May play a role in spermatogenesis. May interact with ACTB and the syntaxin STX1A and/or STX1B. Localizes to the inner and outer membranes as well as to the matrix of the acrosome. Specifically expressed in testis by haploid germ cells. First detected at day 25 postpartum, the expression increases until day 35 and remains identical till adulthood. Belongs to the SPATA31 family. Truncated N-terminus.