Abstract
The existence of factors mediating dithiothreitol (DTT) activation of sorghum (C 4 plant) leaf NADP malate dehydrogenase has been shown. However, it seemed that the enzyme can be directly activated by the dithiol but with a lower magnitude. A treatment with pronase established the proteic nature of the factors. By chromatography on a DEAE cellulose column, at least three peaks of activity were identified. This elution profile was different from that obtained in the case of a C 3 plant (French bean). Nevertheless, a cross experiment between enzymes and factors from the two types of plants indicated that they are interchangeable with regard to the activation process.
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