5NL2 image
Entry Detail
PDB ID:
5NL2
EMDB ID:
Title:
cryo-EM structure of the mTMEM16A ion channel at 6.6 A resolution.
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2017-04-03
Release Date:
2017-06-07
Method Details:
Experimental Method:
Resolution:
6.60 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Anoctamin-1
Chain IDs:A, B
Chain Length:960
Number of Molecules:2
Biological Source:Mus musculus
Ligand Molecules
Primary Citation
Structural basis for anion conduction in the calcium-activated chloride channel TMEM16A.
Elife 6 ? ? (2017)
PMID: 28561733 DOI: 10.7554/eLife.26232

Abstact

The calcium-activated chloride channel TMEM16A is a member of a conserved protein family that comprises ion channels and lipid scramblases. Although the structure of the scramblase nhTMEM16 has defined the architecture of the family, it was unknown how a channel has adapted to cope with its distinct functional properties. Here we have addressed this question by the structure determination of mouse TMEM16A by cryo-electron microscopy and a complementary functional characterization. The protein shows a similar organization to nhTMEM16, except for changes at the site of catalysis. There, the conformation of transmembrane helices constituting a membrane-spanning furrow that provides a path for lipids in scramblases has changed to form an enclosed aqueous pore that is largely shielded from the membrane. Our study thus reveals the structural basis of anion conduction in a TMEM16 channel and it defines the foundation for the diverse functional behavior in the TMEM16 family.

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Primary Citation of related structures