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• W2056566634 abstract "Subfractionation of sarcoplasmic reticulum from fast-twitch and slow-twitch rabbit skeletal muscles was performed on a sucrose density gradient. Vesicle fractions were characterized by: measurement of (Ca2+,Mg2+)-dependent (extra) ATPase, Mg2+-dependent (basal) ATPase, Ca2+ uptake characteristics, polypeptide patterns in sodium dodecylsulphate polyacrylamide gel electrophoreses, phosphoprotein formation and electronmicroscopy of negatively stained samples. In fast-twitch muscle, low and high density vesicles were separated. The latter showed high activity of (Ca2+,Mg2+)-dependent ATPase, negligible activity of Mg2+-dependent ATPase, high initial rate and high capacity of Ca2+ uptake, high amount of phosphorylated 115000-Mr polypeptide, and appeared morphologically as thin-walled vesicles covered with particles of 4 nm in diameter. Low density vesicles had little (Ca2+,Mg2+)-dependent ATPase but high Mg2+-dependent ATPase. Although the initial rate of Ca2+ uptake was markedly lower, the total capacity of uptake was comparable with that of high density vesicles. Phosphorylated 115000-Mr polypeptide was detectable at low concentrations. Instead, 57000 and 47000-Mr polypeptides were characterized as forming stable phosphoproteins in the presence of ATP and Mg2+. Negatively stained, these vesicles appeared to have smooth surfaces. It is suggested that low density vesicles represent a Ca2+ sequestering system different from that of high density vesicles and that Mg2+-dependent (basal) ATPase as well as the 57000 and 47000-Mr polypeptides are part of the Ca2+ transport system within the low density vesicles. According to the results from slow-twitch muscle, Ca2+ sequestration by the sarcoplasmic reticulum functions in this muscle type only through the low density vesicles." @default.
• W2056566634 created "2016-06-24" @default.
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• W2056566634 date "1977-12-01" @default.
• W2056566634 modified "2023-10-16" @default.
• W2056566634 title "ATPase Activities, Ca2+ Transport and Phosphoprotein Formation in Sarcoplasmic Reticulum Subfractions of Fast and Slow Rabbit Muscles" @default.
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• W2056566634 doi "https://doi.org/10.1111/j.1432-1033.1977.tb11943.x" @default.
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