8GTT

Cryo-EM structure of human Pannexin1 resembling Pannexin2 pore with W74R/R75Dmutations


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Cryo-EM structures of pannexin 1 and 3 reveal differences among pannexin isoforms.

Hussain, N.Apotikar, A.Pidathala, S.Mukherjee, S.Burada, A.P.Sikdar, S.K.Vinothkumar, K.R.Penmatsa, A.

(2024) Nat Commun 15: 2942-2942

  • DOI: https://doi.org/10.1038/s41467-024-47142-6
  • Primary Citation of Related Structures:  
    8GTR, 8GTS, 8GTT

  • PubMed Abstract: 

    Pannexins are single-membrane large-pore channels that release ions and ATP upon activation. Three isoforms of pannexins 1, 2, and 3, perform diverse cellular roles and differ in their pore lining residues. In this study, we report the cryo-EM structure of pannexin 3 at 3.9 Å and analyze its structural differences with pannexin isoforms 1 and 2. The pannexin 3 vestibule has two distinct chambers and a wider pore radius in comparison to pannexins 1 and 2. We further report two cryo-EM structures of pannexin 1, with pore substitutions W74R/R75D that mimic the pore lining residues of pannexin 2 and a germline mutant of pannexin 1, R217H at resolutions of 3.2 Å and 3.9 Å, respectively. Substitution of cationic residues in the vestibule of pannexin 1 results in reduced ATP interaction propensities to the channel. The germline mutant R217H in transmembrane helix 3 (TM3), leads to a partially constricted pore, reduced ATP interaction and weakened voltage sensitivity. The study compares the three pannexin isoform structures, the effects of substitutions of pore and vestibule-lining residues and allosteric effects of a pathological substitution on channel structure and function thereby enhancing our understanding of this vital group of ATP-release channels.


  • Organizational Affiliation

    Molecular Biophysics Unit, Indian Institute of Science, Bangalore, 560012, India.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pannexin-1
A, B, C, D, E
A, B, C, D, E, F, G
434Homo sapiensMutation(s): 2 
Gene Names: PANX1MRS1UNQ2529/PRO6028
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q96RD7 (Homo sapiens)
Explore Q96RD7 
Go to UniProtKB:  Q96RD7
PHAROS:  Q96RD7
GTEx:  ENSG00000110218 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96RD7
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC
MODEL REFINEMENTPHENIX

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Department of Biotechnology (DBT, India)IndiaIA/S/22/1/506242

Revision History  (Full details and data files)

  • Version 1.0: 2024-02-28
    Type: Initial release
  • Version 1.1: 2024-06-19
    Changes: Database references