evidence is presented , based on sequence comparison and secondary structure prediction , of structural and evolutionary relationship between chymotrypsin-like serine proteases , cysteine proteases of positive strand rna viruses ( 3c proteases of picornaviruses and related enzymes of como- , nepo- and potyviruses ) and putative serine protease of a sobemovirus .
C0055673
chymotrypsin-like
C0036734
serine protease