Predicted to enable guanyl-nucleotide exchange factor activity and serine-type peptidase activity. Predicted to be involved in proteolysis and regulation of ARF protein signal transduction. Predicted to be located in membrane. Is an ortholog of C. elegans gbf-1. In C. elegans, gbf-1 is involved in several processes, including endoplasmic reticulum organization; endosomal transport; and mitochondrion organization.