6O7A

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

  • Classification: TRANSPORT PROTEIN
  • Organism(s): Lotus japonicus
  • Expression System: Escherichia coli

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.0 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:  

  • 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 <sup>2+ </sup> spiking. He ...

    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.,Howard Hughes Medical Institute and Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA.,Department of Bacteriology, University of Wisconsin-Madison, Madison, WI, USA.,School of Life Science and Technology, ShanghaiTech University, 201210, Shanghai, China.,Howard Hughes Medical Institute and Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA. youxing.jiang@utsouthwestern.edu.,Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA.,School of Agriculture, University of Wisconsin-Platteville, Platteville, WI, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ion channel CASTOR
A, C, B, D
554Lotus japonicusMutation(s): 0 
Gene Names: CASTOR
Find proteins for Q5H8A6 (Lotus japonicus)
Go to UniProtKB:  Q5H8A6
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.229 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 100.433α = 90.00
b = 116.015β = 113.92
c = 113.027γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
HKL-2000data collection
PHASERphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2019-03-07 
  • Released Date: 2019-09-11 
  • Deposition Author(s): Jiang, Y., Kim, S.

Funding OrganizationLocationGrant Number
Howard Hughes Medical InstituteUnited StatesY.J.
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM079179
Welch FoundationUnited StatesI-1578

Revision History 

  • Version 1.0: 2019-09-11
    Type: Initial release