6N28

BEST1 calcium-bound open state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

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

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

(2019) Elife 8: --

  • DOI: 10.7554/eLife.43231
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Bestrophin (BEST1-4) ligand-gated chloride (Cl <sup>- </sup>) channels are activated by calcium (Ca <sup>2+ </sup>). Mutation of BEST1 causes retinal disease. Partly because bestrophin channels have no sequence or structural similarity to other ion c ...

    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.,Louis V. Gerstner Jr. Graduate School of Biomedical Sciences, Memorial Sloan Kettering Cancer Center, New York, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Bestrophin homolog
A, B, C, D, E
348Gallus gallusMutation(s): 0 
Gene Names: BEST1
Find proteins for E1C3A0 (Gallus gallus)
Go to Gene View: BEST1
Go to UniProtKB:  E1C3A0
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B, C, D, E
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.9 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM110396
National Institutes of Health/National Cancer InstituteUnited StatesP30 CA008748

Revision History 

  • Version 1.0: 2019-01-23
    Type: Initial release