BEST1 calcium-bound open state

Experimental Data Snapshot

  • Resolution: 2.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Molecular mechanisms of gating in the calcium-activated chloride channel bestrophin.

Miller, A.N.Vaisey, G.Long, S.B.

(2019) Elife 8

  • DOI: https://doi.org/10.7554/eLife.43231
  • Primary Citation of Related Structures:  
    6N23, 6N24, 6N25, 6N26, 6N27, 6N28

  • PubMed Abstract: 

    Bestrophin (BEST1-4) ligand-gated chloride (Cl - ) channels are activated by calcium (Ca 2+ ). Mutation of BEST1 causes retinal disease. Partly because bestrophin channels have no sequence or structural similarity to other ion channels, the molecular mechanisms underlying gating are unknown. Here, we present a series of cryo-electron microscopy structures of chicken BEST1, determined at 3.1 Å resolution or better, that represent the channel's principal gating states. Unlike other channels, opening of the pore is due to the repositioning of tethered pore-lining helices within a surrounding protein shell that dramatically widens a neck of the pore through a concertina of amino acid rearrangements. The neck serves as both the activation and the inactivation gate. Ca 2+ binding instigates opening of the neck through allosteric means whereas inactivation peptide binding induces closing. An aperture within the otherwise wide pore controls anion permeability. The studies define a new molecular paradigm for gating among ligand-gated ion channels.

  • Organizational Affiliation

    Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Bestrophin homolog
A, B, C, D, E
348Gallus gallusMutation(s): 0 
Gene Names: BEST1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM110396
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesP30 CA008748

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-23
    Type: Initial release
  • Version 1.1: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.2: 2019-12-18
    Changes: Other