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- W2051210428 abstract "A new technique for obtaining a myofibril-like preparation from vertebrate smooth muscle has been developed. An actomyosin can be readily extracted from these myofibrils at low ionic strength and in yields 20 times as high as previously reported. The protein composition of all preparations has been monitored using dodecylsulfate-gel electrophoresis. By this method smooth muscle actomyosin showed primarily only the major proteins, myosin, actin and tropomyosin, while the myofibrils contained, additionally, three new proteins not previously described with polypeptide chain weights of 60000, 110000 and 130000. The ATPase activities of both the myofibrils and actomyosin preparations are considerably higher than previously described for vertebrate smooth muscle. They are sensitive to micromolar Ca2+ ion concentrations to the same degree as comparable skeletal and cardiac muscle preparations, even though troponin-like proteins could not be identified in these smooth muscle preparations. From the latter observation and the presence of Ca2+ -sensitivity in tropomyosin-free actomyosin it is suggested that this calcium sensitivity is, as in some invertebrate muscles, a property of the myosin molecule." @default.
- W2051210428 created "2016-06-24" @default.
- W2051210428 creator A5001077057 @default.
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- W2051210428 date "1975-06-01" @default.
- W2051210428 modified "2023-10-15" @default.
- W2051210428 title "Preparation and Properties of Vertebrate Smooth-Muscle Myofibrils and Actomyosin" @default.
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- W2051210428 doi "https://doi.org/10.1111/j.1432-1033.1975.tb02137.x" @default.
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