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THE LOCALIZATION OF Mg-Na-K-ACTIVATED ADENOSINE TRIPHOSPHATASE ON RED CELL GHOST MEMBRANES

THE LOCALIZATION OF Mg-Na-K-ACTIVATED ADENOSINE TRIPHOSPHATASE ON RED CELL GHOST MEMBRANES The lead salt method introduced by Wachstein and Meisel (12) for the cytochemical demonstration of ATPase activity was modified and used to determine sites of activity on red cell ghost membranes. Preliminary studies showed that aldehyde fixation and standard concentrations of the capture reagent Pb(NO 3 ) 2 resulted in marked inhibition of the ATPase activity of these membranes. By lowering the concentration of Pb 2+ and incubating unfixed red cell ghosts, over 50% of the total ATPase activity, which included an ouabain-sensitive, Na-K-activated component, could be demonstrated by quantitative biochemical assay. Cytochemical tests, carried out under the same conditions, gave a reaction product localized exclusively along the inner surfaces of the ghost membranes for both Mg-ATPase and Na-K-ATPase. These findings indicate that the ATPase activity of red cell ghosts results in the release of P i on the inside of the ghost membrane at sites scattered over its inner aspect. There were no deposits of reaction product on the outer surface of the ghost membrane, hence no indication that upon ATP hydrolysis P i is released outside the ghosts. Nor was there any clear difference in the localization of reaction product of Mg-ATPase as opposed to that of Na-K-ATPase. Footnotes Submitted: 20 March 1967 Accepted: 28 July 1967 Revision received 28 July 1967 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Cell Biology Rockefeller University Press

THE LOCALIZATION OF Mg-Na-K-ACTIVATED ADENOSINE TRIPHOSPHATASE ON RED CELL GHOST MEMBRANES

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Publisher
Rockefeller University Press
Copyright
© 1967 Rockefeller University Press
ISSN
0021-9525
eISSN
1540-8140
DOI
10.1083/jcb.35.2.385
Publisher site
See Article on Publisher Site

Abstract

The lead salt method introduced by Wachstein and Meisel (12) for the cytochemical demonstration of ATPase activity was modified and used to determine sites of activity on red cell ghost membranes. Preliminary studies showed that aldehyde fixation and standard concentrations of the capture reagent Pb(NO 3 ) 2 resulted in marked inhibition of the ATPase activity of these membranes. By lowering the concentration of Pb 2+ and incubating unfixed red cell ghosts, over 50% of the total ATPase activity, which included an ouabain-sensitive, Na-K-activated component, could be demonstrated by quantitative biochemical assay. Cytochemical tests, carried out under the same conditions, gave a reaction product localized exclusively along the inner surfaces of the ghost membranes for both Mg-ATPase and Na-K-ATPase. These findings indicate that the ATPase activity of red cell ghosts results in the release of P i on the inside of the ghost membrane at sites scattered over its inner aspect. There were no deposits of reaction product on the outer surface of the ghost membrane, hence no indication that upon ATP hydrolysis P i is released outside the ghosts. Nor was there any clear difference in the localization of reaction product of Mg-ATPase as opposed to that of Na-K-ATPase. Footnotes Submitted: 20 March 1967 Accepted: 28 July 1967 Revision received 28 July 1967

Journal

The Journal of Cell Biology – Rockefeller University Press

Published: Nov 1, 1967

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