O165_CONAH
ID O165_CONAH Reviewed; 78 AA.
AC P0C8V9;
DT 03-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT 03-MAR-2009, sequence version 1.
DT 25-MAY-2022, entry version 33.
DE RecName: Full=Omega-conotoxin-like Ac6.5;
DE Flags: Precursor;
OS Conus achatinus (Little frog cone).
OC Eukaryota; Metazoa; Spiralia; Lophotrochozoa; Mollusca; Gastropoda;
OC Caenogastropoda; Neogastropoda; Conoidea; Conidae; Conus; Pionoconus.
OX NCBI_TaxID=369967;
RN [1]
RP NUCLEOTIDE SEQUENCE [MRNA], PROTEIN SEQUENCE OF 43-78, HYDROXYLATION AT
RP PRO-55 AND PRO-67, AND IDENTIFICATION BY MASS SPECTROMETRY.
RC TISSUE=Venom, and Venom duct;
RX PubMed=18286662; DOI=10.1002/jms.1377;
RA Gowd K.H., Dewan K.K., Iengar P., Krishnan K.S., Balaram P.;
RT "Probing peptide libraries from Conus achatinus using mass spectrometry and
RT cDNA sequencing: identification of delta and omega-conotoxins.";
RL J. Mass Spectrom. 43:791-805(2008).
CC -!- FUNCTION: Omega-conotoxins act at presynaptic membranes, they bind and
CC block voltage-gated calcium channels (Cav). {ECO:0000250}.
CC -!- SUBCELLULAR LOCATION: Secreted.
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 O1 superfamily. {ECO:0000305}.
CC ---------------------------------------------------------------------------
CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC ---------------------------------------------------------------------------
DR AlphaFoldDB; P0C8V9; -.
DR SMR; P0C8V9; -.
DR ConoServer; 3702; Ac6.5 precursor.
DR GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR GO; GO:0005246; F:calcium channel regulator activity; IEA:UniProtKB-KW.
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 InterPro; IPR012321; Conotoxin_omega-typ_CS.
DR Pfam; PF02950; Conotoxin; 1.
DR PROSITE; PS60004; OMEGA_CONOTOXIN; 1.
PE 1: Evidence at protein level;
KW Calcium channel impairing toxin; Direct protein sequencing; Disulfide bond;
KW Hydroxylation; Ion channel impairing toxin; Knottin; Neurotoxin;
KW Presynaptic neurotoxin; Secreted; Signal; Toxin;
KW Voltage-gated calcium channel impairing toxin.
FT SIGNAL 1..22
FT /evidence="ECO:0000255"
FT PROPEP 23..42
FT /evidence="ECO:0000269|PubMed:18286662"
FT /id="PRO_0000366091"
FT PEPTIDE 43..78
FT /note="Omega-conotoxin-like Ac6.5"
FT /id="PRO_0000366092"
FT MOD_RES 55
FT /note="4-hydroxyproline"
FT /evidence="ECO:0000269|PubMed:18286662"
FT MOD_RES 67
FT /note="4-hydroxyproline"
FT /evidence="ECO:0000269|PubMed:18286662"
FT DISULFID 46..62
FT /evidence="ECO:0000250"
FT DISULFID 53..65
FT /evidence="ECO:0000250"
FT DISULFID 61..72
FT /evidence="ECO:0000250"
SQ SEQUENCE 78 AA; 8479 MW; BE2EAB5438A2C3C8 CRC64;
MKLTCVVIVA VLLLTACQLL TADDSRGTQK HRSLRSTTKV SKATDCIEAG NYCGPTVMKI
CCGFCSPFSK ICMNYPQN