Reviewed, UniProtKB/Swiss-Prot P59886 (KAX38_BUTSI)

Names and origin

Protein names	Recommended name:     Potassium channel toxin alpha-KTx 3.8 Alternative name(s):     Charybdotoxin-like peptide Bs 6       Short name=Bs6
Organism	Buthus sindicus (Scorpion)
Taxonomic identifier	42519 [NCBI]
Taxonomic lineage	Eukaryota › Metazoa › Arthropoda › Chelicerata › Arachnida › Scorpiones › Buthida › Buthoidea › Buthidae › Mesobuthus

Protein attributes

Sequence length	38 AA.
Sequence status	Complete.
Sequence processing	The displayed sequence is not processed.
Protein existence	Evidence at protein level.

General annotation (Comments)

Function	Probable inhibitor of potassium channels By similarity.
Subcellular location	Secreted.
Tissue specificity	Expressed by the venom gland.
Sequence similarities	Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 3 subfamily.
Mass spectrometry	Molecular mass is 4121.4 Da from positions 1 - 38. Determined by MALDI. Ref.1

Ontologies

Keywords
Cellular component	Secreted
Molecular function	Ionic channel inhibitor Neurotoxin Potassium channel inhibitor Toxin
PTM	Disulfide bond
Technical term	Direct protein sequencing
Gene Ontology (GO)
Biological process	pathogenesis Inferred from electronic annotation. Source: UniProtKB-KW
Cellular component	extracellular region Inferred from electronic annotation. Source: UniProtKB-SubCell
Molecular function	potassium channel inhibitor activity Inferred from electronic annotation. Source: UniProtKB-KW
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Peptide	1 – 38	38	Potassium channel toxin alpha-KTx 3.8		PRO_0000044900
Regions
	Region	26 – 33	8	Interaction with Ca(2+)-activated K(+) channels By similarity
Amino acid modifications
	Disulfide bond	8 ↔ 28		By similarity
	Disulfide bond	14 ↔ 33		By similarity
	Disulfide bond	18 ↔ 35		By similarity

Sequences

	Sequence		Length	Mass (Da)
	P59886-1 [UniParc]. Last modified September 26, 2003. Version 1. Checksum: 1F2505014F8D2174	FASTA	38	4,122
	10 20 30 GVPINVKCRG SPQCIQPCRD AGMRFGKCMN GKCHCTPQ

References

[1]

"Purification and primary structure of low molecular mass peptides from scorpion (Buthus sindicus) venom." Ali S.A., Stoeva S., Schuetz J., Kayed R., Abbasi A., Zaidi Z.H., Voelter W. Comp. Biochem. Physiol. 121A:323-332(1998) [PubMed: 10048185] [Abstract] Cited for: PROTEIN SEQUENCE, MASS SPECTROMETRY. Tissue: Venom.

Cross-references

3D structure databases
ModBase	Search...
Family and domain databases
InterPro	IPR001947. Scorpion_toxinS. [Graphical view]
Pfam	PF00451. Toxin_2. 1 hit. [Graphical view]
PRINTS	PR00286. CHARYBDTOXIN.
ProDom	PD003586. Scorpion_toxinS. 1 hit. [Graphical view] [Entries sharing at least one domain]
PROSITE	PS01138. SCORP_SHORT_TOXIN. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

KAX38_BUTSI

Accession

Primary (citable) accession number: P59886

Entry history

Integrated into UniProtKB/Swiss-Prot:	September 26, 2003
Last sequence update:	September 26, 2003
Last modified:	June 16, 2009
This is version 31 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation project

Tox-Prot (Toxin Annotation Project)