Involved in the early secretory pathway. Required for the correct export of secretory products from the endoplasmic reticulum (ER) and involved in the maintenance of ER integrity. Belongs to the VMP1 family. The predicted gene At4g14950 has been split into 2 genes: At4g14950 and At4g14965. The predicted gene At4g14950 has been split into 2 genes: At4g14950 and At4g14965.