A0A379JKI9 · A0A379JKI9_9NOCA

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.

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 site308-315ATP (UniProtKB | ChEBI)
Binding site1146Mg2+ (UniProtKB | ChEBI)
Binding site1272Mg2+ (UniProtKB | ChEBI)
Active site1286For nuclease activity
Binding site1286Mg2+ (UniProtKB | ChEBI)

GO annotations

AspectTerm
Cellular Componentcytosol
Cellular Componentexodeoxyribonuclease V complex
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
      NCTC1934_06228

Organism names

  • Taxonomic identifier
  • Strain
    • NCTC1934
  • Taxonomic lineage
    Bacteria > Actinomycetota > Actinomycetes > Mycobacteriales > Nocardiaceae > Nocardia

Accessions

  • Primary accession
    A0A379JKI9

Proteomes

Subcellular Location

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 compositional bias, region, domain.

TypeIDPosition(s)Description
Compositional bias1-16Polar residues
Region1-296Disordered
Region1-1053DNA-binding and helicase activity, interacts with RecC
Domain287-616UvrD-like helicase ATP-binding
Domain627-912UvrD-like helicase C-terminal
Region1080-1392Nuclease activity, interacts with RecD and RecA
Region1092-1113Disordered

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.

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    1,392
  • Mass (Da)
    148,634
  • Last updated
    2018-11-07 v1
  • Checksum
    AF44B6EEBD45D54E
MSDELFSLTDTAADPPTPTRRRSRPPRDPEPANTDTAVDVLALPLDDLPRGAGAERAAGAADSAGPARAALSDPESDRHDTVPESGSVAAETSPGGRTEHAVDRHGSGAVAPGDQPDQPARTEQGANRRSRRSGHRGPGDAVLPAENGSSRASVDPDTEDAYPDRSAAPQGRPRPVADIGRDTPNVGAAGANSSARSDPSGAGGGEIPAATVDSGPEIVAEDTGSRSRREPVAPSAAPQRRTGGPRERDAAPESRSAVPPMLTPQRGPRYDTTGEGGTPDRAPGPQGRAESRFDLRGPLPAGTMVLEASAGTGKTYAIVGLAVRYVAEAGVDISQLLLVTFSRAATQELRERTRNRFVEVATGLADPEAARESRDELVSLLAQADSAEVALRRERLLAALSDFDAGSIATTHSFCQRMLDELGLAGERDPGARLVESIEDVVATVADDLYVSRYARDGAPFSPSEAHELAVSAVGDRQSMLVPQAEYDGDPAAERVAFAEAVRTEVARRKQLSGIRDFDDLLVLLHRVLADTEHGERACRRIRDRFQVALVDEFQDTDPLQWDILRRAFHGHATLVLVGDPKQAIYAFRGAEVLSYLTAVSVADNRRELTVNWRSDAGLLQALAHVQSGAALGHQEIRVHPVAATRPWTRLSGPAEAITPLRLRCFPRSGAGPLNKSGFPTVGRQRERVATDVAADIVRLLESGVTITTSAGERPVDAGDIAVLVRTHTQLNLVRAALEKAGVPSVLTGGASVFGTESAMDWLWVLRALEQPHRADRVRLAAGTALFGLSAVEIDSGGADLVGQLSAQLRDSARLFTRAGFAAVFERLSAERELAPRLLALDGGERQLTDLRQLAQLLDEAALRESLGLTALARWLADRVRDPASGAVTGRSRRLDRDARSVQIATVHASKGLEFPVVYLPFAWDSMMLPKNAALLFHDERDRRVLDVGGPDAPGHAQRKRCAEAEAAGEELRLLYVALTRAGAQVVAWWAPSYNTATGPLHRMLFGREPGGDEVADKVAVPADHVALDRITTWAAAAGDGVITVEPVDRARAARLVAATTDGAVGELAAARFDRVLDHDWRRTSYSALTAGAHDHAPTTDTPDGRGIADEPDAPSVLADAAVPATAAPSLMNDLPYGAEFGTLVHEVLEYVDTDAPDLAAEIRDRTAHAVAEQMFDADPEVLSRALLAVMRTPIGFGCLADIPTRDRLSELDFELPLAGGDTPARERVTVPHIATLLRRHLPPGDPLADYADQLADLDDTPLRGYLTGSIDAVLRIPGPRFVVVDYKTNRLGTGGLTVAHYTHEQMAAEMMRSHYPLQAILYSVALHRYLRWRLPDYAPERHLGGIRYLFVRGMIGPDTPDGAGVFDWEPPAALVVELSALLAGETGGGRA

Features

Showing features for compositional bias.

TypeIDPosition(s)Description
Compositional bias1-16Polar residues

Keywords

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
UGRY01000005
EMBL· GenBank· DDBJ
SUD48884.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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