Crystal Structure of human TMEM16K / Anoctamin 10

Experimental Data Snapshot

  • Resolution: 3.20 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.229 

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Ligand Structure Quality Assessment 

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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: https://doi.org/10.1038/s41467-019-11753-1
  • Primary Citation of Related Structures:  
    5OC9, 6R65, 6R7X, 6R7Y, 6R7Z

  • 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. 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
667Homo sapiensMutation(s): 0 
Gene Names: ANO10TMEM16K
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NW15 (Homo sapiens)
Explore Q9NW15 
Go to UniProtKB:  Q9NW15
GTEx:  ENSG00000160746 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NW15
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 79M

Download Ideal Coordinates CCD File 
AA [auth B]
F [auth A]
G [auth A]
H [auth A]
I [auth A]
AA [auth B],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
(2R)-2,3-dihydroxypropyl (7Z)-hexadec-7-enoate
C19 H36 O4
Query on CA

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
O [auth B]
P [auth B]
C [auth A],
D [auth A],
E [auth A],
O [auth B],
P [auth B],
Q [auth B],
R [auth B]
Experimental Data & Validation

Experimental Data

  • Resolution: 3.20 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.229 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.15α = 90
b = 153.59β = 90
c = 218.78γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2018-07-25
    Type: Initial release
  • Version 1.1: 2019-06-12
    Changes: Data collection, Structure summary
  • Version 1.2: 2019-11-20
    Changes: Database references
  • Version 1.3: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description