Cryo-EM structure of Ca2+-bound mTMEM16F F518A Q623A mutant in GDN open/closed

Experimental Data Snapshot

  • Resolution: 3.09 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

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Structural basis for the activation of the lipid scramblase TMEM16F.

Arndt, M.Alvadia, C.Straub, M.S.Clerico Mosina, V.Paulino, C.Dutzler, R.

(2022) Nat Commun 13: 6692-6692

  • DOI: https://doi.org/10.1038/s41467-022-34497-x
  • Primary Citation of Related Structures:  
    8B8G, 8B8J, 8B8K, 8B8M, 8B8Q, 8BC0, 8BC1

  • PubMed Abstract: 

    TMEM16F, a member of the conserved TMEM16 family, plays a central role in the initiation of blood coagulation and the fusion of trophoblasts. The protein mediates passive ion and lipid transport in response to an increase in intracellular Ca 2+ . However, the mechanism of how the protein facilitates both processes has remained elusive. Here we investigate the basis for TMEM16F activation. In a screen of residues lining the proposed site of conduction, we identify mutants with strongly activating phenotype. Structures of these mutants determined herein by cryo-electron microscopy show major rearrangements leading to the exposure of hydrophilic patches to the membrane, whose distortion facilitates lipid diffusion. The concomitant opening of a pore promotes ion conduction in the same protein conformation. Our work has revealed a mechanism that is distinct for this branch of the family and that will aid the development of a specific pharmacology for a promising drug target.

  • Organizational Affiliation

    Department of Biochemistry University of Zurich, Winterthurer Str. 190, CH-8057, Zurich, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
975Mus musculusMutation(s): 2 
Gene Names: Ano6Tmem16f
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q6P9J9 (Mus musculus)
Explore Q6P9J9 
Go to UniProtKB:  Q6P9J9
IMPC:  MGI:2145890
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6P9J9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.09 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
European Research Council (ERC)European Union339116

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-16
    Type: Initial release