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Title: LLY-507, a cell-active, potent, and selective inhibitor of protein-lysine methyltransferase SMYD2

Journal Article · · Journal of Biological Chemistry

SMYD2 is a lysine methyltransferase that catalyzes the monomethylation of several protein substrates including p53. SMYD2 is overexpressed in a significant percentage of esophageal squamous primary carcinomas, and that overexpression correlates with poor patient survival. However, the mechanism(s) by which SMYD2 promotes oncogenesis is not understood. A small molecule probe for SMYD2 would allow for the pharmacological dissection of this biology. In this report, we disclose LLY-507, a cell-active, potent small molecule inhibitor of SMYD2. LLY-507 is >100-fold selective for SMYD2 over a broad range of methyltransferase and non-methyltransferase targets. A 1.63-Å resolution crystal structure of SMYD2 in complex with LLY-507 shows the inhibitor binding in the substrate peptide binding pocket. LLY-507 is active in cells as measured by reduction of SMYD2-induced monomethylation of p53 Lys(370) at submicromolar concentrations. We used LLY-507 to further test other potential roles of SMYD2. Mass spectrometry-based proteomics showed that cellular global histone methylation levels were not significantly affected by SMYD2 inhibition with LLY-507, and subcellular fractionation studies indicate that SMYD2 is primarily cytoplasmic, suggesting that SMYD2 targets a very small subset of histones at specific chromatin loci and/or non-histone substrates. Breast and liver cancers were identified through in silico data mining as tumor types that display amplification and/or overexpression of SMYD2. LLY-507 inhibited the proliferation of several esophageal, liver, and breast cancer cell lines in a dose-dependent manner. As a result, these findings suggest that LLY-507 serves as a valuable chemical probe to aid in the dissection of SMYD2 function in cancer and other biological processes.

Research Organization:
UChicago, LLC., Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1347984
Journal Information:
Journal of Biological Chemistry, Vol. 290, Issue 22; ISSN 0021-9258
Publisher:
American Society for Biochemistry and Molecular BiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 88 works
Citation information provided by
Web of Science

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Smyd2 conformational changes in response to p53 binding: role of the C‐terminal domain journal May 2019
The SUV4-20 inhibitor A-196 verifies a role for epigenetics in genomic integrity journal January 2017
Meta-Analysis of Genome-Wide Association Studies for Abdominal Aortic Aneurysm Identifies Four New Disease-Specific Risk Loci journal January 2017
Small molecule inhibitors and CRISPR/Cas9 mutagenesis demonstrate that SMYD2 and SMYD3 activity are dispensable for autonomous cancer cell proliferation journal June 2018
The Promise for Histone Methyltransferase Inhibitors for Epigenetic Therapy in Clinical Oncology: A Narrative Review journal May 2020
Methyltransferase Inhibitors: Competing with, or Exploiting the Bound Cofactor journal December 2019
The repositioning of epigenetic probes/inhibitors identifies new anti-schistosomal lead compounds and chemotherapeutic targets journal November 2019
Histone lysine methyltransferases as anti-cancer targets for drug discovery journal July 2016
Histone methyltransferase SMYD2: ubiquitous regulator of disease journal August 2019
Targeting protein methylation: from chemical tools to precision medicines journal May 2019
Bisphenol A and Phthalates Modulate Peritoneal Macrophage Function in Female Mice Involving SYMD2-H3K36 Dimethylation journal March 2018
Identification of a peptide inhibitor for the histone methyltransferase WHSC1 journal May 2018
Marked for death: targeting epigenetic changes in cancer journal March 2017
Collaboration of MYC and RUNX2 in lymphoma simulates T-cell receptor signaling and attenuates p53 pathway activity journal June 2019
Dysregulation of histone methyltransferases in breast cancer - Opportunities for new targeted therapies? journal September 2016
Dysregulation of protein methyltransferases in human cancer: An emerging target class for anticancer therapy journal February 2016
Lysine methyltransferase SMYD2 promotes cyst growth in autosomal dominant polycystic kidney disease journal June 2017
Smyd2 conformational changes in response to p53 binding: role of the C-terminal domain. text January 2019
ERK-Induced Activation of TCF Family of SRF Cofactors Initiates a Chromatin Modification Cascade Associated with Transcription journal March 2017
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Discovery and Characterization of a Highly Potent and Selective Aminopyrazoline-Based in Vivo Probe (BAY-598) for the Protein Lysine Methyltransferase SMYD2 journal May 2016
Understanding AAA Pathobiology journal January 2017
Inhibition of SMYD2 suppresses tumor progression by down-regulating microRNA-125b and attenuates multi-drug resistance in renal cell carcinoma journal January 2019