Protein degradation during the cell cycle (Kopie 1)
Protein degradation plays a critical role in regulating the cell cycle by ensuring timely progression through its various phases. Key proteins, such as cyclins and cyclin-dependent kinase inhibitors, are selectively degraded to control the activation and inactivation of cyclin-dependent kinases (Cdks). The ubiquitin-proteasome system is the primary pathway for targeting these proteins for degradation, using ubiquitin ligases like the Anaphase Promoting Complex/Cyclosome (APC/C) and SCF complexes. This regulated degradation prevents the accumulation of cell cycle regulators at inappropriate times, maintaining proper cell cycle order and fidelity. Overall, protein degradation ensures the precise timing and coordination necessary for successful cell division.
