ID   O261_CONTE              Reviewed;          79 AA.
AC   Q9BHB7;
DT   08-FEB-2011, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-2001, sequence version 1.
DT   25-MAY-2022, entry version 50.
DE   RecName: Full=Conotoxin TxMEKL-021;
DE   AltName: Full=Conotoxin TxMEKL-022;
DE   Flags: Precursor;
OS   Conus textile (Cloth-of-gold cone).
OC   Eukaryota; Metazoa; Spiralia; Lophotrochozoa; Mollusca; Gastropoda;
OC   Caenogastropoda; Neogastropoda; Conoidea; Conidae; Conus; Cylinder.
OX   NCBI_TaxID=6494;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   TISSUE=Venom duct;
RX   PubMed=11158371; DOI=10.1093/oxfordjournals.molbev.a003786;
RA   Conticello S.G., Gilad Y., Avidan N., Ben-Asher E., Levy Z., Fainzilber M.;
RT   "Mechanisms for evolving hypervariability: the case of conopeptides.";
RL   Mol. Biol. Evol. 18:120-131(2001).
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000250}.
CC   -!- TISSUE SPECIFICITY: Expressed by the venom duct.
CC   -!- DOMAIN: The presence of a 'disulfide through disulfide knot'
CC       structurally defines this protein as a knottin. {ECO:0000250}.
CC   -!- DOMAIN: The cysteine framework is VI/VII (C-C-CC-C-C).
CC   -!- SIMILARITY: Belongs to the conotoxin O2 superfamily. {ECO:0000305}.
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DR   EMBL; AF215018; AAG60446.1; -; mRNA.
DR   EMBL; AF215027; AAG60455.1; -; mRNA.
DR   AlphaFoldDB; Q9BHB7; -.
DR   ConoServer; 705; TxMEKL-022/TxMEKL-021 precursor.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0008200; F:ion channel inhibitor activity; IEA:InterPro.
DR   GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR   InterPro; IPR004214; Conotoxin.
DR   Pfam; PF02950; Conotoxin; 1.
PE   2: Evidence at transcript level;
KW   Disulfide bond; Knottin; Neurotoxin; Secreted; Signal; Toxin.
FT   SIGNAL          1..19
FT                   /evidence="ECO:0000255"
FT   PROPEP          20..47
FT                   /evidence="ECO:0000255"
FT                   /id="PRO_0000404786"
FT   PEPTIDE         48..79
FT                   /note="Conotoxin TxMEKL-021"
FT                   /evidence="ECO:0000255"
FT                   /id="PRO_0000404787"
FT   DISULFID        51..65
FT                   /evidence="ECO:0000250"
FT   DISULFID        58..69
FT                   /evidence="ECO:0000250"
FT   DISULFID        64..75
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   79 AA;  8915 MW;  1A281EA818DE1A8C CRC64;
     MEKLTILLLV AVVLMSTQAL PQGGGEKRPR ENIRFLSKRK SNAERWREGS CTSWLATCTD
     ASQCCTGVCY KRAYCALWE