Abstract
Despite the great physiological importance of glutamate dehydrogenases (GDHs) fromChlorella, practically no pertinent data were available until 1965. We made an attempt to fill the gap and to determine the forms of GDH present inChlorella cells, the dependence of their synthesis on the nitrogen source, their physico-chemical and kinetic properties and their functional features in the cell. The thermophilic strainChlorella pyrenoidosa Pringsheim 82 T was selected for this purpose because it was shown to have both NAD- and NADP-GDH activities, the NADP-GDH activity being much higher under conditions of NH 4 + assimilation than in NO 3 - assimilation. Our findings allow the following conclusions to be made:
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