Role of the ubiquitin‐proteasome pathway on proteolytic activity in postmortem proteolysis and tenderisation of sheep skeletal muscle |
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| Authors: | Xin Li Li Chen Qingwu Shen Jianwen Tian Dequan Zhang |
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| Affiliation: | 1. Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro‐Product Processing, Ministry of Agriculture, Beijing, China;2. College of Food Science and Technology, Hunan Agricultural University, Changsha, Hunan, China;3. School of Agriculture, Ningxia University, Yinchuan, Ningxia, China |
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| Abstract: | The objective of this study was to investigate the effects of ubiquitin‐proteasome pathway on meat tenderisation. The sheep muscle longissimus lumborum was injected with or without PYR‐41 (inhibitor of ubiquitination) or MG‐132 (inhibitor of proteasome). Muscle samples were collected at 6, 15, 24 and 48 h after injection. Myofibrillar protein degradation, muscle ultrastructure and sarcomere length were determined. Results showed that inhibition of proteasome or ubiquitination affected sarcomere length at 48 h after treatments. Destruction of muscle ultrastructure in both treatments was reduced when compared to control. Inhibition of proteasome produced different fragments of myofibrillar proteins in comparison with control at 48 h. In conclusion, ubiquitin‐proteasome plays a role in postmortem proteolysis and might contribute to meat tenderisation. |
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| Keywords: | Proteasome sheep skeletal muscle tenderisation ubiquitin |
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