Abstract
Chlorella sorokiniana possesses two forms of nitrate reductase (EC 1.6.6.1.). One with low activity is present in cells at the end of the light-dark cycle, the other with high activity is present after 1 h of illumination. The two forms can be distinguished by gel electrophoresis, isopycnic centrifugation, assay of the partial reactions and their sensitivity to antibodies, respectively. These differences are discussed with respect to an effect of intracellular nitrate on the activation of nitrate reductase.
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