期刊
MEAT SCIENCE
卷 155, 期 -, 页码 50-60出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.meatsci.2019.04.015
关键词
Calpastatin; Postmortem proteome; Proteolysis; Heat shock protein
资金
- National Council for Scientific and Technological Development - CNPq, Brazil [002895/2014-05, 202452/2014-0]
- program Science without borders
- Iowa Agricultural and Home Economics Experiment Station [3721]
The aim of this study was to determine the extent to which calpastatin (CASN) variants (based on two chromatographic peaks; CASN-P1 and CASN-P2) explain variation in mu-calpain autolysis, protein degradation, and changes in the sarcoplasmic proteome observed during postmortem aging of beef. The Longissimus lumborum (LL) and Triceps brachii (TB) muscles were obtained from six crossbred steers and samples prepared from day 0, 1 and 7 postmortem (pm). The decline of CASN activity during aging was due to decrease of CASN-P2 in both muscles. The CASN-P2:mu-calpain ratio at day 0 was greater for TB, which presented lesser calpain autolysis, myofibrillar protein degradation, and fewer sarcoplasmic proteome changes during aging. Changes in abundance of Heat shock protein 70 family in the sarcoplasmic fraction were positively associated to proteolysis during aging, with greater differences in LL.
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