Correlations between myosin light chain isoforms and glycolytic characteristics in porcine longissimus dorsi muscle

摘要

The objective of this study was to investigate the content of myosin light chain (MLC) isoforms and their relationships with the glycolytic rate, metabolite contents, and activities of glycolytic enzymes in the porcine longissimus dorsi muscle. A total of 57 crossbred pigs were evaluated in this study. There were no correlations between the content of MLC isoforms and muscle pH (45 min and 24 h postmortem). However, MLC Is isoform content was positively correlated with glycogen content at 24 h postmortem (r=0.28, P<0.05), and negatively correlated with lactate content at 45 min postmortem (r=M>.35, P＜0.01). The content of MLC 3f isoform had a positive correlation with the activity of pyruvate kinase (r=0.44, P<0.01), while the ratio of fast/slow isoform showed a positive correlation with lactate content at 45 min postmortem (r=0.28, P<0.05). Thus, the composition of MLC isoforms can influence postmortem rigor development in the porcine longissimus dorsi muscle, and consequently meat quality indirectly.