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Plant and Cell Physiology, 1981, Vol. 22, No. 5 781-787
© 1981

Article

Biosynthesis of Aryl Carotenoids: Studies on the Nature of the Precyclization Intermediate

Leslie Sise Leutwiler1 and D.J. Chapman

Department of Biology, University of California Los Angeles, California 90024, U.S.A.

The conversion of nicotine-induced pools of radioactive lycopene-14C into chlorobactene was studied in Chlorobium limicola. Removal of the nicotine and resuspension of cells in radioactivity-free medium in the absence or presence of diphenylamine (to prevent further carotenoid synthesis) indicates that.the lycopene is metabolized to chlorobactene. Results suggest that some older lycopene molecules, in the presence of nicotine, become inaccessible to the carotenogenic enzymes, and are not further metabolized upon removal of the inhibitor. Leucine is not effectively incorporated into carotenoids in C. limicola.

1Present address: Division of Biology, California Institute of Technology, Pasadena, California 91125, U.S.A.

(Received November 20, 1981; Accepted May 5, 1981)
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