Component of the endosomal sorting complex required for transport II (ESCRT-II), which is required for multivesicular body (MVB) formation and sorting of endosomal cargo proteins into MVBs. The MVB pathway mediates delivery of transmembrane proteins into the lumen of the lysosome for degradation. The ESCRT-II complex is probably involved in the recruitment of the ESCRT-III complex. The ESCRT-II complex may also play a role in transcription regulation by participating in derepression of transcription by RNA polymerase II, possibly via its interaction with ELL. Required for degradation of both endocytosed EGF and EGFR, but not for the EGFR ligand-mediated internalization. Required for the exosomal release of SDCBP, CD63 and syndecan (By similarity). Component of the endosomal sorting complex required for transport II (ESCRT-II), composed of SNF8, VPS25 and VPS36. SNF8 is essential for the stability of the ESCRT-II complex. ESCRT-II interacts with ELL. Interacts with TSG101 (via the C-terminal domain). Interacts with RILPL1 (via the N-terminal domain); which recruits ESCRT-II to the endosome membranes. Interacts with 14-3-3 proteins (By similarity). Recruited to the endosome membrane to participate in vesicle formation. Belongs to the SNF8 family.