mitochondrial membrane potential, increase in the Bax:Bcl-2 ratio and activation of caspases.
    BPTQ
  • HY-P10574
    Phosphorylated CHKtide
    Phosphorylated CHKtide is a synthetic peptide substrate derived from CDC25C, which is phosphorylated by CHK1/CHK2 in one of the DNA repair pathways. Phosphorylated CHKtide is used in the assays of cell cycle checkpoint kinases 1 and 2 (CHK1/CHK2) and salt-inducible kinases (SIKs).
    Phosphorylated CHKtide
  • HY-13946
    BML-277
    		Inhibitor 99.74%
    BML-277 is a selective checkpoint kinase 2 (Chk2) inhibitor with an IC50 of 15 nM.
    BML-277
  • HY-18958
    CCT245737
    		Inhibitor 99.24%
    CCT245737 (SRA737) is an orally active and seletive Chk1 inhibitor, with an IC50 of 1.3 nM.
    CCT245737
  • HY-13263
    CHIR-124
    		Inhibitor 99.05%
    CHIR-124 is a potent and selective Chk1 inhibitor with IC50 of 0.3 nM, and also potently targets PDGFR and FLT3 with IC50s of 6.6 nM and 5.8 nM.
    CHIR-124
  • HY-18174A
    Prexasertib dihydrochloride
    		Inhibitor 99.41%
    Prexasertib dihydrochloride (LY2606368 dihydrochloride) is a selective, ATP-competitive second-generation checkpoint kinase 1 (CHK1) inhibitor with a Ki of 0.9 nM and an IC50 of <1 nM. Prexasertib dihydrochloride inhibits CHK2 (IC50=8 nM) and RSK1 (IC50=9 nM). Prexasertib dihydrochloride causes double-stranded DNA breakage and replication catastrophe resulting in apoptosis. Prexasertib dihydrochloride shows potent anti-tumor activity.
    Prexasertib dihydrochloride
  • HY-14715B
    CCT241533 hydrochloride
    		Inhibitor 99.51%
    CCT241533 hydrochloride is a potent and selective CHK2 inhibitor with an IC50 of 3 nM and a Ki of 1.16 nM.
    CCT241533 hydrochloride
  • HY-18961
    PD 407824
    		Inhibitor 98.34%
    PD 407824 is a checkpoint kinase Chk1 and WEE1 inhibitor with IC50s of 47 and 97 nM, respectively. PD 407824 is a chemical BMP sensitizer and increases the sensitivity of cells to sub-threshold amounts of BMP4.
    PD 407824
  • HY-10032
    PF 477736
    		Inhibitor 99.21%
    PF 477736 (PF 00477736) is a potent, selective and ATP-competitive inhibitor of Chk1, with a Ki of 0.49 nM, it is also a Chk2 inhibitor, with a Ki of 47 nM. PF 477736 shows <100-fold selectivity for Chk1 over VEGFR2/KDR/Flk-1, Fms, Yes, Aurora-A, FGFR3, Flt3, and Ret (IC50=8 (Ki), 10, 14, 23, 23, 25, and 39 nM, respectively). PF 477736 can enhance Gemcitabine antitumor activity in vitro and in vivo.
    PF 477736
  • HY-112167
    GDC-0575
    		Inhibitor 99.50%
    GDC-0575 (ARRY-575, RG7741) is a highly-selective oral small-molecule Chk1 inhibitor with an IC50 of 1.2 nM.
    GDC-0575
  • HY-18175
    CCT244747
    		Inhibitor 99.17%
    CCT244747 is a potent, orally bioavailable and highly selective CHK1 inhibitor, with an IC50 of 7.7 nM; CCT244747 also abrogates G2 checkpoint with an IC50 of 29 nM.
    CCT244747
  • HY-18174E
    Prexasertib dimesylate
    		Inhibitor 99.04%
    Prexasertib dimesylate (LY2606368 dimesylate) is a selective, ATP-competitive second-generation checkpoint kinase 1 (CHK1) inhibitor with a Ki of 0.9 nM and an IC50 of <1 nM. Prexasertib dimesylate inhibits CHK2 (IC50=8 nM) and RSK1 (IC50=9 nM). Prexasertib dimesylate causes double-stranded DNA breakage and replication catastrophe resulting in apoptosis. Prexasertib dimesylate shows potent anti-tumor activity.
    Prexasertib dimesylate
  • HY-107407
    SB-218078
    		Inhibitor 98.3%
    SB-218078 is a potent, selective, ATP-competitive and cell-permeable checkpoint kinase 1 (Chk1) inhibitor that inhibits Chk1 phosphorylation of cdc25C with an IC50 of 15 nM. SB-218078 is less potently inhibits Cdc2 (IC50 of 250 nM) and PKC (IC50 of 1000 nM). SB-218078 causes apoptosis by DNA damage and cell cycle arrest.
    SB-218078
  • HY-19926
    GDC-0425
    		Inhibitor 99.60%
    GDC-0425 (RG-7602) is an orally available, highly selective small molecule ChK1 inhibitor. GDC-0425 can be used for the research of various malignancies.
    GDC-0425
Cat. No. Product Name / Synonyms Species Source
Cat. No. Product Name / Synonyms Application Reactivity
Checkpoint Kinase (Chk) Isoform Comparison

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