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A highly-sensitive high throughput assay for dynamin's basal GTPase activity.

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  • 1Department of Cell Biology, UT Southwestern Medical Center, Dallas, TX, United States of America.

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Summary

A new sensitive assay detects dynamin's basal GTPase activity, identifying novel inhibitors for clathrin-mediated endocytosis. This method reveals limitations of current dynamin inhibitors like Dynasore and Dyngo-4a.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Clathrin-mediated endocytosis is crucial for cellular uptake.
  • Dynamin GTPase regulates vesicle scission during endocytosis.
  • Existing dynamin inhibitors lack specificity and their mechanisms are unclear.

Purpose of the Study:

  • Develop a sensitive assay for dynamin's basal GTPase activity.
  • Identify novel dynamin inhibitors using high-throughput screening.
  • Re-evaluate known dynamin inhibitors like Dynasore and Dyngo-4a.

Main Methods:

  • Established a highly sensitive fluorescence-based assay for dynamin basal GTPase activity.
  • Performed a pilot high-throughput screen of 8000 compounds.
  • Validated hit compounds using dose-response curves.

Main Results:

  • Identified several compounds inhibiting dynamin-1 basal GTPase activity.
  • Dynasore and Dyngo-4a did not inhibit basal GTPase activity.
  • These known inhibitors only affected assembly-stimulated GTPase activity.

Conclusions:

  • The new assay enables sensitive screening for dynamin inhibitors.
  • Current inhibitors may have different mechanisms than previously thought.
  • This assay facilitates discovery of more potent and specific dynamin inhibitors.