Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 27513.33 
• Atom Count: 1711 
• Residue Count: 246 
• Unique protein chains: 1

1XZZ

Crystal structure of the ligand binding suppressor domain of type 1 inositol 1,4,5-trisphosphate receptor

• DOI: 10.2210/pdb1XZZ/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Mus musculus
• Expression System: Escherichia coli


• Deposited: 2004-11-13 Released: 2005-01-25 
• Deposition Author(s): Bosanac, I., Yamazaki, H., Matsu-ura, T., Michikawa, T., Mikoshiba, K., Ikura, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.238 
• R-Value Work: 0.205 

Literature

Crystal structure of the ligand binding suppressor domain of type 1 inositol 1,4,5-trisphosphate receptor.

Bosanac, I., Yamazaki, H., Matsu-Ura, T., Michikawa, T., Mikoshiba, K., Ikura, M.

(2005) Mol.Cell 17: 193-203

• PubMed: 15664189 
• DOI: 10.1016/j.molcel.2004.11.047


• PubMed Abstract: 
  

Binding of inositol 1,4,5-trisphosphate (IP(3)) to the amino-terminal region of IP(3) receptor promotes Ca(2+) release from the endoplasmic reticulum. Within the amino terminus, the first 220 residues directly preceding the IP(3) binding core domain play a key role in IP(3) binding suppression and regulatory protein interaction. Here we present a crystal structure of the suppressor domain of the mouse type 1 IP(3) receptor at 1.8 A. Displaying a shape akin to a hammer, the suppressor region contains a Head subdomain forming the beta-trefoil fold and an Arm subdomain possessing a helix-turn-helix structure. The conserved region on the Head subdomain appeared to interact with the IP(3) binding core domain and is in close proximity to the previously proposed binding sites of Homer, RACK1, calmodulin, and CaBP1. The present study sheds light onto the mechanism underlying the receptor's sensitivity to the ligand and its communication with cellular signaling proteins.

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Organizational Affiliation: 

Division of Molecular and Structural Biology, Ontario Cancer Institute and Department of Medical Biophysics, University of Toronto, 610 University Avenue, Toronto, Ontario, M5G 2M9, Canada.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Inositol 1,4,5-trisphosphate receptor type 1	A	246	Mus musculus	Mutation(s): 0  Gene Names: Itpr1 (Insp3r, Pcd6, Pcp1)
Find proteins for P11881 (Mus musculus) Go to UniProtKB:  P11881

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
GOL	A	GLYCEROL GLYCERIN; PROPANE-1,2,3-TRIOL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.238 
• R-Value Work: 0.205 
• Space Group: H 3 2

Unit Cell:

Length (Å)	Angle (°)
a = 147.300	α = 90.00
b = 147.300	β = 90.00
c = 65.000	γ = 120.00

Software Package:

Software Name	Purpose
SOLVE	phasing
CNS	refinement
HKL-2000	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-11-13 
• Released Date: 2005-01-25 
• Deposition Author(s): Bosanac, I., Yamazaki, H., Matsu-ura, T., Michikawa, T., Mikoshiba, K., Ikura, M.

Revision History 

• Version 1.0: 2005-01-25
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Non-polymer description, Version format compliance