[Physico-chemical properties of uterine smooth muscle actomyosin].
The actomyosin complex of human myometrium has a low Ca-activated ATPase activity (0.007-0.012 mu mole H+ per 1 mg protein for 1 min), small degree and rate of superprecipitation. Transition to the state of pregnancy is accompanied by considerable changes in the physicochemical properties of the myometrium actomyosin. ATPase activity is 5-10 times as high and the rate of superprecipitation rises, particularly after the increase in the calcium concentration. The content of nucleic acid in the actomyosin complex decreases and D280/D260=1.1. The intensity of the actomyosin fluorescence at the pregnant state is more than twice as high.
D000205:Actomyosin / Q000032:analysis; D000255:Adenosine Triphosphate; D002118:Calcium; D002384:Catalysis; D055598:Chemical Phenomena; D002621:Chemistry; D004789:Enzyme Activation; D005260:Female; D006801:Humans; D009215:Myometrium / Q000032:analysis*; D011247:Pregnancy; D014599:Uterus / Q000032:analysis*
D000255:Adenosine Triphosphate; D000205:Actomyosin; D002118:Calcium
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