Nitrogenase switch-off by ammonium ions in Azospirillum brasilense requires the GlnB nitrogen signal-transducing protein.
Appl Environ Microbiol
; 71(9): 5637-41, 2005 Sep.
Article
em En
| MEDLINE
| ID: mdl-16151168
ABSTRACT
Nitrogenase activity in several diazotrophs is switched off by ammonium and reactivated after consumption. The signaling pathway to this system in Azospirillum brasilense is not understood. We show that ammonium-dependent switch-off through ADP-ribosylation of Fe protein was partial in a glnB mutant of A. brasilense but absent in a glnB glnZ double mutant. Triggering of inactivation by anaerobic conditions was not affected in either mutant. The results suggest that glnB is necessary for full ammonium-dependent nitrogenase switch-off in A. brasilense.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Bactérias
/
Transdução de Sinais
/
Azospirillum brasilense
/
Regulação Bacteriana da Expressão Gênica
/
Compostos de Amônio Quaternário
/
Nitrogenase
País/Região como assunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Appl Environ Microbiol
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Brasil