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Adenosine diphosphate binding to sodium-plus-potassium ion-dependent adenosine triphosphatase. The role of lipid in the nucleotide-potassium ion interplay.


ABSTRACT: Delipidated dogfish rectal-gland Na++K+-ATPase (Na++K+-dependent adenosine triphosphatase), almost devoid of hydrolytic activity, is able to bind about 2nmol of ADP/mg of protein. The "affinity" of delipidated enzyme for ADP is not affected by K+ in concentrations that greatly decrease the "affinity" of native Na++K+-ATPase. The K+-sensitivity of the ADP binding is in part restored by relipidation with dioleoyl phosphatidylcholine.

SUBMITTER: Jensen J 

PROVIDER: S-EPMC1164188 | biostudies-other | 1976 Dec

REPOSITORIES: biostudies-other

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