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Regulation of glutamine metabolism in chlorella pyrenoidosa regulation of glutamine synthetase ec activity by adenylic system components

, : Regulation of glutamine metabolism in chlorella pyrenoidosa regulation of glutamine synthetase ec activity by adenylic system components. Biokhimiya 42(5): 947-951

A decrease of glutamine synthetase (EC activity was observed under the assimilation of ammonium N in Chlorella; a decrease of ATP content also took place. The ATP content was 7-fold decreased, while ADP and AMP contents were 4-fold and 3-fold increased, respectively, after 15 min of Chlorella incubation on ammonium medium. Further incubation for 45 min, resulted in a gradual increase of ATP content and in a decrease of ADP and AMP contents. The value of energy charge in ammonium assimilating Chlorella cells sharply decreased for the first 15 min of incubation and then it normalized gradually. The experiments with glutamine synthetase preparation, isolated from ammonium assimilating cells, showed that ADP and AMP are strong inhibitors of the enzyme in the presence of Mg2+ and only ADP produces the inhibitory effect in the presence of Mn2+. No enzyme reactivation was observed after the transfer of ammonium assimilating cells into N-free medium or nitrate medium, the enzyme activity increasing at the expense of enzyme protein synthesis de novo.

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