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Protein

Potassium channel toxin alpha-KTx 5.1

Gene
N/A
Organism
Leiurus quinquestriatus hebraeus (Yellow scorpion)
Status
Reviewed-Annotation score: Annotation score: 3 out of 5-Experimental evidence at protein leveli

Functioni

Blocker for the small conductance calcium-activated potassium channels (SK-Ca); also known as apamine-sensitive potassium channel.

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Calcium-activated potassium channel impairing toxin, Ion channel impairing toxin, Neurotoxin, Potassium channel impairing toxin, Toxin

Names & Taxonomyi

Protein namesi
Recommended name:
Potassium channel toxin alpha-KTx 5.1
Alternative name(s):
Leiurotoxin I
Short name:
LeTx I
Leiurotoxin-1
Scyllatoxin
Short name:
ScyTx
OrganismiLeiurus quinquestriatus hebraeus (Yellow scorpion)
Taxonomic identifieri6884 [NCBI]
Taxonomic lineageiEukaryotaMetazoaEcdysozoaArthropodaChelicerataArachnidaScorpionesButhidaButhoideaButhidaeLeiurus

Subcellular locationi

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Secreted

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
PeptideiPRO_00000449241 – 31Potassium channel toxin alpha-KTx 5.1Add BLAST31

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Disulfide bondi3 ↔ 212 Publications
Disulfide bondi8 ↔ 262 Publications
Disulfide bondi12 ↔ 282 Publications
Modified residuei31Histidine amide1 Publication1

Keywords - PTMi

Amidation, Disulfide bond

Expressioni

Tissue specificityi

Expressed by the venom gland.

Structurei

Secondary structure

131
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi5 – 14Combined sources10
Beta strandi18 – 21Combined sources4
Beta strandi23 – 29Combined sources7

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1SCYNMR-A1-31[»]
ProteinModelPortaliP16341.
SMRiP16341.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiP16341.

Family & Domainsi

Domaini

Has the structural arrangement of an alpha-helix connected to a beta-sheet by disulfide bonds (CSalpha/beta).

Sequence similaritiesi

Family and domain databases

InterProiIPR003614. Scorpion_toxin-like.
IPR001947. Scorpion_toxinS_K_inh.
[Graphical view]
PfamiPF00451. Toxin_2. 1 hit.
[Graphical view]
SUPFAMiSSF57095. SSF57095. 1 hit.
PROSITEiPS01138. SCORP_SHORT_TOXIN. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

P16341-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30 
AFCNLRMCQL SCRSLGLLGK CIGDKCECVK H
Length:31
Mass (Da):3,430
Last modified:April 1, 1990 - v1
Checksum:iBB3183DC5CEA53A7
GO

Sequence databases

PIRiA28805.

Cross-referencesi

Sequence databases

PIRiA28805.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1SCYNMR-A1-31[»]
ProteinModelPortaliP16341.
SMRiP16341.
ModBaseiSearch...
MobiDBiSearch...

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Miscellaneous databases

EvolutionaryTraceiP16341.

Family and domain databases

InterProiIPR003614. Scorpion_toxin-like.
IPR001947. Scorpion_toxinS_K_inh.
[Graphical view]
PfamiPF00451. Toxin_2. 1 hit.
[Graphical view]
SUPFAMiSSF57095. SSF57095. 1 hit.
PROSITEiPS01138. SCORP_SHORT_TOXIN. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiKAX51_LEIQH
AccessioniPrimary (citable) accession number: P16341
Entry historyi
Integrated into UniProtKB/Swiss-Prot: April 1, 1990
Last sequence update: April 1, 1990
Last modified: November 2, 2016
This is version 93 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programAnimal Toxin Annotation Program

Miscellaneousi

Keywords - Technical termi

3D-structure, Direct protein sequencing

Documents

  1. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  2. Scorpion potassium channel toxins
    Nomenclature of scorpion potassium channel toxins and list of entries
  3. 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.