AddA

Gene name	addA
Synonyms	recE5
Essential	no
Product	ATP-dependent deoxyribonuclease (subunit A))
Function	DNA repair/ recombination
Gene expression levels in SubtiExpress: addA
Interactions involving this protein in SubtInteract: AddA
MW, pI	140 kDa, 5.127
Gene length, protein length	3696 bp, 1232 aa
Immediate neighbours	addB, sbcD
Get the DNA and protein sequences (Barbe et al., 2009)
Genetic context This image was kindly provided by SubtiList
Expression at a glance   PubMed

Categories containing this gene/protein

DNA repair/ recombination, genetic competence

This gene is a member of the following regulons

ComK regulon

The gene

Basic information

• Locus tag: BSU10630

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

Additional information

• A mutation was found in this gene after evolution under relaxed selection for sporulation PubMed

The protein

Basic information/ Evolution

• Catalyzed reaction/ biological activity:
  • the enzyme is functional as a heterodimer of the AddA and AddB subunits, that it is a rapid and processive DNA helicase, and that it catalyses DNA unwinding using one single-stranded DNA motor of 3'→5' polarity located in the AddA subunit PubMed
  • the AddB subunit contains a second putative ATP-binding pocket, but this does not contribute to the observed helicase activity and may instead be involved in the recognition of recombination hotspot sequences PubMed

• Protein family: uvrD-like helicase C-terminal domain (according to Swiss-Prot)

• Paralogous protein(s):

Extended information on the protein

• Kinetic information:

• Domains:

• Modification:

• Cofactor(s):

• Effectors of protein activity:

• Interactions:
  • AddA-AddB PubMed

• Localization:

Database entries

• Structure: 3U4Q (the AddA-AddB-DNA complex) PubMed

• UniProt: P23478

• KEGG entry: [3]

• E.C. number:

Expression and regulation

• Operon: addB-addA PubMed

• Expression browser: addA PubMed

• Sigma factor: SigA PubMed

• Regulation:
  • positive control by ComK PubMed

• Regulatory mechanism:

• Additional information:

Biological materials

• Mutant: GP1106 (addAB, spc), available in Stülke lab

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

Labs working on this gene/protein

• Mark Dillingham, Bristol, U.K. (homepage)

References

Original publications

Additional publications: PubMed

Kayarat Saikrishnan, Joseph T Yeeles, Neville S Gilhooly, Wojciech W Krajewski, Mark S Dillingham, Dale B Wigley
Insights into Chi recognition from the structure of an AddAB-type helicase-nuclease complex.
EMBO J: 2012, 31(6);1568-78
[PubMed:22307084] [WorldCat.org] [DOI] (I p)

Christopher T Brown, Laura K Fishwick, Binna M Chokshi, Marissa A Cuff, Jay M Jackson, Travis Oglesby, Alison T Rioux, Enrique Rodriguez, Gregory S Stupp, Austin H Trupp, James S Woollcombe-Clarke, Tracy N Wright, William J Zaragoza, Jennifer C Drew, Eric W Triplett, Wayne L Nicholson
Whole-genome sequencing and phenotypic analysis of Bacillus subtilis mutants following evolution under conditions of relaxed selection for sporulation.
Appl Environ Microbiol: 2011, 77(19);6867-77
[PubMed:21821766] [WorldCat.org] [DOI] (I p)

Natalia Fili, Christopher P Toseland, Mark S Dillingham, Martin R Webb, Justin E Molloy
A single-molecule approach to visualize the unwinding activity of DNA helicases.
Methods Mol Biol: 2011, 778;193-214
[PubMed:21809208] [WorldCat.org] [DOI] (I p)

Natali Fili, Gregory I Mashanov, Christopher P Toseland, Christopher Batters, Mark I Wallace, Joseph T P Yeeles, Mark S Dillingham, Martin R Webb, Justin E Molloy
Visualizing helicases unwinding DNA at the single molecule level.
Nucleic Acids Res: 2010, 38(13);4448-57
[PubMed:20350930] [WorldCat.org] [DOI] (I p)

Joseph T P Yeeles, Richard Cammack, Mark S Dillingham
An iron-sulfur cluster is essential for the binding of broken DNA by AddAB-type helicase-nucleases.
J Biol Chem: 2009, 284(12);7746-55
[PubMed:19129187] [WorldCat.org] [DOI] (P p)

Joseph T P Yeeles, Mark S Dillingham
A dual-nuclease mechanism for DNA break processing by AddAB-type helicase-nucleases.
J Mol Biol: 2007, 371(1);66-78
[PubMed:17570399] [WorldCat.org] [DOI] (P p)

Frédéric Chédin, Naofumi Handa, Mark S Dillingham, Stephen C Kowalczykowski
The AddAB helicase/nuclease forms a stable complex with its cognate chi sequence during translocation.
J Biol Chem: 2006, 281(27);18610-7
[PubMed:16632468] [WorldCat.org] [DOI] (P p)

Alexander Serganov, Yu-Ren Yuan, Olga Pikovskaya, Anna Polonskaia, Lucy Malinina, Anh Tuân Phan, Claudia Hobartner, Ronald Micura, Ronald R Breaker, Dinshaw J Patel
Structural basis for discriminative regulation of gene expression by adenine- and guanine-sensing mRNAs.
Chem Biol: 2004, 11(12);1729-41
[PubMed:15610857] [WorldCat.org] [DOI] (P p)

Etienne Dervyn, Marie-Françoise Noirot-Gros, Peggy Mervelet, Steven McGovern, S Dusko Ehrlich, Patrice Polard, Philippe Noirot
The bacterial condensin/cohesin-like protein complex acts in DNA repair and regulation of gene expression.
Mol Microbiol: 2004, 51(6);1629-40
[PubMed:15009890] [WorldCat.org] [DOI] (P p)

F Chédin, S D Ehrlich, S C Kowalczykowski
The Bacillus subtilis AddAB helicase/nuclease is regulated by its cognate Chi sequence in vitro.
J Mol Biol: 2000, 298(1);7-20
[PubMed:10756102] [WorldCat.org] [DOI] (P p)

F Chédin, P Noirot, V Biaudet, S D Ehrlich
A five-nucleotide sequence protects DNA from exonucleolytic degradation by AddAB, the RecBCD analogue of Bacillus subtilis.
Mol Microbiol: 1998, 29(6);1369-77
[PubMed:9781875] [WorldCat.org] [DOI] (P p)

B J Haijema, L W Hamoen, J Kooistra, G Venema, D van Sinderen
Expression of the ATP-dependent deoxyribonuclease of Bacillus subtilis is under competence-mediated control.
Mol Microbiol: 1995, 15(2);203-11
[PubMed:7746142] [WorldCat.org] [DOI] (P p)

J Kooistra, B J Haijema, G Venema
The Bacillus subtilis addAB genes are fully functional in Escherichia coli.
Mol Microbiol: 1993, 7(6);915-23
[PubMed:8387145] [WorldCat.org] [DOI] (P p)