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Berrebi-Bertran, I. et al.

Berrebi-Bertran, Robert, Camelin, Bril, Souchet,

The gamma-subunit of (Na+,K+)-ATPase: a representative example of human single transmembrane protein with a key regulatory role.

The (Na+,K+)-ATPase is a plasma membrane protein complex composed of at least three subunits (alpha,beta,gamma) that couples the exchange of three cytoplasmic Na+ ions with two extracellular K+ ions, to the hydrolysis of one molecule ofATP in most animal cells. The gamma-subunit is a 66 residue membrane protein associated with the active alpha/beta binary complex. It can be considered as an archetype of single transmembrane proteins (type I) which may play a modulatory role upon association with functional membrane partners. This paper highlights similar associations observed with other ATPases such as the sarcoplasmic reticulum (SR) Ca2+-ATPase (SERCA1/SERCA 2a), but also with Cl- and/or K+ currents, ionic channels (HERG, KCNQ1) and G-protein coupled receptors (adrenomedullin, CGRP and calcitonin) which are of particular interest in the cardiovascular field. Here is reviewed the assessed or suggested regulatory role of a family of small plasma/SR associated membrane proteins including gamma-subunit, phospholemman, Mat 8, KCNE (type 1, 2 and 3), RAMP (type 1, 2 and 3), sarcolipin and phospholamban, mainly found in muscular and vascular tissues. These proteins are critical in controlling important biological processes which derive from specific associations with a binding partner and particular subcellular localizations.[1]

References

The gamma-subunit of (Na+,K+)-ATPase: a representative example of human single transmembrane protein with a key regulatory role. Berrebi-Bertran, I., Robert, P., Camelin, J.C., Bril, A., Souchet, M. Cell. Mol. Biol. (Noisy-le-grand) (2001) [Pubmed]

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