6DLW

Complement component polyC9


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The first transmembrane region of complement component-9 acts as a brake on its self-assembly.

Spicer, B.A.Law, R.H.P.Caradoc-Davies, T.T.Ekkel, S.M.Bayly-Jones, C.Pang, S.S.Conroy, P.J.Ramm, G.Radjainia, M.Venugopal, H.Whisstock, J.C.Dunstone, M.A.

(2018) Nat Commun 9: 3266-3266

  • DOI: 10.1038/s41467-018-05717-0
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Complement component 9 (C9) functions as the pore-forming component of the Membrane Attack Complex (MAC). During MAC assembly, multiple copies of C9 are sequentially recruited to membrane associated C5b8 to form a pore. Here we determined the 2.2 Å c ...

    Complement component 9 (C9) functions as the pore-forming component of the Membrane Attack Complex (MAC). During MAC assembly, multiple copies of C9 are sequentially recruited to membrane associated C5b8 to form a pore. Here we determined the 2.2 Å crystal structure of monomeric murine C9 and the 3.9 Å resolution cryo EM structure of C9 in a polymeric assembly. Comparison with other MAC proteins reveals that the first transmembrane region (TMH1) in monomeric C9 is uniquely positioned and functions to inhibit its self-assembly in the absence of C5b8. We further show that following C9 recruitment to C5b8, a conformational change in TMH1 permits unidirectional and sequential binding of additional C9 monomers to the growing MAC. This mechanism of pore formation contrasts with related proteins, such as perforin and the cholesterol dependent cytolysins, where it is believed that pre-pore assembly occurs prior to the simultaneous release of the transmembrane regions.


    Organizational Affiliation

    Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, 23 Innovation Walk, Monash University, Victoria, 3800, Australia.,Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria, 3168, Australia.,South East University-Monash Joint Institute, Institute of Life Sciences, Southeast University, 210096, Nanjing, China. James.Whisstock@monash.edu.,ARC Centre of Excellence in Advanced Molecular Imaging, Department of Biochemistry and Molecular Biology, 23 Innovation Walk, Monash University, Victoria, 3800, Australia. Michelle.Dunstone@monash.edu.,Achtseweg Noord 5, Building, 5651 GG, Eindhoven, The Netherlands.,Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, 23 Innovation Walk, Monash University, Victoria, 3800, Australia. Michelle.Dunstone@monash.edu.,ARC Centre of Excellence in Advanced Molecular Imaging, Department of Biochemistry and Molecular Biology, 23 Innovation Walk, Monash University, Victoria, 3800, Australia.,Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, 23 Innovation Walk, Monash University, Victoria, 3800, Australia. James.Whisstock@monash.edu.,EMBL Australia, Monash University, Melbourne, Australia. James.Whisstock@monash.edu.,ARC Centre of Excellence in Advanced Molecular Imaging, Department of Biochemistry and Molecular Biology, 23 Innovation Walk, Monash University, Victoria, 3800, Australia. James.Whisstock@monash.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Complement component C9
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V
538Homo 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: 
poly-C9 component of the complement membrane attack Complex
Find proteins for P02748 (Homo sapiens)
Go to Gene View: C9
Go to UniProtKB:  P02748
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BMA
Query on BMA

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V
BETA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-RWOPYEJCSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Australian Research Council (ARC)Australia--

Revision History 

  • Version 1.0: 2018-09-12
    Type: Initial release
  • Version 1.1: 2020-01-01
    Type: Author supporting evidence