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Protein

Kunitz-type serine protease inhibitor homolog dendrotoxin I

Gene
N/A
Organism
Dendroaspis polylepis polylepis (Black mamba)
Status
Reviewed-Annotation score: Annotation score: 4 out of 5-Experimental evidence at protein leveli

Functioni

Serine protease inhibitor homolog that blocks voltage-gated potassium channels (Kv1.1/KCNA1, Kv1.2/KCNA2, and Kv1.6/KCNA6) (IC50=0.13-50 nM).1 Publication

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sitei5May be the major determinant of the binding affinity for potassium channels1
Sitei9Important for binding to potassium channels1
Sitei19Not important for inhibition of potassium channels1

GO - Molecular functioni

Complete GO annotation...

Keywords - Molecular functioni

Ion channel impairing toxin, Neurotoxin, Potassium channel impairing toxin, Toxin, Voltage-gated potassium channel impairing toxin

Names & Taxonomyi

Protein namesi
Recommended name:
Kunitz-type serine protease inhibitor homolog dendrotoxin I
Short name:
DTX-I
Alternative name(s):
Dendrotoxin-1
Venom basic protease inhibitor 1
OrganismiDendroaspis polylepis polylepis (Black mamba)
Taxonomic identifieri8620 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiLepidosauriaSquamataBifurcataUnidentataEpisquamataToxicoferaSerpentesColubroideaElapidaeElapinaeDendroaspis

Subcellular locationi

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Secreted

Pathology & Biotechi

Toxic dosei

LD50 is 38 mg/kg by intravenous injection.

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001554341 – 60Kunitz-type serine protease inhibitor homolog dendrotoxin IAdd BLAST60

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Disulfide bondi7 ↔ 57
Disulfide bondi16 ↔ 40
Disulfide bondi32 ↔ 53

Keywords - PTMi

Disulfide bond

Expressioni

Tissue specificityi

Expressed by the venom gland.

Structurei

Secondary structure

160
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi5 – 7Combined sources3
Beta strandi20 – 25Combined sources6
Beta strandi29 – 37Combined sources9
Beta strandi47 – 49Combined sources3
Helixi50 – 57Combined sources8

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1DEMNMR-A1-60[»]
1DENNMR-A1-60[»]
ProteinModelPortaliP00979.
SMRiP00979.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiP00979.

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini7 – 57BPTI/Kunitz inhibitorPROSITE-ProRule annotationAdd BLAST51

Sequence similaritiesi

Belongs to the venom Kunitz-type family.Curated
Contains 1 BPTI/Kunitz inhibitor domain.PROSITE-ProRule annotation

Phylogenomic databases

HOVERGENiHBG006193.

Family and domain databases

Gene3Di4.10.410.10. 1 hit.
InterProiIPR002223. Kunitz_BPTI.
IPR020901. Prtase_inh_Kunz-CS.
[Graphical view]
PfamiPF00014. Kunitz_BPTI. 1 hit.
[Graphical view]
PRINTSiPR00759. BASICPTASE.
SMARTiSM00131. KU. 1 hit.
[Graphical view]
SUPFAMiSSF57362. SSF57362. 1 hit.
PROSITEiPS00280. BPTI_KUNITZ_1. 1 hit.
PS50279. BPTI_KUNITZ_2. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

P00979-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
QPLRKLCILH RNPGRCYQKI PAFYYNQKKK QCEGFTWSGC GGNSNRFKTI
60
EECRRTCIRK
Length:60
Mass (Da):7,155
Last modified:April 1, 1993 - v2
Checksum:i94E5CD5609E7AD81
GO

Sequence databases

PIRiA01211. TIEPVI.

Cross-referencesi

Sequence databases

PIRiA01211. TIEPVI.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1DEMNMR-A1-60[»]
1DENNMR-A1-60[»]
ProteinModelPortaliP00979.
SMRiP00979.
ModBaseiSearch...
MobiDBiSearch...

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Phylogenomic databases

HOVERGENiHBG006193.

Miscellaneous databases

EvolutionaryTraceiP00979.

Family and domain databases

Gene3Di4.10.410.10. 1 hit.
InterProiIPR002223. Kunitz_BPTI.
IPR020901. Prtase_inh_Kunz-CS.
[Graphical view]
PfamiPF00014. Kunitz_BPTI. 1 hit.
[Graphical view]
PRINTSiPR00759. BASICPTASE.
SMARTiSM00131. KU. 1 hit.
[Graphical view]
SUPFAMiSSF57362. SSF57362. 1 hit.
PROSITEiPS00280. BPTI_KUNITZ_1. 1 hit.
PS50279. BPTI_KUNITZ_2. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiVKTH1_DENPO
AccessioniPrimary (citable) accession number: P00979
Entry historyi
Integrated into UniProtKB/Swiss-Prot: July 21, 1986
Last sequence update: April 1, 1993
Last modified: November 2, 2016
This is version 100 of the entry and version 2 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programAnimal Toxin Annotation Program
Annotation programChordata Protein Annotation Program

Miscellaneousi

Miscellaneous

Does not inhibit serine proteases.

Keywords - Technical termi

3D-structure, Direct protein sequencing

Documents

  1. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  2. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.