Nitrogenase switch-off and regulation of ammonium assimilation in response to light deprivation in Rhodospirillum rubrum are influenced by the nitrogen source used during growth.
Nitrogen fixation and ammonium assimilation in Rhodospirillum rubrum are regulated in response to changes in light availability, and we show that the response in terms of glutamine synthetase activity and P(II) modification is dependent on the nitrogen source used for growth, N(2) or glutamate, although both lead to nitrogenase derepression.
Teixeira
Pedro Filipe
PF
Department of Biochemistry and Biophysics, Stockholm University, SE-106 91 Stockholm, Sweden.
Wang
He
H
Nordlund
Stefan
S
D015964:Gene Expression Regulation, Bacterial; D015971:Gene Expression Regulation, Enzymologic; D005974:Glutamate-Ammonia Ligase / Q000378:metabolism; D018698:Glutamic Acid / Q000378:metabolism; D008027:Light; D009584:Nitrogen / Q000378:metabolism; D009591:Nitrogenase / Q000378:metabolism*; D000644:Quaternary Ammonium Compounds / Q000378:metabolism*; D012247:Rhodospirillum rubrum / Q000502:physiology* / Q000528:radiation effects*
D000644:Quaternary Ammonium Compounds; D018698:Glutamic Acid; D009591:Nitrogenase; D005974:Glutamate-Ammonia Ligase; D009584:Nitrogen