3C9J

The Crystal structure of Transmembrane domain of M2 protein and Amantadine complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.291 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for the function and inhibition of an influenza virus proton channel

Stouffer, A.L.Acharya, R.Salom, D.Levine, A.S.Costanzo, L.D.Soto, C.S.Tereshko, V.Nanda, V.Stayrook, S.DeGrado, W.F.

(2008) Nature 451: 596-600

  • DOI: 10.1038/nature06528
  • Primary Citation of Related Structures:  3BKD

  • PubMed Abstract: 
  • The M2 protein from influenza A virus is a pH-activated proton channel that mediates acidification of the interior of viral particles entrapped in endosomes. M2 is the target of the anti-influenza drugs amantadine and rimantadine; recently, resistanc ...

    The M2 protein from influenza A virus is a pH-activated proton channel that mediates acidification of the interior of viral particles entrapped in endosomes. M2 is the target of the anti-influenza drugs amantadine and rimantadine; recently, resistance to these drugs in humans, birds and pigs has reached more than 90% (ref. 1). Here we describe the crystal structure of the transmembrane-spanning region of the homotetrameric protein in the presence and absence of the channel-blocking drug amantadine. pH-dependent structural changes occur near a set of conserved His and Trp residues that are involved in proton gating. The drug-binding site is lined by residues that are mutated in amantadine-resistant viruses. Binding of amantadine physically occludes the pore, and might also perturb the pK(a) of the critical His residue. The structure provides a starting point for solving the problem of resistance to M2-channel blockers.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Proton Channel protein M2, transmembrane segment
A, B, C, D
25Influenza A virus (strain A/Hong Kong/156/1997 H5N1 genotype Gs/Gd)Gene Names: M
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Other Ion Channels
Protein: 
M2 proton channel (AM2)
Find proteins for O70632 (Influenza A virus (strain A/Hong Kong/156/1997 H5N1 genotype Gs/Gd))
Go to UniProtKB:  O70632
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
308
Query on 308

Download SDF File 
Download CCD File 
B
(3S,5S,7S)-tricyclo[3.3.1.1~3,7~]decan-1-amine
Amantadine
C10 H17 N
DKNWSYNQZKUICI-CHIWXEEVSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.291 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 60.397α = 90.00
b = 57.833β = 90.00
c = 38.105γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
SCALEPACKdata scaling
DENZOdata reduction
MAR345dtbdata collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-03-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance