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The involvement of glutamate dehydrogenase and glutamine synthetase/glutamate synthase in ammonia assimilation by Stropharia semiglobata

The involvement of glutamate dehydrogenase and glutamine synthetase/glutamate synthase in ammonia assimilation by Stropharia semiglobata
chair:

Schwartz, T. / Binkusnan, M. / Fock, H. (1991)

place:

Journal of General Microbiology 137 (1991), 2253-2258

Date: 1991

Schwartz, T. / Binkusnan, M. / Fock, H. (1991): „The involvement of glutamate dehydrogenase and glutamine synthetase/glutamate synthase in ammonia assimilation by Stropharia semiglobata“. In: Journal of General Microbiology 137 (1991), 2253-2258

Abstract

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Summary: When grown on ammonia as sole nitrogen source, the basidiomycete fungus Stropharia semiglobata assimilated nitrogen via glutamate dehydrogenase (GDH). The two isoenzymes of GDH were both repressed by increasing concentrations of ammonia, but NADP-GDH (EC 1.4.1.4) was far more active than NAD-GDH (EC 1.4.1.2).

Glutamine synthetase (GS; EC 6.3.1.2) and glutamate synthase (GOGAT; EC 1.4.7.1) were also active in S. semiglobata and these enzyme activities were independent of the ammonia concentration in the suspension. From enzyme activity and 1 5N-labelling studies of amino acids, it is concluded that both GDH and GS/GOGAT contribute to ammonia assimilation in this fungus.