Abstract
Reports on the ultrastructure of cells as well as biochemical data have, for several years, been indicating a connection between caveolae and the actin cytoskeleton. Here, using a yeast two-hybrid approach, we have identified the F-actin cross-linking protein filamin as a ligand for the caveolae-associated protein caveolin-1. Binding of caveolin-1 to filamin involved the N-terminal region of caveolin-1 and the C terminus of filamin close to the filamin-dimerization domain. In in vitro binding assays, recombinant caveolin-1 bound to both nonmuscle and muscle filamin, indicating that the interaction might not be cell type specific. With the use of confocal microscopy, colocalization of caveolin-1 and filamin was observed in elongated patches at the plasma membrane. Remarkably, when stress fiber formation was induced with Rho-stimulating Escherichia coli cytotoxic necrotizing factor 1, the caveolin-1–positive structures became coaligned with stress fibers, indicating that there was a physical link connecting them. Immunogold double-labeling electron microscopy confirmed that caveolin-1–labeled racemose caveolae clusters were positive for filamin. The actin network, therefore, seems to be directly involved in the spatial organization of caveolin-1–associated membrane domains.
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Dates
Type | When |
---|---|
Created | 12 years, 1 month ago (July 2, 2013, 7:39 p.m.) |
Deposited | 3 years, 5 months ago (Feb. 26, 2022, 9:39 p.m.) |
Indexed | 1 month, 3 weeks ago (July 2, 2025, 3:10 p.m.) |
Issued | 25 years, 7 months ago (Jan. 1, 2000) |
Published | 25 years, 7 months ago (Jan. 1, 2000) |
Published Print | 25 years, 7 months ago (Jan. 1, 2000) |
@article{Stahlhut_2000, title={Identification of Filamin as a Novel Ligand for Caveolin-1: Evidence for the Organization of Caveolin-1–associated Membrane Domains by the Actin Cytoskeleton}, volume={11}, ISSN={1939-4586}, url={http://dx.doi.org/10.1091/mbc.11.1.325}, DOI={10.1091/mbc.11.1.325}, number={1}, journal={Molecular Biology of the Cell}, publisher={American Society for Cell Biology (ASCB)}, author={Stahlhut, Martin and van Deurs, Bo}, editor={Guidotti, Guido}, year={2000}, month=jan, pages={325–337} }