Structure/function studies of the gamma subunit of the Na,K-ATPase.

Abstract:

:The Na,K-ATPase gamma subunit is present primarily in kidney as two splice variants, gammaa and gammab, which differ only at their extracellular N-termini. Two distinct effects of gamma are seen in biochemical Na,K-ATPase assays of mammalian (HeLa) cells transfected with gammaa or gammab, namely, (i) a decrease in K'(ATP) probably secondary to a shift in steady-state E(1) <--> E(2) poise in favor of E(1) and (ii) an increase in cytoplasmic K(+)/Na(+) antagonism seen as an increase in K'(Na) at high K(+) concentration. Mutagenesis experiments involving alterations in extramembranous regions of gamma indicate that different regions mediate the aforementioned distinct effects and that the effects appear to be long range. Studies of ouabain-sensitive fluxes with intact cells confirm the gamma effects seen with membranes and also suggest an additional effect (increase) in apparent affinity for extracellular K(+). Alteration in gamma function was also evidenced in the behavior of a G41 -->R mutation within the transmembrane domain of gamma. G41R is associated with autosomal dominant renal magnesium wasting. Our studies show that this mutation in the gammab variant retards trafficking of gamma, but not alphabeta pumps, to the cell surface and abolishes functional effects of gamma, consistent with the conclusion that the Mg(2+) transport defect is secondary to loss of gamma modulation of Na,K-ATPase function.

journal_name

Ann N Y Acad Sci

authors

Blostein R,Pu HX,Scanzano R,Zouzoulas A

doi

10.1111/j.1749-6632.2003.tb07224.x

subject

Has Abstract

pub_date

2003-04-01 00:00:00

pages

420-7

eissn

0077-8923

issn

1749-6632

journal_volume

986

pub_type

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