AddB

• Description: ATP-dependent deoxyribonuclease (subunit B), required for efficient survival and replication restart after replication-transcription conflicts
  
  

Gene name	addB
Synonyms
Essential	no
Product	ATP-dependent deoxyribonuclease (subunit B))
Function	DNA repair/ recombination
Gene expression levels in SubtiExpress: addB
Interactions involving this protein in SubtInteract: AddB
MW, pI	134 kDa, 5.39
Gene length, protein length	3498 bp, 1166 aa
Immediate neighbours	yhjR, addA
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 repair/ recombination, genetic competence

This gene is a member of the following regulons

ComK regulon

The gene

Basic information

• Locus tag: BSU10620

Phenotypes of a mutant

• recO addA-addB double mutants are extremely sensitive against DNA damaging agents PubMed

Database entries

• BsubCyc: BSU10620

• 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:

• Cofactors:

• Effectors of protein activity:

• Interactions:
  • AddA-AddB PubMed

• Localization:

Database entries

• BsubCyc: BSU10620

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

• UniProt: P23477

• KEGG entry: [3]

• E.C. number:

Expression and regulation

• Operon: addB-addA-sbcD-sbcC-hlpB PubMed

• Expression browser: addB PubMed

• Sigma factor: SigA PubMed

• Regulation:
  • positive control by ComK PubMed

• Regulatory mechanism:

• Additional information:

Biological materials

• Mutant: GP1106 (addA-addB, spc), available in Jörg Stülke's lab

• Expression vector:

• lacZ fusion:

• GFP fusion:

• two-hybrid system:

• Antibody:

Labs working on this gene/protein

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