5H36

Crystal structures of the TRIC trimeric intracellular cation channel orthologue from Rhodobacter sphaeroides


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.409 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.247 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Crystal structures of the TRIC trimeric intracellular cation channel orthologues

Kasuya, G.Hiraizumi, M.Maturana, A.D.Kumazaki, K.Fujiwara, Y.Liu, K.Nakada-Nakura, Y.Iwata, S.Tsukada, K.Komori, T.Uemura, S.Goto, Y.Nakane, T.Takemoto, M.Kato, H.E.Yamashita, K.Wada, M.Ito, K.Ishitani, R.Hattori, M.Nureki, O.

(2016) Cell Res. 26: 1288-1301

  • DOI: 10.1038/cr.2016.140
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Ca2+ release from the sarcoplasmic reticulum (SR) and endoplasmic reticulum (ER) is crucial for muscle contraction, cell growth, apoptosis, learning and memory. The trimeric intracellular cation (TRIC) channels were recently identified as cation chan ...

    Ca2+ release from the sarcoplasmic reticulum (SR) and endoplasmic reticulum (ER) is crucial for muscle contraction, cell growth, apoptosis, learning and memory. The trimeric intracellular cation (TRIC) channels were recently identified as cation channels balancing the SR and ER membrane potentials, and are implicated in Ca2+ signaling and homeostasis. Here we present the crystal structures of prokaryotic TRIC channels in the closed state and structure-based functional analyses of prokaryotic and eukaryotic TRIC channels. Each trimer subunit consists of seven transmembrane (TM) helices with two inverted repeated regions. The electrophysiological, biochemical and biophysical analyses revealed that TRIC channels possess an ion-conducting pore within each subunit, and that the trimer formation contributes to the stability of the protein. The symmetrically related TM2 and TM5 helices are kinked at the conserved glycine clusters, and these kinks are important for the channel activity. Furthermore, the kinks of the TM2 and TM5 helices generate lateral fenestrations at each subunit interface. Unexpectedly, these lateral fenestrations are occupied with lipid molecules. This study provides the structural and functional framework for the molecular mechanism of this ion channel superfamily.


    Organizational Affiliation

    Department of Biological Sciences, Graduate School of Science, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uncharacterized protein TRIC
E, A
215Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158)Mutation(s): 0 
Find proteins for Q3HKN0 (Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158))
Go to UniProtKB:  Q3HKN0
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PX4
Query on PX4

Download SDF File 
Download CCD File 
A, E
1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE
C36 H73 N O8 P
CITHEXJVPOWHKC-UUWRZZSWSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.409 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.247 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 156.010α = 90.00
b = 156.010β = 90.00
c = 82.370γ = 120.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
SHELXDphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-01-11
    Type: Initial release