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Inhibition of Myc transcriptional activity by a mini-protein based upon Mxd1

Mark J Demma1, Michael J Hohn2, Angie Sun3

  • 1Oncology Discovery, Merck & Co., Inc., Boston, MA, USA.

FEBS Letters
|February 14, 2020
PubMed

Insights

A novel mini-protein, Mad, derived from Mxd1, shows significantly enhanced potency in inhibiting Myc oncogene activity compared to Omomyc. Mad effectively represses Myc-driven transcription and cell proliferation, offering a promising new therapeutic strategy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Myc is a transcription factor with oncogenic activity, frequently dysregulated in cancer.
  • Current inhibitors of Myc, such as Omomyc, exhibit limited efficacy.
  • Developing more potent Myc inhibitors is crucial for cancer therapy.

Purpose of the Study:

  • To investigate a novel mini-protein, Mad, derived from Mxd1, as a potential Myc inhibitor.
  • To compare the potency and mechanism of Mad with the existing inhibitor Omomyc.
  • To evaluate Mad's efficacy in inhibiting Myc-driven cellular processes.

Main Methods:

  • Generation of the Mad mini-protein from Mxd1.
  • Assessment of Mad's cellular localization and interaction with Myc-binding partners (Max, NUBP).
  • In vitro and cellular assays to measure inhibition of Myc-driven proliferation and transcription.
  • Comparative analysis of Mad and Omomyc efficacy.

Main Results:

  • Mad, a mini-protein derived from Mxd1, localizes to the nucleus.
  • Mad demonstrates 10-fold greater potency than Omomyc in inhibiting Myc-driven cell proliferation.
  • Mad interacts with Max and NUBP, binds E-Box DNA, and represses Myc-mediated transcription more effectively than Omomyc.
  • Mad exhibits superior in vitro and cellular activity compared to Omomyc.

Conclusions:

  • Mad is a highly potent inhibitor of Myc oncogenic activity.
  • Mad's enhanced efficacy stems from its potent repression of Myc-mediated transcription.
  • Mad represents a promising therapeutic candidate for cancers driven by Myc.
Keywords:
MaxMycMyc inhibitorsOmomyccanceroncogene

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