KAX26_CENLM
ID KAX26_CENLM Reviewed; 34 AA.
AC P59849;
DT 19-SEP-2003, integrated into UniProtKB/Swiss-Prot.
DT 19-SEP-2003, sequence version 1.
DT 23-FEB-2022, entry version 52.
DE RecName: Full=Potassium channel toxin alpha-KTx 2.6;
DE AltName: Full=Hongotoxin-3 {ECO:0000303|PubMed:9446567};
DE Short=HgTX3 {ECO:0000303|PubMed:9446567};
DE Flags: Fragment;
OS Centruroides limbatus (Bark scorpion).
OC Eukaryota; Metazoa; Ecdysozoa; Arthropoda; Chelicerata; Arachnida;
OC Scorpiones; Buthida; Buthoidea; Buthidae; Centruroides.
OX NCBI_TaxID=244936;
RN [1]
RP PROTEIN SEQUENCE, AND SUBCELLULAR LOCATION.
RC TISSUE=Venom;
RX PubMed=9446567; DOI=10.1074/jbc.273.5.2639;
RA Koschak A., Bugianesi R.M., Mitterdorfer J., Kaczorowski G.J., Garcia M.L.,
RA Knaus H.-G.;
RT "Subunit composition of brain voltage-gated potassium channels determined
RT by hongotoxin-1, a novel peptide derived from Centruroides limbatus
RT venom.";
RL J. Biol. Chem. 273:2639-2644(1998).
CC -!- FUNCTION: Potent inhibitor of Kv1/KCNA voltage-gated potassium
CC channels. {ECO:0000250|UniProtKB:P59847}.
CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:9446567}.
CC -!- TISSUE SPECIFICITY: Expressed by the venom gland.
CC {ECO:0000305|PubMed:9446567}.
CC -!- DOMAIN: Has the structural arrangement of an alpha-helix connected to a
CC beta-sheet by disulfide bonds (CSalpha/beta).
CC {ECO:0000250|UniProtKB:P40755}.
CC -!- SIMILARITY: Belongs to the short scorpion toxin superfamily. Potassium
CC channel inhibitor family. Alpha-KTx 02 subfamily. {ECO:0000305}.
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DR GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR GO; GO:0008200; F:ion channel inhibitor activity; IEA:InterPro.
DR GO; GO:0015459; F:potassium channel regulator activity; IEA:UniProtKB-KW.
DR GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR Gene3D; 3.30.30.10; -; 1.
DR InterPro; IPR036574; Scorpion_toxin-like_sf.
DR InterPro; IPR001947; Scorpion_toxinS_K_inh.
DR Pfam; PF00451; Toxin_2; 1.
DR PRINTS; PR00286; CHARYBDTOXIN.
DR SUPFAM; SSF57095; SSF57095; 1.
PE 1: Evidence at protein level;
KW Direct protein sequencing; Ion channel impairing toxin; Neurotoxin;
KW Potassium channel impairing toxin; Secreted; Toxin;
KW Voltage-gated potassium channel impairing toxin.
FT CHAIN 1..>34
FT /note="Potassium channel toxin alpha-KTx 2.6"
FT /id="PRO_0000066834"
FT SITE 27
FT /note="Basic residue of the functional dyad"
FT /evidence="ECO:0000250"
FT NON_TER 34
SQ SEQUENCE 34 AA; 3647 MW; 2FFA1C22D0015784 CRC64;
TFINVKCTSP KQCLPACKEK FGXAAGKCMN GKCK