ID   ISC3_BOMMO              Reviewed;          63 AA.
AC   P07481;
DT   01-APR-1988, integrated into UniProtKB/Swiss-Prot.
DT   01-APR-1988, sequence version 1.
DT   25-MAY-2022, entry version 84.
DE   RecName: Full=Chymotrypsin inhibitor SCI-III;
OS   Bombyx mori (Silk moth).
OC   Eukaryota; Metazoa; Ecdysozoa; Arthropoda; Hexapoda; Insecta; Pterygota;
OC   Neoptera; Endopterygota; Lepidoptera; Glossata; Ditrysia; Bombycoidea;
OC   Bombycidae; Bombycinae; Bombyx.
OX   NCBI_TaxID=7091;
RN   [1]
RP   PROTEIN SEQUENCE.
RC   TISSUE=Larval hemolymph;
RA   Sasaki T.;
RT   "Amino acid sequence of a novel Kunitz-type chymotrypsin inhibitor from
RT   hemolymph of silkworm larvae, Bombyx mori.";
RL   FEBS Lett. 168:227-230(1984).
CC   -!- FUNCTION: Inhibits chymotrypsin and thus avoids the accidental
CC       chymotrypsin-mediated activation of prophenoloxidase. This enzyme is
CC       required by the insect immune system to produce melanin which is used
CC       to engulf foreign objects.
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DR   PIR; A25740; TIMTC3.
DR   AlphaFoldDB; P07481; -.
DR   SMR; P07481; -.
DR   MEROPS; I02.018; -.
DR   Proteomes; UP000005204; Unassembled WGS sequence.
DR   GO; GO:0004867; F:serine-type endopeptidase inhibitor activity; IEA:UniProtKB-KW.
DR   CDD; cd00109; KU; 1.
DR   Gene3D; 4.10.410.10; -; 1.
DR   InterPro; IPR002223; Kunitz_BPTI.
DR   InterPro; IPR036880; Kunitz_BPTI_sf.
DR   InterPro; IPR020901; Prtase_inh_Kunz-CS.
DR   Pfam; PF00014; Kunitz_BPTI; 1.
DR   PRINTS; PR00759; BASICPTASE.
DR   SMART; SM00131; KU; 1.
DR   SUPFAM; SSF57362; SSF57362; 1.
DR   PROSITE; PS00280; BPTI_KUNITZ_1; 1.
DR   PROSITE; PS50279; BPTI_KUNITZ_2; 1.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Disulfide bond; Protease inhibitor;
KW   Reference proteome; Serine protease inhibitor.
FT   CHAIN           1..63
FT                   /note="Chymotrypsin inhibitor SCI-III"
FT                   /id="PRO_0000155423"
FT   DOMAIN          10..61
FT                   /note="BPTI/Kunitz inhibitor"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00031"
FT   SITE            21..22
FT                   /note="Reactive bond"
FT                   /evidence="ECO:0000250"
FT   DISULFID        10..61
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00031"
FT   DISULFID        20..44
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00031"
FT   DISULFID        36..57
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00031"
SQ   SEQUENCE   63 AA;  7118 MW;  977BD3C822DBA89B CRC64;
     DEPTTDLPIC EQAFGDAGLC FGYMKLYSYN QETKNCEEFI YGGCQGNDNR FSTLAECEQK
     CIN