Crystal structure of the lipid scramblase nhTMEM16 in crystal form 1

Experimental Data Snapshot

  • Resolution: 3.30 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.240 

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X-ray structure of a calcium-activated TMEM16 lipid scramblase.

Brunner, J.D.Lim, N.K.Schenck, S.Duerst, A.Dutzler, R.

(2014) Nature 516: 207-212

  • DOI: https://doi.org/10.1038/nature13984
  • Primary Citation of Related Structures:  
    4WIS, 4WIT

  • PubMed Abstract: 

    The TMEM16 family of proteins, also known as anoctamins, features a remarkable functional diversity. This family contains the long sought-after Ca(2+)-activated chloride channels as well as lipid scramblases and cation channels. Here we present the crystal structure of a TMEM16 family member from the fungus Nectria haematococca that operates as a Ca(2+)-activated lipid scramblase. Each subunit of the homodimeric protein contains ten transmembrane helices and a hydrophilic membrane-traversing cavity that is exposed to the lipid bilayer as a potential site of catalysis. This cavity harbours a conserved Ca(2+)-binding site located within the hydrophobic core of the membrane. Mutations of residues involved in Ca(2+) coordination affect both lipid scrambling in N. haematococca TMEM16 and ion conduction in the Cl(-) channel TMEM16A. The structure reveals the general architecture of the family and its mode of Ca(2+) activation. It also provides insight into potential scrambling mechanisms and serves as a framework to unravel the conduction of ions in certain TMEM16 proteins.

  • Organizational Affiliation

    Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
lipid scramblase
A, B
735Fusarium vanettenii 77-13-4Mutation(s): 0 
Gene Names: NECHADRAFT_66456
Membrane Entity: Yes 
Find proteins for C7Z7K1 (Fusarium vanettenii (strain ATCC MYA-4622 / CBS 123669 / FGSC 9596 / NRRL 45880 / 77-13-4))
Explore C7Z7K1 
Go to UniProtKB:  C7Z7K1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupC7Z7K1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.30 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.237 
  • R-Value Observed: 0.240 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.48α = 90
b = 113.69β = 90
c = 235.65γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Omodel building
Cootmodel building
XSCALEdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
European Research CouncilSwitzerland339116-AnoBest

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-12
    Type: Initial release
  • Version 1.1: 2014-11-19
    Changes: Database references
  • Version 1.2: 2014-12-17
    Changes: Database references
  • Version 1.3: 2018-04-25
    Changes: Author supporting evidence, Data collection, Structure summary