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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:
Purine synthesis, Nucleotides (regulation)
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

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:
  • Domains:
  • 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
  • Cofactor(s):
  • 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

  • Sigma factor:
  • 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


Allison Kriel, Alycia N Bittner, Sok Ho Kim, Kuanqing Liu, Ashley K Tehranchi, Winnie Y Zou, Samantha Rendon, Rui Chen, Benjamin P Tu, Jue D Wang
Direct regulation of GTP homeostasis by (p)ppGpp: a critical component of viability and stress resistance.
Mol Cell: 2012, 48(2);231-41
[PubMed:22981860] [] [DOI] (I p)

Bui Khanh Chi, Alexandra A Roberts, Tran Thi Thanh Huyen, Katrin Bäsell, Dörte Becher, Dirk Albrecht, Chris J Hamilton, Haike Antelmann
S-bacillithiolation protects conserved and essential proteins against hypochlorite stress in firmicutes bacteria.
Antioxid Redox Signal: 2013, 18(11);1273-95
[PubMed:22938038] [] [DOI] (I p)

Christine Eymann, Dörte Becher, Jörg Bernhardt, Katrin Gronau, Anja Klutzny, Michael Hecker
Dynamics of protein phosphorylation on Ser/Thr/Tyr in Bacillus subtilis.
Proteomics: 2007, 7(19);3509-26
[PubMed:17726680] [] [DOI] (P p)

Falko Hochgräfe, Jörg Mostertz, Dierk-Christoph Pöther, Dörte Becher, John D Helmann, Michael Hecker
S-cysteinylation is a general mechanism for thiol protection of Bacillus subtilis proteins after oxidative stress.
J Biol Chem: 2007, 282(36);25981-5
[PubMed:17611193] [] [DOI] (P p)

G Hambraeus, C von Wachenfeldt, L Hederstedt
Genome-wide survey of mRNA half-lives in Bacillus subtilis identifies extremely stable mRNAs.
Mol Genet Genomics: 2003, 269(5);706-14
[PubMed:12884008] [] [DOI] (P p)

Virginie Molle, Yoshiko Nakaura, Robert P Shivers, Hirotake Yamaguchi, Richard Losick, Yasutaro Fujita, Abraham L Sonenshein
Additional targets of the Bacillus subtilis global regulator CodY identified by chromatin immunoprecipitation and genome-wide transcript analysis.
J Bacteriol: 2003, 185(6);1911-22
[PubMed:12618455] [] [DOI] (P p)

H H Saxild, P Nygaard
Regulation of levels of purine biosynthetic enzymes in Bacillus subtilis: effects of changing purine nucleotide pools.
J Gen Microbiol: 1991, 137(10);2387-94
[PubMed:1722815] [] [DOI] (P p)

J M Lopez, A Dromerick, E Freese
Response of guanosine 5'-triphosphate concentration to nutritional changes and its significance for Bacillus subtilis sporulation.
J Bacteriol: 1981, 146(2);605-13
[PubMed:6111556] [] [DOI] (P p)