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ATP inactivates hydrolysis of the K+-sensitive phosphoenzyme of kidney Na+,K+-transport ATPase and activates that of muscle sarcoplasmic reticulum Ca2+-transport ATPase.

Abstract：

:In order to characterize low affinity ATP-binding sites of renal (Na+,K+) ATPase and sarcoplasmic reticulum (Ca2+)ATPase, the effects of ATP on the splitting of the K+-sensitive phosphoenzymes were compared. ATP inactivated the dephosphorylation in the case of (Na+,K+)ATPase at relatively high concentrations, while activating it in the case of (Ca2+)ATPase. When various nucleotides were tested in place of ATP, inactivators of (Na+,K+)ATPase were found to be activators in (Ca2+)ATPase, with a few exceptions. In the absence of Mg2+, the half-maximum concentration of ATP for the inhibition or for the activation was about 0.35 mM or 0.25 mM, respectively. These values are comparable to the previously reported Km or the dissociation constant of the low affinity ATP site estimated from the steady-state kinetics of the stimulation of ATP hydrolysis or from binding measurements. By increasing the concentration of Mg2+, but not Na+, the effect of ATP on the phosphoenzyme of (Na+,K+)ATPase was reduced. On the other hand, Mg2+ did not modify the effect of ATP on the phosphoenzyme of (Ca2+)ATPase. During (Na+,K+)ATPase turnover, the low affinity ATP site appeared to be exposed in the phosphorylated form of the enzyme, but the magnesium-complexed ATP interacted poorly with the reactive K+-sensitive phosphoenzyme, which has a tightly bound magnesium, probably because of interaction between the divalent cations. In the presence of physiological levels of Mg2+ and K+, ATP appeared to bind to the (Na+,K+)ATPase only after the dephosphorylation, while it binds to the (Ca2+)-ATPase before the dephosphorylation to activate the turnover.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Fukushima Y,Yamada S,Nakao M

doi

10.1093/oxfordjournals.jbchem.a134616

subject

Has Abstract

pub_date

1984-02-01 00:00:00

pages

359-68

issue

2

eissn

0021-924X

issn

1756-2651

journal_volume

95

pub_type

杂志文章

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