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J. Biol. Chem., Vol. 277, Issue 44, 41473-41479, November 1, 2002
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From the In renal collecting ducts, a vasopressin-induced
cAMP increase results in the phosphorylation of aquaporin-2 (AQP2)
water channels at Ser-256 and its redistribution from intracellular vesicles to the apical membrane. Hormones that activate protein kinase
C (PKC) proteins counteract this process. To determine the role of the
putative kinase sites in the trafficking and hormonal regulation of
human AQP2, three putative casein kinase II (Ser-148, Ser-229,
Thr-244), one PKC (Ser-231), and one protein kinase A (Ser-256) site were altered to mimic a constitutively
non-phosphorylated/phosphorylated state and were expressed in
Madin-Darby canine kidney cells. Except for Ser-256 mutants, seven
correctly folded AQP2 kinase mutants trafficked as wild-type AQP2 to
the apical membrane via forskolin-sensitive intracellular vesicles.
With or without forskolin, AQP2-Ser-256A was localized in intracellular
vesicles, whereas AQP2-S256D was localized in the apical membrane.
Phorbol 12-myristate 13-acetate-induced PKC activation following
forskolin treatment resulted in vesicular distribution of all AQP2
kinase mutants, while all were still phosphorylated at Ser-256. Our
data indicate that in collecting duct cells, AQP2 trafficking to
vasopressin-sensitive vesicles is phosphorylation-independent, that
phosphorylation of Ser-256 is necessary and sufficient for expression
of AQP2 in the apical membrane, and that PMA-induced PKC-mediated
endocytosis of AQP2 is independent of the AQP2 phosphorylation state.
The Role of Putative Phosphorylation Sites in the Targeting and
Shuttling of the Aquaporin-2 Water Channel*
§,
§,
¶,
,
,

Department of Cell Physiology,
Nijmegen Center for Molecular Life Sciences, 6500 HB Nijmegen,
The Netherlands, the ¶ Department of Physiology and Pharmacology,
School of Biomedical Sciences, University of Queensland, Queensland
4072, Brisbane, Australia, the
Water and Salt Research Center,
University of Aarhus, DK-8000 Aarhus, Denmark, and the
** Department of Cell Biology, University of Utrecht, 3584 CX
Utrecht, The Netherlands
*
This work was supported by Dutch Organization of Scientific
Research Grant NWO-MW 902-18-092 (to P. M. T. D. and
P. v. d. S.), European Union Grant QLRT-2000-00778 (to
P. M. T. D.), the Danish National Research Foundation (to S. N.),
the Australian Research Council, the National Health and Medical
Research Council, and the University of Queensland (to D. M.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.

To whom correspondence should be addressed: 160, Dept. of Cell
Physiology, Research Tower, 7th Floor, UMC St. Radboud, P. O. Box
9101, 6500 HB Nijmegen, The Netherlands. Tel.: 31-243617347; Fax:
31-243616413; E-mail: p.deen@ncmls.kun.nl.
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