Golgi membrane protein involved in vesicular trafficking and spindle migration. Interacts with YIP5. The VTT domain was previously called the SNARE-assoc domain. As there is no evidence that this domain associates with SNARE proteins, it was renamed as VMP1, TMEM41, and TVP38 (VTT) domain. Present with 11300 molecules/cell in log phase SD medium. Belongs to the TVP38/TMEM64 family.