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UniProtKB/Swiss-Prot entry P17684


[Entry info] [Name and origin] [References] [Comments] [Cross-references] [Keywords] [Features] [Sequence] [Tools]

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Entry information
Entry name CXKT_CONTU
Primary accession number P17684
Secondary accession numbers None
Integrated into Swiss-Prot on August 1, 1990
Sequence was last modified on August 1, 1990 (Sequence version 1)
Annotations were last modified on    February 26, 2008 (Entry version 53)
Name and origin of the protein
Protein name Conantokin-T
Synonym Con-T
Gene name None
From
Conus tulipa (Fish-hunting cone snail) (Tulip cone) [TaxID: 6495] 
Taxonomy Eukaryota; Metazoa; Mollusca; Gastropoda; Orthogastropoda; Apogastropoda; Caenogastropoda; Sorbeoconcha; Hypsogastropoda; Neogastropoda; Conoidea; Conidae; Conus.
Protein existence 1: Evidence at protein level;
References
[1]
PROTEIN SEQUENCE.
TISSUE=Venom;
PubMed=2180939 [NCBI, ExPASy, EBI, Israel, Japan]
Haack J.A., Rivier J.E., Parks T.N., Mena E.E., Cruz L.J., Olivera B.M.;
"Conantokin-T. A gamma-carboxyglutamate containing peptide with N-methyl-D-aspartate antagonist activity.";
J. Biol. Chem. 265:6025-6029(1990).
[2]
FUNCTION.
PubMed=2165278 [NCBI, ExPASy, EBI, Israel, Japan]
Olivera B.M., Rivier J., Clark C., Ramilo C.A., Corpuz G.P., Abogadie F.C., Mena E.E., Woodward S.R., Hillyard D.R., Cruz L.J.;
"Diversity of Conus neuropeptides.";
Science 249:257-263(1990).
[3]
MUTAGENESIS OF TYR-5.
DOI=10.1074/jbc.M102428200; PubMed=11335724 [NCBI, ExPASy, EBI, Israel, Japan]
Klein R.C., Prorok M., Galdzicki Z., Castellino F.J.;
"The amino acid residue at sequence position 5 in the conantokin peptides partially governs subunit-selective antagonism of recombinant N-methyl-D-aspartate receptors.";
J. Biol. Chem. 276:26860-26867(2001).
[4]
THERAPEUTIC USAGE.
DOI=10.1016/S0304-3959(02)00303-2; PubMed=12507705 [NCBI, ExPASy, EBI, Israel, Japan]
Malmberg A.B., Gilbert H., McCabe R.T., Basbaum A.I.;
"Powerful antinociceptive effects of the cone snail venom-derived subtype-selective NMDA receptor antagonists conantokins G and T.";
Pain 101:109-116(2003).
[5]
STRUCTURE BY NMR.
DOI=10.1016/S0014-5793(97)00573-5; PubMed=9247135 [NCBI, ExPASy, EBI, Israel, Japan]
Warder S.E., Chen Z., Zhu Y., Prorok M., Castellino F.J., Ni F.;
"The NMR solution structure of the NMDA receptor antagonist, conantokin-T, in the absence of divalent metal ions.";
FEBS Lett. 411:19-26(1997).
[6]
STRUCTURE BY NMR.
DOI=10.1074/jbc.272.4.2291; PubMed=8999936 [NCBI, ExPASy, EBI, Israel, Japan]
Skjaerbaek N., Nielsen K.J., Lewis R.J., Alewood P.F., Craik D.J.;
"Determination of the solution structures of conantokin-G and conantokin-T by CD and NMR spectroscopy.";
J. Biol. Chem. 272:2291-2299(1997).
Comments
  • FUNCTION: Inhibits both NR2A and NR2B subunits of N-methyl-D-aspartate (NMDA) receptor-mediated calcium influx in central nervous system neurons. Induces sleep-like symptoms in young mice and hyperactivity in older mice.
  • SUBCELLULAR LOCATION: Secreted.
  • TISSUE SPECIFICITY: Expressed by the venom duct.
  • PHARMACEUTICAL: Is under phase II clinical trial by Cognetix Inc. Has potent antinociceptive effects in several models of injury-induced pain.
  • SIMILARITY: Belongs to the conantokin family.
Copyright
Copyrighted by the UniProt Consortium, see http://www.uniprot.org/terms. Distributed under the Creative Commons Attribution-NoDerivs License.
Cross-references
Sequence databases
PIR A35225; A35225.
3D structure databases
PDB
1ONT; NMR; -; A=1-21.[ExPASy / RCSB / EBI]
PDBsum 1ONT; -.
ModBase P17684.
Family and domain databases
InterPro IPR005918; Conantokin_CS.
Graphical view of domain structure.
PROSITE PS60025; CONANTOKIN; 1.
BLOCKS P17684.
Other
ProtoNet P17684.
UniRef View cluster of proteins with at least 50% / 90% / 100% identity.
Keywords
3D-structure; Amidation; Calcium; Direct protein sequencing; Gamma-carboxyglutamic acid; Pharmaceutical; Secreted; Toxin.
Features
SEVIEWER logo Feature table viewer
KeyFrom  To Length Description FTId
PEPTIDE   1   21  21     Conantokin-T. PRO_0000044504
SITE   5    5  1     Important for selectivity. 
MOD_RES   3    3        4-carboxyglutamate. 
MOD_RES   4    4        4-carboxyglutamate. 
MOD_RES   10   10        4-carboxyglutamate. 
MOD_RES   14   14        4-carboxyglutamate. 
MOD_RES   21   21        Alanine amide. 
MUTAGEN   5    5        Y->F: No loss of inhibition of NR1a/NR2B receptor; little loss of inhibition of NR1a/NR2A receptor. 
MUTAGEN   5    5        Y->V: Little loss of inhibition of NR1a/NR2B receptor; important loss of inhibition of NR1a/NR2A receptor. 
MUTAGEN   5    5        Y->W: Little loss of inhibition of NR1a/NR2B receptor; complete loss of inhibition of NR1a/NR2A receptor. 
HELIX   2   15  14      
HELIX   17   20  4      
Sequence information
Length: 21 AA [This is the length of the unprocessed precursor] Molecular weight: 2509 Da [This is the MW of the unprocessed precursor] CRC64: 7F7B893AC4842C38 [This is a checksum on the sequence]
        10         20 
GEEEYQKMLE NLREAEVKKN A 

P17684 in FASTA format

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