May act as a scaffolding protein within caveolar membranes. Interacts directly with G-protein alpha subunits and can functionally regulate their activity. Caveolin-2 may function as an accessory protein in conjunction with caveolin-1 (By similarity). Homodimer. Caveolin-1 and -2 colocalize and form a stable hetero-oligomeric complex (By similarity). Potential hairpin-like structure in the membrane. Membrane protein of caveolae (By similarity). Belongs to the caveolin family.