All three known Caveolin forms have the FEDVIAEP caveolin 'signature motif' within their hydrophilic N-terminal domain. Caveolin 2 (Cav-2) is co-localised and co-expressed with Cav-1/VIP21, forms heterodimers with it and needs Cav-1 for proper membrane localisation. Cav-3 has greater protein sequence similarity to Cav-1 than to Cav-2. Cellular processes caveolins are involved in include vesicular transport, cholesterol homeostasis, signal transduction, and tumour suppression [1].

1: The caveolin proteins. Williams TM, Lisanti MP; Genome Biol 2004;5:214. PMID:15003112