Related Experiment Video

Updated: Oct 29, 2025

Identification of Transcription Factor Regulators using Medium-Throughput Screening of Arrayed Libraries and a Dual-Luciferase-Based Reporter
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Small peptide inhibitor from the sequence of RUNX3 disrupts PAK1-RUNX3 interaction and abrogates its

Rahul Kanumuri1,2, Aruna Kumar Chelluboyina1,3, Jayashree Biswal4

  • 1Department of Biotechnology, Indian Institute of technology Madras (IITM), Chennai, Tamilnadu, India.

Oncogene
|July 13, 2021
PubMed

Insights

A novel peptide (RMR) targeting P21 Activated Kinase 1 (PAK1) phosphorylation of Runt-related transcription factor 3 (RUNX3) showed therapeutic potential. This peptide inhibits RUNX3 phosphorylation, blocking cancer-promoting functions in preclinical models.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • P21 Activated Kinase 1 (PAK1) is an oncogenic kinase regulating cytoskeleton and cell morphology.
  • Runt-related transcription factor 3 (RUNX3) exhibits dual roles, acting as a tumor suppressor or oncogene.
  • RUNX3 phosphorylation at Threonine 209 by PAK1 dictates its context-specific functions.

Purpose of the Study:

  • To design and validate a peptide inhibitor targeting PAK1-mediated RUNX3 phosphorylation.
  • To explore the therapeutic potential of this peptide in preclinical cancer models.

Main Methods:

  • Computational modeling to select a RUNX3-derived peptide (RMR) that inhibits PAK1 interaction.
  • In vitro and in vivo studies to assess peptide stability, toxicity, and efficacy.
  • Evaluation of peptide's ability to block RUNX3 phosphorylation and tumorigenic functions in cell, explant, and xenograft models.

Main Results:

  • The RMR peptide is stable, non-toxic to normal cells, and effectively inhibits RUNX3 Threonine 209 phosphorylation by PAK1.
  • The peptide demonstrated efficacy in blocking RUNX3 phosphorylation-mediated tumorigenic phenotypes across various preclinical models.

Conclusions:

  • The RMR peptide represents a promising therapeutic candidate for targeting RUNX3 phosphorylation-dependent cancers.
  • This study highlights the translational potential of targeting specific kinase-substrate interactions for cancer therapy.

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