3NMQ

Hsp90b N-terminal domain in complex with EC44, a pyrrolo-pyrimidine methoxypyridine inhibitor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

EC144, a Synthetic Inhibitor of Heat Shock Protein 90, Blocks Innate and Adaptive Immune Responses in Models of Inflammation and Autoimmunity.

Yun, T.J.Harning, E.K.Giza, K.Rabah, D.Li, P.Arndt, J.W.Luchetti, D.Biamonte, M.A.Shi, J.Lundgren, K.Manning, A.Kehry, M.R.

(2011) J.Immunol. 186: 563-575

  • DOI: 10.4049/jimmunol.1000222

  • PubMed Abstract: 
  • Heat shock protein 90 (Hsp90) is a molecular chaperone involved in folding and stabilizing multiple intracellular proteins that have roles in cell activation and proliferation. Many Hsp90 client proteins in tumor cells are mutated or overexpressed on ...

    Heat shock protein 90 (Hsp90) is a molecular chaperone involved in folding and stabilizing multiple intracellular proteins that have roles in cell activation and proliferation. Many Hsp90 client proteins in tumor cells are mutated or overexpressed oncogenic proteins driving cancer cell growth, leading to the acceptance of Hsp90 as a potential therapeutic target for cancer. Because several signal transduction molecules that are dependent on Hsp90 function are also involved in activation of innate and adaptive cells of the immune system, we investigated the mechanism by which inhibiting Hsp90 leads to therapeutic efficacy in rodent models of inflammation and autoimmunity. EC144, a synthetic Hsp90 inhibitor, blocked LPS-induced TLR4 signaling in RAW 264.7 cells by inhibiting activation of ERK1/2, MEK1/2, JNK, and p38 MAPK but not NF-κB. Ex vivo LPS-stimulated CD11b(+) peritoneal exudate cells from EC144-treated mice were blocked from phosphorylating tumor progression locus 2, MEK1/2, and ERK1/2. Consequently, EC144-treated mice were resistant to LPS administration and had suppressed systemic TNF-α release. Inhibiting Hsp90 also blocked in vitro CD4(+) T cell proliferation in mouse and human MLRs. In vivo, semitherapeutic administration of EC144 blocked disease development in rat collagen-induced arthritis by suppressing the inflammatory response. In a mouse collagen-induced arthritis model, EC144 also suppressed disease development, which correlated with a suppressed Ag-specific Ab response and a block in activation of Ag-specific CD4(+) T cells. Our results describe mechanisms by which blocking Hsp90 function may be applicable to treatment of autoimmune diseases involving inflammation and activation of the adaptive immune response.


    Organizational Affiliation

    Department of Immunobiology, Biogen Idec, San Diego, CA 92122, USA. ted.yun@biogenidec.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heat shock protein HSP 90-beta
A
239Homo sapiensMutation(s): 0 
Gene Names: HSP90AB1 (HSP90B, HSPC2, HSPCB)
Find proteins for P08238 (Homo sapiens)
Go to Gene View: HSP90AB1
Go to UniProtKB:  P08238
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
7PP
Query on 7PP

Download SDF File 
Download CCD File 
A
5-{2-amino-4-chloro-7-[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]-7H-pyrrolo[2,3-d]pyrimidin-5-yl}-2-methylpent-4-yn-2-ol
EC44
C21 H24 Cl N5 O2
VOASEWXFCTZRDF-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
7PPIC50: 1.1 nM (89) BINDINGDB
7PPKi: 0.2 nM (89) BINDINGDB
7PPEC50: 14 nM (89) BINDINGDB
7PPKi: 0.2 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.199 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 66.515α = 90.00
b = 90.048β = 90.00
c = 95.182γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
MOLREPphasing
HKL-2000data scaling
CrystalCleardata collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-12-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance