Recent developments in the structural organization and regulation of nitrogen fixation genes in Herbaspirillum seropedicae.
Herbaspirillum seropedicae is a nitrogen-fixing bacterium found in association with economically important gramineae. Regulation of nitrogen fixation involves the transcriptional activator NifA protein. The regulation of NifA protein and its truncated mutant proteins is described and compared with that of other nitrogen fixation bacteria. Nitrogen fixation control in H. seropedicae, of the beta-subgroup of Proteobacteria, has regulatory features in common with Klebsiella pneumoniae, of the gamma-subgroup, at the level of nifA expression and with rhizobia and Azospirillum brasilense, of the alpha-subgroup, at the level of control of NifA by oxygen.
Pedrosa
F O
FO
Department of Biochemistry, Universidade Federal do Paraná, C. Postal 19046, CEP 81531-990 PR, Curitiba, Brazil. fpedrosa@bio.ufpr.br
Benelli
E M
EM
Yates
M G
MG
Wassem
R
R
Monteiro
R A
RA
Klassen
G
G
Steffens
M B
MB
Souza
E M
EM
Chubatsu
L S
LS
Rigo
L U
LU
D001426:Bacterial Proteins / Q000235:genetics; D020562:Betaproteobacteria / Q000235:genetics*; D002352:Carrier Proteins / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D023061:Gene Order; D005798:Genes, Bacterial; D009586:Nitrogen Fixation / Q000235:genetics*; D051922:PII Nitrogen Regulatory Proteins; D014157:Transcription Factors / Q000235:genetics
D001426:Bacterial Proteins; D002352:Carrier Proteins; C113488:GlnK protein, Azorhizobium caulinodans; C061338:NifA protein, Bacteria; D051922:PII Nitrogen Regulatory Proteins; D014157:Transcription Factors; C404143:PIID regulatory protein, Bacteria