Literature summary for 3.1.1.11 extracted from

van Alebeek, G.J.; van Scherpenzeel, K.; Beldman, G.; Schols, H.A.; Voragen, A.G.
Partially esterified oligogalacturonides are the preferred substrates for pectin methylesterase of Aspergillus niger (2003), Biochem. J., 372, 211-218.

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Natural Substrates/ Products (Substrates)

Natural Substrates	Organism	Comment (Nat. Sub.)	Natural Products	Comment (Nat. Pro.)	Rev.	Reac.
pectin + H2O	Aspergillus niger	-	methanol + pectate	-	?

Organism

Organism	UniProt	Comment	Textmining
Aspergillus niger	-	-	-

Substrates and Products (Substrate)

Substrates	Comment Substrates	Organism	Products	Comment (Products)	Rev.	Reac.
methyl-esterfied oligogalacturonides + H2O	C6- and C1-substituted. De-esterification proceeds via a specific pattern, depending on the degree of polymerization. Initially, a first methyl ester of the oligomer is hydrolysed, resulting in one free carboxyl group. Subsequently this first product is preferred as a substrate and is de-esterified for a second time. This product is then accumulated and hereafter de-esterified further to the final product. The saturated hexamer is an exception to this: three methyl esters are removed very rapidly instead of two methyl esters.	Aspergillus niger	?	-	?
pectin + H2O	-	Aspergillus niger	methanol + pectate	-	?

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Release 2023.1 (January 2023)