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Kunitz-type serine protease inhibitor homolog dendrotoxin B (DTX-B) (Venom basic protease inhibitor B)

 VKTHB_DENPO             Reviewed;          57 AA.
P00983;
21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
21-JUL-1986, sequence version 1.
22-NOV-2017, entry version 89.
RecName: Full=Kunitz-type serine protease inhibitor homolog dendrotoxin B;
Short=DTX-B;
AltName: Full=Venom basic protease inhibitor B;
Dendroaspis polylepis polylepis (Black mamba).
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata;
Toxicofera; Serpentes; Colubroidea; Elapidae; Elapinae; Dendroaspis.
NCBI_TaxID=8620;
[1]
PROTEIN SEQUENCE.
TISSUE=Venom;
PubMed=7309000;
Strydom D.J., Joubert F.J.;
"The amino acid sequence of a weak trypsin inhibitor B from
Dendroaspis polylepis polylepis (black mamba) venom.";
Hoppe-Seyler's Z. Physiol. Chem. 362:1377-1384(1981).
-!- FUNCTION: Highly selective blocker of voltage-gated potassium
channels (Kv). Inhibits trypsin weakly.
-!- SUBCELLULAR LOCATION: Secreted.
-!- TISSUE SPECIFICITY: Expressed by the venom gland.
-!- SIMILARITY: Belongs to the venom Kunitz-type family.
{ECO:0000305}.
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PIR; A01214; TIEPVB.
ProteinModelPortal; P00983; -.
SMR; P00983; -.
MEROPS; I02.056; -.
HOVERGEN; HBG006193; -.
GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
GO; GO:0004867; F:serine-type endopeptidase inhibitor activity; IEA:InterPro.
GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
CDD; cd00109; KU; 1.
Gene3D; 4.10.410.10; -; 1.
InterPro; IPR002223; Kunitz_BPTI.
InterPro; IPR036880; Kunitz_BPTI_sf.
InterPro; IPR020901; Prtase_inh_Kunz-CS.
Pfam; PF00014; Kunitz_BPTI; 1.
PRINTS; PR00759; BASICPTASE.
SMART; SM00131; KU; 1.
SUPFAM; SSF57362; SSF57362; 1.
PROSITE; PS00280; BPTI_KUNITZ_1; 1.
PROSITE; PS50279; BPTI_KUNITZ_2; 1.
1: Evidence at protein level;
Direct protein sequencing; Disulfide bond;
Ion channel impairing toxin; Neurotoxin;
Potassium channel impairing toxin; Secreted; Toxin;
Voltage-gated potassium channel impairing toxin.
CHAIN 1 57 Kunitz-type serine protease inhibitor
homolog dendrotoxin B.
/FTId=PRO_0000155435.
DOMAIN 5 55 BPTI/Kunitz inhibitor.
{ECO:0000255|PROSITE-ProRule:PRU00031}.
DISULFID 5 55 {ECO:0000255|PROSITE-ProRule:PRU00031}.
DISULFID 14 38 {ECO:0000255|PROSITE-ProRule:PRU00031}.
DISULFID 30 51 {ECO:0000255|PROSITE-ProRule:PRU00031}.
SEQUENCE 57 AA; 6476 MW; 5090338CD360800C CRC64;
RPYACELIVA AGPCMFFISA FYYSKGANKC YPFTYSGCRG NANRFKTIEE CRRTCVV


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