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Failure of calcium to stimulate Na,K-ATPase in the presence of EDTA.

作者信息

Powis D A

出版信息

Experientia. 1985 Aug 15;41(8):1048-51. doi: 10.1007/BF01952137.

DOI:10.1007/BF01952137
PMID:2990993
Abstract

The effect of calcium on Na,K-ATPase activity of rat brain homogenates and its modification by the chelating agent EDTA has been investigated. In the absence of EDTA, free calcium (approximately 10(-6) mol/l) stimulates Na,K-ATPase activity; in the presence of EDTA the same concentration of free calcium is without effect on the enzyme. In the absence of EDTA the stimulation by calcium of Na,K-ATPase activity is enhanced by the additional presence of calmodulin but in the presence of EDTA, even when calmodulin is added to excess, calcium still fails to stimulate the enzyme. The possibility that EDTA interferes with an interaction between a calcium-calmodulin complex and Na,K-ATPase is discussed.

摘要

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本文引用的文献

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