CHMP4B is a member of the chromatin-modifying protein/charged multivesicular body protein (CHMP) protein family. The protein is part of the endosomal sorting complex required for transport (ESCRT) complex III (ESCRT-III), which functions in the sorting of endocytosed cell-surface receptors into multivesicular endosomes. The ESCRT machinery also functions in the final abscisson stage of cytokinesis and in the budding of enveloped viruses such as HIV-1. The three proteins of the CHMP4 subfamily interact with programmed cell death 6 interacting protein (PDCD6IP, also known as ALIX), which also functions in the ESCRT pathway. The CHMP4 proteins assemble into membrane-attached 5-nm filaments that form circular scaffolds and promote or stabilize outward budding. These polymers are proposed to help generate the luminal vesicles of multivesicular bodies.
Charged multivesicular body protein 4b; CHMP4b; chromatin modifying protein 4B; Chromatin-modifying protein 4b; hSnf7-2; hVps32-2; SNF7 homolog associated with Alix 1; Snf7 homologue associated with Alix 1; SNF7-2; Vacuolar protein sorting-associated protein 32-2; vacuolar protein-sorting-associated protein 32-2; Vps32-2