Is an ortholog of human STUB1 (STIP1 homology and U-box containing protein 1). Exhibits several functions, including Hsp70 protein binding activity\; chaperone binding activity\; and ubiquitin protein ligase binding activity. Is involved in several processes, including determination of adult lifespan\; locomotion\; and protein ubiquitination. Localizes to the cytoplasm. Is expressed in several tissues, including the alimentary system\; the copulatory spicule\; the hypodermis\; the nervous system\; and the reproductive system. Is used to study Duchenne muscular dystrophy. Human ortholog(s) of this gene are implicated in autosomal recessive spinocerebellar ataxia 16.