Regulation of nitrogen fixation in Azospirillum brasilense Sp7: involvement of nifA, glnA and glnB gene products.
The expression of nifA-, niH- and nifB-lacZ fusions was examined in different mutants of Azospirillum brasilense. Mutations in nifA, glnA and glnB severely impaired the expression of nifH- and nifB-lacZ fusions. By contrast, a nifA-lacZ fusion was not affected in a nifA or a glnB background and was only partially impaired in glnA mutants. It is proposed that in A. brasilense, the PII protein and glutamine synthetase are involved in a post-translational modification of NifA.
Département des Biotechnologies, Institut Pasteur, Paris, France.
Y Y
YY
Liang
M
M
de Zamaroczy
F
F
Arsène
A
A
Paquelin
C
C
Elmerich
D000595:Amino Acid Sequence; D015806:Azospirillum brasilense / Q000235:genetics* / Q000378:metabolism*; D001483:Base Sequence; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000235:genetics; D015870:Gene Expression; D005798:Genes, Bacterial; D005974:Glutamate-Ammonia Ligase / Q000235:genetics / Q000378:metabolism; D007763:Lac Operon; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D009586:Nitrogen Fixation / Q000235:genetics
D004269:DNA, Bacterial; D005974:Glutamate-Ammonia Ligase