Role of Glycine and Glyoxylate Decarboxylation in Photorespiratory CO(2) Release |
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Authors: | Oliver D J |
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Affiliation: | Department of Bacteriology and Biochemistry, University of Idaho, Moscow, Idaho 83843. |
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Abstract: | Mechanically isolated soybean leaf cells metabolized added glycolate by two mechanisms, the direct oxidation of glyoxylate and the decarboxylation of glycine. The rate of glyoxylate oxidation was dependent on the cellular glyoxylate concentration and was linear between 0.58 and 2.66 micromoles glyoxylate per milligram chlorophyll. The rate extrapolated to zero at a concentration of zero. The concentration and, therefore, the rate of oxidation of glyoxylate could be decreased by adding glutamate or serine to the cells. These substrates were amino donors for the transamination of glyoxylate to glycine. In the presence of these amino acids more CO2 was released from added glycolate via the glycine decarboxylation reaction and less by the direct oxidation of glyoxylate. |
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