Describe the role of ubiquitin in protein turnover

Ubiquitin plays a crucial role in the regulation of protein turnover by targeting proteins for degradation via the ubiquitin-proteasome pathway. This process helps maintain cellular homeostasis by removing damaged, misfolded, or regulatory proteins that are no longer needed. The attachment of ubiquitin, a small 76-amino acid protein, to a target protein marks it for degradation. ___ _____ ________ _____ ______ ______ _____ ________ __________ ___ _____.
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