Cyclin-dependent kinase-2 (CDK2) is a member of protein kinase family. It plays an important
role in regulating various events of eukaryotic cell division cycle. Accumulated evidences indicated that over
expression of CDK2 should cause the abnormal regulation of cell-cycle, which would be directly associated
with hyperproliferation in cancer cells. Therefore, CDK2 was regarded as a potentially therapeutic target for
cancer therapy. Knowledge of crystallography and availability of X-ray crystal structure of CDK2 have enabled
us to understand the mode of CDK2 inhibition, which facilitated the development of numerous CDK2
inhibitors. Some of the CDK2 inhibitors were investigated clinically for their potential as anti-cancer agents.
In this review, we present the structure, functions and activation of CDK2 by cyclin binding with special focus on recent
advances in the development of different classes of CDK2 inhibitors. We also summarize different strategies to achieve
subtype specificity either by targeting a binding pocket other than ATP, i.e. allosteric ligand binding site or by natural protein
inhibitors capable to disrupt CDK2-cyclin complexes. It is possible to develop pharmacologically relevant cytotoxic
agents by specifically inhibiting CDK2 activity with lesser toxicity than traditional chemotherapeutic agents.
Keywords: Anti-cancer, anti-proliferative activity, CDK2, cell cycle, cyclin, kinase inhibitors.
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