The transcriptional activator NtrC controls the expression and activity of glutamine synthetase in Herbaspirillum seropedicae

The role of the Ntr system in Herbaspirillum seropedicae was determined via ntrB and ntrC mutants. Three phenotypes were identified in these mutants: Nif −, deficiency in growth using nitrate, and low glutamine synthetase (GS) activity. All phenotypes were restored by the plasmid pKRT1 containing th...

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Bibliographic Details
Published in:FEMS microbiology letters 2000-11, Vol.192 (2), p.217-221
Main Authors: Persuhn, Darlene C, Souza, Emanuel M, Steffens, Maria Berenice R, Pedrosa, Fábio O, Yates, M.Geoffrey, Rigo, Liu U
Format: Article
Language:English
Subjects:
gln
glnA gene
glutamine synthase
Herbaspirillum seropedicae
nitric acid
Nitrogen fixation
ntr
ntrB gene
NtrB protein
ntrC gene
NtrC protein
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Summary:The role of the Ntr system in Herbaspirillum seropedicae was determined via ntrB and ntrC mutants. Three phenotypes were identified in these mutants: Nif −, deficiency in growth using nitrate, and low glutamine synthetase (GS) activity. All phenotypes were restored by the plasmid pKRT1 containing the intact glnA, ntrB and ntrC genes of H. seropedicae. The promoter region of glnA was subcloned into a β-galactosidase fusion vector and the results suggested that NtrC positively regulates the glnA promoter in response to low nitrogen. The H. seropedicae ntrC and ntrB mutant strains showed a deficiency of adenylylation/deadenylylation of GS, indicating that NtrC and NtrB are involved in both transcription and activity control of GS in this organism.
ISSN:0378-1097
1574-6968
DOI:10.1016/S0378-1097(00)00435-3