DnaN

• Description: DNA polymerase III (beta subunit), beta clamp, part of the replisome, also involved in DNA mismatch repair
  
  

Gene name	dnaN
Synonyms	dnaG, dnaK
Essential	yes PubMed
Product	DNA polymerase III (beta subunit), beta clamp
Function	DNA replication, DNA repair
MW, pI	41 kDa, 4.718
Gene length, protein length	1134 bp, 378 aa
Immediate neighbours	dnaA, yaaA
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: BSU00020

Phenotypes of a mutant

essential PubMed

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity: Deoxynucleoside triphosphate + DNA(n) = diphosphate + DNA(n+1) (according to Swiss-Prot)

• Protein family:

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity:

• Interactions:
  • DnaA-YabA-DnaN PubMed
  • part of the replisome: PolC-HolA-HolB-DnaX-DnaN-DnaG-DnaC-DnaI-DnaD-SsbA-DnaE-PriA-DnaB PubMed
  • PolY1-DnaN, PolY2-DnaN (required for untargeted mutagenesis) PubMed
  • PolY1-PolA-DnaN PubMed
  • DnaN forms dimers PubMed

• Localization: cytoplasm (according to Swiss-Prot), nucleoid (mid-cell spot) PubMed PubMed

Database entries

• Structure:

• UniProt: P05649

• KEGG entry: [3]

• E.C. number: 2.7.7.7

Expression and regulation

• Operon: dnaA-dnaN PubMed

• Sigma factor: SigA PubMed

• Regulation: negatively controlled by DnaA PubMed and Spo0A PubMed
  • repressed under conditions that trigger sporulation (Spo0A) PubMed

• Regulatory mechanism:
  • Spo0A: transcription repression PubMed

• Additional information:

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion: PubMed PubMed

• two-hybrid system:

• Antibody:

Labs working on this gene/protein

Philippe Noirot, Jouy-en-Josas, France homepage

References

Reviews

Tsutomu Katayama, Shogo Ozaki, Kenji Keyamura, Kazuyuki Fujimitsu
Regulation of the replication cycle: conserved and diverse regulatory systems for DnaA and oriC.
Nat Rev Microbiol: 2010, 8(3);163-70
[PubMed:20157337] [WorldCat.org] [DOI] (I p)