ID   COW1_CONBE              Reviewed;          10 AA.
AC   P0DP19;
DT   10-MAY-2017, integrated into UniProtKB/Swiss-Prot.
DT   10-MAY-2017, sequence version 1.
DT   23-FEB-2022, entry version 10.
DE   RecName: Full=Contryphan-Bt {ECO:0000303|PubMed:17902199};
DE   AltName: Full=B1187 {ECO:0000305|PubMed:17902199};
OS   Conus betulinus (Beech cone).
OC   Eukaryota; Metazoa; Spiralia; Lophotrochozoa; Mollusca; Gastropoda;
OC   Caenogastropoda; Neogastropoda; Conoidea; Conidae; Conus; Dendroconus.
OX   NCBI_TaxID=89764;
RN   [1]
RP   PROTEIN SEQUENCE, IDENTIFICATION BY MASS SPECTROMETRY, MASS SPECTROMETRY,
RP   SUBCELLULAR LOCATION, HYDROXYLATION AT PRO-5, D-AMINO ACID AT TRP-6, AND
RP   AMIDATION AT CYS-10.
RC   TISSUE=Venom;
RX   PubMed=17902199; DOI=10.1002/rcm.3225;
RA   Thakur S.S., Balaram P.;
RT   "Rapid mass spectral identification of contryphans. Detection of
RT   characteristic peptide ions by fragmentation of intact disulfide-bonded
RT   peptides in crude venom.";
RL   Rapid Commun. Mass Spectrom. 21:3420-3426(2007).
CC   -!- FUNCTION: Its target is unknown, but this toxin may modulate voltage-
CC       activated calcium channels (Cav) or calcium-dependent potassium
CC       channels (KCa). {ECO:0000250|UniProtKB:P0C248,
CC       ECO:0000250|UniProtKB:P0C250, ECO:0000250|UniProtKB:P62903,
CC       ECO:0000250|UniProtKB:P83047}.
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:17902199}.
CC   -!- TISSUE SPECIFICITY: Expressed by the venom duct.
CC       {ECO:0000305|PubMed:17902199}.
CC   -!- DOMAIN: The cysteine framework is C-C. {ECO:0000305}.
CC   -!- MASS SPECTROMETRY: Mass=1187; Method=MALDI;
CC       Evidence={ECO:0000269|PubMed:17902199};
CC   -!- MISCELLANEOUS: Exists in two forms, due to cis-trans isomerization at
CC       4-Cys-hydroxyPro-5. {ECO:0000250|UniProtKB:P0C250}.
CC   -!- MISCELLANEOUS: Exists in two forms, due to cis-trans isomerization at
CC       4-Cys-hydroxyPro-5. The cis conformation is the major form.
CC       {ECO:0000250|UniProtKB:P58787}.
CC   -!- SIMILARITY: Belongs to the O2 superfamily. Contryphan family.
CC       {ECO:0000305}.
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DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0099106; F:ion channel regulator activity; IEA:UniProtKB-KW.
DR   GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR   InterPro; IPR011062; Contryphan_CS.
PE   1: Evidence at protein level;
KW   Amidation; D-amino acid; Direct protein sequencing; Disulfide bond;
KW   Hydroxylation; Ion channel impairing toxin; Neurotoxin; Secreted; Toxin.
FT   PEPTIDE         1..10
FT                   /note="Contryphan-Bt"
FT                   /evidence="ECO:0000269|PubMed:17902199"
FT                   /id="PRO_0000439690"
FT   MOD_RES         5
FT                   /note="4-hydroxyproline"
FT                   /evidence="ECO:0000269|PubMed:17902199"
FT   MOD_RES         6
FT                   /note="D-tryptophan"
FT                   /evidence="ECO:0000269|PubMed:17902199"
FT   MOD_RES         10
FT                   /note="Cysteine amide"
FT                   /evidence="ECO:0000269|PubMed:17902199"
FT   DISULFID        4..10
FT                   /evidence="ECO:0000269|PubMed:17902199"
SQ   SEQUENCE   10 AA;  1174 MW;  376FE976C3676EB8 CRC64;
     VVGCPWQPWC