InterPro domain: IPR007143

The Endosomal Sorting Complex Required for Transport (ESCRT) complexes form the machinery driving protein sorting from endosomes to lysosomes. ESCRT complexes are central to receptor down-regulation, lysosome biogenesis, and budding of HIV. Yeast ESCRT-I consists of three protein subunits, Vps23, Vps28, and Vps37. In humans, ESCRT-I comprises TSG101, VPS28, and one of four potential human VPS37 homologues. The main role of ESCRT-I is to recognise ubiquitinated cargo via the UEV domain of the VPS23/TSG101 subunit. The assembly of the ESCRT-I complex is directed by the C-terminal steadiness box (SB) of VPS23, the N-terminal half of VPS28, and the C-terminal half of VPS37. The structure is primarily composed of three long, parallel helical hairpins, each corresponding to a different subunit. The additional domains and motifs extending beyond the core serve as gripping tools for ESCRT-I critical functions [ 1 , 2 ].

1. ESCRT-I core and ESCRT-II GLUE domain structures reveal role for GLUE in linking to ESCRT-I and membranes. Cell 125, 99-111
2. Structural and functional organization of the ESCRT-I trafficking complex. Cell 125, 113-26