TX1_LOXIN
ID TX1_LOXIN Reviewed; 101 AA.
AC Q6B4T5;
DT 28-NOV-2006, integrated into UniProtKB/Swiss-Prot.
DT 13-SEP-2004, sequence version 1.
DT 25-MAY-2022, entry version 41.
DE RecName: Full=U1-sicaritoxin-Li1a;
DE Short=U1-SCRTX-Li1a;
DE AltName: Full=LiTx1 {ECO:0000303|PubMed:15302533};
DE Flags: Precursor;
OS Loxosceles intermedia (Brown spider).
OC Eukaryota; Metazoa; Ecdysozoa; Arthropoda; Chelicerata; Arachnida; Araneae;
OC Araneomorphae; Haplogynae; Scytodoidea; Sicariidae; Loxosceles.
OX NCBI_TaxID=58218;
RN [1]
RP NUCLEOTIDE SEQUENCE [MRNA], PROTEIN SEQUENCE OF 36-51, AND SUBCELLULAR
RP LOCATION.
RC TISSUE=Venom, and Venom gland;
RX PubMed=15302533; DOI=10.1016/j.toxicon.2004.05.028;
RA de Castro C.S., Silvestre F.G., Araujo S.C., Yazbeck G.M., Mangili O.C.,
RA Cruz I., Chavez-Olortegui C., Kalapothakis E.;
RT "Identification and molecular cloning of insecticidal toxins from the venom
RT of the brown spider Loxosceles intermedia.";
RL Toxicon 44:273-280(2004).
CC -!- FUNCTION: Toxin active against insects (S.frugiperda larvae). May act
CC on sodium (Nav) or calcium channels (Cav).
CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:15302533}.
CC -!- TISSUE SPECIFICITY: Expressed by the venom gland.
CC {ECO:0000305|PubMed:15302533}.
CC -!- DOMAIN: The presence of a 'disulfide through disulfide knot'
CC structurally defines this protein as a knottin. {ECO:0000250}.
CC -!- SIMILARITY: Belongs to the neurotoxin 28 (Litx) family. {ECO:0000305}.
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DR EMBL; AY681975; AAT85610.1; -; mRNA.
DR AlphaFoldDB; Q6B4T5; -.
DR SMR; Q6B4T5; -.
DR ArachnoServer; AS000225; U1-sicaritoxin-Li1a.
DR GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR GO; GO:0099106; F:ion channel regulator activity; IEA:UniProtKB-KW.
DR GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
PE 1: Evidence at protein level;
KW Amidation; Cleavage on pair of basic residues; Direct protein sequencing;
KW Disulfide bond; Ion channel impairing toxin; Knottin; Neurotoxin; Secreted;
KW Signal; Toxin.
FT SIGNAL 1..19
FT /evidence="ECO:0000255"
FT PROPEP 20..35
FT /evidence="ECO:0000269|PubMed:15302533"
FT /id="PRO_0000262655"
FT CHAIN 36..81
FT /note="U1-sicaritoxin-Li1a"
FT /id="PRO_0000262656"
FT PROPEP 85..101
FT /id="PRO_0000262657"
FT MOD_RES 81
FT /note="Lysine amide"
FT /evidence="ECO:0000255"
FT DISULFID 37..54
FT /evidence="ECO:0000250"
FT DISULFID 45..59
FT /evidence="ECO:0000250"
FT DISULFID 53..72
FT /evidence="ECO:0000250"
FT DISULFID 61..70
FT /evidence="ECO:0000250"
FT CONFLICT 45
FT /note="C -> G (in Ref. 1; AA sequence)"
FT /evidence="ECO:0000305"
SQ SEQUENCE 101 AA; 11214 MW; EC2CF9757225B274 CRC64;
MRFLVGAVLV VVLVACATAF ESDAETFKSL VVEERKCHGD GSKGCATKPD DWCCKNTPCK
CPAWSSTSEC RCAMDCSRRC KGKRALLLPV ETHRLLFPEQ W