6SJE

Cryo-EM structure of the RecBCD Chi partially-recognised complex

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.1 of the entry. See complete history. 


Literature

A conformational switch in response to Chi converts RecBCD from phage destruction to DNA repair.

Cheng, K., Wilkinson, M., Chaban, Y., Wigley, D.B.

(2020) Nat Struct Mol Biol 27: 71-77

  • DOI: 10.1038/s41594-019-0355-2
  • Primary Citation of Related Structures:  
    6SJF, 6SJE, 6SJG, 6SJB, 6T2U, 6T2V

  • PubMed Abstract: 

    • The RecBCD complex plays key roles in phage DNA degradation, CRISPR array acquisition (adaptation) and host DNA repair. The switch between these roles is regulated by a DNA sequence called Chi. We report cryo-EM structures of the Escherichia coli RecBCD complex bound to several different DNA forks containing a Chi sequence, including one in which Chi is recognized and others in which it is not ...

    The RecBCD complex plays key roles in phage DNA degradation, CRISPR array acquisition (adaptation) and host DNA repair. The switch between these roles is regulated by a DNA sequence called Chi. We report cryo-EM structures of the Escherichia coli RecBCD complex bound to several different DNA forks containing a Chi sequence, including one in which Chi is recognized and others in which it is not. The Chi-recognized structure shows conformational changes in regions of the protein that contact Chi and reveals a tortuous path taken by the DNA. Sequence specificity arises from interactions with both the RecC subunit and the sequence itself. These structures provide molecular details for how Chi is recognized and insights into the changes that occur in response to Chi binding that switch RecBCD from bacteriophage destruction and CRISPR spacer acquisition to constructive host DNA repair.

    Organizational Affiliation: 

    Section of Structural Biology, Department of Infectious Disease, Faculty of Medicine, Imperial College London, London, UK. D.Wigley@imperial.ac.uk.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RecBCD enzyme subunit RecB B1181Escherichia coliMutation(s): 1 
Gene Names: recB, ior, rorA, b2820, JW2788
EC: 3.1.11.5
Find proteins for P08394 (Escherichia coli (strain K12))
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Go to UniProtKB:  P08394
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
RecBCD enzyme subunit RecC C1122Escherichia coliMutation(s): 0 
Gene Names: recC, b2822, JW2790
EC: 3.1.11.5
Find proteins for P07648 (Escherichia coli (strain K12))
Explore P07648 
Go to UniProtKB:  P07648
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
RecBCD enzyme subunit RecD D608Escherichia coliMutation(s): 0 
Gene Names: recD, hopE, b2819, JW2787
EC: 3.1.11.5
Find proteins for P04993 (Escherichia coli (strain K12))
Explore P04993 
Go to UniProtKB:  P04993
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsLengthOrganismImage
DNA fork substrateX85synthetic construct
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-01
    Type: Initial release
  • Version 1.1: 2020-01-22
    Changes: Database references