ID   3S11_NAJPH              Reviewed;          61 AA.
AC   P60773; P01428;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   21-JUL-1986, sequence version 1.
DT   25-MAY-2022, entry version 65.
DE   RecName: Full=Short neurotoxin 1;
DE            Short=NTX I;
OS   Naja philippinensis (Philippine cobra).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC   Serpentes; Colubroidea; Elapidae; Elapinae; Naja.
OX   NCBI_TaxID=8659;
RN   [1]
RP   PROTEIN SEQUENCE (MAJOR COMPONENT), AND SUBCELLULAR LOCATION.
RC   TISSUE=Venom;
RX   PubMed=4426734;
RA   Hauert J., Maire M., Sussmann A., Bargetzi J.-P.;
RT   "The major lethal neurotoxin of the venom of Naja naja philippinensis.
RT   Purification, physical and chemical properties, partial amino acid
RT   sequence.";
RL   Int. J. Pept. Protein Res. 6:201-222(1974).
RN   [2]
RP   PROTEIN SEQUENCE (MINOR COMPONENT).
RC   TISSUE=Venom;
RA   Hauert J.;
RL   Thesis (1977), University of Geneva, Switzerland.
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:4426734}.
CC   -!- TISSUE SPECIFICITY: Expressed by the venom gland. {ECO:0000305}.
CC   -!- TOXIC DOSE: LD(50) is 0.05 mg/kg by intravenous injection.
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; A91768; N1NJ1P.
DR   PIR; B94448; N1NJ2P.
DR   AlphaFoldDB; P60773; -.
DR   SMR; P60773; -.
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..61
FT                   /note="Short neurotoxin 1"
FT                   /evidence="ECO:0000269|PubMed:4426734"
FT                   /id="PRO_0000093609"
FT   DISULFID        3..23
FT                   /evidence="ECO:0000250|UniProtKB:P0C1Z0"
FT   DISULFID        17..40
FT                   /evidence="ECO:0000250|UniProtKB:P0C1Z0"
FT   DISULFID        42..53
FT                   /evidence="ECO:0000250|UniProtKB:P0C1Z0"
FT   DISULFID        54..59
FT                   /evidence="ECO:0000250|UniProtKB:P0C1Z0"
FT   VARIANT         55
FT                   /note="R -> T (in minor component)"
SQ   SEQUENCE   61 AA;  6873 MW;  74A0EA75BE568961 CRC64;
     LECHNQQSSQ APTTKTCSGE TNCYKKWWSD HRGTIIERGC GCPKVKPGVK LNCCRTDRCN
     N