AMP and IMP dissociate actomyosin into actin and myosin
2008
Okitani, A.(Nippon Veterinary and Life Science Univ., Musashino, Tokyo (Japan)) | Ichinose, N. | Koza, M. | Yamanaka, K. | Migita, K. | Matsuishi, M.
We investigated to determine why heating of squid muscle at 60degC induced the liberation of actin from myofibrils. When a mixture of a myofibrillar fraction and a low-molecular sarcoplasmic fraction prepared from squid muscle was heated at 60degC, actin liberation occurred. When a myofibrillar fraction was heated with ATP, AMP, or IMP, actin liberation occurred. Hence, AMP is perhaps one of the factors causing actin liberation in postmortem squid muscle. It was found that AMP and IMP reversibly dissociated actomyosin of chicken, bovine, and porcine skeletal muscles into actin and myosin on incubation at 0degC at pH 7.2 in 0.2 M KCl. These results led us to conclude that AMP and IMP were the most responsible factors causing actin liberation from myofibrils in the heated muscle and causing reversible dissociation of actomyosin on storage of skeletal muscle at a low temperature. Hence, AMP and IMP are possible factors causing the resolution of rigor mortis in muscles.
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