Abstract
IT is believed that muscle contracts or relaxes depending on the concentration of calcium in the sarcoplasm: when the concentration rises to some required level the muscle contracts; when it falls below this level the muscle relaxes1–4. The sarcoplasmic reticulum, which can take up calcium actively, seems to play a major part in controlling the level of calcium available to the contractile protein5–7.
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References
Heilbrunn, L. V., and Wiercinski, F. J., J. Cell. Comp. Physiol., 29, 15 (1957).
Niedergerke, R., J. Physiol., 128, 12P (1955).
Podolsky, R. J., and Hubert, C. E., Fed. Proc., 20, 301 (1961).
Portzehl, H., Caldwell, P. C., and Ruegg, J. C., Biochim. Biophys. Acta, 79, 581 (1964).
Ebashi, S., Arch. Biochem. Biophys., 76, 410 (1958).
Hasselbach, W., and Makinose, M., Biochem. Z., 333, 519 (1961).
Ebashi, S., and Lipmann, F., J. Cell. Biol., 14, 389 (1962).
Szent-Györgyi, A., Chemistry of Muscular Contraction (Academic Press, New York, 1951).
Weber, A., and Hertz, R., Biochem. Biophys. Res. Comm., 6, 364 (1961).
Weber, A., and Hertz, R., J. Biol. Chem., 238, 599 (1963).
Ebashi, S., J. Biochem., 50, 236 (1961).
Levy, H. M., and Fleisher, M., Biochim. Biophys. Acta (in the press).
Morales, M. F., and Hotta, K., J. Biol. Chem., 235, 1979 (1960).
Blum, J. J., Arch. Biochem. Biophys., 87, 104 (1960).
Murayama, K., and Gergely, J., J. Biol. Chem., 237, 1100 (1962).
Bendall, J. R., J. Physiol., 121, 232 (1953).
Ebashi, S., Nature, 200, 1010 (1963).
Ebashi, S., and Ebashi, F., Nature, 203, 646 (1964).
Bendall, J. R., and Davey, C. L., Biochim. Biophys. Acta, 26, 93 (1957).
Tonomura, Y., and Yoshimura, J., Arch. Biochem. Biophys., 90, 73 (1960).
Hasselbach, W., Z. Naturforsch., 7b, 163 (1952).
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LEVY, H., RYAN, E. Evidence that Calcium activates the Contraction of Actomyosin by overcoming Substrate Inhibition. Nature 205, 703–705 (1965). https://doi.org/10.1038/205703b0
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DOI: https://doi.org/10.1038/205703b0
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