3KM9

Structure of complement C5 in complex with the C-terminal beta-grasp domain of SSL7


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.20 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.236 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Structural basis for inhibition of complement C5 by the SSL7 protein from Staphylococcus aureus

Laursen, N.S.Gordon, N.Hermans, S.Lorenz, N.Jackson, N.Wines, B.Spillner, E.Christensen, J.B.Jensen, M.Fredslund, F.Bjerre, M.Sottrup-Jensen, L.Fraser, J.D.Andersen, G.R.

(2010) Proc Natl Acad Sci U S A 107: 3681-3686

  • DOI: 10.1073/pnas.0910565107
  • Primary Citation of Related Structures:  
    3KLS, 3KM9

  • PubMed Abstract: 
  • Staphylococcus aureus secretes the SSL7 protein as part of its immune evasion strategy. The protein binds both complement C5 and IgA, yet it is unclear whether SSL7 cross-links these two proteins and, if so, what purpose this serves the pathogen. We have isolated a stable IgA-SSL7-C5 complex, and our crystal structure of the C5-SSL7 complex confirms that binding to C5 occurs exclusively through the C-terminal beta-grasp domain of SSL7 leaving the OB domain free to interact with IgA ...

    Staphylococcus aureus secretes the SSL7 protein as part of its immune evasion strategy. The protein binds both complement C5 and IgA, yet it is unclear whether SSL7 cross-links these two proteins and, if so, what purpose this serves the pathogen. We have isolated a stable IgA-SSL7-C5 complex, and our crystal structure of the C5-SSL7 complex confirms that binding to C5 occurs exclusively through the C-terminal beta-grasp domain of SSL7 leaving the OB domain free to interact with IgA. SSL7 interacts with C5 >70 A from the C5a cleavage site without inducing significant conformational changes in C5, and efficient inhibition of convertase cleavage of C5 is shown to be IgA dependent. Inhibition of C5a production and bacteriolysis are all shown to require C5 and IgA binding while inhibition of hemolysis is achieved by the C5 binding SSL7 beta-grasp domain alone. These results provide a conceptual and structural basis for the development of a highly specific complement inhibitor preventing only the formation of the lytic membrane attack complex without affecting the important signaling functions of C5a.


    Organizational Affiliation

    Department of Molecular Biology, University of Aarhus, DK-8000 Aarhus, Denmark.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Complement C5A, C [auth B]1676Homo 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
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Staphylococcal enterotoxin-like toxinB [auth X], D [auth Y]103Staphylococcus aureus subsp. aureus str. NewmanMutation(s): 0 
Gene Names: ssl7NWMN_0394
Find proteins for A0A0H3K6Z8 (Staphylococcus aureus (strain Newman))
Explore A0A0H3K6Z8 
Go to UniProtKB:  A0A0H3K6Z8
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 3
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseE [auth C], F [auth D]2 N-Glycosylation Oligosaccharides Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.20 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.236 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 144.79α = 90
b = 144.79β = 90
c = 245.28γ = 120
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.2: 2017-11-01
    Changes: Refinement description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary