Is an ortholog of human UBXN1 (UBX domain protein 1). Exhibits K48-linked polyubiquitin modification-dependent protein binding activity. Is involved in masculinization of hermaphroditic germ-line\; positive regulation of cellular protein catabolic process\; and spermatogenesis. Localizes to the perinuclear region of cytoplasm. Is expressed in several tissues including the gonad.