Journal
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1
Volume -, Issue 22, Pages 2939-2945Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b107219f
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Perturbing the lignin biosynthetic pathway provides a tool for understanding the complex process of lignification. Caffeic acid O-methyltransferase (COMT) is required to produce syringyl units in lignins. Down-regulating the expression of its gene in poplar dramatically affects the lignin composition. 2D and 3D NMR investigations detail structural differences between lignins from a control and COMT-deficient poplars obtained by means of two independent transformation techniques. This rst application of 3D NMR to natural abundance lignins reveals the full side-chain network and provides diagnostic evidence for the intimate incorporation of 5-hydroxyconiferyl alcohol into the lignins to form novel benzodioxanes as major structures. The flexibility of a plant to utilize novel monomers to produce functional lignins provides opportunities for engineering the structure and affecting the consequent properties of lignins.
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