5NBQ

The structure of the tripartite complex between OspE, the C-terminal domains of factor H and C3dg


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.18 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 

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Literature

Crystal structure of a tripartite complex between C3dg, C-terminal domains of factor H and OspE of Borrelia burgdorferi.

Kolodziejczyk, R.Mikula, K.M.Kotila, T.Postis, V.L.G.Jokiranta, T.S.Goldman, A.Meri, T.

(2017) PLoS One 12: e0188127-e0188127

  • DOI: 10.1371/journal.pone.0188127
  • Primary Citation of Related Structures:  
    5NBQ

  • PubMed Abstract: 
  • Complement is an important part of innate immunity. The alternative pathway of complement is activated when the main opsonin, C3b coats non-protected surfaces leading to opsonisation, phagocytosis and cell lysis. The alternative pathway is tightly contro ...

    Complement is an important part of innate immunity. The alternative pathway of complement is activated when the main opsonin, C3b coats non-protected surfaces leading to opsonisation, phagocytosis and cell lysis. The alternative pathway is tightly controlled to prevent autoactivation towards host cells. The main regulator of the alternative pathway is factor H (FH), a soluble glycoprotein that terminates complement activation in multiple ways. FH recognizes host cell surfaces via domains 19-20 (FH19-20). All microbes including Borrelia burgdorferi, the causative agent of Lyme borreliosis, must evade complement activation to allow the infectious agent to survive in its host. One major mechanism that Borrelia uses is to recruit FH from host. Several outer surface proteins (Osp) have been described to bind FH via the C-terminus, and OspE is one of them. Here we report the structure of the tripartite complex formed by OspE, FH19-20 and C3dg at 3.18 Å, showing that OspE and C3dg can bind simultaneously to FH19-20. This verifies that FH19-20 interacts via the "common microbial binding site" on domain 20 with OspE and simultaneously and independently via domain 19 with C3dg. The spatial organization of the tripartite complex explains how OspE on the bacterial surface binds FH19-20, leaving FH fully available to protect the bacteria against complement. Additionally, formation of tripartite complex between FH, microbial protein and C3dg might enable enhanced protection, particularly on those regions on the bacteria where previous complement activation led to deposition of C3d. This might be especially important for slow-growing bacteria that cause chronic disease like Borrelia burgdorferi.


    Organizational Affiliation

    Division of General Microbiology, Department of Biosciences, University of Helsinki, Helsinki, Finland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Complement C3 ABC294Homo sapiensMutation(s): 1 
Gene Names: C3CPAMD1
Find proteins for P01024 (Homo sapiens)
Explore P01024 
Go to UniProtKB:  P01024
NIH Common Fund Data Resources
PHAROS:  P01024
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Complement factor H DEF127Homo sapiensMutation(s): 0 
Gene Names: CFHHFHF1HF2
Find proteins for P08603 (Homo sapiens)
Explore P08603 
Go to UniProtKB:  P08603
NIH Common Fund Data Resources
PHAROS:  P08603
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Outer surface protein E GI129Borreliella burgdorferiMutation(s): 0 
Gene Names: OspE
Find proteins for Q45001 (Borrelia burgdorferi)
Explore Q45001 
Go to UniProtKB:  Q45001
Protein Feature View
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Outer surface protein E,Outer surface protein E H134Borreliella burgdorferiMutation(s): 0 
Gene Names: OspE
Find proteins for Q45001 (Borrelia burgdorferi)
Explore Q45001 
Go to UniProtKB:  Q45001
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.18 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 124.907α = 90
b = 165.063β = 90
c = 84.185γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XSCALEdata scaling
PHASERphasing
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Academy of FinlandFinland255922 and 259793
Sigrid Juselius FoundationFinland--

Revision History 

  • Version 1.0: 2017-12-06
    Type: Initial release
  • Version 1.1: 2017-12-13
    Changes: Database references