Predicted to enable ubiquitin-like protein ligase binding activity. Predicted to be involved in positive regulation of exosomal secretion; protein transport to vacuole involved in ubiquitin-dependent protein catabolic process via the multivesicular body sorting pathway; and regulation of extracellular exosome assembly. Predicted to act upstream of or within protein transport. Predicted to be located in intracellular membrane-bounded organelle. Predicted to be part of ESCRT-0 complex. Orthologous to human STAM (signal transducing adaptor molecule). [provided by Alliance of Genome Resources, Apr 2022]