5FO8

Crystal Structure of Human Complement C3b in Complex with MCP (CCP1-4)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

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This is version 2.0 of the entry. See complete history. 


Literature

Regulators of Complement Activity Mediate Inhibitory Mechanisms Through a Common C3B-Binding Mode.

Forneris, F., Wu, J., Xue, X., Ricklin, D., Lin, Z., Sfyroera, G., Tzekou, A., Volokhina, E., Granneman, J.C., Hauhart, R., Bertram, P., Liszewski, M.K., Atkinson, J.P., Lambris, J.D., Gros, P.

(2016) EMBO J 35: 1133

  • DOI: https://doi.org/10.15252/embj.201593673
  • Primary Citation of Related Structures:  
    5FO7, 5FO8, 5FO9, 5FOA, 5FOB

  • PubMed Abstract: 

    • Regulators of complement activation (RCA) inhibit complement-induced immune responses on healthy host tissues. We present crystal structures of human RCA (MCP, DAF, and CR1) and a smallpox virus homolog (SPICE) bound to complement component C3b. Our structural data reveal that up to four consecutive homologous CCP domains (i-iv), responsible for inhibition, bind in the same orientation and extended arrangement at a shared binding platform on C3b ...

    Regulators of complement activation (RCA) inhibit complement-induced immune responses on healthy host tissues. We present crystal structures of human RCA (MCP, DAF, and CR1) and a smallpox virus homolog (SPICE) bound to complement component C3b. Our structural data reveal that up to four consecutive homologous CCP domains (i-iv), responsible for inhibition, bind in the same orientation and extended arrangement at a shared binding platform on C3b. Large sequence variations in CCP domains explain the diverse C3b-binding patterns, with limited or no contribution of some individual domains, while all regulators show extensive contacts with C3b for the domains at the third site. A variation of ~100° rotation around the longitudinal axis is observed for domains binding at the fourth site on C3b, without affecting the overall binding mode. The data suggest a common evolutionary origin for both inhibitory mechanisms, called decay acceleration and cofactor activity, with variable C3b binding through domains at sites ii, iii, and iv, and provide a framework for understanding RCA disease-related mutations and immune evasion.

    Organizational Affiliation: 

    Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Department of Chemistry, Faculty of Science Utrecht University, Utrecht, The Netherlands p.gros@uu.nl.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
COMPLEMENT C3645Homo sapiensMutation(s): 0 
Gene Names: C3, CPAMD1
EC: 3.4.21.47
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Go to UniProtKB:  P01024
PHAROS:  P01024
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UniProt GroupP01024
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
COMPLEMENT C3915Homo sapiensMutation(s): 0 
Gene Names: C3, CPAMD1
EC: 3.4.21.47
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Find proteins for P01024 (Homo sapiens)
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Go to UniProtKB:  P01024
PHAROS:  P01024
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UniProt GroupP01024
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
MEMBRANE COFACTOR PROTEIN252Homo sapiensMutation(s): 0 
Gene Names: CD46, MCP, MIC10
UniProt & NIH Common Fund Data Resources
Find proteins for P15529 (Homo sapiens)
Explore P15529 
Go to UniProtKB:  P15529
PHAROS:  P15529
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UniProt GroupP15529
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Oligosaccharides

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Entity ID: 4
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
D
2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Entity ID: 5
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
E
3N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO
Download Ideal Coordinates CCD File 
AA [auth B]
BA [auth B]
CA [auth B]
DA [auth B]
EA [auth B]
AA [auth B],
BA [auth B],
CA [auth B],
DA [auth B],
EA [auth B],
F [auth A],
FA [auth B],
G [auth A],
GA [auth B],
H [auth A],
HA [auth B],
I [auth A],
IA [auth B],
J [auth B],
JA [auth B],
K [auth B],
KA [auth B],
L [auth B],
M [auth B],
N [auth B],
O [auth B],
P [auth B],
Q [auth B],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: P 21 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.83α = 90
b = 130.63β = 90
c = 233.83γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-04-06
    Type: Initial release
  • Version 1.1: 2016-06-01
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary