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  • Description: DNA polymerase III (gamma and tau subunits) part of the clamp-loader complex and the replisome

Gene name dnaX
Synonyms dnaH, dna-8132
Essential yes PubMed
Product DNA polymerase III (gamma and tau subunits)
Function DNA replication
Gene expression levels in SubtiExpress: dnaX
Interactions involving this protein in SubtInteract: DnaX
MW, pI 62 kDa, 5.488
Gene length, protein length 1689 bp, 563 aa
Immediate neighbours scr, yaaK
Sequences Protein DNA DNA_with_flanks
Genetic context
DnaX context.gif
This image was kindly provided by SubtiList
Expression at a glance   PubMed
DnaX expression.png

Categories containing this gene/protein

DNA replication, essential genes

This gene is a member of the following regulons

The gene

Basic information

  • Locus tag: BSU00190

Phenotypes of a mutant

essential PubMed

Database entries

  • DBTBS entry: no entry
  • SubtiList entry: [1]

Additional information

The protein

Basic information/ Evolution

  • Catalyzed reaction/ biological activity:
    • Deoxynucleoside triphosphate + DNA(n) = diphosphate + DNA(n+1) (according to Swiss-Prot)
    • required for bacteriophage SPP1 replication PubMed
  • Protein family:
  • Paralogous protein(s):

Extended information on the protein

  • Kinetic information:
  • Domains:
  • Modification:
  • Cofactor(s):
  • Effectors of protein activity:

Database entries

  • Structure:
  • KEGG entry: [2]

Additional information

Expression and regulation

  • Operon:
  • 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


José P Afonso, Kiran Chintakayala, Chatrudee Suwannachart, Svetlana Sedelnikova, Kevin Giles, John B Hoyes, Panos Soultanas, John B Rafferty, Neil J Oldham
Insights into the structure and assembly of the Bacillus subtilis clamp-loader complex and its interaction with the replicative helicase.
Nucleic Acids Res: 2013, 41(9);5115-26
[PubMed:23525462] [] [DOI] (I p)

Elena M Seco, John C Zinder, Carol M Manhart, Ambra Lo Piano, Charles S McHenry, Silvia Ayora
Bacteriophage SPP1 DNA replication strategies promote viral and disable host replication in vitro.
Nucleic Acids Res: 2013, 41(3);1711-21
[PubMed:23268446] [] [DOI] (I p)

Andrew D Klocko, Jeremy W Schroeder, Brian W Walsh, Justin S Lenhart, Margery L Evans, Lyle A Simmons
Mismatch repair causes the dynamic release of an essential DNA polymerase from the replication fork.
Mol Microbiol: 2011, 82(3);648-63
[PubMed:21958350] [] [DOI] (I p)

Glenn M Sanders, H Garry Dallmann, Charles S McHenry
Reconstitution of the B. subtilis replisome with 13 proteins including two distinct replicases.
Mol Cell: 2010, 37(2);273-81
[PubMed:20122408] [] [DOI] (I p)

Kiran Chintakayala, Cristina Machón, Anna Haroniti, Marilyn A Larson, Steven H Hinrichs, Mark A Griep, Panos Soultanas
Allosteric regulation of the primase (DnaG) activity by the clamp-loader (tau) in vitro.
Mol Microbiol: 2009, 72(2);537-49
[PubMed:19415803] [] [DOI] (I p)

Jean-Christophe Meile, Ling Juan Wu, S Dusko Ehrlich, Jeff Errington, Philippe Noirot
Systematic localisation of proteins fused to the green fluorescent protein in Bacillus subtilis: identification of new proteins at the DNA replication factory.
Proteomics: 2006, 6(7);2135-46
[PubMed:16479537] [] [DOI] (P p)

Anna Haroniti, Christopher Anderson, Zara Doddridge, Laurence Gardiner, Clive J Roberts, Stephanie Allen, Panos Soultanas
The clamp-loader-helicase interaction in Bacillus. Atomic force microscopy reveals the structural organisation of the DnaB-tau complex in Bacillus.
J Mol Biol: 2004, 336(2);381-93
[PubMed:14757052] [] [DOI] (P p)

A Haroniti, R Till, M C M Smith, P Soultanas
Clamp-loader-helicase interaction in Bacillus. Leucine 381 is critical for pentamerization and helicase binding of the Bacillus tau protein.
Biochemistry: 2003, 42(37);10955-64
[PubMed:12974630] [] [DOI] (P p)

María I Martínez-Jiménez, Pablo Mesa, Juan C Alonso
Bacillus subtilis tau subunit of DNA polymerase III interacts with bacteriophage SPP1 replicative DNA helicase G40P.
Nucleic Acids Res: 2002, 30(23);5056-64
[PubMed:12466528] [] [DOI] (I p)

J C Struck, J C Alonso, H Y Toschka, V A Erdmann
The Bacillus subtilis small cytoplasmic RNA gene and 'dnaX' map near the chromosomal replication origin.
Mol Gen Genet: 1990, 222(2-3);470-2
[PubMed:1703271] [] [DOI] (P p)