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Updated: Jul 18, 2025

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
Coming of Age: Targeting Cyclin K in Cancers
1Eppley Institute for Research in Cancer and Allied Diseases, Fred and Pamela Buffett Cancer Center, University of Nebraska Medical Center, Omaha, NE 68198, USA.
Abstract:
Cyclins and cyclin-dependent kinases (CDKs) play versatile roles in promoting the hallmarks of cancer. Therefore, cyclins and CDKs have been widely studied and targeted in cancer treatment, with four CDK4/6 inhibitors being approved by the FDA and many other inhibitors being examined in clinical trials. The specific purpose of this review is to delineate the role and therapeutic potential of Cyclin K in cancers. Studies have shown that Cyclin K regulates many essential biological processes, including the DNA damage response, mitosis, and pre-replicative complex assembly, and is critical in both cancer cell growth and therapeutic resistance. Importantly, the druggability of Cyclin K has been demonstrated in an increasing number of studies that identify novel opportunities for its use in cancer treatment. This review first introduces the basic features and translational value of human cyclins and CDKs. Next, the discovery, phosphorylation targets, and related functional significance of Cyclin K-CDK12/13 complexes in cancer are detailed. This review then provides a summary of current Cyclin K-associated cancer studies, with an emphasis on the available Cyclin K-targeting drugs. Finally, the current knowledge gaps regarding the potential of Cyclin K in cancers are discussed, along with interesting directions for future investigation.
Insights
Cyclin K is a key regulator in cancer cell growth and therapeutic resistance, offering new drug targets. This review explores Cyclin K
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Cyclins and cyclin-dependent kinases (CDKs) are crucial in cancer development.
- Several CDK4/6 inhibitors are FDA-approved, highlighting CDK pathway importance in cancer therapy.
- Cyclin K's role in cancer remains less understood but shows therapeutic promise.
Purpose of the Study:
- To review the role and therapeutic potential of Cyclin K in various cancers.
- To detail the discovery, targets, and functions of Cyclin K-CDK12/13 complexes.
- To summarize current Cyclin K-targeting strategies and identify knowledge gaps.
Main Methods:
- Literature review of studies on Cyclin K in cancer.
- Analysis of Cyclin K's regulation of biological processes (DNA damage response, mitosis).
- Examination of Cyclin K-CDK12/13 complex functions and phosphorylation targets.
Main Results:
- Cyclin K regulates critical cellular processes including DNA damage response and mitosis.
- Cyclin K is implicated in cancer cell proliferation and resistance to therapy.
- Emerging evidence supports Cyclin K's druggability for cancer treatment.
Conclusions:
- Cyclin K presents a promising therapeutic target for novel cancer treatments.
- Further research into Cyclin K's mechanisms and drug development is warranted.
- Targeting Cyclin K could overcome therapeutic resistance in cancer.
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