5MBV

Cryo-EM structure of Lambda Phage protein GamS bound to RecBCD.


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural basis for the inhibition of RecBCD by Gam and its synergistic antibacterial effect with quinolones.

Wilkinson, M.Troman, L.Wan Nur Ismah, W.A.Chaban, Y.Avison, M.B.Dillingham, M.S.Wigley, D.B.

(2016) Elife 5

  • DOI: 10.7554/eLife.22963
  • Primary Citation of Related Structures:  
    5MBV

  • PubMed Abstract: 
  • Our previous paper (Wilkinson et al , 2016) used high-resolution cryo-electron microscopy to solve the structure of the Escherichia coli RecBCD complex, which acts in both the repair of double-stranded DNA breaks and the degradation of bacteriophage DNA ...

    Our previous paper (Wilkinson et al , 2016) used high-resolution cryo-electron microscopy to solve the structure of the Escherichia coli RecBCD complex, which acts in both the repair of double-stranded DNA breaks and the degradation of bacteriophage DNA. To counteract the latter activity, bacteriophage λ encodes a small protein inhibitor called Gam that binds to RecBCD and inactivates the complex. Here, we show that Gam inhibits RecBCD by competing at the DNA-binding site. The interaction surface is extensive and involves molecular mimicry of the DNA substrate. We also show that expression of Gam in E. coli or Klebsiella pneumoniae increases sensitivity to fluoroquinolones; antibacterials that kill cells by inhibiting topoisomerases and inducing double-stranded DNA breaks. Furthermore, fluoroquinolone-resistance in K. pneumoniae clinical isolates is reversed by expression of Gam. Together, our data explain the synthetic lethality observed between topoisomerase-induced DNA breaks and the RecBCD gene products, suggesting a new co-antibacterial strategy.


    Organizational Affiliation

    Department of Medicine, Section of Structural Biology, Imperial College London, London, United Kingdom.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RecBCD enzyme subunit RecB B1181Escherichia coliMutation(s): 0 
Gene Names: recBiorrorAb2820JW2788
EC: 3.1.11.5
Find proteins for P08394 (Escherichia coli (strain K12))
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Go to UniProtKB:  P08394
Protein Feature View
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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: recCb2822JW2790
EC: 3.1.11.5
Find proteins for P07648 (Escherichia coli (strain K12))
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Go to UniProtKB:  P07648
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
RecBCD enzyme subunit RecD D609Escherichia coliMutation(s): 0 
Gene Names: recDhopEb2819JW2787
EC: 3.1.11.5
Find proteins for P04993 (Escherichia coli (strain K12))
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Host-nuclease inhibitor protein gam AE98Escherichia virus LambdaMutation(s): 1 
Gene Names: gamgamma
Find proteins for P03702 (Escherichia phage lambda)
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Go to UniProtKB:  P03702
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 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: 2017-01-11
    Type: Initial release
  • Version 1.1: 2017-08-23
    Changes: Data collection, Experimental preparation, Refinement description
  • Version 1.2: 2018-03-28
    Changes: Structure summary
  • Version 1.3: 2019-10-23
    Changes: Data collection, Other