4A5W

Crystal structure of C5b6


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.256 

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This is version 1.4 of the entry. See complete history


Literature

Assembly and Regulation of the Membrane Attack Complex Based on Structures of C5B6 and Sc5B9.

Hadders, M.A.Bubeck, D.Roversi, P.Hakobyan, S.Forneris, F.Morgan, B.P.Pangburn, M.K.Llorca, O.Lea, S.M.Gros, P.

(2012) Cell Rep 1: 200

  • DOI: 10.1016/j.celrep.2012.02.003
  • Primary Citation of Related Structures:  
    4A5W

  • PubMed Abstract: 
  • Activation of the complement system results in formation of membrane attack complexes (MACs), pores that disrupt lipid bilayers and lyse bacteria and other pathogens. Here, we present the crystal structure of the first assembly intermediate, C5b6, together with a cryo-electron microscopy reconstruction of a soluble, regulated form of the pore, sC5b9 ...

    Activation of the complement system results in formation of membrane attack complexes (MACs), pores that disrupt lipid bilayers and lyse bacteria and other pathogens. Here, we present the crystal structure of the first assembly intermediate, C5b6, together with a cryo-electron microscopy reconstruction of a soluble, regulated form of the pore, sC5b9. Cleavage of C5 to C5b results in marked conformational changes, distinct from those observed in the homologous C3-to-C3b transition. C6 captures this conformation, which is preserved in the larger sC5b9 assembly. Together with antibody labeling, these structures reveal that complement components associate through sideways alignment of the central MAC-perforin (MACPF) domains, resulting in a C5b6-C7-C8β-C8α-C9 arc. Soluble regulatory proteins below the arc indicate a potential dual mechanism in protection from pore formation. These results provide a structural framework for understanding MAC pore formation and regulation, processes important for fighting infections and preventing complement-mediated tissue damage.


    Organizational Affiliation

    Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Department of Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
COMPLEMENT C5 A1580Homo sapiensMutation(s): 0 
Gene Names: C5CPAMD4
Find proteins for P01031 (Homo sapiens)
Explore P01031 
Go to UniProtKB:  P01031
NIH Common Fund Data Resources
PHAROS:  P01031
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
COMPLEMENT COMPONENT C6 B913Homo sapiensMutation(s): 0 
Gene Names: C6
Find proteins for P13671 (Homo sapiens)
Explore P13671 
Go to UniProtKB:  P13671
NIH Common Fund Data Resources
PHAROS:  P13671
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.256 
  • Space Group: I 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 154.217α = 90
b = 230.747β = 90
c = 269.983γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-03-14
    Type: Initial release
  • Version 1.1: 2012-05-09
    Changes: Other
  • Version 1.2: 2012-10-31
    Changes: Database references
  • Version 1.3: 2019-11-13
    Changes: Data collection, Database references, Derived calculations, Other
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary