CarB

• Description: carbamoyl-phosphate transferase-arginine subunit B)
  
  

Gene name	carB
Synonyms	cpa
Essential	no
Product	carbamoyl-phosphate transferase-arginine subunit B)
Function	biosynthesis of arginine
Metabolic function and regulation of this protein in SubtiPathways: Pyrimidines, Ammonium/ glutamate
MW, pI	112 kDa, 4.712
Gene length, protein length	3090 bp, 1030 aa
Immediate neighbours	carA, argF
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList

Categories containing this gene/protein

biosynthesis/ acquisition of amino acids

This gene is a member of the following regulons

AhrC regulon

The gene

Basic information

• Locus tag: BSU11240

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: 2 ATP + L-glutamine + HCO₃^- + H₂O = 2 ADP + phosphate + L-glutamate + carbamoyl phosphate (according to Swiss-Prot)

• Protein family: carB family (according to Swiss-Prot)

• Paralogous protein(s): PyrAB

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity:

• Interactions: CarA-CarB

• Localization:

Database entries

• Structure: 1JDB (from Escherichia coli, 47% identity, 64% similarity) PubMed

• UniProt: P18185

• KEGG entry: [3]

• E.C. number: 6.3.5.5

Additional information

• subject to Clp-dependent proteolysis upon glucose starvation PubMed

Expression and regulation

• Operon: argC-argJ-argB-argD-carA-carB-argF PubMed

• Sigma factor: SigA PubMed

• Regulation:
  • repressed by casamino acids PubMed
  • repressed by arginine (AhrC) PubMed

• Regulatory mechanism:
  • AhrC: transcription repression PubMed

• Additional information: subject to Clp-dependent proteolysis upon glucose starvation PubMed

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

References

Ulrike Mäder, Georg Homuth, Christian Scharf, Knut Büttner, Rüdiger Bode, Michael Hecker
Transcriptome and proteome analysis of Bacillus subtilis gene expression modulated by amino acid availability.
J Bacteriol: 2002, 184(15);4288-95
[PubMed:12107147] [WorldCat.org] [DOI] (P p)

A Mountain, N H Mann, R N Munton, S Baumberg
Cloning of a Bacillus subtilis restriction fragment complementing auxotrophic mutants of eight Escherichia coli genes of arginine biosynthesis.
Mol Gen Genet: 1984, 197(1);82-9
[PubMed:6096675] [WorldCat.org] [DOI] (P p)