Required for the sorting and concentration of proteins resulting in the entry of these proteins into the invaginating vesicles of the multivesicular body (MVB). Acts a component of the ESCRT-III complex, which appears to be critical for late steps in MVB sorting, such as membrane invagination and final cargo sorting and recruitment of late-acting components of the sorting machinery. The MVB pathway requires the sequential function of ESCRT-O, -I,-II and -III complex assemblies. Can directly stimulate VPS4 ATPase activity. The DID4/VPS2-VPS24 subcomplex is required for the VPS4-dependent dissociation of ESCRT-III. Core component of the ESCRT-III complex (endosomal sorting required for transport complex III). ESCRT-III appears to be sequentially assembled as a flat lattice on the endosome membrane and forms a transient 450 kDa complex that contains DID4, oligomerized SNF7, VPS20 and VPS24. SNF7 oligomerization into a membrane-associated filament is nucleated by association of SNF7 with VPS20; the process is terminated through association of VPS24, possibly by capping the SNF7 filament. VPS24 subsequently associates with DID4/VPS2. Belongs to the SNF7 family.