2L0J

Solid State NMR structure of the M2 proton channel from Influenza A Virus in hydrated lipid bilayer

• PDB DOI:  https://doi.org/10.2210/pdb2L0J/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Influenza A virus (A/Udorn/307/1972(H3N2))
• Expression System: Escherichia coli
• Mutation(s): Yes 
• Membrane Protein: Yes  PDBTMMemProtMDmpstruc


• Deposited: 2010-07-08 Released: 2010-11-03 
• Deposition Author(s): Sharma, M., Yi, M., Dong, H., Qin, H., Peterson, E., Busath, D.D., Zhou, H.X., Cross, T.A.

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Experimental Data Snapshot

• Method: SOLID-STATE NMR
• Conformers Calculated: 8 
• Conformers Submitted: 8 
• Selection Criteria: structures with the least restraint violations 

Literature

Insight into the mechanism of the influenza a proton channel from a structure in a lipid bilayer.

Sharma, M., Yi, M., Dong, H., Qin, H., Peterson, E., Busath, D.D., Zhou, H.X., Cross, T.A.

(2010) Science 330: 509-512

• PubMed: 20966252 
• DOI: https://doi.org/10.1126/science.1191750
• Primary Citation of Related Structures:  
  2L0J


• PubMed Abstract: 
  

  The M2 protein from the influenza A virus, an acid-activated proton-selective channel, has been the subject of numerous conductance, structural, and computational studies. However, little is known at the atomic level about the heart of the functional mechanism for this tetrameric protein, a His(37)-Trp(41) cluster. We report the structure of the M2 conductance domain (residues 22 to 62) in a lipid bilayer, which displays the defining features of the native protein that have not been attainable from structures solubilized by detergents. We propose that the tetrameric His(37)-Trp(41) cluster guides protons through the channel by forming and breaking hydrogen bonds between adjacent pairs of histidines and through specific interactions of the histidines with the tryptophan gate. This mechanism explains the main observations on M2 proton conductance.

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Organizational Affiliation: 

Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C4  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 20.09 kDa 
• Atom Count: 1,348 
• Modelled Residue Count: 164 
• Deposited Residue Count: 176 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Matrix protein 2	A, B, C, D	44	Influenza A virus (A/Udorn/307/1972(H3N2))	Mutation(s): 1  Gene Names: M Membrane Entity: Yes
UniProt
Find proteins for P0DOF5 (Influenza A virus (strain A/Udorn/307/1972 H3N2)) Explore P0DOF5  Go to UniProtKB:  P0DOF5

Experimental Data & Validation

Experimental Data

• Method: SOLID-STATE NMR
• Conformers Calculated: 8 
• Conformers Submitted: 8 
• Selection Criteria: structures with the least restraint violations 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-11-03 
Deposition Author(s): Sharma, M., Yi, M., Dong, H., Qin, H., Peterson, E., Busath, D.D., Zhou, H.X., Cross, T.A.

Revision History  

• Version 1.0: 2010-11-03
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance