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Originally published In Press as doi:10.1074/jbc.R100023200 on June 12, 2001
J. Biol. Chem., Vol. 276, Issue 32, 29617-29620, August 10, 2001
MINIREVIEW
Ion Pumps in Polarized Cells: Sorting and Regulation of the
Na+,K+- and
H+,K+-ATPases*
Lisa A.
Dunbar and
Michael J.
Caplan
From the Department of Cellular and Molecular Physiology, Yale
University School of Medicine, New Haven, Connecticut 06510
The physiologic function of an ion transport
protein is determined, in part, by its subcellular localization and by
the cellular mechanisms that modulate its activity. The
Na+,K+-ATPase and the
H+,K+-ATPases are closely related members of
the P-type family of ion transporting ATPases. Despite their homology,
these pumps are sorted to different domains in polarized epithelial
cells, and their enzymatic activities are subject to distinct
regulatory pathways. The molecular signals responsible for these
properties have begun to be elucidated. It appears that a complex array
of inter- and intramolecular interactions govern trafficking,
distribution, and catalytic capacities of these proteins.
*
This minireview will be reprinted
in the 2001 Minireview Compendium, which
will be available in December, 2001. This is the second article of two in the "Transport
ATPase Trafficking Minireview Series." Work from the authors'
laboratory presented here is supported by National Institutes of Health
Grants GM-42136 and DK-17433.
To whom correspondence should be addressed: Dept. of Cellular and
Molecular Physiology, Yale University School of Medicine, 333 Cedar
St., New Haven, CT 06510. Tel.: 203-785-7316; Fax: 203-785-4951; E-mail: michael.caplan@yale.edu.
Copyright © 2001 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2001 by the American Society for Biochemistry and Molecular Biology.
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