ID   3S1A_HYDPL              Reviewed;          60 AA.
AC   P62388; P01436; P25493;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   05-JUL-2004, sequence version 1.
DT   25-MAY-2022, entry version 62.
DE   RecName: Full=Pelamitoxin a;
OS   Hydrophis platurus (Yellow-bellied sea snake) (Pelamis platura).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC   Serpentes; Colubroidea; Hydrophiidae; Hydrophis.
OX   NCBI_TaxID=8688;
RN   [1]
RP   PROTEIN SEQUENCE, TOXIC DOSE, AND SUBCELLULAR LOCATION.
RC   TISSUE=Venom;
RX   PubMed=1014035; DOI=10.1016/0041-0101(76)90063-5;
RA   Wang C.L., Liu C.-S., Hung Y.O., Blackwell R.Q.;
RT   "Amino acid sequence of pelamitoxin a, the main neurotoxin of the sea
RT   snake, Pelamis platurus.";
RL   Toxicon 14:459-466(1976).
CC   -!- FUNCTION: Binds to muscle nicotinic acetylcholine receptor (nAChR) and
CC       inhibit acetylcholine from binding to the receptor, thereby impairing
CC       neuromuscular transmission. {ECO:0000250|UniProtKB:P60775}.
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:1014035}.
CC   -!- TISSUE SPECIFICITY: Expressed by the venom gland. {ECO:0000305}.
CC   -!- TOXIC DOSE: LD(50) is 0.07 mg/kg by intraperitoneal injection for
CC       pelamitoxin A. {ECO:0000269|PubMed:1014035}.
CC   -!- SIMILARITY: Belongs to the snake three-finger toxin family. Short-chain
CC       subfamily. Type I alpha-neurotoxin sub-subfamily. {ECO:0000305}.
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DR   PIR; A94310; N1EY1P.
DR   AlphaFoldDB; P62388; -.
DR   SMR; P62388; -.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0030550; F:acetylcholine receptor inhibitor activity; IEA:UniProtKB-KW.
DR   GO; GO:0099106; F:ion channel regulator activity; IEA:UniProtKB-KW.
DR   GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR   CDD; cd00206; snake_toxin; 1.
DR   Gene3D; 2.10.60.10; -; 1.
DR   InterPro; IPR003571; Snake_3FTx.
DR   InterPro; IPR045860; Snake_toxin-like_sf.
DR   InterPro; IPR018354; Snake_toxin_con_site.
DR   SUPFAM; SSF57302; SSF57302; 1.
DR   PROSITE; PS00272; SNAKE_TOXIN; 1.
PE   1: Evidence at protein level;
KW   Acetylcholine receptor inhibiting toxin; Direct protein sequencing;
KW   Disulfide bond; Ion channel impairing toxin; Neurotoxin;
KW   Postsynaptic neurotoxin; Secreted; Toxin.
FT   CHAIN           1..60
FT                   /note="Pelamitoxin a"
FT                   /evidence="ECO:0000269|PubMed:1014035"
FT                   /id="PRO_0000093581"
FT   DISULFID        3..22
FT                   /evidence="ECO:0000250|UniProtKB:P0C1Z0"
FT   DISULFID        17..39
FT                   /evidence="ECO:0000250|UniProtKB:P0C1Z0"
FT   DISULFID        41..52
FT                   /evidence="ECO:0000250|UniProtKB:P0C1Z0"
FT   DISULFID        53..58
FT                   /evidence="ECO:0000250|UniProtKB:P0C1Z0"
SQ   SEQUENCE   60 AA;  6687 MW;  C5C9081D1156E59A CRC64;
     MTCCNQQSSQ PKTTTNCAES SCYKKTWSDH RGTRIERGCG CPQVKSGIKL ECCHTNECNN