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 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

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

  • 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 co ...

    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 Biochemistry, Department of Biosciences, University of Helsinki, Helsinki, Finland.,Biomedicine Research Group, Faculty of Health and Social Sciences, Leeds Beckett University, Leeds, United Kingdom.,Research Programs Unit, Immunobiology, University of Helsinki, Helsinki, Finland.,Division of General Microbiology, Department of Biosciences, University of Helsinki, Helsinki, Finland.,Institute of Biotechnology, University of Helsinki, Helsinki, Finland.,Astbury Centre for Structural Molecular Biology, School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Complement C3
A, B, C
294Homo sapiensMutation(s): 1 
Gene Names: C3 (CPAMD1)
Find proteins for P01024 (Homo sapiens)
Go to Gene View: C3
Go to UniProtKB:  P01024
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Complement factor H
D, E, F
127Homo sapiensMutation(s): 0 
Gene Names: CFH (HF, HF1, HF2)
Find proteins for P08603 (Homo sapiens)
Go to Gene View: CFH
Go to UniProtKB:  P08603
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Outer surface protein E
G, I
129Borreliella burgdorferiMutation(s): 0 
Gene Names: OspE
Find proteins for Q45001 (Borreliella burgdorferi)
Go to UniProtKB:  Q45001
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Outer surface protein E,Outer surface protein E
H
134Borreliella burgdorferiMutation(s): 0 
Gene Names: OspE
Find proteins for Q45001 (Borreliella burgdorferi)
Go to UniProtKB:  Q45001
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
H
L-PEPTIDE LINKINGC4 H9 N O2

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.18 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.233 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 124.907α = 90.00
b = 165.063β = 90.00
c = 84.185γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
PDB_EXTRACTdata extraction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



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
    Type: Database references