6H03

OPEN CONFORMATION OF THE MEMBRANE ATTACK COMPLEX


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report



Literature

CryoEM reveals how the complement membrane attack complex ruptures lipid bilayers.

Menny, A.Serna, M.Boyd, C.M.Gardner, S.Joseph, A.P.Morgan, B.P.Topf, M.Brooks, N.J.Bubeck, D.

(2018) Nat Commun 9: 5316-5316

  • DOI: 10.1038/s41467-018-07653-5
  • Primary Citation of Related Structures:  
    6H03, 6H04

  • PubMed Abstract: 
  • The membrane attack complex (MAC) is one of the immune system's first responders. Complement proteins assemble on target membranes to form pores that lyse pathogens and impact tissue homeostasis of self-cells. How MAC disrupts the membrane barrier re ...

    The membrane attack complex (MAC) is one of the immune system's first responders. Complement proteins assemble on target membranes to form pores that lyse pathogens and impact tissue homeostasis of self-cells. How MAC disrupts the membrane barrier remains unclear. Here we use electron cryo-microscopy and flicker spectroscopy to show that MAC interacts with lipid bilayers in two distinct ways. Whereas C6 and C7 associate with the outer leaflet and reduce the energy for membrane bending, C8 and C9 traverse the bilayer increasing membrane rigidity. CryoEM reconstructions reveal plasticity of the MAC pore and demonstrate how C5b6 acts as a platform, directing assembly of a giant β-barrel whose structure is supported by a glycan scaffold. Our work provides a structural basis for understanding how β-pore forming proteins breach the membrane and reveals a mechanism for how MAC kills pathogens and regulates cell functions.


    Organizational Affiliation

    Department of Life Sciences, Sir Ernst Chain Building, Imperial College London, London, SW7 2AZ, UK. d.bubeck@imperial.ac.uk.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Complement C5,Complement C5A1580Homo sapiensMutation(s): 0 
Gene Names: C5
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Adventitious Membrane Proteins: Beta-sheet Pore-forming Toxins/Attack Complexes
Protein: 
Membrane attack complex (MAC) in open conformation
Find proteins for P01031 (Homo sapiens)
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PHAROS  P01031
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Complement component C8 beta chainC537Homo sapiensMutation(s): 0 
Gene Names: C8B
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Adventitious Membrane Proteins: Beta-sheet Pore-forming Toxins/Attack Complexes
Protein: 
Membrane attack complex (MAC) in open conformation
Find proteins for P07358 (Homo sapiens)
Explore P07358 
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PHAROS  P07358
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Complement component C7D821Homo sapiensMutation(s): 0 
Gene Names: C7
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Adventitious Membrane Proteins: Beta-sheet Pore-forming Toxins/Attack Complexes
Protein: 
Membrane attack complex (MAC) in open conformation
Find proteins for P10643 (Homo sapiens)
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PHAROS  P10643
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Complement component C8 gamma chainE182Homo sapiensMutation(s): 0 
Gene Names: C8G
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Adventitious Membrane Proteins: Beta-sheet Pore-forming Toxins/Attack Complexes
Protein: 
Membrane attack complex (MAC) in open conformation
Find proteins for P07360 (Homo sapiens)
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PHAROS  P07360
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Complement component C8 alpha chainF554Homo sapiensMutation(s): 0 
Gene Names: C8A
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Adventitious Membrane Proteins: Beta-sheet Pore-forming Toxins/Attack Complexes
Protein: 
Membrane attack complex (MAC) in open conformation
Find proteins for P07357 (Homo sapiens)
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PHAROS  P07357
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Complement component C6B913Homo sapiensMutation(s): 0 
Gene Names: C6
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Adventitious Membrane Proteins: Beta-sheet Pore-forming Toxins/Attack Complexes
Protein: 
Membrane attack complex (MAC) in open conformation
Find proteins for P13671 (Homo sapiens)
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PHAROS  P13671
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
Complement component C9GHIJKLMNOPQRSTUVWX538Homo sapiensMutation(s): 0 
Gene Names: C9
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Adventitious Membrane Proteins: Beta-sheet Pore-forming Toxins/Attack Complexes
Protein: 
Membrane attack complex (MAC) in open conformation
Find proteins for P02748 (Homo sapiens)
Explore P02748 
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PHAROS  P02748
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Oligosaccharides

Help

Entity ID: 8
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
Y
3 N-Glycosylation Oligosaccharides Interaction
Entity ID: 9
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
Z, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s
2 N-Glycosylation Oligosaccharides Interaction
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download CCD File 
F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Cancer Research UKUnited KingdomC26409/A16099
Medical Research Council (United Kingdom)United KingdomMR/M019292/1

Revision History 

  • Version 1.0: 2018-12-19
    Type: Initial release
  • Version 1.1: 2018-12-26
    Changes: Author supporting evidence, Data collection, Database references
  • Version 1.2: 2019-12-11
    Changes: Other
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary