3SA3_NAJHA
ID 3SA3_NAJHA Reviewed; 60 AA.
AC P01459;
DT 21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT 21-JUL-1986, sequence version 1.
DT 03-AUG-2022, entry version 94.
DE RecName: Full=Cytotoxin 3;
DE AltName: Full=Toxin CM-8/CM-8A;
OS Naja annulifera (Banded Egyptian cobra) (Naja haje annulifera).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC Serpentes; Colubroidea; Elapidae; Elapinae; Naja.
OX NCBI_TaxID=96794;
RN [1]
RP PROTEIN SEQUENCE, SUBCELLULAR LOCATION, AND TOXIC DOSE.
RC TISSUE=Venom;
RX PubMed=1278155; DOI=10.1111/j.1432-1033.1976.tb10291.x;
RA Joubert F.J.;
RT "Snake venom toxins. The amino-acid sequences of three toxins (CM-8, CM-11
RT and CM-13a) from Naja haje annulifera (Egyptian cobra) venom.";
RL Eur. J. Biochem. 64:219-232(1976).
CC -!- FUNCTION: Shows cytolytic activity on many different cells by forming
CC pore in lipid membranes. In vivo, increases heart rate or kills the
CC animal by cardiac arrest. In addition, it binds to heparin with high
CC affinity, interacts with Kv channel-interacting protein 1 (KCNIP1) in a
CC calcium-independent manner, and binds to integrin alpha-V/beta-3
CC (ITGAV/ITGB3) with moderate affinity. {ECO:0000250|UniProtKB:P60301,
CC ECO:0000250|UniProtKB:P60304}.
CC -!- SUBUNIT: Monomer in solution; Homodimer and oligomer in the presence of
CC negatively charged lipids forming a pore with a size ranging between 20
CC and 30 Angstroms. {ECO:0000250|UniProtKB:P60301}.
CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:1278155}. Target
CC cell membrane {ECO:0000250|UniProtKB:P60301}.
CC -!- TISSUE SPECIFICITY: Expressed by the venom gland. {ECO:0000305}.
CC -!- TOXIC DOSE: LD(50) is 2.98 mg/kg by intravenous injection.
CC {ECO:0000269|PubMed:1278155}.
CC -!- MISCELLANEOUS: The sequence of the major component is shown, it is
CC called toxin CM-8 and the minor component is called toxin CM-8A.
CC -!- MISCELLANEOUS: Is classified as a S-type cytotoxin, since a serine
CC residue stands at position 28 (Ser-29 in standard classification).
CC {ECO:0000305}.
CC -!- SIMILARITY: Belongs to the snake three-finger toxin family. Short-chain
CC subfamily. Type IA cytotoxin sub-subfamily. {ECO:0000305}.
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DR PIR; A01723; H3NJ3E.
DR PIR; B01723; H3NJME.
DR AlphaFoldDB; P01459; -.
DR SMR; P01459; -.
DR PRIDE; P01459; -.
DR GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR GO; GO:0016020; C:membrane; IEA:UniProtKB-KW.
DR GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR GO; GO:0019835; P:cytolysis; IEA:UniProtKB-KW.
DR CDD; cd00206; snake_toxin; 1.
DR Gene3D; 2.10.60.10; -; 1.
DR InterPro; IPR003572; Cytotoxin_Cobra.
DR InterPro; IPR003571; Snake_3FTx.
DR InterPro; IPR045860; Snake_toxin-like_sf.
DR InterPro; IPR018354; Snake_toxin_con_site.
DR PRINTS; PR00282; CYTOTOXIN.
DR SUPFAM; SSF57302; SSF57302; 1.
DR PROSITE; PS00272; SNAKE_TOXIN; 1.
PE 1: Evidence at protein level;
KW Cardiotoxin; Cytolysis; Direct protein sequencing; Disulfide bond;
KW Membrane; Secreted; Target cell membrane; Target membrane; Toxin.
FT CHAIN 1..60
FT /note="Cytotoxin 3"
FT /evidence="ECO:0000269|PubMed:1278155"
FT /id="PRO_0000093487"
FT DISULFID 3..21
FT /evidence="ECO:0000250|UniProtKB:P60301"
FT DISULFID 14..38
FT /evidence="ECO:0000250|UniProtKB:P60301"
FT DISULFID 42..53
FT /evidence="ECO:0000250|UniProtKB:P60301"
FT DISULFID 54..59
FT /evidence="ECO:0000250|UniProtKB:P60301"
FT VARIANT 4
FT /note="Y -> H (in toxin CM-8A)"
SQ SEQUENCE 60 AA; 6839 MW; D64B08ACB07FF1F0 CRC64;
LKCYKLVPPF WKTCPEGKNL CYKMYMVSTL TVPVKRGCID VCPKNSALVK YVCCNTDKCN
