Predicted to enable ubiquitin binding activity. Predicted to be involved in ubiquitin-dependent protein catabolic process via the multivesicular body sorting pathway. Predicted to act upstream of or within protein transport. Predicted to be located in cytosol; intracellular membrane-bounded organelle; and plasma membrane. Predicted to be part of ESCRT I complex. Human ortholog(s) of this gene implicated in hereditary spastic paraplegia. Orthologous to human UBAP1 (ubiquitin associated protein 1). [provided by Alliance of Genome Resources, Apr 2022]