Macromolecule Content

• Total Structure Weight: 20.14 kDa 
• Atom Count: 1276 
• Residue Count: 152 
• Unique protein chains: 1

2KIH

S31N mutant of M2 proton channel

• DOI: 10.2210/pdb2KIH/pdb

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


• Deposited: 2009-05-05 Released: 2009-05-19 
• Deposition Author(s): Pielak, R.M.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 30 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 

Literature

Mechanism of drug inhibition and drug resistance of influenza A M2 channel.

Pielak, R.M., Schnell, J.R., Chou, J.J.

(2009) Proc Natl Acad Sci U S A 106: 7379-7384

• PubMed: 19383794 
• DOI: 10.1073/pnas.0902548106
• Primary Citation of Related Structures:  
  2KIH


• PubMed Abstract: 
  

The influenza A virus M2 proton channel equilibrates pH across the viral membrane during entry and across the trans-Golgi membrane of infected cells during viral maturation. It is an important target of adamantane-family antiviral drugs, but drug resistance has become a critical problem. Two different sites for drug interaction have been proposed. One is a lipid-facing pocket between 2 adjacent transmembrane helices (around Asp-44), at which the drug binds and inhibits proton conductance allosterically. The other is inside the pore (around Ser-31), at which the drug directly blocks proton passage. Here, we describe structural and functional experiments on the mechanism of drug inhibition and resistance. The solution structure of the S31N drug-resistant mutant of M2, a mutant of the highly pathogenic avian influenza subtype H5N1, shows that replacing Ser-31 with Asn has little effect on the structure of the channel pore, but dramatically reduces drug binding to the allosteric site. Mutagenesis and liposomal proton flux assays show that replacing the key residue (Asp-44) in the lipid-facing binding pocket with Ala has a dramatic effect on drug sensitivity, but that the channel remains fully drug sensitive when replacing Ser-31 with Ala. Chemical cross-linking studies indicate an inverse correlation between channel stability and drug resistance. The lipid-facing pocket contains residues from 2 adjacent channel-forming helices. Therefore, it is present only when the helices are tightly packed in the closed conformation. Thus, drug-resistant mutants impair drug binding by destabilizing helix-helix assembly.

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Organizational Affiliation: 

Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Matrix protein 2	A, B, C, D	43	Influenza A virus (A/Udorn/307/1972(H3N2))	Mutation(s): 3  Gene Names: M
Membrane protein Mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  Channels: Other Ion Channels	Protein:  M2 proton channel (AM2) H5N1 S31N drug-resistant mutant
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: SOLUTION NMR
• Conformers Calculated: 30 
• Conformers Submitted: 10 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2KIH Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-05-05 
• Released Date: 2009-05-19 
Deposition Author(s): Pielak, R.M.

Revision History 

• Version 1.0: 2009-05-19
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance