Abstract
Glutamine synthetase (GS), glutamate synthase (GOGAT), glutamate dehydrogenase (GDH), alanine dehydrogenase (ADH) and alanine aminotransferase (GPT) were detected in the cell-free homogenate ofStreptomyces avermitilis grown in a defined medium containing ammonium sulfate as the only nitrogen source. At an initial NH4 + concentration of 7.5 mmol/L, high activities of GS, GOGAT and GDH were found while that of ADH was low. The ADH activity was markedly increased at initially millimolar NH4 + concentrations. In some characteristics of its NH4 +-assimilating system (e.g. control of some enzyme activities, the NADPH specificity of GOGAT, the presence of alanine aminotransferase),S. avermitilis differs from other known streptomycetes.
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