GuaB

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  • Description: IMP dehydrogenase

Gene name guaB
Synonyms guaA
Essential yes PubMed
Product IMP dehydrogenase
Function biosynthesis of GMP
Gene expression levels in SubtiExpress: GuaB
Metabolic function and regulation of this protein in SubtiPathways:
guaB
MW, pI 52 kDa, 6.168
Gene length, protein length 1464 bp, 488 aa
Immediate neighbours yaaC, dacA
Sequences Protein DNA DNA_with_flanks
Genetic context
GuaB context.gif
This image was kindly provided by SubtiList
Expression at a glance   PubMed
GuaB expression.png















Categories containing this gene/protein

biosynthesis/ acquisition of nucleotides, essential genes, phosphoproteins

This gene is a member of the following regulons

CodY regulon

The gene

Basic information

  • Locus tag: BSU00090

Phenotypes of a mutant

  • essential PubMed
  • reduced expression of guaB suppresses the requirement of a relA yjbM ywaC triple mutant for branched chain amino acids, methionine and threonine PubMed

Database entries

  • DBTBS entry: [1]
  • SubtiList entry: [2]

Additional information

The protein

Basic information/ Evolution

  • Catalyzed reaction/ biological activity: Inosine 5'-phosphate + NAD+ + H2O = xanthosine 5'-phosphate + NADH (according to Swiss-Prot)
  • Protein family: IMPDH/GMPR family (according to Swiss-Prot)
  • Paralogous protein(s):

Extended information on the protein

  • Kinetic information:
  • Modification:
    • phosphorylated (STY) PubMed
    • Cys308 is S-cysteinylated after diamide stress PubMed, PubMed
    • Cys308 is S-bacillithiolated by NaOCl stress in B. subtilis and other Bacillus species PubMed
  • Effectors of protein activity:
    • inhibition of enzymatic activity by (p)ppGpp during the ´stringent response´PubMed

Database entries

  • Structure: 1VRD (from Thermotoga maritima msb8, 60% identity, 80% similarity)
  • KEGG entry: [3]

Additional information

Expression and regulation

  • Regulation:
    • activated during growth in the presence of branched chain amino acids (CodY) PubMed
  • Regulatory mechanism:
  • Additional information:
    • the mRNA is very stable (half-life > 15 min) PubMed
    • inhibition of enzymatic activity by (p)ppGpp during the ´stringent response´PubMed

Biological materials

  • Mutant:
  • Expression vector:
    • purification from B. subtilis with an N-terminal Strep-tag, for SPINE, (in pGP380): pGP901, available in Stülke lab
  • lacZ fusion:
  • GFP fusion:
  • two-hybrid system:
  • Antibody:

Labs working on this gene/protein

Your additional remarks

References