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. 1966 May;99(2):404–412. doi: 10.1042/bj0990404

Separation of adenosine diphosphate-adenosine triphosphate–exchange activity from the cerebral microsomal sodium-plus-potassium ion-stimulated adenosine triphosphatase

W L Stahl 1,*, A Sattin 1,†, H McIlwain 1
PMCID: PMC1265009  PMID: 4223577

Abstract

1. A microsomal fraction from ox cerebral cortex catalysed [14C]ADP–ATP exchange at a speed similar to that at which it liberated Pi from ATP in the presence of Na+, K+ and Mg2+. 2. Repeated washing the fraction with MgATP solutions solubilized most of the exchange activity and left the adenosine triphosphatase insoluble and little changed in activity. The exchange activity was accompanied by negligible adenosine-triphosphatase activity and was enriched by precipitation at chosen pH and by DEAE-Sephadex. At no stage was its activity affected by Na+, K+ or ouabain. 3. The washed microsomal fraction was exposed to a variety of reagents; a sodium iodide–cysteine treatment increased both adenosine-triphosphatase and exchange activities, as also did a synthetic zeolite. Preparations were obtained with exchange activities less than 3% of their Na+-plus-K+-stimulated adenosine-triphosphatase activity. Some contribution to the residual exchange activity was made by an adenylate kinase. 4. Thus over 95% of the microsomal ADP–ATP-exchange activity does not take part in the Na+-plus-K+-stimulated adenosine-triphosphatase reaction. Participation of some of the residual 3% of the ADP–ATP-exchange activity has not been excluded, but there appears no firm evidence for its participation in the adenosine triphosphatase; the bearing of this conclusion on mechanisms proposed for the Na+-plus-K+-stimulated adenosine triphosphatase is indicated.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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