Question
Discuss the ubiquitin-proteasome pathway in regulating intracellular protein turnover.
Answer :
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The ubiquitin-proteasome pathway is a central mechanism in molecular cell biology that regulates intracellular protein turnover, ensuring proper cellular function and homeostasis. Proteins in the cell are constantly synthesized and degraded, and the ubiquitin-proteasome system (UPS) selectively targets unwanted, misfolded, or damaged proteins for degradation. The process begins with the covalent attachment of ubiquitin, a small regulatory protein, to the substrate protein. This tagging involves a cascade of enzymatic reactions facilitated by three key enzymes: E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3
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