Enables serine-type endopeptidase activity. Predicted to be involved in lysosome organization; proteolysis; and regulation of vesicle-mediated transport. Predicted to act upstream of or within lipid metabolic process and protein import into nucleus. Located in Golgi apparatus. Human ortholog(s) of this gene implicated in spondyloepiphyseal dysplasia Kondo-Fu type. Orthologous to human MBTPS1 (membrane bound transcription factor peptidase, site 1). [provided by Alliance of Genome Resources, Apr 2022]