Strategy and validation of a structure-based method for the discovery of selective inhibitors of PAK isoforms and the

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Pei-Lu Song1, Gang Wang2, Yuan Su1

  • 1Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang 110016, China.

Bioorganic Chemistry
|August 11, 2019
PubMed

Insights

Researchers discovered SPU-106, a novel small molecule inhibitor targeting p21 activated kinase 4 (PAK4). This compound effectively inhibits cancer cell invasion by blocking key signaling pathways without causing cytotoxicity, offering potential as an antitumor agent.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • p21 activated kinase 4 (PAK4) is a serine/threonine protein kinase implicated in cancer development.
  • Targeting PAK4 is a promising strategy for cancer therapy.

Purpose of the Study:

  • To discover novel and selective small molecule inhibitors of PAK4 using structure-based virtual screening.
  • To characterize the binding mode and inhibitory potential of the identified compound.

Main Methods:

  • Structure-based virtual screening and molecular docking.
  • Molecular dynamics (MD) simulations.
  • Kinase activity assays and western blot analysis to assess pathway inhibition.

Main Results:

  • A novel compound, SPU-106, was identified as an effective and selective PAK4 inhibitor.
  • SPU-106 binds to the PAK4 kinase domain with an IC50 of 21.36 μM.
  • SPU-106 inhibited SGC7901 cell invasion without cytotoxicity and suppressed PAK4/LIMK1/cofilin and PAK4/SCG10 signaling.

Conclusions:

  • Computational strategies successfully identified a selective PAK4 inhibitor.
  • SPU-106 demonstrates potential as an antitumor agent for further preclinical development.
Keywords:
Biotin-avidin systemMolecular dynamics simulationPAK4 inhibitorVirtual screening

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