ISSN:
1573-6776
Keywords:
Corynebacterium glutamicum
;
ammonia assimilation
;
glutamate dehydrogenase
;
glutamine synthetase
;
glutamate synthase
Source:
Springer Online Journal Archives 1860-2000
Topics:
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Abstract In the wild-type of Corynebacterium glutamicum, the specific activity of glutamate dehydrogenase (GDH) remained constant at 1.3 U (mg protein)−1 when raising the ammonia (NH4) concentration in the growth medium from 1 to 90 mM. In contrast, the glutamine synthetase (GS) and glutamate synthase (GOGAT) activities decreased from 1.1 U (mg protein)−1 and 42 mU (mg protein)−1, respectively, to less than 10 % of these values at NH4 concentrations 〉 10 mM suggesting that under these conditions the GDH reaction is the primary NH4 assimilation pathway. Consistent with this suggestion, a GDH-deficient C. glutamicum mutant showed slower growth at NH4 concentrations ≥ 10 mM and, in contrast to the wild-type, did not grow in the presence of the GS inhibitor methionine sulfoximine. © Rapid Science Ltd. 1998
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1005406126920
Permalink
