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The plasma membrane (Mg2+)-dependent adenosine triphosphatase from the human erythrocyte is not an ion pump

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Summary

The plasma membrane (Mg2+)-dependent adenosine triphosphatase ((Mg2+)-ATPase) from human erythrocytes has been tested for its ability to transport ions. Using a preparation of inside-out vesicles loaded with the pH-sensitive fluorescence probe 1-hydroxypyrene-3,6,8-trisulfonic acid (HPTS), we have demonstrated the absence of proton movement during (Mg2+)-ATPase activity. From the rate of ATP hydrolysis and the passive proton permeability of these vesicles, an upper limit of 0.03 H+ transported per ATP hydrolyzed was calculated. To verify that proton pumping could be detected in this system, the intravesicular pH was monitored during (Ca2+)-dependent adenosine triphosphatase ((Ca2+)-ATPase) activity. Proton efflux associated with (Ca2+)-ATPase activity was observed (in agreement with a recent report of proton pumping by a reconstituted erythrocyte (Ca2+)-ATPase (Niggli, V., Sigel, E., Carafoli, E. (1982)J. Biol. Chem. 257:2350–2356)) and was shown to be stimulated by calmodulin. The ability of the (Mg2+)-ATPase to pump28Mg2+,35SO 2−4 and86Rb+ was also tested, with the results leading to the conclusion that the human erythrocyte enzyme does not function as an ion transport system.

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  1. Department of Biochemistry and Molecular Biology, Harvard University, 02138, Cambridge, Massachusetts

    Michael Forgac & Lewis Cantley

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  1. Michael Forgac
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  2. Lewis Cantley
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Forgac, M., Cantley, L. The plasma membrane (Mg2+)-dependent adenosine triphosphatase from the human erythrocyte is not an ion pump. J. Membrain Biol. 80, 185–190 (1984). https://doi.org/10.1007/BF01868774

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  • DOI: https://doi.org/10.1007/BF01868774

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