6O7A

Crystal structure of the LjCASTOR gating ring in the Ca2+-free state

  • Classification: TRANSPORT PROTEIN
  • Organism(s): Lotus japonicus
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2019-03-07 Released: 2019-09-11 
  • Deposition Author(s): Jiang, Y., Kim, S.
  • Funding Organization(s): Howard Hughes Medical Institute (HHMI), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), Welch Foundation

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.232 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Ca2+-regulated Ca2+channels with an RCK gating ring control plant symbiotic associations.

Kim, S.Zeng, W.Bernard, S.Liao, J.Venkateshwaran, M.Ane, J.M.Jiang, Y.

(2019) Nat Commun 10: 3703-3703

  • DOI: 10.1038/s41467-019-11698-5
  • Primary Citation of Related Structures:  
    6O6J, 6O7A, 6O7C

  • PubMed Abstract: 
  • A family of plant nuclear ion channels, including DMI1 (Does not Make Infections 1) and its homologs CASTOR and POLLUX, are required for the establishment of legume-microbe symbioses by generating nuclear and perinuclear Ca 2+ spiking. Here we show that CASTOR from Lotus japonicus is a highly selective Ca 2+ channel whose activation requires cytosolic/nucleosolic Ca 2+ , contrary to the previous suggestion of it being a K + channel ...

    A family of plant nuclear ion channels, including DMI1 (Does not Make Infections 1) and its homologs CASTOR and POLLUX, are required for the establishment of legume-microbe symbioses by generating nuclear and perinuclear Ca 2+ spiking. Here we show that CASTOR from Lotus japonicus is a highly selective Ca 2+ channel whose activation requires cytosolic/nucleosolic Ca 2+ , contrary to the previous suggestion of it being a K + channel. Structurally, the cytosolic/nucleosolic ligand-binding soluble region of CASTOR contains two tandem RCK (Regulator of Conductance for K + ) domains, and four subunits assemble into the gating ring architecture, similar to that of large conductance, Ca 2+ -gated K + (BK) channels despite the lack of sequence similarity. Multiple ion binding sites are clustered at two locations within each subunit, and three of them are identified to be Ca 2+ sites. Our in vitro and in vivo assays also demonstrate the importance of these gating-ring Ca 2+ binding sites to the physiological function of CASTOR as well as DMI1.


    Organizational Affiliation

    Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA. youxing.jiang@utsouthwestern.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ion channel CASTORA,
C [auth B],
B [auth C],
D
554Lotus japonicusMutation(s): 0 
Gene Names: CASTOR
UniProt
Find proteins for Q5H8A6 (Lotus japonicus)
Explore Q5H8A6 
Go to UniProtKB:  Q5H8A6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5H8A6
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.232 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.433α = 90
b = 116.015β = 113.92
c = 113.027γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United StatesY.J.
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM079179
Welch FoundationUnited StatesI-1578

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-11
    Type: Initial release
  • Version 1.1: 2019-11-20
    Changes: Author supporting evidence