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Dynamin: membrane scission meets physics.

James H Hurley1, Jenny E Hinshaw

  • 1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA. james.hurley@nih.gov

Current Biology : CB
|December 22, 2012
PubMed
Summary

Dynamin, a protein crucial for cell membrane function, uses GTP hydrolysis to constrict and sever membranes. New research highlights the roles of membrane tension and bending in this constriction process.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Molecular Motors

Background:

  • Dynamin is a GTPase essential for membrane remodeling processes, including endocytosis.
  • Its mechanical functions in membrane constriction and scission are critical for cellular function.
  • Understanding dynamin's mechanism requires integrating its biochemical activity with physical principles.

Purpose of the Study:

  • To elucidate the physical mechanisms underlying dynamin-mediated membrane constriction.
  • To investigate the influence of membrane properties, such as tension and bending, on dynamin's function.
  • To bridge the gap between dynamin's molecular activity and its macroscopic effects on membranes.

Main Methods:

  • Utilized advanced biophysical techniques to observe dynamin in action.
  • Performed experiments manipulating membrane tension and curvature.
  • Applied physical models to interpret dynamin's force-generating capabilities.

Main Results:

  • Demonstrated that dynamin's GTPase activity is coupled to mechanical work on the membrane.
  • Showed that membrane tension significantly impacts the efficiency of dynamin-mediated constriction.
  • Identified membrane bending at the constriction site as a key factor in scission.
  • Revealed dynamin's ability to generate forces relevant to membrane fission.

Conclusions:

  • Dynamin functions as a mechanochemical enzyme, utilizing GTP hydrolysis to overcome membrane energy barriers.
  • Membrane physical properties are not passive but actively influence and are modulated by dynamin.
  • This work provides a physics-based framework for understanding dynamin's role in membrane dynamics.