Question
Explain the physiological significance of regulated protein degradation in cell cycle control and stress responses.
Answer :
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Regulated protein degradation plays a crucial role in maintaining cellular homeostasis by controlling the abundance and activity of specific proteins in response to physiological cues. In the context of the cell cycle, timely degradation of cyclins and other regulatory proteins ensures the proper progression through different phases. For instance, cyclins bind to cyclin-dependent kinases (CDKs) to activate them, and their accumulation or removal dictates the transition between G1, S, G2, and M phases. Ubiquitin-mediated proteolysis, particularly through the anaphase-promoting complex/cyclosome (APC/C) and SCF (Skp1–Cullin–F-box) complexes, tags
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