VIP21-Caveolin is a component of the filamentous coat surrounding the
invaginations of the plasma membrane called caveolae. Unlike the vesic
ular coat proteins identified so far, VIP21-Caveolin can be classified
as an integral membrane protein. Furthermore, it is found in high mol
ecular mass oligomers. Based on its localisation in specialised membra
ne subdomains, a role for VIP21-Caveolin in membrane protein sorting h
as been proposed.