4YZD

Crystal Structure of human phosphorylated IRE1alpha in complex with ADP-Mg


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.102 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Long-Range Inhibitor-Induced Conformational Regulation of Human IRE1 alpha Endoribonuclease Activity.

Concha, N.O.Smallwood, A.Bonnette, W.Totoritis, R.Zhang, G.Federowicz, K.Yang, J.Qi, H.Chen, S.Campobasso, N.Choudhry, A.E.Shuster, L.E.Evans, K.A.Ralph, J.Sweitzer, S.Heerding, D.A.Buser, C.A.Su, D.S.DeYoung, M.P.

(2015) Mol.Pharmacol. 88: 1011-1023

  • DOI: 10.1124/mol.115.100917
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Activation of the inositol-requiring enzyme-1 alpha (IRE1α) protein caused by endoplasmic reticulum stress results in the homodimerization of the N-terminal endoplasmic reticulum luminal domains, autophosphorylation of the cytoplasmic kinase domains, ...

    Activation of the inositol-requiring enzyme-1 alpha (IRE1α) protein caused by endoplasmic reticulum stress results in the homodimerization of the N-terminal endoplasmic reticulum luminal domains, autophosphorylation of the cytoplasmic kinase domains, and conformational changes to the cytoplasmic endoribonuclease (RNase) domains, which render them functional and can lead to the splicing of X-box binding protein 1 (XBP 1) mRNA. Herein, we report the first crystal structures of the cytoplasmic portion of a human phosphorylated IRE1α dimer in complex with (R)-2-(3,4-dichlorobenzyl)-N-(4-methylbenzyl)-2,7-diazaspiro(4.5)decane-7-carboxamide, a novel, IRE1α-selective kinase inhibitor, and staurosporine, a broad spectrum kinase inhibitor. (R)-2-(3,4-dichlorobenzyl)-N-(4-methylbenzyl)-2,7-diazaspiro(4.5)decane-7-carboxamide inhibits both the kinase and RNase activities of IRE1α. The inhibitor interacts with the catalytic residues Lys599 and Glu612 and displaces the kinase activation loop to the DFG-out conformation. Inactivation of IRE1α RNase activity appears to be caused by a conformational change, whereby the αC helix is displaced, resulting in the rearrangement of the kinase domain-dimer interface and a rotation of the RNase domains away from each other. In contrast, staurosporine binds at the ATP-binding site of IRE1α, resulting in a dimer consistent with RNase active yeast Ire1 dimers. Activation of IRE1α RNase activity appears to be promoted by a network of hydrogen bond interactions between highly conserved residues across the RNase dimer interface that place key catalytic residues poised for reaction. These data implicate that the intermolecular interactions between conserved residues in the RNase domain are required for activity, and that the disruption of these interactions can be achieved pharmacologically by small molecule kinase domain inhibitors.


    Organizational Affiliation

    Oncology R&D (K.F., J.Y., L.E.S., K.A.E., J.R., D.A.H., C.A.B., D.S.S, M.P.D.), Biological Sciences (R.T., G.Z., H.Q., S.C., A.E.C., S.S.), and Chemical Sciences, GlaxoSmithKline Research and Development, Collegeville, Pennsylvania (N.O.C., A.S., W.B., N.C.) maurice.p.deyoung@gsk.com Nestor.O.Concha@gsk.com.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase/endoribonuclease IRE1
A, B, C
405Homo sapiensMutation(s): 0 
Gene Names: ERN1 (IRE1)
Find proteins for O75460 (Homo sapiens)
Go to Gene View: ERN1
Go to UniProtKB:  O75460
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
A, B, C
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.102 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.232 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 191.751α = 90.00
b = 122.492β = 107.07
c = 77.876γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
SCALEPACKdata scaling
Cootmodel building
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2015-03-24 
  • Released Date: 2015-11-11 
  • Deposition Author(s): Concha, N.O.

Revision History 

  • Version 1.0: 2015-11-11
    Type: Initial release