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The ubiquitin-proteasome system (UPS) controls intracellular protein turnover in a substrate-specific manner via E3-type ubiquitin ligases. Mammalian fertilization and particularly sperm penetration through the oocyte vitelline coat, the zona pellucida (ZP), is regulated by UPS. We use an extrinsic substrate of the proteasome-dependent ubiquitin-fusion degradation pathway, the mutant ubiquitin UBB...
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