TnrA

• Description: transcriptional pleiotropic regulator invoved in global nitrogen regulation
  
  

Gene name	tnrA
Synonyms	scgR
Essential	no
Product	transcription activator/ repressor
Function	regulation of nitrogen assimilation (positive regulation of nrgAB, nasBCDEF, gabP, ureABC, guaD; negative regulation of glnRA, gltAB)
Metabolic function and regulation of this protein in SubtiPathways: Nucleotides (regulation), Ile, Leu, Val, Ammonium/ glutamate, Central C-metabolism, Cell wall, Coenzyme A
MW, pI	12 kDa, 10.235
Gene length, protein length	330 bp, 110 aa
Immediate neighbours	mgtE, ykzB
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList

The gene

Basic information

• Locus tag: BSU13310

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity:

• Protein family:

• Paralogous protein(s):

Genes/ operons controlled by TnrA

• Activation by TnrA: nrgA-nrgB

• Repression by TnrA: degS-degU, gltA-gltB

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity: feedback-inhibited GlnA prevents TnrA from DNA binding

• Interactions: TnrA-GlnA, TnrA-NrgB PubMed, TnrA-GlnA, this interaction results in loss of TnrA DNA-binding activity

• Localization:

Database entries

• Structure:

• UniProt: Q45666

• KEGG entry: [3]

• E.C. number:

Expression and regulation

• Operon: tnrA (according to DBTBS)

• Sigma factor:

• Regulation:
  • expression is autocativated (TnrA) and repressed by GlnR PubMed
  • expressed in the absence of good nitrogen sources (glutamine or ammonium) (TnrA) PubMed

• Regulatory mechanism:
  • TnrA: transcription activation PubMed

• Additional information:

Biological materials

• Mutant: GP252 (in frame deletion), available in the Stülke lab

• Expression vector:
  • for expression, purification in E. coli with N-terminal His-tag, in pWH844: pGP171 available in Stülke lab

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody: available in the Karl Forchhammer lab

Labs working on this gene/protein

Susan Fisher, Boston, USA homepage