6E1O

afTMEM16 reconstituted in nanodiscs in the presence of Ca2+ and ceramide 24:0


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.59 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

Structural basis of Ca2+-dependent activation and lipid transport by a TMEM16 scramblase.

Falzone, M.E.Rheinberger, J.Lee, B.C.Peyear, T.Sasset, L.Raczkowski, A.M.Eng, E.T.Di Lorenzo, A.Andersen, O.S.Nimigean, C.M.Accardi, A.

(2019) Elife 8: --

  • DOI: 10.7554/eLife.43229
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The lipid distribution of plasma membranes of eukaryotic cells is asymmetric and phospholipid scramblases disrupt this asymmetry by mediating the rapid, nonselective transport of lipids down their concentration gradients. As a result, phosphatidylser ...

    The lipid distribution of plasma membranes of eukaryotic cells is asymmetric and phospholipid scramblases disrupt this asymmetry by mediating the rapid, nonselective transport of lipids down their concentration gradients. As a result, phosphatidylserine is exposed to the outer leaflet of membrane, an important step in extracellular signaling networks controlling processes such as apoptosis, blood coagulation, membrane fusion and repair. Several TMEM16 family members have been identified as Ca 2+ -activated scramblases, but the mechanisms underlying their Ca 2+ -dependent gating and their effects on the surrounding lipid bilayer remain poorly understood. Here, we describe three high-resolution cryo-electron microscopy structures of a fungal scramblase from Aspergillus fumigatus , afTMEM16, reconstituted in lipid nanodiscs. These structures reveal that Ca 2+ -dependent activation of the scramblase entails global rearrangement of the transmembrane and cytosolic domains. These structures, together with functional experiments, suggest that activation of the protein thins the membrane near the transport pathway to facilitate rapid transbilayer lipid movement.


    Organizational Affiliation

    Department of Pathology, Weill Cornell Medical College, New York, United States.,Department of Physiology and Biophysics, Weill Cornell Medical College, New York, United States.,Department of Structure and Function on Neural Network, Korea Brain Research Institute, Deagu, Republic of Korea.,Simons Electron Microscopy Center, New York Structural Biology Center, New York, United States.,Department of Anesthesiology, Weill Cornell Medical College, New York, United States.,Department of Biochemistry, Weill Cornell Medical College, New York, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Plasma membrane channel protein (Aqy1), putative
B, A
735Neosartorya fumigata (strain ATCC MYA-4609 / Af293 / CBS 101355 / FGSC A1100)Mutation(s): 0 
Find proteins for Q4WA18 (Neosartorya fumigata (strain ATCC MYA-4609 / Af293 / CBS 101355 / FGSC A1100))
Go to UniProtKB:  Q4WA18
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
D12
Query on D12

Download SDF File 
Download CCD File 
A, B
DODECANE
C12 H26
SNRUBQQJIBEYMU-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
8K6
Query on 8K6

Download SDF File 
Download CCD File 
A, B
Octadecane
N-Octadecane
C18 H38
RZJRJXONCZWCBN-UHFFFAOYSA-N
 Ligand Interaction
D10
Query on D10

Download SDF File 
Download CCD File 
A, B
DECANE
C10 H22
DIOQZVSQGTUSAI-UHFFFAOYSA-N
 Ligand Interaction
HEX
Query on HEX

Download SDF File 
Download CCD File 
A, B
HEXANE
C6 H14
VLKZOEOYAKHREP-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.59 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
Software Package:
Software NamePurpose
phenix.real_space_refinerefinement
PHENIXrefinement

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 States5R01GM106717

Revision History 

  • Version 1.0: 2019-02-06
    Type: Initial release
  • Version 1.1: 2019-12-18
    Type: Author supporting evidence, Other