Cell Cycle Regulatory Proteins

Cell cycle regulatory proteins are a group of molecules that control the progression and fidelity of the cell cycle, ensuring proper cell division and response to internal and external signals. These proteins include both positive regulators (which promote cell cycle progression) and negative regulators (which halt or slow down the cycle in response to problems such as DNA damage. Key families include cyclins, cyclin-dependent kinases (Cdks), Cdk inhibitors (CKIs), Retinoblastoma protein (Rb), and p53. These proteins function through protein complex formation/dissociation, phosphorylation/dephosphorylation events, and targeted proteolysis via ubiquitination pathways to ensure orderly transitions between cell cycle phases and enforce checkpoints. Dysregulation is a hallmark feature in cancer development.

Various, including kinase inhibition, proteolysis induction, and transcriptional modulation.