ID   VSPH4_TRIST             Reviewed;         260 AA.
AC   Q71QJ4;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   05-JUL-2004, sequence version 1.
DT   03-AUG-2022, entry version 66.
DE   RecName: Full=Snake venom serine protease homolog KN4;
DE   AltName: Full=Serine proteinase-like protein KN4;
DE   Flags: Precursor;
OS   Trimeresurus stejnegeri (Chinese green tree viper) (Viridovipera
OS   stejnegeri).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC   Serpentes; Colubroidea; Viperidae; Crotalinae; Trimeresurus.
OX   NCBI_TaxID=39682;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   TISSUE=Venom gland;
RA   Tsai I.-H., Wang Y.-M.;
RT   "Identification of geographic variations and cloning of venom proteins of
RT   Trimeresurus stejnegeri: serine proteases and phospholipases.";
RL   Submitted (JUN-2001) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Snake venom serine protease homolog that may act in the
CC       hemostasis system of the prey. {ECO:0000305}.
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000305|Ref.1}.
CC   -!- TISSUE SPECIFICITY: Expressed by the venom gland. {ECO:0000305|Ref.1}.
CC   -!- SIMILARITY: Belongs to the peptidase S1 family. Snake venom subfamily.
CC       {ECO:0000305}.
CC   -!- CAUTION: Lacks the conserved His at position 67, which is expected to
CC       be an active site residue. {ECO:0000305}.
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DR   EMBL; AF395763; AAQ02893.1; -; mRNA.
DR   AlphaFoldDB; Q71QJ4; -.
DR   SMR; Q71QJ4; -.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0004252; F:serine-type endopeptidase activity; IEA:InterPro.
DR   GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR   GO; GO:0006508; P:proteolysis; IEA:InterPro.
DR   CDD; cd00190; Tryp_SPc; 1.
DR   Gene3D; 2.40.10.10; -; 2.
DR   InterPro; IPR009003; Peptidase_S1_PA.
DR   InterPro; IPR043504; Peptidase_S1_PA_chymotrypsin.
DR   InterPro; IPR001314; Peptidase_S1A.
DR   InterPro; IPR001254; Trypsin_dom.
DR   InterPro; IPR033116; TRYPSIN_SER.
DR   Pfam; PF00089; Trypsin; 1.
DR   PRINTS; PR00722; CHYMOTRYPSIN.
DR   SMART; SM00020; Tryp_SPc; 1.
DR   SUPFAM; SSF50494; SSF50494; 1.
DR   PROSITE; PS50240; TRYPSIN_DOM; 1.
DR   PROSITE; PS00135; TRYPSIN_SER; 1.
PE   2: Evidence at transcript level;
KW   Disulfide bond; Glycoprotein; Hemostasis impairing toxin; Secreted;
KW   Serine protease homolog; Signal; Toxin.
FT   SIGNAL          1..18
FT                   /evidence="ECO:0000255"
FT   PROPEP          19..24
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000295829"
FT   CHAIN           25..260
FT                   /note="Snake venom serine protease homolog KN4"
FT                   /id="PRO_5000061215"
FT   DOMAIN          25..251
FT                   /note="Peptidase S1"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00274"
FT   CARBOHYD        83
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000255"
FT   CARBOHYD        123
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000255"
FT   CARBOHYD        124
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000255"
FT   CARBOHYD        156
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000255"
FT   CARBOHYD        172
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000255"
FT   CARBOHYD        253
FT                   /note="N-linked (GlcNAc...) asparagine"
FT                   /evidence="ECO:0000255"
FT   DISULFID        31..165
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00274"
FT   DISULFID        52..68
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00274"
FT   DISULFID        100..258
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00274"
FT   DISULFID        144..212
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00274"
FT   DISULFID        176..191
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00274"
FT   DISULFID        202..227
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00274"
SQ   SEQUENCE   260 AA;  28704 MW;  15665552E5528129 CRC64;
     MVLIRVLANL LILQLSYAQK SSELIIGGDE CNINEHRFLV ALYTFRSRRF HCGGTLINQE
     WVLSAARCDR KNIRIKLGMH STNVTNEDEQ RRVPKEKFFC LSSKTYTQWN KDIMLIRLNS
     PVNNSTHIAP LSLPSNPPFV GSVCRIMGWG TITSPNETYP DVPHCANINL FNYTVCHGAH
     AGLPATSRTL CAGVLEGGKD TCKGDSGGPL ICNGQFQGIV SWGGDPCAQP REPGVYTKVF
     DHLDWIQNII AGNTTATCPL