ase complex with an apparent sedimentation dence that MCP breaks down the same pro- coefficient of 20S. Two types of regulatory teins in postmortem muscle as in in vitro tests complexes bind to both ends of the cylindri- (Huang et al. 2007). Proteasomes remained cal 20S. One complex, the 26S proteasome, relatively stable throughout 7 days of aging is a eukaryotic ATP-dependent protease in beef and rabbit muscle (Yamamoto et al. (Tanaka 1998) and hydrolyzes ubiquitin- 2009), supporting their potential role in meat conjugated proteins (Tanaka 1998; Delbarre- tenderization. Aging/Tenderization Mechanisms 91 Current Enzymatic Model of substantially diminishes early postmortem, Postmortem Proteolysis and and (2) the fact that many of the conclusions
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