R4Z6U2 · R4Z6U2_9ACTN

Function

function

A helicase/nuclease that prepares dsDNA breaks (DSB) for recombinational DNA repair. Binds to DSBs and unwinds DNA via a highly rapid and processive ATP-dependent bidirectional helicase activity. Unwinds dsDNA until it encounters a Chi (crossover hotspot instigator) sequence from the 3' direction. Cuts ssDNA a few nucleotides 3' to the Chi site. The properties and activities of the enzyme are changed at Chi. The Chi-altered holoenzyme produces a long 3'-ssDNA overhang and facilitates RecA-binding to the ssDNA for homologous DNA recombination and repair. Holoenzyme degrades any linearized DNA that is unable to undergo homologous recombination. In the holoenzyme this subunit contributes ATPase, 3'-5' helicase, exonuclease activity and loads RecA onto ssDNA.

Miscellaneous

In the RecBCD complex, RecB has a slow 3'-5' helicase, an exonuclease activity and loads RecA onto ssDNA, RecD has a fast 5'-3' helicase activity, while RecC stimulates the ATPase and processivity of the RecB helicase and contributes to recognition of the Chi site.

Caution

The sequence shown here is derived from an EMBL/GenBank/DDBJ whole genome shotgun (WGS) entry which is preliminary data.

Catalytic activity

Cofactor

Mg2+ (UniProtKB | Rhea| CHEBI:18420 )

Note: Binds 1 Mg2+ ion per subunit.

Features

Showing features for binding site, active site.

TypeIDPosition(s)Description
Binding site22-29ATP (UniProtKB | ChEBI)
Binding site906Mg2+ (UniProtKB | ChEBI)
Binding site1033Mg2+ (UniProtKB | ChEBI)
Active site1051For nuclease activity
Binding site1051Mg2+ (UniProtKB | ChEBI)

GO annotations

AspectTerm
Molecular Function3'-5' DNA helicase activity
Molecular FunctionATP binding
Molecular FunctionATP hydrolysis activity
Molecular FunctionDNA binding
Molecular Functionexodeoxyribonuclease V activity
Molecular Functionisomerase activity
Molecular Functionmagnesium ion binding
Biological Processdouble-strand break repair via homologous recombination

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    RecBCD enzyme subunit RecB
  • EC number
  • Alternative names
    • DNA 3'-5' helicase subunit RecB
    • Exonuclease V subunit RecB
      (ExoV subunit RecB
      )
    • Helicase/nuclease RecBCD subunit RecB

Gene names

    • Name
      recB
    • ORF names
      BN381_470007

Organism names

Accessions

  • Primary accession
    R4Z6U2

Proteomes

Interaction

Subunit

Heterotrimer of RecB, RecC and RecD. All subunits contribute to DNA-binding. Interacts with RecA.

Protein-protein interaction databases

Family & Domains

Features

Showing features for domain, region.

TypeIDPosition(s)Description
Domain1-345UvrD-like helicase ATP-binding
Region1-805DNA-binding and helicase activity, interacts with RecC
Domain388-648UvrD-like helicase C-terminal
Region825-1163Nuclease activity, interacts with RecD and RecA

Domain

The C-terminal domain has nuclease activity and interacts with RecD. It interacts with RecA, facilitating its loading onto ssDNA.
The N-terminal DNA-binding domain is a ssDNA-dependent ATPase and has ATP-dependent 3'-5' helicase function. This domain interacts with RecC.

Sequence similarities

Belongs to the helicase family. UvrD subfamily.

Phylogenomic databases

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    1,163
  • Mass (Da)
    125,274
  • Last updated
    2013-07-24 v1
  • Checksum
    D0DCB553F4B335EA
MTDIETFELAGPLPQSRLAIEASAGTGKTFTLSTLAARYVAEDGVPISELLVVTFTRAAAAELKDRVRARLIEFAEALDTATKPDDALLALIWSEDRQVRLERVRTAITEFDAATITTIHGFAQQVIGTLGSTVLTDPDAVLVDDTEAIGRQVATDVLVAEAVHEANPADEIPSLDDLLHSSQLALNNADSALVPGPNPDESNPRAARLRVLVDEITTEVDRRRKDAGTLSFDDLLSRLREALDDDLAGRSAREALRQRYRVALIDEFQDTDPVQWAIFDSVFGQGVRRAVVAERDGVTATTLVLVGDPKQAIYAFRGANVHTYIQAAHAPGTRLTSLGVNWRSDPAVLRATQTLLSGVTFGSDDILFQPVTAPDDHEDRTFATVDGAPIPALSVRLAIGPKVARDKKHAHLSTAANGEGAIHRELATHVRDLLETAVIPNEDQAGETRALRPDDVAVLIAANREGPVIRDALMALGIPAVIARGENVLESEASTHFHRLLAAVARPSNVRRARAAGLSWFFGWDAGDVATATDAELSAVQVQLHSWGETLSGRGVAAFVGQVWAETSVASRVLALPDGDRSMTDLDHIAELLSLSGGRQASPSTLLNTFEALSGGSDDGNPEADLAARRVESDSRAVQIMTTFVAKGLEFPVVCCTSLWSPTGAKAKDNIWWDTATKKRTIDVATKEKWGPDDERDARELLASQEAVGSHLRVLYVALTRARHHTAVWWLPTKADWRTGLARVLFARDRTGTIDPDLFTCVELDHIDVDESLARLQPLVEASNGELEVIVVDDPGDSADPWTGAATSDHVELAVATLDHRLDRERSRWSFTAITARAQDDHRSIDPFDNTAADAADADEGPTEAWPSGAADLIDYDESTSATERVEAPLPLGDIAGGAGFGTLVHEVLEIIDFTVPDLTTEIAGAVTDRLAWNPWPVDEQRLVDGLEAVVRSPLGPLFAGQALVDLAPSDRLDEMSFDLTLGEGGTRATDADIGRLLLNHLPADDPLGQWAVSLADGPFSAVLAGHLTGSIDLVARVRHNDGVERFVVSDYKTNRLATRGVTPSAAHFRPDQLPAAMAEHHYPLQALLYTVALHRYLRWRLPDYDPAEHLGGTAYLFVRGMVGPDTPTTDGDPNGVFTWRPAAKLIVSLSNLLDGSAESGAS

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
CANL01000042
EMBL· GenBank· DDBJ
CCM64802.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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