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Plant Physiology 62:22-25 (1978)
© 1978 American Society of Plant Biologists

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Articles

Oxidation of Proline by Plant Mitochondria 1

Samuel F. Boggess and David E. Koeppe

Cecil R. Stewart

Department of Agronomy, University of Illinois, Urbana, Illinois 61801, Department of Botany and Plant Pathology, Iowa State University, Ames, Iowa 50010

Mitochondria isolated from etiolated shoots of corn (Zea mays), wheat (Triticum aestivum), barley (Hordeum vulgare), soybean (Glycine max L. Merr.), and mung bean (Phaseolus aureus) exhibited a proline-dependent O2 uptake subject to respiratory control. ADP/O ratios with proline as substrate were intermediate between ratios obtained with exogenous NADH and malate + pyruvate as substrates. Isotope studies showed proline metabolism to be dependent on O2, but not NAD. The major ninhydrin-positive product formed via {Delta}1-pyrroline-5-carboxylic acid was glutamate. Mitochondria were capable of further metabolism of glutamate, as radioactive CO2, organic acids, and aspartate were recovered after [14C]proline feeding experiments. These results demonstrate the mitochondrial association and O2 dependence of plant proline metabolism.

1 This work was supported by the Illinois Agricultural Experiment Station and the Iowa State University Graduate College.




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S. Mani, B. Van de Cotte, M. Van Montagu, and N. Verbruggen
Altered Levels of Proline Dehydrogenase Cause Hypersensitivity to Proline and Its Analogs in Arabidopsis
Plant Physiology, January 1, 2002; 128(1): 73 - 83.
[Abstract] [Full Text] [PDF]


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Copyright © 1978 by the American Society of Plant Biologists