Parkinson disease (autosomal recessive, early onset) 7; Acts as a positive regulator of androgen receptor- dependent transcription. May function as a redox-sensitive chaperone and as a sensor for oxidative stress. Prevents aggregation of SNCA. Protects neurons against oxidative stress and cell death. Plays a role in fertilization. Has no proteolytic activity. Has cell-growth promoting activity and transforming activity (189 aa)