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CDK inhibitors block cyclin-dependent kinases (CDKs), the serine/threonine kinases that drive the cell cycle. Each CDK becomes active only when bound to a cyclin partner, and successive cyclin-CDK complexes order DNA replication and mitosis. CDK4 and CDK6 pair with D-type cyclins to control progression through G1, while CDK1 governs entry into mitosis. Palbociclib and abemaciclib are selective CDK4/6 inhibitors used to study G1 arrest and retinoblastoma protein phosphorylation. Dinaciclib and seliciclib act on several family members, including CDK2, CDK5 and CDK9, which also links them to transcription research. Ro 3306 inhibits CDK1 and is used to hold cells reversibly at the G2/M boundary for synchronization experiments.
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[pThr3]-CDK5 Substrate is a specific substrate for cyclin-dependent kinase 5 (CDK5), functioning primarily through phosphorylation at threonine 3. This substrate is based on the histone H1 peptide sequence, which effectively binds within the active site of CDK5. It is phosphorylated by CDK5 with a Km value of 6 µM, making it useful for studies examining CDK5 activity and regulation in various biological contexts.
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CDK9 ligand 4 functions as a potent ligand for cyclin-dependent kinase 9 (CDK9). This compound is instrumental in the design and development of PROTAC-based degraders, facilitating targeted degradation of CDK9 proteins, which plays a crucial role in transcriptional regulation and HIV-1 infection research. CDK9 ligand 4 contributes significantly to studies aimed at therapeutic strategies against viral infections and dysregulated transcriptional processes.
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