Possesses a trypsin-like cleavage specificity with a preference for poly-basic substrates. Stimulates epithelial sodium channel (ENaC) activity through activating cleavage of the gamma subunits (SCNN1G). {ECO:0000269|PubMed:15246975, ECO:0000269|PubMed:15474520}. This is the function of PRSS8 (serine protease 8, ENSG00000052344).