3L237_OPHHA
ID 3L237_OPHHA Reviewed; 91 AA.
AC Q53B59;
DT 15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT 24-MAY-2005, sequence version 1.
DT 25-MAY-2022, entry version 54.
DE RecName: Full=Long neurotoxin OH-37;
DE Flags: Precursor;
OS Ophiophagus hannah (King cobra) (Naja hannah).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC Serpentes; Colubroidea; Elapidae; Elapinae; Ophiophagus.
OX NCBI_TaxID=8665;
RN [1]
RP NUCLEOTIDE SEQUENCE [MRNA], PROTEIN SEQUENCE OF 22-38, TOXIC DOSE, AND
RP SUBCELLULAR LOCATION.
RC TISSUE=Venom, and Venom gland;
RX PubMed=15302536; DOI=10.1016/j.toxicon.2004.06.003;
RA He Y.-Y., Lee W.-H., Zhang Y.;
RT "Cloning and purification of alpha-neurotoxins from king cobra (Ophiophagus
RT hannah).";
RL Toxicon 44:295-303(2004).
CC -!- FUNCTION: Binds with high affinity to muscular (alpha-1/CHRNA1) and
CC neuronal (alpha-7/CHRNA7) nicotinic acetylcholine receptor (nAChR) and
CC inhibits acetylcholine from binding to the receptor, thereby impairing
CC neuromuscular and neuronal transmission.
CC {ECO:0000250|UniProtKB:P60615}.
CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000250}.
CC -!- TISSUE SPECIFICITY: Expressed by the venom gland. {ECO:0000305}.
CC -!- TOXIC DOSE: LD(50) is 110 ug/kg by intraperitoneal injection into mice.
CC {ECO:0000269|PubMed:15302536}.
CC -!- SIMILARITY: Belongs to the snake three-finger toxin family. Long-chain
CC subfamily. Type II alpha-neurotoxin sub-subfamily. {ECO:0000305}.
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DR EMBL; AY596927; AAT97249.1; -; mRNA.
DR AlphaFoldDB; Q53B59; -.
DR SMR; Q53B59; -.
DR TopDownProteomics; Q53B59; -.
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; Signal; Toxin.
FT SIGNAL 1..21
FT /evidence="ECO:0000269|PubMed:15302536"
FT CHAIN 22..91
FT /note="Long neurotoxin OH-37"
FT /id="PRO_5000093320"
FT DISULFID 24..41
FT /evidence="ECO:0000250"
FT DISULFID 34..62
FT /evidence="ECO:0000250"
FT DISULFID 47..51
FT /evidence="ECO:0000250"
FT DISULFID 66..77
FT /evidence="ECO:0000250"
FT DISULFID 78..83
FT /evidence="ECO:0000250"
SQ SEQUENCE 91 AA; 9853 MW; 6CBC231DF4E97647 CRC64;
MKTLLLTLVV MTIVCLDLGY SLICFISPHD SVTCAPGENV CFLKSWCDAW CGSRGKKLSF
GCAATCPKVN PGIDIECCST DNCNPHPKLR P