6RU5

human complement C3 in complex with the hC3Nb1 nanobody


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.90 Å

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Structural Basis for Properdin Oligomerization and Convertase Stimulation in the Human Complement System.

Pedersen, D.V.Gadeberg, T.A.F.Thomas, C.Wang, Y.Joram, N.Jensen, R.K.Mazarakis, S.M.M.Revel, M.El Sissy, C.Petersen, S.V.Lindorff-Larsen, K.Thiel, S.Laursen, N.S.Fremeaux-Bacchi, V.Andersen, G.R.

(2019) Front Immunol 10: 2007-2007

  • DOI: 10.3389/fimmu.2019.02007
  • Primary Citation of Related Structures:  
    6RU3, 6RU5, 6RUR, 6RUS, 6RUV, 6RV6, 6SEJ

  • PubMed Abstract: 
  • Properdin (FP) is a positive regulator of the immune system stimulating the activity of the proteolytically active C3 convertase C3bBb in the alternative pathway of the complement system. Here we present two crystal structures of FP and two structures of convertase bound FP ...

    Properdin (FP) is a positive regulator of the immune system stimulating the activity of the proteolytically active C3 convertase C3bBb in the alternative pathway of the complement system. Here we present two crystal structures of FP and two structures of convertase bound FP. A structural core formed by three thrombospondin repeats (TSRs) and a TB domain harbors the convertase binding site in FP that mainly interacts with C3b. Stabilization of the interaction between the C3b C-terminus and the MIDAS bound Mg 2+ in the Bb protease by FP TSR5 is proposed to underlie FP convertase stabilization. Intermolecular contacts between FP and the convertase subunits suggested by the structure were confirmed by binding experiments. FP is shown to inhibit C3b degradation by FI due to a direct competition for a common binding site on C3b. FP oligomers are held together by two sets of intermolecular contacts, where the first is formed by the TB domain from one FP molecule and TSR4 from another. The second and largest interface is formed by TSR1 and TSR6 from the same two FP molecules. Flexibility at four hinges between thrombospondin repeats is suggested to enable the oligomeric, polydisperse, and extended architecture of FP. Our structures rationalize the effects of mutations associated with FP deficiencies and provide a structural basis for the analysis of FP function in convertases and its possible role in pattern recognition.


    Related Citations: 
    • Crystal structure of peptide-bound neprilysin reveals key binding interactions.
      Moss, S., Subramanian, V., Acharya, K.R.
      (2019) FEBS Lett --: --

    Organizational Affiliation

    Department of Molecular Biology and Genetics, Center for Structural Biology, Aarhus University, Aarhus, Denmark.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Complement C3A645Homo sapiensMutation(s): 0 
Gene Names: C3CPAMD1
UniProt & NIH Common Fund Data Resources
Find proteins for P01024 (Homo sapiens)
Explore P01024 
Go to UniProtKB:  P01024
PHAROS:  P01024
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Complement C3B992Homo sapiensMutation(s): 0 
Gene Names: C3CPAMD1
UniProt & NIH Common Fund Data Resources
Find proteins for P01024 (Homo sapiens)
Explore P01024 
Go to UniProtKB:  P01024
PHAROS:  P01024
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
hC3Nb1C130Lama glamaMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 4
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseD5N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G22768VO
GlyCosmos:  G22768VO
GlyGen:  G22768VO
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
E [auth A]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.90 Å
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 228.32α = 90
b = 140.72β = 100.508
c = 95.43γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
LundbeckfondenDenmarkR155-2015-2666

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-21
    Type: Initial release
  • Version 1.1: 2019-09-25
    Changes: Data collection, Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary