SCX2_TITZU
ID SCX2_TITZU Reviewed; 69 AA.
AC Q1I165;
DT 17-OCT-2006, integrated into UniProtKB/Swiss-Prot.
DT 13-JUN-2006, sequence version 1.
DT 03-AUG-2022, entry version 41.
DE RecName: Full=Toxin Tz2;
DE AltName: Full=P*T-beta* NaTx1.1;
DE Flags: Precursor; Fragment;
OS Tityus zulianus (Venezuelan scorpion).
OC Eukaryota; Metazoa; Ecdysozoa; Arthropoda; Chelicerata; Arachnida;
OC Scorpiones; Buthida; Buthoidea; Buthidae; Tityus.
OX NCBI_TaxID=288787;
RN [1]
RP NUCLEOTIDE SEQUENCE [MRNA], AND MASS SPECTROMETRY.
RC TISSUE=Venom, and Venom gland;
RX PubMed=16356783; DOI=10.1016/j.cbpc.2005.10.011;
RA Borges A., Garcia C.C., Lugo E., Alfonzo M.J., Jowers M.J.,
RA Op den Camp H.J.M.;
RT "Diversity of long-chain toxins in Tityus zulianus and Tityus discrepans
RT venoms (Scorpiones, Buthidae): molecular, immunological, and mass spectral
RT analyses.";
RL Comp. Biochem. Physiol. 142C:240-252(2006).
RN [2]
RP NOMENCLATURE.
RX PubMed=22355312; DOI=10.1371/journal.pone.0030478;
RA Guerrero-Vargas J.A., Mourao C.B., Quintero-Hernandez V., Possani L.D.,
RA Schwartz E.F.;
RT "Identification and phylogenetic analysis of Tityus pachyurus and Tityus
RT obscurus novel putative Na+-channel scorpion toxins.";
RL PLoS ONE 7:E30478-E30478(2012).
CC -!- FUNCTION: Beta toxins bind voltage-independently at site-4 of sodium
CC channels (Nav) and shift the voltage of activation toward more negative
CC potentials thereby affecting sodium channel activation and promoting
CC spontaneous and repetitive firing. {ECO:0000250}.
CC -!- SUBCELLULAR LOCATION: Secreted.
CC -!- TISSUE SPECIFICITY: Expressed by the venom gland.
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 -!- MASS SPECTROMETRY: Mass=7127.10; Method=MALDI;
CC Evidence={ECO:0000269|PubMed:16356783};
CC -!- MISCELLANEOUS: Does not affect the cardiac Nav1.5/SCN5A, the peripheral
CC nerve channel Nav1.7/SCN9A, and the voltage-dependent potassium channel
CC Kv1.5/KCNA5. {ECO:0000250}.
CC -!- SIMILARITY: Belongs to the long (4 C-C) scorpion toxin superfamily.
CC Sodium channel inhibitor family. Beta subfamily. {ECO:0000305}.
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DR EMBL; DQ075241; AAZ29720.1; -; mRNA.
DR AlphaFoldDB; Q1I165; -.
DR SMR; Q1I165; -.
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 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 1: Evidence at protein level;
KW Disulfide bond; Ion channel impairing toxin; Neurotoxin; Secreted; Signal;
KW Toxin; Voltage-gated sodium channel impairing toxin.
FT SIGNAL <1..7
FT /evidence="ECO:0000250"
FT CHAIN 8..69
FT /note="Toxin Tz2"
FT /id="PRO_0000253777"
FT DOMAIN 8..69
FT /note="LCN-type CS-alpha/beta"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01210"
FT DISULFID 19..69
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01210"
FT DISULFID 23..45
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01210"
FT DISULFID 31..50
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01210"
FT DISULFID 35..52
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01210"
FT NON_TER 1
SQ SEQUENCE 69 AA; 7764 MW; EAC652CA2BA2E583 CRC64;
IEVVMGGKEG YLLDKSNGCK RSCFFGSTSW CNTECKSKSA EKGYCAWPSC YCYGFSDDSK
MWDLKTNKC