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ATP competes with PIP2 for binding to gelsolin.

Dávid Szatmári1,2, Bo Xue1,3,4, Balakrishnan Kannan1

  • 1Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore.

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|August 8, 2018
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Summary
This summary is machine-generated.

Adenosine triphosphate (ATP) regulates gelsolin activity by competing with phosphatidylinositol 4,5-bisphosphate (PIP2) for binding. Calcium triggers ATP release, enabling gelsolin to sever actin filaments and regulate cell movement.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Biophysics

Background:

  • Gelsolin is a key protein regulating actin filament dynamics at the plasma membrane, influencing cell motility and morphology.
  • Gelsolin's interaction with phosphatidylinositol 4,5-bisphosphate (PIP2) is crucial for actin filament regulation, but the mechanism of its removal from PIP2 is unclear.
  • The function of adenosine triphosphate (ATP) binding to gelsolin remains largely uncharacterized.

Purpose of the Study:

  • To investigate the role of ATP in the dynamics of the PIP2-gelsolin complex.
  • To elucidate the regulatory mechanisms governing gelsolin's interaction with the plasma membrane.

Main Methods:

  • Utilized steady-state fluorescence anisotropy to study interactions between fluorophore-labeled PIP2 and ATP with gelsolin.
  • Employed Alexa488-labeled gelsolin in reconstituted systems with PIP2-containing phospholipid vesicles to assess ATP regulation.
  • Investigated the influence of physiological salt conditions and calcium on these interactions.

Main Results:

  • ATP competes with PIP2 for gelsolin binding under physiological salt conditions.
  • Calcium ions induce the release of ATP from gelsolin.
  • Characterized a proposed cycle of gelsolin activity involving calcium, ATP, and PIP2.

Conclusions:

  • ATP binding to gelsolin influences its interaction with PIP2 and the plasma membrane.
  • A cyclical model for gelsolin activity is proposed, involving sequential binding of calcium, ATP, and PIP2 to regulate actin filament severing and elongation.
  • This study provides new insights into the regulation of actin dynamics by gelsolin and its ligands.