Contribution of calpain to protein degradation, variation in myowater properties and the water-holding capacity of pork during postmortem ageing.
To investigate calpain's effect on protein degradation, myowater properties, and the water-holding capacity (WHC), porcine longissimus muscles were incubated with control buffer, PD150,606 (calpain-specific inhibitor) and MG-262 (multiple-protease inhibitor) and assigned to an ageing period of 1, 4 or 7 d. Over 7 d of storage, no significant differences (P > 0.05) were observed in desmin or integrin expression between the MG-262 and PD150,606 groups, which indicated that calpain played a major role in protein proteolysis. Compared to those in the control group, muscle samples subjected to PD150,606 and MG-262 exhibited higher water mobility and a poorer WHC. Additionally, there were no significant differences in myowater properties or the WHC between the two groups at 1 d postmortem (P > 0.05). Calpain regulated the distribution and mobility of myowater, which contributed to a higher WHC in the early postmortem period (before 4 d), but other proteases tended to take over at a later stage.
['Qian|Shuyi|S|', 'Li|Xia|X|', 'Wang|Hang|H|', 'Wei|Xiuli|X|', 'Mehmood|Waris|W|', 'Zhang|Chunhui|C|', 'Blecker|Christophe|C|']
D000179:Acrylates D000818:Animals D001897:Boronic Acids D002154:Calpain D003893:Desmin D061353:Food Storage D016023:Integrins D008460:Meat D018482:Muscle, Skeletal D011480:Protease Inhibitors D059748:Proteolysis D013552:Swine D014867:Water
Calpain Water-holding capacity Myowater distribution and mobility Postmortem storage Protease inhibitors