By Sidney Fleischer
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Biochem. 62:285. , and Ebashi, S. (1967). J. Biochem. 61:531. , and Yamazaki, R. (1970). Proc. Japan Acad, 46:387. Kakiuchi, S. , and Nakajima, H. (1970). Proc. Japan Acad. 46:587. Y. (1970). Biochem. Biophys. Res. Commun. 38:533. THE SARCOPLASMIC RETICULUM CALCIUM PUMP: EARLY AND RECENT DEVELOPMENTS CRITICALLY OVERVIEWED Wilhelm Hasselbach, Bruno Agostini, Pankaj Medda, Andrea Migala, Wolfgang Waas Max-Planck-Institute of Medical Research Heidelberg, FR Germany I. INTRODUCTION In the last two decades the sarcoplasmic membrane system has become a central element in our concept of excitating contraction coupling (1, 2 ) .
One might suppose that calcium movement is directly coupled to the phosphotransfer reaction. Such a coupling is suggested by the observation showing that phosphoprotein formation and calcium translocation appear to occur simultaneously in initial rate measurements (6). Yet the nonexisting stoichiometry between calcium turnover and the exchange of phosphate between NTP and NDP rather contra dict such a coupling. Furthermore, if phosphoprotein formation would directly lead to calcium translocation an affinity reduction of the phosphoprotein for calcium by 3 or 4 orders of magnitude must occur.
The latter dis covery resulted from experiments conducted by Barlogie with the intention to find conditions under which a rapid calcium release could be induced (36, 37). The efficiency of the pump is therefore given by the following expression n = 2 · In Caj/Ca/ln Keq · ATP/ADP · P, which relates the osmotic work per mole of ATP hydrolyzed to the available free energy. As shown in the following table 1, the efficiency of the pump in the isolated vesicles approaches values near one. , Ca and the ATP potential are used (38 - 42).
Structure and Function of Sarcoplasmic Reticulum by Sidney Fleischer