1. Signaling Pathways
  2. Cell Cycle/DNA Damage
  3. TOPK


TOPK (T-lymphokine-activated killer cell–originated protein kinase, also known as PBK or PDZ-binding kinase) is a Ser/Thr protein kinase that is highly expressed in many types of human cancer, including breast and lung cancers. TOPK is included in the “consensus stemness ranking signature” gene list that is up-regulated in cancer stem cell-enriched tumors and is associated with poor prognosis in multiple types of cancer.

TOPK/PBK is an oncogenic kinase upregulated in most human cancers. TOPK is important for mitotic cell division and that phosphorylation by Cdk1 is needed for its activation.

TOPK, a member of the MEK3/6-related MAPKK family, is expressed in a wide range of proliferating cells and tissues, including cancer cells and testis. TOPK negatively regulates the activity of p38α by phosphorylating the p38α-specific phosphatase MKP1 and enhancing the stability of MKP1. The MAPK phosphatase MKP1, an archetypal member of the MKP family, plays a pivotal role in the deactivation of p38 through a dephosphorylation reaction.

TOPK Related Products (4):

Cat. No. Product Name Effect Purity
  • HY-12467
    OTS-964 Inhibitor 99.05%
    OTS-964 is a potent T-lymphokine-activated killer cell-originated protein kinase (TOPK) inhibitor (IC50=28 nM) with high affinity and selectivity. OT-S964 is also a potent inhibitor of the cyclin-dependent kinase CDK11, which binds to CDK11B with a Kd of 40 nM.
  • HY-101550
    HI-TOPK-032 Inhibitor 99.36%
    HI-TOPK-032 is a potent and specific TOPK inhibitor.
  • HY-18621
    OTS514 Inhibitor
    OTS514 is a highly potent TOPK inhibitor, which inhibits TOPK kinase activity with a median inhibitory concentration (IC50) value of 2.6 nM.
  • HY-B1156
    Cephradine Inhibitor
    Cephradine (Cefradine) is the first-generation broad-spectrum cephalosporin antibiotic, which also acts as an inhibitor of TOPK (T-LAK cell-originated protein kinase) and suppresses skin inflammation induced by excessive solar ultraviolet.
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