Plant Physiol. Drug Metab Dispos
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Plant Physiology 69:602-608 (1982)
© 1982 American Society of Plant Biologists

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Articles

Catabolism of Porphobilinogen by Etiolated Barley Leaves 1

Jeffrey X. Duggan2, Erna Meller and Merrill L. Gassman

Department of Biological Sciences, University of Illinois at Chicago Circle, P.O. Box 4348, Chicago, Illinois 60680

When [2,4-14C]porphobilinogen (PBG) or [2 (aminomethyl),5-14C]PBG is administered to etiolated barley (Hordeum vulgare L. var. Larker) leaves in darkness, label becomes incorporated into CO2, organic and amino acids, sugars, lipids, and proteins during a 4-hour incubation. Less than 1% of the label, however, is incorporated into porphyrins. The rate of 14CO2 evolution from leaves fed [2,4-14C]PBG is strongly inhibited by anaerobiosis but is unaffected by aminooxyacetic acid, while the rate of 14CO2 evolution from [2(aminomethyl),5-14C]PBG is strongly inhibited by aminooxyacetic acid but is not affected by anaerobiosis.

These results suggest that: (a) exogenous PBG is taken up and metabolized by etiolated barley leaves; (b) PBG is not metabolized exclusively to porphyrins but can be converted to a variety of intermediary metabolites; (c) this metabolism involves reactions which are partially dependent upon O2 and pyridoxal phosphate.

2 Present address: The Perkin-Elmer Corp., Oakbrook Instrument Division, 2000 York Road, Oakbrook, IL 60521.

1 Supported by National Science Foundation Grants PCM 76-02308 and PCM 79-01605 and a grant from the University of Illinois at Chicago Circle Research Board to M. L. G. These studies formed a part of a thesis submitted by J. X. D. to the Graduate College of the University of Illinois at Chicago Circle in partial fulfillment of the requirements for the PhD degree.






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