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Related Experiment Video

Updated: Apr 3, 2026

Assessing Cellular Target Engagement by SHP2 PTPN11 Phosphatase Inhibitors

Assessing Cellular Target Engagement by SHP2 PTPN11 Phosphatase Inhibitors

Published on: July 17, 2020

Rational discovery of therapeutic PAK1 allosteric activators.

Yu He¹, James S H Bae¹, Elżbieta Nowak²

¹Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, UK.

|April 2, 2026

Summary

Researchers discovered small molecules that activate p21-activated kinase-1 (PAK1), a key protein for heart health. This breakthrough offers a new strategy for developing kinase activators to treat cardiac conditions like hypertrophy.

Keywords:

HCM PAK1 autoinhibitory regulation drug discovery hypertrophic cardiomyopathy kinase allosteric activator p21-activated kinase-1 protein kinase

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Amide Hydrogen/Deuterium Exchange & MALDI-TOF Mass Spectrometry Analysis of Pak2 Activation

Amide Hydrogen/Deuterium Exchange & MALDI-TOF Mass Spectrometry Analysis of Pak2 Activation

Published on: November 26, 2011

Area of Science:

Biochemistry
Molecular Biology
Cardiovascular Research

Background:

Kinase activators offer therapeutic potential but are difficult to develop.
p21-activated kinase-1 (PAK1) is crucial for maintaining cardiac homeostasis.
Targeting kinase autoinhibitory mechanisms is an underexplored therapeutic avenue.

Purpose of the Study:

To discover direct small-molecule activators of PAK1.
To explore the modulation of PAK1 autoinhibitory regulation for therapeutic benefit.
To investigate the efficacy of PAK1 activators in cardiac hypertrophy models.

Main Methods:

Utilized a rational peptide-guided strategy to target PAK1 autoinhibition.
Performed high-throughput screening and medicinal chemistry for optimization.
Conducted structural and mechanistic analyses to understand activator function.
Validated enhanced PAK1 signaling in cardiac cells and in vivo models.

Main Results:

Identified a novel autoinhibition-release site in PAK1.
Developed selective allosteric PAK1 activators with micromolar potency.
Demonstrated that activators disrupt autoinhibition and promote the active kinase state.
Confirmed therapeutic efficacy in models of cardiac hypertrophy.

Conclusions:

Rational modulation of kinase autoinhibitory regulation is a viable strategy for discovering kinase activators.
Developed PAK1 activators show therapeutic promise for cardiac hypertrophy.
This approach broadens the potential for developing novel kinase-targeting therapeutics.