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Plant Physiology 94:209-213 (1990)
© 1990 American Society of Plant Biologists

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Metabolism and Enzymology

Formation of cis-Coniferin in Cell-Free Extracts of Fagus grandifolia Ehrh Bark 1

Etsuo Yamamoto, Ma. Estela J. Inciong, Laurence B. Davin and Norman G. Lewis2

Department of Wood Science and Forest Products, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061

American beech (Fagus grandifolia Ehrh) bark exclusively accumulates cis-monolignols and their glucosidic conjugates; no evidence for the accumulation of trans-monolignols has been found. The glucosyltransferase from this source exhibits a very unusual substrate specificity for cis, and not trans, monolignols. This is further evidence that cis monolignols are involved in lignin formation in these plant tissues. Preliminary evidence for the existence of a novel trans-cis monolignol isomerase was obtained, in agreement with our contention that this isomerization is not photochemically mediated.

2 Correspondence should be addressed to: Norman G., Lewis, Institute of Biological Chemistry, Washington State University, Pullman, WA 99164.

1 The authors thank the U.S. Department of Energy (Grant DE-FG05-88-ER13883) for financial assistance.






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Copyright © 1990 by the American Society of Plant Biologists