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ArpC5 isoforms regulate Arp2/3 complex-dependent protrusion through differential Ena/VASP positioning.

Florian Fäßler1, Manjunath G Javoor1, Julia Datler1

  • 1Institute of Science and Technology Austria (ISTA), Klosterneuburg, Austria.

Science Advances
|January 20, 2023
PubMed
Summary
This summary is machine-generated.

The Arp2/3 complex subunit isoforms ArpC5 and ArpC5L differentially regulate cell migration by affecting actin network stability and dynamics. These isoforms influence Ena/VASP protein positioning, suggesting a signaling pathway that enhances cell movement.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Actin networks are crucial for cell migration, with the Arp2/3 complex mediating branched actin nucleation.
  • Subunit isoforms of the Arp2/3 complex, such as ArpC5 and ArpC5L, are emerging regulators of its activity.
  • Understanding isoform-specific roles is key to deciphering Arp2/3 complex function in cellular processes.

Purpose of the Study:

  • To investigate the differential effects of ArpC5 and ArpC5L isoforms on cell migration.
  • To elucidate the structural and dynamic mechanisms by which these isoforms influence actin networks.
  • To explore the interplay between ArpC5 isoforms and Ena/VASP proteins in regulating actin assembly.

Main Methods:

  • Reverse genetics approaches were employed to study ArpC5 and ArpC5L.
  • Cellular structural biology techniques were utilized to analyze actin network ultrastructure.
  • Protein dynamics and positioning of Ena/VASP family members were assessed.

Main Results:

  • ArpC5 and ArpC5L isoforms differentially impact cell migration dynamics.
  • Both isoforms stabilize ArpC1 at branch junctions, influencing protrusion characteristics and actin network ultrastructure.
  • ArpC5 isoforms dictate the positioning of Ena/VASP proteins, modulating actin assembly levels.

Conclusions:

  • ArpC5 and ArpC5L play distinct roles in regulating Arp2/3 complex-mediated cell migration.
  • The ArpC5-Ena/VASP axis represents a novel signaling pathway that enhances cell migration.
  • Differential subunit composition provides a mechanism for fine-tuning actin network formation and cell motility.