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Title: Development of Glucose Regulated Protein 94-Selective Inhibitors Based on the BnIm and Radamide Scaffold

Journal Article · · Journal of Medicinal Chemistry

Glucose regulated protein 94 (Grp94) is the endoplasmic reticulum resident of the heat shock protein 90 kDa (Hsp90) family of molecular chaperones. Grp94 associates with many proteins involved in cell adhesion and signaling, including integrins, Toll-like receptors, immunoglobulins, and mutant myocilin. Grp94 has been implicated as a target for several therapeutic areas including glaucoma, cancer metastasis, and multiple myeloma. While 85% identical to other Hsp90 isoforms, the N-terminal ATP-binding site of Grp94 possesses a unique hydrophobic pocket that was used to design isoform-selective inhibitors. Incorporation of a cis-amide bioisostere into the radamide scaffold led to development of the original Grp94-selective inhibitor, BnIm. Structure–activity relationship studies have now been performed on the aryl side chain of BnIm, which resulted in improved analogues that exhibit better potency and selectivity for Grp94. Furthermore, these analogues also manifest superior antimigratory activity in a metastasis model as well as enhanced mutant myocilin degradation in a glaucoma model compared to BnIm.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institutes of Health (NIH); National Science Foundation (NSF)
Grant/Contract Number:
CA109265; EY024232; EY021205; S10OD016360; S10RR024664; 0320648
OSTI ID:
1251219
Journal Information:
Journal of Medicinal Chemistry, Vol. 59, Issue 7; ISSN 0022-2623
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 48 works
Citation information provided by
Web of Science

References (51)

Structure, Function and Regulation of the Hsp90 Machinery journal January 2013
Hsp90: Still a viable target in prostate cancer journal April 2013
Essential roles of grp94 in gut homeostasis via chaperoning canonical Wnt pathway journal April 2013
Glucose-regulated Protein 94 Triage of Mutant Myocilin through Endoplasmic Reticulum-associated Degradation Subverts a More Efficient Autophagic Clearance Mechanism journal October 2012
Molecular Chaperone gp96 Is a Novel Therapeutic Target of Multiple Myeloma journal September 2013
Synthesis and Evaluation of Novologues as C-Terminal Hsp90 Inhibitors with Cytoprotective Activity against Sensory Neuron Glucotoxicity journal June 2012
Alternative approaches to Hsp90 modulation for the treatment of cancer journal September 2014
The Therapeutic Target Hsp90 and Cancer Hallmarks journal January 2013
Hallmarks of Cancer: The Next Generation journal March 2011
Geldanamycin and its derivatives as Hsp90 inhibitors journal January 2012
Natural Product Inspired N-Terminal Hsp90 Inhibitors: From Bench to Bedside?: N-TERMINAL HSP90 INHIBITORS journal May 2015
Progress in the Discovery and Development of Heat Shock Protein 90 (Hsp90) Inhibitors: Miniperspective journal August 2014
Advances in the clinical development of heat shock protein 90 (Hsp90) inhibitors in cancers journal March 2012
Ganetespib (STA-9090), a Nongeldanamycin HSP90 Inhibitor, Has Potent Antitumor Activity in In Vitro and In Vivo Models of Non–Small Cell Lung Cancer journal July 2012
The HSP90 Inhibitor NVP-AUY922 Potently Inhibits Non–Small Cell Lung Cancer Growth journal March 2013
The hERG Channel Is Dependent upon the Hsp90α Isoform for Maturation and Trafficking journal May 2012
The HSP90 family of genes in the human genome: Insights into their divergence and evolution journal December 2005
Experimental and Structural Testing Module to Analyze Paralogue-Specificity and Affinity in the Hsp90 Inhibitors Series journal August 2013
Identification of a Protein with Homology to hsp90 That Binds the Type 1 Tumor Necrosis Factor Receptor journal February 1995
Glucose-regulated proteins in cancer: molecular mechanisms and therapeutic potential journal March 2014
Exploiting the interaction between Grp94 and aggregated myocilin to treat glaucoma journal July 2014
Structure of the N-terminal Domain of GRP94: BASIS FOR LIGAND SPECIFICITY AND REGULATION journal September 2003
GRP94: An HSP90-like protein specialized for protein folding and quality control in the endoplasmic reticulum journal March 2012
Targeting the ER-autophagy system in the trabecular meshwork to treat glaucoma journal March 2016
Proteomic Plasma Membrane Profiling Reveals an Essential Role for gp96 in the Cell Surface Expression of LDLR Family Members, Including the LDL Receptor and LRP6 journal January 2012
Paralog-selective Hsp90 inhibitors define tumor-specific regulation of HER2 journal September 2013
Structure–Activity Relationship in a Purine-Scaffold Compound Series with Selectivity for the Endoplasmic Reticulum Hsp90 Paralog Grp94 journal April 2015
Development of a Grp94 inhibitor journal May 2012
Development of radamide analogs as Grp94 inhibitors journal August 2014
Ligand Interactions in the Adenosine Nucleotide-binding Domain of the Hsp90 Chaperone, GRP94: I. EVIDENCE FOR ALLOSTERIC REGULATION OF LIGAND BINDING journal May 2000
Ligand-induced Conformational Shift in the N-terminal Domain of GRP94, an Hsp90 Chaperone journal August 2004
Ligand Interactions in the Adenosine Nucleotide-binding Domain of the Hsp90 Chaperone, GRP94: II. LIGAND-MEDIATED ACTIVATION OF GRP94 MOLECULAR CHAPERONE AND PEPTIDE BINDING ACTIVITY journal May 2000
Different Poses for Ligand and Chaperone in Inhibitor-Bound Hsp90 and GRP94: Implications for Paralog-Specific Drug Design journal May 2009
Lacosamide Isothiocyanate-Based Agents: Novel Agents To Target and Identify Lacosamide Receptors journal October 2009
Design, Synthesis, and Evaluation of a Radicicol and Geldanamycin Chimera, Radamide journal November 2004
Synthesis and Evaluation of Radamide Analogues, A Chimera of Radicicol and Geldanamycin journal June 2009
Structural Basis of Integrin Regulation and Signaling journal April 2007
Alpha2beta1 integrin in cancer development and chemoresistance journal December 2015
The Molecular Chaperone gp96/GRP94 Interacts with Toll-like Receptors and Integrins via Its C-terminal Hydrophobic Domain journal February 2012
Integrin α2β1 Mediates Tyrosine Phosphorylation of Vascular Endothelial Cadherin Induced by Invasive Breast Cancer Cells journal September 2012
Overexpression of GRP94 in breast cancer cells resistant to oxidative stress promotes high levels of cancer cell proliferation and migration: Implications for tumor recurrence journal March 2012
Endoplasmic Reticulum-resident Heat Shock Protein 90 (HSP90) Isoform Glucose-regulated Protein 94 (GRP94) Regulates Cell Polarity and Cancer Cell Migration by Affecting Intracellular Transport journal April 2016
Discovery of Molecular Therapeutics for Glaucoma: Challenges, Successes, and Promising Directions: Miniperspective journal September 2015
The Glaucoma-Associated Olfactomedin Domain of Myocilin Forms Polymorphic Fibrils That Are Constrained by Partial Unfolding and Peptide Sequence journal February 2014
A high-affinity conformation of Hsp90 confers tumour selectivity on Hsp90 inhibitors journal September 2003
Structures of GRP94-Nucleotide Complexes Reveal Mechanistic Differences between the hsp90 Chaperones journal October 2007
Expression and Purification of Soluble His6-Tagged TEV Protease book January 2009
XDS journal January 2010
Phaser crystallographic software journal July 2007
Features and development of Coot journal March 2010
PRODRG : a tool for high-throughput crystallography of protein–ligand complexes journal July 2004

Cited By (6)

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Different Grp94 components interact transiently with the myocilin olfactomedin domain in vitro to enhance or retard its amyloid aggregation journal September 2019
NECA derivatives exploit the paralog-specific properties of the site 3 side pocket of Grp94, the endoplasmic reticulum Hsp90 journal September 2019
Proteomic interrogation of HSP90 and insights for medical research journal October 2017
Structure-guided design of an Hsp90β N-terminal isoform-selective inhibitor journal January 2018
Isoform-selective Hsp90 inhibition rescues model of hereditary open-angle glaucoma journal December 2017