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Polymerization of monolignols by redox shuttle-mediated enzymatic oxidation: A new model in lignin biosynthesis I
KTH, Superseded Departments, Pulp and Paper Technology.
KTH, Superseded Departments, Pulp and Paper Technology.
KTH, Superseded Departments, Pulp and Paper Technology.
2002 (English)In: The Plant Cell, ISSN 1040-4651, E-ISSN 1532-298X, Vol. 14, no 8, 1953-1962 p.Article in journal (Refereed) Published
Abstract [en]

Lignin is one of the most abundant biopolymers, and it has a complex racemic structure. It may be formed by a radical polymerization initiated by redox enzymes, but much remains unknown about the process, such as how molecules as large as enzymes can generate the compact structure of the lignified plant cell wall. We have synthesized lignin oligomers according to a new concept, in which peroxidase is never in direct contact with the lignin monomers coniferaldehyde and coniferyl alcohol. Instead, manganese oxalate worked as a diffusible redox shuttle, first being oxidized from Mn(II) to Mn(III) by a peroxidase and then being reduced to Mn(II) by a simultaneous oxidation of the lignin monomers to radicals that formed covalent linkages of the lignin type. Furthermore, a high molecular mass polymer was generated by oxidation of coniferyl alcohol by Mn(III) acetate in a dioxane and water mixture. This polymer was very similar to natural spruce wood lignin, according to its NMR spectrum. The possible involvement of a redox shuttle/peroxidase system in lignin biosynthesis is discussed.

Place, publisher, year, edition, pages
2002. Vol. 14, no 8, 1953-1962 p.
Keyword [en]
p-hydroxycinnamyl alcohols, transition-metal salts, wood, thioacidolysis
Identifiers
URN: urn:nbn:se:kth:diva-21842DOI: 10.1105/tpc.001487ISI: 000177604700020OAI: oai:DiVA.org:kth-21842DiVA: diva2:340540
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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CiteExportLink to record
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