AddA

• Description: ATP-dependent deoxyribonuclease (subunit A)
  
  

Gene name	addA
Synonyms	recE5
Essential	no
Product	ATP-dependent deoxyribonuclease (subunit A))
Function	DNA repair and recombination
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

The gene

Basic information

• Locus tag: BSU10630

Database entries

• DBTBS entry: [1]

• SubtiList entry: [2]

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:

• UniProt: P23478

• KEGG entry: [3]

• E.C. number:

Expression and regulation

• Operon: addB-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:

References

Original publications

Joseph T P Yeeles, Emma J Gwynn, Martin R Webb, Mark S Dillingham
The AddAB helicase-nuclease catalyses rapid and processive DNA unwinding using a single Superfamily 1A motor domain.
Nucleic Acids Res: 2011, 39(6);2271-85
[PubMed:21071401] [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)