ID   VKT1_BITGA              Reviewed;          90 AA.
AC   Q6T6T5;
DT   16-JUN-2009, integrated into UniProtKB/Swiss-Prot.
DT   05-JUL-2004, sequence version 1.
DT   25-MAY-2022, entry version 49.
DE   RecName: Full=Kunitz-type serine protease inhibitor bitisilin-1;
DE   AltName: Full=BG-11;
DE   AltName: Full=Kunitz protease inhibitor 1;
DE   Flags: Precursor;
OS   Bitis gabonica (Gaboon adder) (Gaboon viper).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC   Serpentes; Colubroidea; Viperidae; Viperinae; Bitis.
OX   NCBI_TaxID=8694;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA], AND PROTEIN SEQUENCE OF 25-43.
RC   TISSUE=Venom, and Venom gland;
RX   PubMed=15276202; DOI=10.1016/j.gene.2004.03.024;
RA   Francischetti I.M.B., My-Pham V., Harrison J., Garfield M.K.,
RA   Ribeiro J.M.C.;
RT   "Bitis gabonica (Gaboon viper) snake venom gland: toward a catalog for the
RT   full-length transcripts (cDNA) and proteins.";
RL   Gene 337:55-69(2004).
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}.
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DR   EMBL; AY430402; AAR24526.1; -; mRNA.
DR   AlphaFoldDB; Q6T6T5; -.
DR   SMR; Q6T6T5; -.
DR   MEROPS; I02.062; -.
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   1: Evidence at protein level;
KW   Direct protein sequencing; Disulfide bond; Protease inhibitor; Secreted;
KW   Serine protease inhibitor; Signal.
FT   SIGNAL          1..24
FT                   /evidence="ECO:0000269|PubMed:15276202"
FT   CHAIN           25..90
FT                   /note="Kunitz-type serine protease inhibitor bitisilin-1"
FT                   /id="PRO_0000376868"
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 trypsin"
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   90 AA;  9923 MW;  1C4895CA42B467AF CRC64;
     MSSGGLLLLL GLLTLWAELT PVSGKNRPEF CNLPADTGPC KAYEPRFYYD SVSKECQKFT
     YGGCKGNSNN FESMDECRKT CVASATRRPT