Cited by 131Chemical Synthesis and AnalysisCancer-related Molecular PathwaysProtein Degradation and Inhibitors

Stabilization of the Max Homodimer with a Small Molecule Attenuates Myc-Driven Transcription

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Struntz, Nicholas B., Chen, Andrew, Deutzmann, Anja, Wilson, Robert M., Stefan, Eric, Evans, Helen L., Ramirez, Maricela A., Liang, Tong +23 more·2019·Cell Chemical Biology

Abstract

The transcription factor Max is a basic-helix-loop-helix leucine zipper (bHLHLZ) protein that forms homodimers or interacts with other bHLHLZ proteins, including Myc and Mxd proteins. Among this dynamic network of interactions, the Myc/Max heterodimer has crucial roles in regulating normal cellular processes, but its transcriptional activity is deregulated in a majority of human cancers. Despite this significance, the arsenal of high-quality chemical probes to interrogate these proteins remains limited. We used small molecule microarrays to identify compounds that bind Max in a mechanistically unbiased manner. We discovered the asymmetric polycyclic lactam, KI-MS2-008, which stabilizes the Max homodimer while reducing Myc protein and Myc-regulated transcript levels. KI-MS2-008 also decreases viable cancer cell growth in a Myc-dependent manner and suppresses tumor growth in vivo. This approach demonstrates the feasibility of modulating Max with small molecules and supports altering Max dimerization as an alternative approach to targeting Myc.

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Crossref · 10.1016/j.chembiol.2019.02.009

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  • In 2019, Struntz et al. utilized SMM screening to identify KI-MS2-001 (IC50 = 1.98 μM), a molecule with a unique asymmetric polycyclic lactam compound.

    “In 2019, Struntz et al. utilized SMM (small molecule microarray) screening to identify KI-MS2-001 (168) (IC50 = 1.98 μM), a molecule with a unique asymmetric polycyclic lactam compound.422”
  • Experimental data indicate that KI-MS2-008 is effective in reducing tumor size at a low dose (0.06 mg·kg−1, iv) in mouse T-cell acute lymphoblastic leukemia (T-ALL) transplant tumor models.

    “Experimental data indicate that KI-MS2-008 is effective in reducing tumor size at a low dose (0.06 mg·kg−1, iv) in mouse T-cell acute lymphoblastic leukemia (T-ALL) transplant tumor models.”
  • Stabilizing the Max-Max homodimer can prevent Myc-Max transactivation of target genes.

    “Thus, stabilizing the Max-Max homodimer can prevent Myc-Max transactivation of target genes.422”
  • Formation of Max-Max homodimer provides an alternative mechanism for blocking Myc/Max interactions and preventing Myc/Max heterodimers from binding to DNA, resulting in reduced transcriptional activity.

    “On the other hand, formation of Max-Max homodimer provides an alternative mechanism for blocking Myc/Max interactions and preventing Myc/Max heterodimers from binding to DNA, resulting in reduced transcriptional activity.”
  • Further structural optimization led to the development of KI-MS2-008 (IC50 = 1.28 μM), which exhibits significantly increased binding affinity for Max-Max homodimers, reduces Myc protein levels, perturbs Myc-driven transcriptional programs, induces Myc-dependent cellular differentiation, and affects viable cell growth of both engineered and non-engineered cell lines.

    “Further structural optimization led to the development of KI-MS2-008 (IC50 = 1.28 μM), which exhibits significantly increased binding affinity for Max-Max homodimers, reduces Myc protein levels, perturbs Myc-driven transcriptional programs, induces Myc-dependent cellular differentiation, and affects viable cell growth of both engineered and non-engineered cell lines.”

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Authors
Struntz, N. B., Chen, A., Deutzmann, A., Wilson, R. M., Stefan, E., Evans, H. L., Ramirez, M. A., Liang, T., Caballero, F., Wildschut, M. H. E., Neel, D. V., Freeman, D. B., Pop, M. S., McConkey, M., Muller, S., Curtin, B. H., Tseng, H., Frombach, K. R., Butty, V. L., Levine, S. S., Feau, C., Elmiligy, S., Hong, J. A., Lewis, T. A., Vetere, A., Clemons, P. A., Malstrom, S. E., Ebert, B. L., Lin, C. Y., Felsher, D. W., & Koehler, A. N.
Affiliations
  • Koch Institute for Integrative Cancer Research At MIT (US)
  • Stanford Medicine (US)
  • Baylor College of Medicine (US)
  • Cambridge Intellectual Property (United Kingdom) (GB)
  • Broad Institute (US)
  • Boston Children's Hospital (US)
Corresponding author
Koehler, Angela N.
Venue
Cell Chemical Biology
Publisher
Elsevier BV
Published
2019-05
Volume
26
Issue
5
Pages
711-723.e14
ISSN
  • 2451-9448 (ISSN-L)
  • 2451-9456
OpenAlex
W2921930449
Cited by
130
References
76
Citations by year
2026: 9 · 2025: 24 · 2024: 22 · 2023: 11 · 2022: 8 · 2021: 25 · 2020: 20 · 2019: 11
FWCI
5.29
Type
journal article
Language
en
Open access
Locations
  • Cell chemical biology (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-nd)
Funders
  • National Cancer Institute (R01-CA160860, P30-CA14051)
  • Koch Institute Cancer Center (U01-CA176152)
  • NIH (CA170378PQ2, 1U01CA188383-01/S1, 1R01CA215452-01)
  • Leukemia & Lymphoma Society
  • Ono Pharma Foundation
  • MIT Deshpande Center
  • MIT Center for Precision Cancer Medicine
  • AACR
  • Merkin Institute
  • Cancer Prevention Research Institute of Texas (RR150093)
  • MIT
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chemical Synthesis and Analysis
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
Keywords
Max protein, Myc-Max heterodimer, bHLH transcription factors, small molecule inhibitors, tumor cell growth inhibition, tumor growth inhibition, chemical probes
MeSH terms
Animals, Cell Line, Disease Models, Animal, Humans, Lactams, Male, Neoplasms, Polycyclic Compounds, Promoter Regions, Genetic, Protein Binding, Repressor Proteins, Transcription, Genetic, Ultraviolet Rays, Proto-Oncogene Proteins c-myc, Mice, SCID, Mice, Inbred NOD, Dimerization, Mice, Rats, Basic Helix-Loop-Helix Leucine Zipper Transcription Factors, Small Molecule Libraries

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