Ammonia and light effect on nitrogenase activity in nitrogen-limited continuous cultures of Rhodopseudomonas capsulata. Role of glutamine synthetase

1984 ◽  
Vol 139 (4) ◽  
pp. 326-331 ◽  
Author(s):  
Yves Jouanneau ◽  
Stephan Lebecque ◽  
Paulette M. Vignais
Keyword(s):  
Glutamine Synthetase ◽  
Nitrogenase Activity ◽  
Rhodopseudomonas Capsulata ◽  
Light Effect ◽  
Continuous Cultures

scholarly journals Regulation of nitrogenase A and R concentrations in Rhodopseudomonas capsulata by glutamine synthetase

1980 ◽  
Vol 187 (1) ◽  
pp. 273-276 ◽  
Author(s):  
D C Yoch
Keyword(s):  
Glutamine Synthetase ◽  
Nitrogenase Activity ◽  
Photosynthetic Bacterium ◽  
Rhodopseudomonas Capsulata ◽  
Wild Type ◽  
Sulphur Bacteria ◽  
Intracellular Concentrations ◽  
Methionine Sulphoximine ◽  
Negative Mutant

Nitrogen-starved purple non-sulphur bacteria have an active unregulated form of nitrogenase (nitrogenase A); however, the nitrogenase of a glutamine synthetase-negative mutant of Rhodopseudomonas capsulata, when nitrogen-starved, was predominantly inactive and required activation by Mn2+ and activating-factor protein. This regulatory form of nitrogenase has been called nitrogenase R. Treatment of wild-type cells (containing nitrogenase A) with methionine sulphoximine, an inhibitor of glutamine synthetase, converted the enzyme into nitrogenase R. Glutamine synthetase thus appears to control the intracellular concentrations of nitrogenase A and R and in this way regulates nitrogenase activity in the photosynthetic bacterium.

Immunoelectrophoretic approach to the metabolic regulation of glutamine synthetase in Rhodopseudomonas capsulata E1F1: role of glutamine

1985 ◽  
Vol 143 (2) ◽  
pp. 111-116 ◽  
Author(s):  
Francisco Romero ◽  
Francisco Javier Caballero ◽  
Francisco Castillo ◽  
Jos� Manuel Rold�n
Keyword(s):  
Glutamine Synthetase ◽  
Metabolic Regulation ◽  
Rhodopseudomonas Capsulata

scholarly journals The Overexpression of Glutamine Synthetase in Transgenic Poplar: A Review

2006 ◽  
Vol 55 (1-6) ◽  
pp. 278-284 ◽  
Author(s):  
E. G. Kirby ◽  
F. Gallardo ◽  
H. Man ◽  
R. El-Khatib
Keyword(s):  
Glutamine Synthetase ◽  
Woody Plant ◽  
Forest Tree ◽  
Considerable Effort ◽  
Physiological Mechanisms ◽  
Enhanced Resistance ◽  
Enhanced Expression ◽  
Use Efficiency

Abstract In investigating the pivotal role of glutamine synthetase in woody plant development, we have strived to develop an understanding of the biochemical and physiological mechanisms whereby enhanced expression of glutamine synthetase (GS) in poplar contributes to vegetative growth through enhanced nitrogen use efficiency. Considerable effort has also centered on characterization of enhanced resistance of transgenic GS overexpressor lines to abiotic stresses and proposed mechanisms. This summary of our work also focuses on future applications in forest tree improvement.

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