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Updated: Jun 30, 2025

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A Ruthenium(II) Polypyridyl Complex Disrupts Actin Cytoskeleton Assembly and Blocks Cytokinesis.

Martin R Gill1, Paul J Jarman2, Vanessa Hearnden3

  • 1Department of Chemistry Faculty of Science and Engineering Swansea University UK.

Angewandte Chemie (Weinheim an Der Bergstrasse, Germany)
|March 20, 2024
PubMed
Summary

The dinuclear ruthenium complex RuRuPhen inhibits actin polymerization by binding to G-actin. This disrupts cell motility and causes cytokinesis failure by interfering with ESCRT complex recruitment.

Keywords:
ActinCytokinesisCytoskeletonPolypyridyl ComplexesRuthenium

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Chemical Biology

Background:

  • Actin dynamics are crucial for cell functions like motility and division.
  • Targeting actin polymerization is a strategy for developing novel therapeutics.
  • The dinuclear ruthenium(II) complex, RuRuPhen, has been investigated for its biological activity.

Purpose of the Study:

  • To investigate the mechanism by which RuRuPhen affects actin dynamics.
  • To determine the impact of RuRuPhen on cellular processes including cell motility and cytokinesis.
  • To elucidate the molecular targets of RuRuPhen in cellular division.

Main Methods:

  • Molecular docking studies to predict binding sites of RuRuPhen on G-actin.
  • Cell-based assays to assess the effects of RuRuPhen on actin stress fibers, actomyosin contractility, and cell motility.
  • Immunofluorescent microscopy to visualize the impact of RuRuPhen on cytokinesis and ESCRT complex localization.

Main Results:

  • RuRuPhen binds to the surface of G-actin, inhibiting its polymerization into F-actin filaments without affecting pre-formed filaments.
  • RuRuPhen disrupts actin stress fiber organization, leading to compromised actomyosin contractility and reduced cell motility.
  • RuRuPhen causes failure in late-stage cytokinesis by preventing the recruitment of endosomal sorting complexes required for transport (ESCRT) complexes.

Conclusions:

  • RuRuPhen is a novel inhibitor of actin polymerization targeting G-actin.
  • RuRuPhen disrupts essential cellular processes, including cell motility and cytokinesis.
  • Interference with ESCRT complex recruitment is the mechanism by which RuRuPhen inhibits cytokinesis, offering potential for therapeutic development.