Involved in transport from the ER to the Golgi apparatus as well as in intra-Golgi transport. It belongs to a super-family of proteins called t-SNAREs or soluble NSF (N-ethylmaleimide-sensitive factor) attachment protein receptor. Cooperates with ykt-6 for proper expression of Golgi-resident proteins. Required along with ykt-6 for normal embryonic development, seam cell division or differentiation, and ray formation. Component of several multiprotein Golgi SNARE complexes. Expressed in two-fold stage embryos in the lateral epithelial cells (seam cells) and continues throughout all larval stages. In adults, expression becomes faint in seam cells and strong in intestinal cells. Also weakly expressed in epithelial cells of the vulva. Overall, expression appears to be restricted to certain types of epithelial cells and changes with developmental stages. Reduction in brood size at adulthood. Abnormal tail structure, and loss of the T-cell derived rays, R7-R9, of the male-specific sensory rays, but ray sensory function remains intact. Combined with ykt-6 knock-down causes reduced seam cell leading to loss of ray phenotype. At cellular level, reduced expression of Golgi-resident proteins like mannosidase II, and more so in combination with ykt-6 knock-down. Belongs to the GOSR1 family.