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Plant Physiology 83:657-658 (1987)
© 1987 American Society of Plant Biologists

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Metabolism and Enzymology

Site of Synthesis of the Enzymes of the Pyrimidine Biosynthetic Pathway in Oat (Avena sativa L.) Leaves 1

Holly D. Doremus2 and André T. Jagendorf

Section of Plant Biology, Cornell University, Ithaca, New York 14853

Heat-bleached oat (Avena sativa L. cv Porter) leaves lacking 70S chloroplast ribosomes have been used to demonstrate that four chloroplast-localized enzymes of pyrimidine nucleotide biosynthesis: aspartate carbamoyl-transferase, dihydroorotase, orotidine phosphoribosyl-transferase, and orotidine-5'-phosphate decarboxylase, are synthesized on cytoplasmic ribosomes. Two other chloroplast enzymes, carbamoyl phosphate synthetase, involved in both pyrimidine and arginine biosynthesis, and ornithine carbamoyltransferase, an enzyme of arginine biosynthesis, were also shown to be made on 80S ribosomes.

2 Current address: Agronomy Department, 310 Curtis Hall, University of Missouri-Columbia, Columbia, MO 65211.

1 Supported by grant PCM 8304418 from the National Science Foundation.






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Copyright © 1987 by the American Society of Plant Biologists