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CHANGE IN REGULATION OF MYOFIBRILLAR ATPase ACTIVITY BY CALCIUM DURING POSTMORTEM STORAGE OF MUSCLE
Author(s) -
IKEUCHI Y.,
ITO T.,
FUKAZAWA T.
Publication year - 1978
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1978.tb15307.x
Subject(s) - myofibril , calcium , chemistry , atpase , calcium atpase , postmortem changes , biophysics , biochemistry , medicine , endocrinology , biology , enzyme , pathology , organic chemistry
Postmortem change of rabbit myofibrillar ATPase activity was investigated at varying concentrations of free calcium ions. At concentrations of free calcium ions higher than 10 −7 M the ATPase activity increased with increasing postmortem time, while at concentrations of free calcium ions lower than 10 −7 M no significant change of the ATPase activity was found during postmortem storage of muscle. A slight shift of the myofibrillar pCa‐dependent ATPase activity curve toward lower calcium ion concentration occurred during postmortem storage: the affinity of myofibrils for calcium ions increased during postmortem storage.