6R7X

CryoEM structure of calcium-bound human TMEM16K / Anoctamin 10 in detergent (2mM Ca2+, closed form)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.47 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

The structural basis of lipid scrambling and inactivation in the endoplasmic reticulum scramblase TMEM16K.

Bushell, S.R.Pike, A.C.W.Falzone, M.E.Rorsman, N.J.G.Ta, C.M.Corey, R.A.Newport, T.D.Christianson, J.C.Scofano, L.F.Shintre, C.A.Tessitore, A.Chu, A.Wang, Q.Shrestha, L.Mukhopadhyay, S.M.M.Love, J.D.Burgess-Brown, N.A.Sitsapesan, R.Stansfeld, P.J.Huiskonen, J.T.Tammaro, P.Accardi, A.Carpenter, E.P.

(2019) Nat Commun 10: 3956-3956

  • DOI: 10.1038/s41467-019-11753-1
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Membranes in cells have defined distributions of lipids in each leaflet, controlled by lipid scramblases and flip/floppases. However, for some intracellular membranes such as the endoplasmic reticulum (ER) the scramblases have not been identified. Me ...

    Membranes in cells have defined distributions of lipids in each leaflet, controlled by lipid scramblases and flip/floppases. However, for some intracellular membranes such as the endoplasmic reticulum (ER) the scramblases have not been identified. Members of the TMEM16 family have either lipid scramblase or chloride channel activity. Although TMEM16K is widely distributed and associated with the neurological disorder autosomal recessive spinocerebellar ataxia type 10 (SCAR10), its location in cells, function and structure are largely uncharacterised. Here we show that TMEM16K is an ER-resident lipid scramblase with a requirement for short chain lipids and calcium for robust activity. Crystal structures of TMEM16K show a scramblase fold, with an open lipid transporting groove. Additional cryo-EM structures reveal extensive conformational changes from the cytoplasmic to the ER side of the membrane, giving a state with a closed lipid permeation pathway. Molecular dynamics simulations showed that the open-groove conformation is necessary for scramblase activity.


    Organizational Affiliation

    Structural Genomics Consortium, Nuffield Department of Medicine, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, OX3 7DQ, UK. liz.carpenter@sgc.ox.ac.uk.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Anoctamin-10A, B667Homo sapiensMutation(s): 0 
Gene Names: ANO10TMEM16K
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
TMEM16 Family Proteins
Protein: 
TMEM16K scramblase & ion channel in detergent, 2 mM Ca2+ closed form
Find proteins for Q9NW15 (Homo sapiens)
Explore Q9NW15 
Go to UniProtKB:  Q9NW15
NIH Common Fund Data Resources
PHAROS  Q9NW15
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PC1
Query on PC1

Download CCD File 
A, B
1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE
C44 H88 N O8 P
NRJAVPSFFCBXDT-HUESYALOSA-N
 Ligand Interaction
UMQ
Query on UMQ

Download CCD File 
A, B
UNDECYL-MALTOSIDE
C23 H44 O11
UYEMNFYVTFDKRG-ZNGNCRBCSA-N
 Ligand Interaction
CA
Query on CA

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

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.47 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom106169/Z/14/Z
European CommissionUnited Kingdom115766

Revision History 

  • Version 1.0: 2019-05-01
    Type: Initial release
  • Version 1.1: 2019-09-11
    Changes: Data collection, Database references
  • Version 1.2: 2019-09-18
    Changes: Data collection, Database references
  • Version 1.3: 2019-11-20
    Changes: Database references
  • Version 1.4: 2019-12-18
    Changes: Other