从不同肌肉制备的肌原纤维和天然肌动球蛋白ATP酶对Ca2(+)和Sr2(+)的敏感性。
Ca2(+)- and Sr2(+)-sensitivity of the ATPase of myofibrils and natural actomyosins prepared from various muscles.
作者信息
Shiraishi F, Ohtsuki I
机构信息
Department of Clinical Pharmacology, Faculty of Medicine, Kyushu University, Fukuoka.
出版信息
Fukuoka Igaku Zasshi. 1990 Jul;81(7):237-41.
Ca2(+)- and Sr2(+)-sensitivity of myofibrils and natural actomyosins prepared from various kinds of muscles was investigated by examining the ATPase activity. Sr2+ at concentrations about 30 times higher than Ca2+ was required for activating the ATPase of myofibrils or natural actomyosins from fast skeletal, smooth and scallop striated muscles, while Sr2+ 8-13 times higher than Ca2+ was required for activating the slow skeletal or cardiac system. These findings were consistent with the previous report on the Ca2(+)- and Sr2(+)-sensitive superprecipitation of various natural actomyosins.
通过检测ATP酶活性，研究了从各种肌肉制备的肌原纤维和天然肌动球蛋白对Ca2(+)和Sr2(+)的敏感性。对于激活来自快速骨骼肌、平滑肌和扇贝横纹肌的肌原纤维或天然肌动球蛋白的ATP酶，所需的Sr2+浓度比Ca2+高约30倍，而对于激活慢速骨骼肌或心脏系统的ATP酶，所需的Sr2+比Ca2+高8 - 13倍。这些发现与之前关于各种天然肌动球蛋白对Ca2(+)和Sr2(+)敏感的超沉淀的报道一致。
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