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Influence of the growth rate on the activities of some enzymes of the nitrogen metabolism in chemostat cultures of candida diddensii and candida tropicalis



Influence of the growth rate on the activities of some enzymes of the nitrogen metabolism in chemostat cultures of candida diddensii and candida tropicalis



Acta Microbiologica Bulgarica 23: 34-39



The experiments were carried out with fodder yeasts of the strain C. diddensii 74-10 and C. tropicalis P-70 cultivated under nitrogen limitation at dilution rates (D) 0,1; 0,2; 0,3 h-3. The activities of some enzymes of the primary nitrogen oxidation glutamate dehydrogenase (NADPH) and NADH-dependent), glutatmine synthetase, glutama'e synthase and alanine dehydrogenase were studied in relation to the growth rate (.mu.). It was established that under ammonia limitation the metabolism of the strain C. didensii 74-10 was reorganized with the increase of the growth rate by decreasing the activity of NADPH-glutamate dehydrogenase and by activating the system glutamine synthetase/glutamate synthase. The increase of the growth rate from 0,1 to 0,3 h-3 for C. tropicalis P-70 was accompanied with an increase in the enzyme activities of NADPH-glutamate dehydrogenase 1,25 times; glutamine synthetase 1,5; gluamate synthase 1,9 and alanine dehydrogenase 2,2 times. The changes in the enzyme activities observed were caused also by the different exchange of energy characterizing the microorganisms investigated.

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Accession: 007460186

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