SCX3A_ANDCR
ID SCX3A_ANDCR Reviewed; 69 AA.
AC D5HR52;
DT 01-APR-2015, integrated into UniProtKB/Swiss-Prot.
DT 15-JUN-2010, sequence version 1.
DT 03-AUG-2022, entry version 34.
DE RecName: Full=Alpha-toxin Ac3;
DE AltName: Full=Neurotoxin 3;
DE Flags: Precursor; Fragment;
OS Androctonus crassicauda (Arabian fat-tailed scorpion).
OC Eukaryota; Metazoa; Ecdysozoa; Arthropoda; Chelicerata; Arachnida;
OC Scorpiones; Buthida; Buthoidea; Buthidae; Androctonus.
OX NCBI_TaxID=122909;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=20018978; DOI=10.1093/molbev/msp310;
RA Weinberger H., Moran Y., Gordon D., Turkov M., Kahn R., Gurevitz M.;
RT "Positions under positive selection--key for selectivity and potency of
RT scorpion alpha-toxins.";
RL Mol. Biol. Evol. 27:1025-1034(2010).
CC -!- FUNCTION: Alpha toxins bind voltage-independently at site-3 of sodium
CC channels (Nav) and inhibit the inactivation of the activated channels,
CC thereby blocking neuronal transmission. {ECO:0000250|UniProtKB:P01485}.
CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000250|UniProtKB:P01485}.
CC -!- TISSUE SPECIFICITY: Expressed by the venom gland. {ECO:0000305}.
CC -!- DOMAIN: Has the structural arrangement of an alpha-helix connected to
CC antiparallel beta-sheets by disulfide bonds (CS-alpha/beta).
CC {ECO:0000305}.
CC -!- SIMILARITY: Belongs to the long (4 C-C) scorpion toxin superfamily.
CC Sodium channel inhibitor family. Alpha subfamily. {ECO:0000305}.
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DR EMBL; GQ335452; ADE42761.1; -; Genomic_DNA.
DR AlphaFoldDB; D5HR52; -.
DR SMR; D5HR52; -.
DR GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR GO; GO:0019871; F:sodium channel inhibitor activity; IEA:InterPro.
DR GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR GO; GO:0006952; P:defense response; IEA:InterPro.
DR CDD; cd00107; Knot1; 1.
DR Gene3D; 3.30.30.10; -; 1.
DR InterPro; IPR044062; LCN-type_CS_alpha_beta_dom.
DR InterPro; IPR003614; Scorpion_toxin-like.
DR InterPro; IPR036574; Scorpion_toxin-like_sf.
DR InterPro; IPR018218; Scorpion_toxinL.
DR InterPro; IPR002061; Scorpion_toxinL/defensin.
DR Pfam; PF00537; Toxin_3; 1.
DR PRINTS; PR00285; SCORPNTOXIN.
DR SMART; SM00505; Knot1; 1.
DR SUPFAM; SSF57095; SSF57095; 1.
DR PROSITE; PS51863; LCN_CSAB; 1.
PE 3: Inferred from homology;
KW Amidation; Disulfide bond; Ion channel impairing toxin; Neurotoxin;
KW Secreted; Signal; Toxin; Voltage-gated sodium channel impairing toxin.
FT SIGNAL <1..3
FT /evidence="ECO:0000250|UniProtKB:P01485"
FT CHAIN 4..67
FT /note="Alpha-toxin Ac3"
FT /id="PRO_5000585059"
FT DOMAIN 5..67
FT /note="LCN-type CS-alpha/beta"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01210"
FT MOD_RES 67
FT /note="Asparagine amide"
FT /evidence="ECO:0000250|UniProtKB:P01485"
FT DISULFID 15..66
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01210"
FT DISULFID 19..39
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01210"
FT DISULFID 25..49
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01210"
FT DISULFID 29..51
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01210"
FT NON_TER 1
FT /evidence="ECO:0000305|PubMed:20018978"
SQ SEQUENCE 69 AA; 7815 MW; DDF835AA62BD470B CRC64;
VESIKDGYIV DDRNCTYFCG RNAYCNEECT KLKGESGYCQ WASPYGNACY CYKLPDHVRT
KAPGKCNGR