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    The database and ontology of Chemical Entities of Biological Interest

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07 July 2014 - ChEBI release 117 is now available

ChEBI release 117 is now available, with 39744 fully annotated entities.

See our entity of the month, Tetrodotoxin.
A bacterial metabolite that is about 100 times more poisonous than cyanide.

http://www.ebi.ac.uk/chebi/entityMonthForward.do

With kind regards,
the ChEBI team

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02 June 2014 - ChEBI release 116 is now available

ChEBI release 116 is now available, with 39143 fully annotated entities.

See our entity of the month, Vitamin E
http://www.ebi.ac.uk/chebi/entityMonthForward.do

As a result of feedback received at the recent ChEBI workshop, the ontology roles 'primary metabolite' and 'secondary metabolite' have now been merged as 'metabolite' (CHEBI:25212).

With kind regards,
the ChEBI team

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Entity of the month
7th July 2014
Tetrodotoxin

Tetrodotoxin (CHEBI:9506), commonly abbreviated to TTX, is a low molecular weight neurotoxin characteristically distributed in both terrestrial and marine animal kingdoms [1]. It derives its name from Tetraodontiformes (tetras-four and odontos-tooth), an order that includes pufferfish, porcupinefish, ocean sunfish and several other such species in which the toxin is found. TTX is generally present in the gonads, liver, intestines and skin of these species, the amount fluctuating according to the species, region and seasonal variations [2]. Although TTX is found in these fish and other animals (e.g. gastropods, newts, blue-ringed octopuses etc.), studies have revealed that it is actually synthesised by endo-symbiotic bacteria (e.g. Pseudoalteromonas tetraodonis, certain species of Pseudomonas and Vibrio, etc.) that naturally inhabit the gut of the animal. It has been proposed that the animal initially acquires the TTX-producing bacteria via the food web [3].

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Chemical Entities of Biological Interest (ChEBI) is a freely available dictionary of molecular entities focused on ‘small’ chemical compounds.
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