Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 160.75 kDa 
• Atom Count: 10138 
• Residue Count: 1223 
• Unique protein chains: 1

5OC9

Crystal Structure of human TMEM16K / Anoctamin 10

• DOI: 10.2210/pdb5OC9/pdb

• Classification: LIPID TRANSPORT
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2017-06-29 Released: 2018-07-25 
• Deposition Author(s): Bushell, S.R., Pike, A.C.W., Chu, A., Tessitore, A., Rotty, B., Mukhopadhyay, S., Kupinska, K., Shrestha, L., Borkowska, O., Chalk, R., Burgess-Brown, N.A., Love, J., Edwards, A.M., Arrowsmith, C.H., Bountra, C., Carpenter, E.P., Structural Genomics Consortium (SGC)
• Funding Organization(s): Wellcome Trust

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.20 Å
• R-Value Free: 0.245 
• R-Value Work: 0.228 
• R-Value Observed: 0.229 

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

• PubMed: 31477691 
• DOI: 10.1038/s41467-019-11753-1
• Primary Citation of Related Structures:  
  5OC9, 6R65, 6R7X, 6R7Z, 6R7Y


• 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.

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Organizational Affiliation: 

Structural Genomics Consortium, Nuffield Department of Medicine, University of Oxford, Old Road Campus Research Building, Roosevelt Drive, Oxford, OX3 7DQ, UK. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Anoctamin-10	A, B	667	Homo sapiens	Mutation(s): 0  Gene Names: ANO10, TMEM16K
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 GTEx:  ENSG00000160746

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
79M	A, B	(2R)-2,3-dihydroxypropyl (7Z)-hexadec-7-enoate C19 H36 O4 OWGMAJRKMYGYBQ-HJCTWCACSA-N
CA	A, B	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• 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 = 59.15	α = 90
b = 153.59	β = 90
c = 218.78	γ = 90

Software Package:

Software Name	Purpose
BUSTER	refinement
XDS	data reduction
Aimless	data scaling
MrBUMP	phasing
MR-Rosetta	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-06-29 
• Released Date: 2018-07-25 
Deposition Author(s): Bushell, S.R., Pike, A.C.W., Chu, A., Tessitore, A., Rotty, B., Mukhopadhyay, S., Kupinska, K., Shrestha, L., Borkowska, O., Chalk, R., Burgess-Brown, N.A., Love, J., Edwards, A.M., Arrowsmith, C.H., Bountra, C., Carpenter, E.P., Structural Genomics Consortium (SGC)

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Funding Organization	Location	Grant Number
Wellcome Trust	United Kingdom	--

Revision History 

• 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