DnaX

• 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 This image was kindly provided by SubtiList
Expression at a glance   PubMed

Categories containing this gene/protein

DNA replication, essential genes

The gene

Basic information

• Locus tag: BSU00190

Phenotypes of a mutant

essential PubMed

Database entries

• DBTBS entry: no entry

• SubtiList entry: [1]

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:

• Interactions:
  • DnaX-DnaB PubMed
  • DnaX-DnaC PubMed
  • DnaX(3)-HolA-HolB, the clamp-loader complex PubMed
  • part of the replisome: PolC-HolA-HolB-DnaX-DnaN-DnaG-DnaC-DnaI-DnaD-SsbA-DnaE-PriA-DnaB PubMed

• Localization:
  • forms foci PubMed
  • Nucleoid (Mid-cell) PubMed

Database entries

• Structure:

• UniProt: P09122

• KEGG entry: [2]

• E.C. number: 2.7.7.7

Expression and regulation

• Operon:

• Expression browser: dnaX PubMed

• Sigma factor:

• Regulation:

• Regulatory mechanism:

• Additional information:

Biological materials

• Mutant:

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

References

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] [WorldCat.org] [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] [WorldCat.org] [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] [WorldCat.org] [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] [WorldCat.org] [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] [WorldCat.org] [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] [WorldCat.org] [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] [WorldCat.org] [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] [WorldCat.org] [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] [WorldCat.org] [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] [WorldCat.org] [DOI] (P p)