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J Biol Chem. 2002 May 31;277(22):19946-51. Epub 2002 Mar 11.

Clustering induces redistribution of syndecan-4 core protein into raft membrane domains.

Author information

  • 1Angiogenesis Research Center and Section of Cardiology, Department of Medicine, Dartmouth Medical School, Lebanon, New Hampshire 03756, USA.

Erratum in

  • J Biol Chem 2002 Sep 20;277(38):35778.

Abstract

Syndecan-4 is a heparan sulfate-carrying core protein that has been directly implicated in fibroblast growth factor 2 (FGF2) signaling. Recent studies have suggested that many signaling proteins localize to the raft compartment of the plasma cell membrane. To establish whether syndecan-4 is present in the raft compartment, we have studied the distribution of the core protein and an Fc receptor (FcR)-syndecan-4 chimera prior to and following clustering with FGF2 or antibodies. Whereas unclustered syndecan-4 was present predominantly in the non-raft membrane compartment, clustering induced extensive syndecan-4 redistribution to the rafts as demonstrated by the sucrose gradient centrifugation and life confocal microscopy. Although syndecan-4 and caveolin-1 moved in tandem, syndecan-4 was not present in caveolae, a major subset of raft compartments. We conclude that syndecan-4 clustering induces its redistribution to the non-caveolae raft compartment. This process may play an important role in syndecan-4-mediation of FGF2 signaling.

PMID:
11889131
DOI:
10.1074/jbc.M200841200
[PubMed - indexed for MEDLINE]
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