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The polymerization motor.

J A Theriot1

  • 1Department of Biochemistry and Department of Microbiology & Immunology, Stanford University School of Medicine, Stanford, CA 94305-5307, USA. theriot@cmgm.stanford.edu

Traffic (Copenhagen, Denmark)
|February 24, 2001
PubMed
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Cellular movement relies on actin filaments and microtubules. This review explores how nonequilibrium polymerization converts chemical energy into mechanical force, highlighting actin

Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Actin filaments and microtubules are key cytoskeletal components.
  • Their polymerization and depolymerization drive cellular motility processes.
  • Examples include lamellipodial protrusion and chromosome segregation.

Purpose of the Study:

  • To review thermodynamic and physical theories of force generation by nonequilibrium polymerization.
  • To summarize evidence for actin polymerization producing motile force.
  • To connect chemical energy transduction to mechanical work in biological systems.

Main Methods:

  • Review of existing thermodynamic theories.
  • Analysis of physical models for polymerization dynamics.
  • Synthesis of experimental evidence from various biological systems.

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Main Results:

  • Non-equilibrium polymerization reactions can transduce chemical energy into mechanical energy.
  • Actin polymerization is a demonstrated source of motile force in multiple cellular contexts.
  • Theoretical frameworks explain force generation at the molecular level.

Conclusions:

  • The polymerization of actin filaments and microtubules is a fundamental mechanism for cellular force generation.
  • Understanding these nonequilibrium processes is crucial for cell motility research.
  • Actin polymerization's role in producing mechanical force is supported by substantial evidence.