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Updated: Jul 5, 2026

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
Cyclin K condensates bridge CDK12 to phosphorylate and drive oncogenic YAP activation in hepatocellular carcinoma
Yang Sun1, Yu Zhang1, Weikang Yan2
1Laboratory of Targeted Therapy and Precision Medicine, Department of Clinical Laboratory, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China.
Abstract:
Targeting transcriptional condensates is an emerging paradigm for cancer therapy. A key player is the transcriptional coactivator YAP (Yes-associated protein), which drives tumor-specific programs that fuel tumor progression and therapeutic resistance. Cyclin K, partnered with cyclin-dependent kinases (CDKs) CDK12/CDK13, is essential for transcription elongation, but its role in specific oncogenic programs was unclear. Here, we identify Cyclin K as an essential vulnerability across multiple cancer types. The CDK12/Cyclin K complex binds YAP via Cyclin K and forms a regulatory condensate to bridge YAP phosphorylation by CDK12. Such a phosphorylation at threonine-398 impedes YAP inhibition by its canonical LATS kinases, stabilizes YAP, and enables its further condensation with TEAD4 to stimulate YAP oncogenic activity. Coexpression of CDK12/Cyclin K and YAP predicts sensitivity to Cyclin K inhibitors in hepatocellular carcinoma cells and patient-derived xenografts. Thus, we define CDK12/Cyclin K as a critical regulator of YAP-driven transcriptional addiction and a biomarker for patient stratification who mostly benefit from therapies targeting the CDK12/Cyclin K-YAP axis.
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