title: Rationalization and in vitro modeling of the chemical mechanisms of the enzymatic oxidation of phenolic compounds in planta: from flavonols and stilbenoids to lignins.
abstract: Enzymatic oxidation of phenolic compounds is a widespread phenomenon in plants. It is responsible for the formation of many oligomers and polymers, which are generally described as the result of a combinatorial coupling of the different radicals formed through oxidation of the phenol group and delocalization of the radical. We focused our interest on several phenolic compounds that are present in plants and known to form, under enzymatic oxidation, oligomers with different type of linkages between monomers. To explain this diversity of inter-monomer linkages and their variation according to the experimental procedure used for the enzymatic oxidation, we report an alternative mechanistic pathway involving dismutation of the radicals, leading to the formation of carbocations which, thereafter, react with nucleophilic species present in the medium. This alternative pathway allows the understanding of peculiar linkages between monomeric units in the oligomer and offers new insights for understanding the formation of phenolic biopolymers in plants.
authors.affiliation: UMR1318 Inra/AgroParisTech, IJPB, Route de Saint-Cyr 78026 Versailles Cedex, France.
authors.forename: Betty
authors.initials: B
authors.lastname: Cottyn
authors.forename: Albert
authors.initials: A
authors.lastname: Kollmann
authors.forename: Pierre
authors.initials: P
authors.lastname: Waffo-Teguo
authors.forename: Paul-Henri
authors.initials: PH
authors.lastname: Ducrot
mesh_terms: D044948:Flavonols / Q000737:chemistry* / Q000378:metabolism; D008031:Lignin / Q000737:chemistry* / Q000378:metabolism; D008958:Models, Molecular; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry* / Q000378:metabolism; D010944:Plants / Q000737:chemistry / Q000201:enzymology / Q000378:metabolism; D013237:Stereoisomerism; D013267:Stilbenes / Q000737:chemistry* / Q000378:metabolism
chemical_list: D044948:Flavonols; D010636:Phenols; D013267:Stilbenes; D008031:Lignin