Cystatin-SN (Cystain-SA-I) (Cystatin-1) (Salivary cystatin-SA-1)
1_MAQYL 6_ STLLL 11_ LLATL 16_ AVALA 21_ WSPKE 26_ EDRII 31_ PGGIY 36_ NADLN 41_ DEWVQ 46_ RALHF 51_ AISEY 56_ NKATK 61_ DDYYR 66_ RPLRV 71_ LRARQ 76_ QTVGG 81_ VNYFF 86_ DVEVG 91_ RTICT 96_ KSQPN 101_ LDTCA 106_ FHEQP 111_ ELQKK 116_ QLCSF 121_ EIYEV 126_ PWENR 131_ RSLVK 136_SRCQE
1: Human saliva appears to contain several cysteine proteinase inhibitors that are immunologically related to cystatin S but that differ in their specificity due to amino acid sequence differences. Cystatin SN, with a pI of 7.5, is a much better inhibitor of papain and dipeptidyl peptidase I than is cystatin S, although both inhibit ficin equally well