6P46

Cryo-EM structure of TMEM16F in digitonin with calcium bound


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Cryo-EM Studies of TMEM16F Calcium-Activated Ion Channel Suggest Features Important for Lipid Scrambling.

Feng, S.Dang, S.Han, T.W.Ye, W.Jin, P.Cheng, T.Li, J.Jan, Y.N.Jan, L.Y.Cheng, Y.

(2019) Cell Rep 28: 567-579.e4

  • DOI: 10.1016/j.celrep.2019.06.023
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • As a Ca <sup>2+ </sup>-activated lipid scramblase and ion channel that mediates Ca <sup>2+ </sup> influx, TMEM16F relies on both functions to facilitate extracellular vesicle generation, blood coagulation, and bone formation. How a bona fide ion chan ...

    As a Ca 2+ -activated lipid scramblase and ion channel that mediates Ca 2+ influx, TMEM16F relies on both functions to facilitate extracellular vesicle generation, blood coagulation, and bone formation. How a bona fide ion channel scrambles lipids remains elusive. Our structural analyses revealed the coexistence of an intact channel pore and PIP 2 -dependent protein conformation changes leading to membrane distortion. Correlated to the extent of membrane distortion, many tightly bound lipids are slanted. Structure-based mutagenesis studies further reveal that neutralization of some lipid-binding residues or those near membrane distortion specifically alters the onset of lipid scrambling, but not Ca 2+ influx, thus identifying features outside of channel pore that are important for lipid scrambling. Together, our studies demonstrate that membrane distortion does not require open hydrophilic grooves facing the membrane interior and provide further evidence to suggest separate pathways for lipid scrambling and ion permeation.


    Organizational Affiliation

    Department of Physiology, University of California, San Francisco, San Francisco, CA 94158, USA; Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA; Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94158, USA.,Department of Physiology, University of California, San Francisco, San Francisco, CA 94158, USA; Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA; Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94158, USA. Electronic address: lily.jan@ucsf.edu.,Department of Physiology, University of California, San Francisco, San Francisco, CA 94158, USA.,Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA.,Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA; Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, CA 94158, USA. Electronic address: ycheng@ucsf.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Anoctamin-6
A, B
911Mus musculusMutation(s): 0 
Gene Names: Ano6 (Tmem16f)
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
TMEM16 Family Proteins
Protein: 
TMEM16F scramblase & ion channel in lipid nanodiscs, Ca+2-bound state
Find proteins for Q6P9J9 (Mus musculus)
Go to UniProtKB:  Q6P9J9
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM098672
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesR01NS069229
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesR35NS097229
National Institutes of Health/Office of the DirectorUnited StatesS10OD0020054
National Institutes of Health/Office of the DirectorUnited StatesS10OD021741
Human Frontier Science Program (HFSP)France--

Revision History 

  • Version 1.0: 2019-07-24
    Type: Initial release
  • Version 1.1: 2019-12-18
    Type: Author supporting evidence, Other