This group represents type II transmembrane serine proteases or TTSPs that belong to MEROPS peptidase family S1A (clan PA(S)). They proteolytically activate membrane fusion activity of the hemagglutinin of highly pathogenic avian influenza viruses and induce their multicycle replication.
Taxonomy/Path:
InterPro : Peptidase S1A, chymotrypsin family / Peptidase S1A, TMPRSS13