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UniProtKB - P01485 (SCX3_BUTOC)
Protein
Alpha-mammal toxin Bot3
Gene
N/A
Organism
Buthus occitanus tunetanus (Common European scorpion) (Buthus tunetanus)
Status
Functioni
Alpha toxins bind voltage-independently at site-3 of sodium channels (Nav) and inhibit the inactivation of the activated channels, thereby blocking neuronal transmission. Is active against mammals and binds with high affinity to rat brain synaptosomes.
1 PublicationGO - Molecular functioni
- sodium channel inhibitor activity Source: InterPro
- toxin activity Source: UniProtKB-KW
GO - Biological processi
- defense response Source: InterPro
- modulation by symbiont of host nervous system process Source: InterPro
Keywordsi
Molecular function | Ion channel impairing toxin, Neurotoxin, Toxin, Voltage-gated sodium channel impairing toxin |
Names & Taxonomyi
Protein namesi | Recommended name: Alpha-mammal toxin Bot3Alternative name(s): Bot III Short name: BotIII Neurotoxin III |
Organismi | Buthus occitanus tunetanus (Common European scorpion) (Buthus tunetanus) |
Taxonomic identifieri | 6871 [NCBI] |
Taxonomic lineagei | Eukaryota › Metazoa › Ecdysozoa › Arthropoda › Chelicerata › Arachnida › Scorpiones › Buthida › Buthoidea › Buthidae › Buthus › |
Subcellular locationi
Extracellular region or secreted
- Secreted 1 Publication
Extracellular region or secreted
- extracellular region Source: UniProtKB-SubCell
Keywords - Cellular componenti
SecretedPathology & Biotechi
Toxic dosei
LD50 is 1.25 µg/kg (25 ng/mouse) by intracerebroventricular injection into mice.
Mutagenesis
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Mutagenesisi | 72 | N → H: No change in lethal activity to mice; when N-72 is not amidated. 1 Publication | 1 | |
Mutagenesisi | 72 | N → NGR: Total loss of lethal activity, and incapacity to bind rat brain synaptosomes. 1 Publication | 1 |
PTM / Processingi
Molecule processing
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Signal peptidei | ‹1 – 8 | 1 Publication | ›8 | |
ChainiPRO_0000066734 | 9 – 72 | Alpha-mammal toxin Bot31 PublicationAdd BLAST | 64 |
Amino acid modifications
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Disulfide bondi | 20 ↔ 71 | PROSITE-ProRule annotation | ||
Disulfide bondi | 24 ↔ 44 | PROSITE-ProRule annotation | ||
Disulfide bondi | 30 ↔ 54 | PROSITE-ProRule annotation | ||
Disulfide bondi | 34 ↔ 56 | PROSITE-ProRule annotation | ||
Modified residuei | 72 | Asparagine amide1 Publication | 1 |
Post-translational modificationi
When the toxin is not amidated, there are 75% loss of toxicity to mice, and total incapacity to bind rat brain synaptosomes.1 Publication
Keywords - PTMi
Amidation, Disulfide bondExpressioni
Tissue specificityi
Expressed by the venom gland.1 Publication
Family & Domainsi
Domains and Repeats
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Domaini | 10 – 72 | LCN-type CS-alpha/betaPROSITE-ProRule annotationAdd BLAST | 63 |
Domaini
Has the structural arrangement of an alpha-helix connected to antiparallel beta-sheets by disulfide bonds (CS-alpha/beta).Curated
Sequence similaritiesi
Belongs to the long (4 C-C) scorpion toxin superfamily. Sodium channel inhibitor family. Alpha subfamily.Curated
Keywords - Domaini
SignalFamily and domain databases
CDDi | cd00107, Knot1, 1 hit |
Gene3Di | 3.30.30.10, 1 hit |
InterProi | View protein in InterPro IPR044062, LCN-type_CS_alpha_beta_dom IPR003614, Scorpion_toxin-like IPR036574, Scorpion_toxin-like_sf IPR018218, Scorpion_toxinL IPR002061, Scorpion_toxinL/defensin |
Pfami | View protein in Pfam PF00537, Toxin_3, 1 hit |
PRINTSi | PR00285, SCORPNTOXIN |
SMARTi | View protein in SMART SM00505, Knot1, 1 hit |
SUPFAMi | SSF57095, SSF57095, 1 hit |
PROSITEi | View protein in PROSITE PS51863, LCN_CSAB, 1 hit |
i Sequence
Sequence statusi: Fragment.
: The displayed sequence is further processed into a mature form. Sequence processingi
P01485-1 [UniParc]FASTAAdd to basket
10 20 30 40 50
LVMAGVESVK DGYIVDDRNC TYFCGRNAYC NEECTKLKGE SGYCQWASPY
60 70
GNACYCYKVP DHVRTKGPGR CN
Experimental Info
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Non-terminal residuei | 1 | 1 |
Sequence databases
PIRi | A01745, NTSR3B |
Similar proteinsi
Cross-referencesi
Sequence databases
PIRi | A01745, NTSR3B |
3D structure databases
AlphaFoldDBi | P01485 |
SMRi | P01485 |
ModBasei | Search... |
Family and domain databases
CDDi | cd00107, Knot1, 1 hit |
Gene3Di | 3.30.30.10, 1 hit |
InterProi | View protein in InterPro IPR044062, LCN-type_CS_alpha_beta_dom IPR003614, Scorpion_toxin-like IPR036574, Scorpion_toxin-like_sf IPR018218, Scorpion_toxinL IPR002061, Scorpion_toxinL/defensin |
Pfami | View protein in Pfam PF00537, Toxin_3, 1 hit |
PRINTSi | PR00285, SCORPNTOXIN |
SMARTi | View protein in SMART SM00505, Knot1, 1 hit |
SUPFAMi | SSF57095, SSF57095, 1 hit |
PROSITEi | View protein in PROSITE PS51863, LCN_CSAB, 1 hit |
MobiDBi | Search... |
Entry informationi
Entry namei | SCX3_BUTOC | |
Accessioni | P01485Primary (citable) accession number: P01485 | |
Entry historyi | Integrated into UniProtKB/Swiss-Prot: | July 21, 1986 |
Last sequence update: | November 13, 2007 | |
Last modified: | May 25, 2022 | |
This is version 98 of the entry and version 2 of the sequence. See complete history. | ||
Entry statusi | Reviewed (UniProtKB/Swiss-Prot) | |
Annotation program | Animal Toxin Annotation Program |
Miscellaneousi
Keywords - Technical termi
Direct protein sequencingDocuments
- SIMILARITY comments
Index of protein domains and families