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Plant Physiology 47:483-487 (1971)
© 1971 American Society of Plant Biologists

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The Conversion of D-Tryptophan to L-Tryptophan in Cell Cultures of Tobacco 1

George A. Miura2 and Stanley E. Mills

a Department of Biology, University of California, San Diego, La Jolla, California 92037

D-Tryptophan was converted to L-tryptophan in tissue cultures of tobacco, in whole cells treated with dimethylsulfoxide, and in cell-free extracts treated by Sephadex G-25 filtration. Evidence was obtained that tryptophanase, tryptophan pyrrolase, and transaminase activities were not involved. The data were best explained by the presence of a tryptophan racemase as the enzyme catalyzing the reaction. The possible role of D-tryptophan in the biosynthesis of indoleacetic acid is discussed.

2 Present address: Department of Biochemistry, McMaster University, Hamilton, Ontario, Canada.

1 This investigation was supported by Contract AT(11-1)-34 from the Atomic Energy Commission.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1971 by the American Society of Plant Biologists