Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 5-mer - A2B1C1D1 

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 353.51 kDa 
• Atom Count: 24118 
• Modelled Residue Count: 3014 
• Deposited Residue Count: 3108 
• Unique protein chains: 4

5MBV

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

• DOI: 10.2210/pdb5MBV/pdb
• EMDataResource: EMD-3460

• Classification: DNA BINDING PROTEIN
• Organism(s): Escherichia coli, Escherichia virus Lambda
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2016-11-08 Released: 2017-01-11 
• Deposition Author(s): Wilkinson, M., Chaban, Y., Wigley, D.B.

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Experimental Data Snapshot

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

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

• PubMed: 28009252 
• 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. 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.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RecBCD enzyme subunit RecB	B	1181	Escherichia coli	Mutation(s): 0  Gene Names: recB, ior, rorA, b2820, JW2788 EC: 3.1.11.5
Find proteins for P08394 (Escherichia coli (strain K12)) Explore P08394  Go to UniProtKB:  P08394

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
RecBCD enzyme subunit RecC	C	1122	Escherichia coli	Mutation(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

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
RecBCD enzyme subunit RecD	D	609	Escherichia coli	Mutation(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

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Host-nuclease inhibitor protein gam	A, E	98	Escherichia virus Lambda	Mutation(s): 1  Gene Names: gam, gamma
Find proteins for P03702 (Escherichia phage lambda) Explore P03702  Go to UniProtKB:  P03702

Experimental Data & Validation

Experimental Data

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2016-11-08 
• Released Date: 2017-01-11 
Deposition Author(s): Wilkinson, M., Chaban, Y., Wigley, D.B.

Revision History  

• 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