Download Current Topics in Membranes and Transport, Vol. 3 by Felix Bronner, Arnost Kleinzeller (Eds.) PDF

By Felix Bronner, Arnost Kleinzeller (Eds.)

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Detailed presentations and discussions of kinetic or descriptive models, applied to the sodium pump, have been presented (Jardetzky, 1966; Barnett, 1970; Caldwell, 1968; Finkelstein, 1964; Glynn and Lew, 1969; Middleton, 1970; Opit and Charnock, 1965; Rapoport, 1970; Stone, 1968; Volkenstein and Fishman, 1970). Any mechanism proposed for the sodium pump must explain reactions other than those realized by forward operation of the pump. One of the most intriguing is a reversal of the pump such that sodium influx and potassium efflux are coupled to phosphorylation of ADP by inorganic phosphate.

1967) found that while hydroxylamine caused a breakdown of E-I>-T, it stimulated hydrolysis. They suggested that the hydroxylamine effect is similar to the potassium effect. Schoner et al. (1966) and Chignell and Titus (1966) found that although hydroxylamine does induce hydrolysis of E-P-321’, it neither inhibits nor stimulates ATP hydrolysis. Bader and Broom (1967) and Bader et al. (1970) found that hydroxylamine did inhibit Na+, I<+-ATPase activity but only if low amounts of calcium were present.

LINDENMAYER, AND JULIUS C. ALLEN tions. 5 for lamb (Barnett, 1970) and calf brain preparations (Lindenmayer, 1970). These values are close to the ratio of 1 pmole of E-P-32Pformed per unit of enzyme activity as reported by Post et al. (1965). These data initially suggested that digitalis bound to and stabilized a phosphorylated intermediate. Albers et al. (1968) showed that the glycoside-receptor complex was quite stable a t low temperatures and a t higher pH values. As the temperature was raised toward 37"C, or the pH lowered to 6, the complex, however, manifested increasing reversibility.

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