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ebi-chebi / ChEBI

Chemical Entities of Biological Interest (ChEBI) is a freely available dictionary of molecular entities focused on ‘small’ chemical compounds.
https://www.ebi.ac.uk/chebi
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Pectin and Pectate (CHEBI:17309 and CHEBI:68837) do not correspond #4475

Open JervenBolleman opened 8 months ago

JervenBolleman commented 8 months ago

The description of these and hierarchies are inconsistent and lead to strange conclusions.

I suggest that the pectate description is updated to match the pectin one. That for both pectate and pectin mol files/images are deleted.

For pectate the description might be something like

Any mixture of complex, colloidal, macromolecular plant galacturonans containing a large proportion of D-galactopyranosyluronic acid residues in α-(1→4) linkage, of which the deprotonated carboxy groups have been of which may be esterified to varying degrees by methyl groups or be partially or completely converted into salts.

cmungall commented 1 month ago

I'm also confused by this. These are related by conjugate base/acid relations, which is consistent with the current text definition, but I think the relationship between pectin and pectate is one of de-esterification