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Proc Natl Acad Sci U S A. 2003 May 27;100(11):6511-6. Epub 2003 May 12.

The phosphorylation of caveolin-2 on serines 23 and 36 modulates caveolin-1-dependent caveolae formation.

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  • 1Department of Pharmacology, Vascular Cell Signaling and Therapeutics Program, Boyer Center for Molecular Medicine, Yale University School of Medicine, 295 Congress Avenue, New Haven, CT 06536, USA.

Abstract

Caveolin-1 and -2 are the two major coat proteins found in plasma membrane caveolae of most of cell types. Here, by using adenoviral transduction of either caveolin-1 or caveolin-2 or both isoforms into cells lacking both caveolins, we demonstrate that caveolin-2 positively regulates caveolin-1-dependent caveolae formation. More importantly, we show that caveolin-2 is phosphorylated in vivo at two serine residues and that the phosphorylation of caveolin-2 is necessary for its actions as a positive regulator of caveolin-1 during organelle biogenesis in prostate cancer cells. Mutation of the primary phosphorylation sites on caveolin-2, serine 23 and 36, reduces the number of plasmalemma-attached caveolae and increases the accumulation of noncoated vesicles, but does not affect trafficking of caveolin-2, interaction with caveolin-1 or its biophysical properties. Thus, the phosphorylation of caveolin-2 is a novel mechanism to regulate the dynamics of caveolae assembly.

PMID:
12743374
[PubMed - indexed for MEDLINE]
PMCID:
PMC164477
Free PMC Article
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