Obg

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  • Description: GTP-binding protein involved in initiation of sporulation

Gene name obg
Synonyms
Essential Yes
Product GTP-binding protein
Function may be required to stimulate activity of the phosphorelay that activates Spo0A
MW, pI 47 kDa, 4.859
Gene length, protein length 1284 bp, 428 aa
Immediate neighbours spo0B, pheB
Gene sequence (+200bp) Protein sequence
Genetic context
Obg context.gif



The gene

Basic information

  • Coordinates:

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:

Binds and hydrolyzes GTP and readily exchanges GDP for GTP

  • Protein family:Era/Obg family
  • Paralogous protein(s):

Extended information on the protein

  • Kinetic information:
  • Domains:

Obg possesses 3 domains: A N-terminal glycine-rich domain (1–158), a GTP binding domain (159–342) and a C-terminal TGS domain (343–428). The TGS domain has no known function, but it is named for three protein families in which it is found, ThrRS, GTPase, and SpoT.

  • Modification:
  • Cofactor(s):

GDP, GTP and probably ppGpp

  • Effectors of protein activity:
  • Interactions:

Interaction with Rsb proteins.

  • Localization:

Database entries

  • Swiss prot entry:[3]
  • KEGG entry:[4]
  • E.C. number:

Additional information

The biochemical analysis of bacterial and human Obg proteins combined with the structural observation of the ppGpp nucleotide within the Obg active site suggest a potential role for ppGpp modulation of Obg function in B. subtilis.

Expression and regulation

  • Regulation:
  • Regulatory mechanism:
  • Additional information:

Biological materials

  • Mutant:
  • Expression vector:
  • lacZ fusion:
  • GFP fusion:
  • two-hybrid system:
  • Antibody:

Labs working on this gene/protein

Your additional remarks

References

  1. Buglino J., Shen V., Hakiman P. & Lima C.D. (2002) Structural and biochemical analysis of the Obg GTP binding protein Structure 10: 1581-1592. PubMed
  2. Scott, J.M., Ju, J., Mitchell, T., and Haldenwang, W.G. (2000) The Bacillus subtilis GTP binding protein obg and regulators of the sigma(B) stress response transcription factor cofractionate with ribosomes J. Bacteriol. 182: 2771–2777. PubMed