6IV0

Crystal structure of a bacterial Bestrophin homolog from Klebsiella pneumoniae with a mutation I180A

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.202 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Dual Ca2+-dependent gates in human Bestrophin1 underlie disease-causing mechanisms of gain-of-function mutations.

Ji, C., Kittredge, A., Hopiavuori, A., Ward, N., Chen, S., Fukuda, Y., Zhang, Y., Yang, T.

(2019) Commun Biol 2: 240-240

  • DOI: https://doi.org/10.1038/s42003-019-0433-3
  • Primary Citation of Related Structures:  
    6IV0, 6IV1, 6IV2, 6IV3, 6IV4, 6IVJ, 6IVK, 6IVL, 6IVM, 6IVN, 6IVO, 6IVP, 6IVQ, 6IVR, 6IVW, 6JLF

  • PubMed Abstract: 

    • Mutations of human BEST1 , encoding a Ca 2+ -activated Cl - channel (hBest1), cause macular degenerative disorders. Best1 homolog structures reveal an evolutionarily conserved channel architecture highlighted by two landmark restrictions (named the "neck" and "aperture", respectively) in the ion conducting pathway, suggesting a unique dual-switch gating mechanism, which, however, has not been characterized well ...

    Mutations of human BEST1 , encoding a Ca 2+ -activated Cl - channel (hBest1), cause macular degenerative disorders. Best1 homolog structures reveal an evolutionarily conserved channel architecture highlighted by two landmark restrictions (named the "neck" and "aperture", respectively) in the ion conducting pathway, suggesting a unique dual-switch gating mechanism, which, however, has not been characterized well. Using patch clamp and crystallography, we demonstrate that both the neck and aperture in hBest1 are Ca 2+ -dependent gates essential for preventing channel leakage resulting from Ca 2+ -independent, spontaneous gate opening. Importantly, three patient-derived mutations (D203A, I205T and Y236C) lead to Ca 2+ -independent leakage and elevated Ca 2+ -dependent anion currents due to enhanced opening of the gates. Moreover, we identify a network of residues critically involved in gate operation. Together, our results suggest an indispensable role of the neck and aperture of hBest1 for channel gating, and uncover disease-causing mechanisms of hBest1 gain-of-function mutations.

    Organizational Affiliation: 

    Department of Pharmacology and Physiology, University of Rochester, School of Medicine and Dentistry, Rochester, NY 14642 USA.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bestrophin homolog
A, B, C, D, E
296Klebsiella pneumoniae IS53Mutation(s): 1 
Membrane Entity: Yes 
UniProt
Find proteins for W1ELP7 (Klebsiella pneumoniae IS53)
Explore W1ELP7 
Go to UniProtKB:  W1ELP7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupW1ELP7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.90 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.202 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.573α = 90
b = 159.905β = 90
c = 161.261γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31770801

Revision History  (Full details and data files)

  • Version 1.0: 2019-11-13
    Type: Initial release
  • Version 1.1: 2022-06-08
    Changes: Database references, Derived calculations, Structure summary