tetrodotoxin   Click here for help

GtoPdb Ligand ID: 2616

Synonyms: TTX
Compound class: Natural product or derivative
Comment: Tetrodotoxin is a potent neurotoxin found in certain fish and other aquatic animals, although it is actually produced in symbiotic bacteria hosted in these creatures.
There is some ambiguity in the literature and on other databases as to the exact stereochemistry of tetrodotoxin. Our structure matches that on ChEBI and the PubChem entry linked to above, while the compound is also represented by the alternative isomer in CHEMBL507974 and CID 11174599.
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Ligand Activity Visualisation Charts

These are box plot that provide a unique visualisation, summarising all the activity data for a ligand taken from ChEMBL and GtoPdb across multiple targets and species. Click on a plot to see the median, interquartile range, low and high data points. A value of zero indicates that no data are available. A separate chart is created for each target, and where possible the algorithm tries to merge ChEMBL and GtoPdb targets by matching them on name and UniProt accession, for each available species. However, please note that inconsistency in naming of targets may lead to data for the same target being reported across multiple charts.

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View interactive charts of activity data across species

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View more information in the IUPHAR Pharmacology Education Project: tetrodotoxin

2D Structure
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2D Structure

An image of the ligand's 2D structure. For small molecules with SMILES these are drawn using the NCI/CADD Chemical Identifier Resolver. Click on the image to access the chemical structure search tool with the ligand pre-loaded in the structure editor. For other types of ligands, e.g. longer nucleotides and peptides, a manually drawn representation of the molecule may be provided.

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Physico-chemical Properties
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Physico-chemical Properties

Calculated molecular properties are available for small molecules and natural products (not peptides). Properties were generated using the CDK toolkit. All properties were selected to enable the prediction of the Lipinski Rule-of-Five profile or ‘druglikeness’ for each ligand. For more info on each category see the help pages.

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Hydrogen bond acceptors 11
Hydrogen bond donors 8
Rotatable bonds 1
Topological polar surface area 190.25
Molecular weight 319.1
XLogP -3.58
No. Lipinski's rules broken 2
SMILES / InChI / InChIKey
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SMILES / InChI / InChIKey

SMILES (Simplified Molecular Input Line Entry Specification) A specification for unambiguously describing the structure of chemical molecules using short ASCII strings. Canonical SMILES specify a unique representation of the 2D structure without chiral or isotopic specifications. Isomeric SMILES include chiral specification and isotopes.

Standard InChI (IUPAC International Chemical Identifier) and InChIKey InChI is a non-proprietary, standard, textual identifier for chemical substances designed to facilitate linking of information and database searching. An InChIKey is a simplified version of a full InChI, designed for easier web searching.

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Canonical SMILES OCC1(O)C2OC3(OC1C1C(C2O)(C3O)NC(=NC1O)N)O
Isomeric SMILES OC[C@@]1(O)[C@H]2O[C@]3(O[C@@H]1[C@H]1[C@@]([C@H]2O)([C@@H]3O)NC(=N[C@@H]1O)N)O
InChI InChI=1S/C11H17N3O8/c12-8-13-6(17)2-4-9(19,1-15)5-3(16)10(2,14-8)7(18)11(20,21-4)22-5/h2-7,15-20H,1H2,(H3,12,13,14)/t2-,3+,4-,5+,6-,7+,9+,10-,11+/m1/s1
InChI Key CFMYXEVWODSLAX-QYIGHCJRSA-N
No information available.
Summary of Clinical Use Click here for help
Subcutaneous tetrodotoxin has been evaluated in a Phase 3 clinical trial for its capacity to alleviate moderate to severe inadequately controlled cancer-related pain (NCT00725114).
Mechanism Of Action and Pharmacodynamic Effects Click here for help
Mechanistically, tetrodotoxin blocks voltage-gated sodium channels to prevent the rising phase of the action potential. Tetrodotoxin poisoning causes loss of sensation, paralysis of voluntary muscles including the diaphragm and intercostal muscles which compromises respiration. Tetrodotoxin poisoning is serious but not always fatal.
Clinical Trials
Clinical Trial ID Title Type Source Comment References
NCT00725114 Safety & Efficacy Study of Subcutaneous Tetrodotoxin for Moderate to Severe Inadequately Controlled Cancer-related Pain Phase 3 Interventional Wex Pharmaceuticals Inc.