Role of GTP hydrolysis in fission of caveolae directly from plasma membranes.
Caveolae are specialized invaginated cell surface microdomains of undefined function. A cell-free system that reconstituted fission of caveolae from lung endothelial plasma membranes was developed. Addition of cytosol and the hydrolysis of guanosine triphosphate (GTP) induced caveolar fission. The budded caveolae were isolated as vesicles rich in caveolin and the sialoglycolipid GM1 but not glycosyl-phosphatidylinositol (GPI)-anchored proteins. These vesicles contained the molecular machinery for endocytosis and transcytosis. In permeabilized endothelial cells, GTP stimulated, whereas GTPgammaS prevented, caveolar budding and endocytosis of the cholera toxin B chain to endosomes. Thus, caveolae may bud to form discrete carrier vesicles that participate in membrane trafficking.
Schnitzer
J E
JE
Department of Pathology, Harvard Medical School, Beth Israel Hospital, Boston, MA 02215, USA. jschnitz@bih.harvard.edu
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D000818:Animals; D001692:Biological Transport; D002417:Cattle; D051242:Caveolin 1; D022461:Caveolins; D002462:Cell Membrane / Q000737:chemistry / Q000378:metabolism* / Q000648:ultrastructure; D002474:Cell-Free System; D002499:Centrifugation, Density Gradient; D002772:Cholera Toxin / Q000378:metabolism; D004705:Endocytosis; D004730:Endothelium, Vascular / Q000166:cytology / Q000378:metabolism; D016244:Guanosine 5'-O-(3-Thiotriphosphate) / Q000494:pharmacology; D006160:Guanosine Triphosphate / Q000378:metabolism* / Q000494:pharmacology; D006868:Hydrolysis; D008565:Membrane Proteins / Q000032:analysis / Q000378:metabolism; D051381:Rats
C495537:Cav1 protein, rat; D051242:Caveolin 1; D022461:Caveolins; D008565:Membrane Proteins; D016244:Guanosine 5'-O-(3-Thiotriphosphate); D006160:Guanosine Triphosphate; D002772:Cholera Toxin