ID   VKTB_BUNCA              Reviewed;          83 AA.
AC   Q8AY42;
DT   16-JUN-2009, integrated into UniProtKB/Swiss-Prot.
DT   16-JUN-2009, sequence version 2.
DT   25-MAY-2022, entry version 50.
DE   RecName: Full=Kunitz-type serine protease inhibitor B;
DE   AltName: Full=Kunitz inhibitor B;
DE   Flags: Precursor;
OS   Bungarus candidus (Malayan krait).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC   Serpentes; Colubroidea; Elapidae; Bungarinae; Bungarus.
OX   NCBI_TaxID=92438;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   TISSUE=Venom gland;
RA   Tsai I.H., Wang Y.M., Hsu H.Y.;
RT   "Structural and functional genomics of Bungarus candidus.";
RL   Submitted (OCT-2001) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Serine protease inhibitor. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000250}.
CC   -!- TISSUE SPECIFICITY: Expressed by the venom gland.
CC   -!- SIMILARITY: Belongs to the venom Kunitz-type family. {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAL30069.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; AY057887; AAL30069.1; ALT_INIT; mRNA.
DR   AlphaFoldDB; Q8AY42; -.
DR   SMR; Q8AY42; -.
DR   MEROPS; I02.031; -.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
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   2: Evidence at transcript level;
KW   Disulfide bond; Protease inhibitor; Secreted; Serine protease inhibitor;
KW   Signal.
FT   SIGNAL          1..24
FT                   /evidence="ECO:0000250"
FT   CHAIN           25..83
FT                   /note="Kunitz-type serine protease inhibitor B"
FT                   /id="PRO_0000376872"
FT   DOMAIN          31..81
FT                   /note="BPTI/Kunitz inhibitor"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00031"
FT   SITE            41..42
FT                   /note="Reactive bond for chymotrypsin"
FT                   /evidence="ECO:0000250"
FT   DISULFID        31..81
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00031"
FT   DISULFID        40..64
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00031"
FT   DISULFID        56..77
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00031"
SQ   SEQUENCE   83 AA;  8919 MW;  ED74A220839DD4ED CRC64;
     MSSGGLLLLV GLLTLCAELT PVSSKDRPKF CNVPPEPGRC NANVRAFYYN PRLRKCIEFT
     YGGCGGNANN FKSGGECKRA CGE