6PVT

Influenza B M2 Proton Channel in the Open State - SSNMR Structure at pH 4.5


Experimental Data Snapshot

  • Method: SOLID-STATE NMR
  • Conformers Calculated: 120 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Atomic structures of closed and open influenza B M2 proton channel reveal the conduction mechanism.

Mandala, V.S.Loftis, A.R.Shcherbakov, A.A.Pentelute, B.L.Hong, M.

(2020) Nat Struct Mol Biol 27: 160-167

  • DOI: https://doi.org/10.1038/s41594-019-0371-2
  • Primary Citation of Related Structures:  
    6PVR, 6PVT

  • PubMed Abstract: 

    The influenza B M2 (BM2) proton channel is activated by acidic pH to mediate virus uncoating. Unlike influenza A M2 (AM2), which conducts protons with strong inward rectification, BM2 conducts protons both inward and outward. Here we report 1.4- and 1.5-Å solid-state NMR structures of the transmembrane domain of the closed and open BM2 channels in a phospholipid environment. Upon activation, the transmembrane helices increase the tilt angle by 6° and the average pore diameter enlarges by 2.1 Å. BM2 thus undergoes a scissor motion for activation, which differs from the alternating-access motion of AM2. These results indicate that asymmetric proton conduction requires a backbone hinge motion, whereas bidirectional conduction is achieved by a symmetric scissor motion. The proton-selective histidine and gating tryptophan in the open BM2 reorient on the microsecond timescale, similar to AM2, indicating that side chain dynamics are the essential driver of proton shuttling.


  • Organizational Affiliation

    Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
BM2 protein
A, B, C, D
51Influenza B virus (B/Maryland/1/2001)Mutation(s): 0 
Gene Names: BM2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLID-STATE NMR
  • Conformers Calculated: 120 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM088204

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-05
    Type: Initial release
  • Version 1.1: 2020-02-19
    Changes: Database references
  • Version 1.2: 2020-02-26
    Changes: Database references
  • Version 1.3: 2023-06-14
    Changes: Database references, Other
  • Version 1.4: 2024-05-15
    Changes: Data collection, Database references