Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 24-mer - A18BCDEFG Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 24-mer -A20B2CD 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: authors reported there is no experimental evidence

Macromolecule Content

• Total Structure Weight: 1630616.63 
• Atom Count: 97178 
• Residue Count: 14271 
• Unique protein chains: 7

6H04

Closed conformation of the Membrane Attack Complex

• DOI: 10.2210/pdb6H04/pdb
• EMDataResource: EMD-0107

• Classification: IMMUNE SYSTEM
• Organism(s): Homo sapiens


• Deposited: 2018-07-06 Released: 2018-12-19 
• Deposition Author(s): Menny, A., Serna, M., Boyd, C.M., Gardner, S., Joseph, A.P., Topf, M., Bubeck, D.
• Funding Organization(s): Cancer Research UK; Medical Research Council (United Kingdom) 

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 5.6 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

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

• PubMed: 30552328 
• DOI: 10.1038/s41467-018-07653-5
• Primary Citation of Related Structures:  
  6H03


• 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 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.

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Organizational Affiliation: 

Department of Life Sciences, Sir Ernst Chain Building, Imperial College London, London, SW7 2AZ, UK.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Complement component C9	L, M, N, O, Q, R, S, T, U, V, W, X, P, H, I, J, K, G	538	Homo sapiens	Mutation(s): 0  Gene Names: C9
Find proteins for P02748 (Homo sapiens) Go to Gene View: C9 Go to UniProtKB:  P02748

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Complement C5,Complement C5	A	1580	Homo sapiens	Mutation(s): 0  Gene Names: C5 (CPAMD4)
Find proteins for P01031 (Homo sapiens) Go to Gene View: C5 Go to UniProtKB:  P01031

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
Complement component C8 beta chain	C	537	Homo sapiens	Mutation(s): 0  Gene Names: C8B
Find proteins for P07358 (Homo sapiens) Go to Gene View: C8B Go to UniProtKB:  P07358

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details
Complement component C7	D	821	Homo sapiens	Mutation(s): 0  Gene Names: C7
Find proteins for P10643 (Homo sapiens) Go to Gene View: C7 Go to UniProtKB:  P10643

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details
Complement component C8 gamma chain	E	182	Homo sapiens	Mutation(s): 0  Gene Names: C8G
Find proteins for P07360 (Homo sapiens) Go to Gene View: C8G Go to UniProtKB:  P07360

Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details
Complement component C8 alpha chain	F	554	Homo sapiens	Mutation(s): 0  Gene Names: C8A
Find proteins for P07357 (Homo sapiens) Go to Gene View: C8A Go to UniProtKB:  P07357

Entity ID: 7
Molecule	Chains	Sequence Length	Organism	Details
Complement component C6	B	913	Homo sapiens	Mutation(s): 0  Gene Names: C6
Find proteins for P13671 (Homo sapiens) Go to Gene View: C6 Go to UniProtKB:  P13671

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
NAG	B, C, D, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 5.6 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2018-07-06 
• Released Date: 2018-12-19 
• Deposition Author(s): Menny, A., Serna, M., Boyd, C.M., Gardner, S., Joseph, A.P., Topf, M., Bubeck, D.

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Funding Organization	Location	Grant Number
Cancer Research UK	United Kingdom	C26409/A16099
Medical Research Council (United Kingdom)	United Kingdom	MR/M019292/1

Revision History 

• Version 1.0: 2018-12-19
  Type: Initial release
• Version 1.1: 2018-12-26
  Type: Data collection, Database references