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Severin is a gelsolin prototype.

H L Yin1, P A Janmey, M Schleicher

  • 1Department of Physiology, University of Texas Southwestern Medical Center, Dallas.

FEBS Letters
|May 7, 1990
PubMed
Summary
This summary is machine-generated.

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Severin and gelsolin are calcium-activated actin filament severing proteins. Severin

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Eukaryotic cells utilize calcium-activated actin filament severing proteins.
  • Gelsolin (80-90 kDa) and villin are found in vertebrates, while severin and fragmin (approx. 40 kDa) are found in invertebrates.

Purpose of the Study:

  • To directly compare the functional properties of gelsolin and severin.
  • To investigate the evolutionary relationship between gelsolin and severin.
  • To explore the potential role of severin in agonist-stimulated actin cytoskeleton regulation.

Main Methods:

  • Isolation and characterization of gelsolin and severin.
  • Functional assays measuring actin filament severing and nucleation.
  • Comparative analysis of protein properties.

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Main Results:

  • Severin's actin filament severing activity is inhibited by polyphosphoinositides, similar to gelsolin.
  • Severin exhibits less efficient actin filament nucleation compared to gelsolin.
  • Severin's functional characteristics resemble the N-terminal half of gelsolin, suggesting evolutionary relatedness.

Conclusions:

  • Severin and gelsolin share functional similarities, particularly in calcium-activated actin filament severing and regulation by polyphosphoinositides.
  • Severin's properties suggest it is evolutionarily related to gelsolin.
  • Polyphospholipid regulation of severin indicates its potential involvement in Dictyostelium discoideum's actin cytoskeleton dynamics during agonist stimulation.