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Arp2/3 complex subunit ARPC2 binds to microtubules.

Lenka Havelková1, Gitanjali Nanda1, Jan Martinek1

  • 1Charles University in Prague, Faculty of Science, Department of Experimental Plant Biology, Viničná 5, 128 44 Prague 2, Czech Republic.

Plant Science : an International Journal of Experimental Plant Biology
|December 27, 2015
PubMed
Summary

The Arp2/3 complex subunit ARPC2 binds to microtubules, revealing a novel interaction between actin filaments and microtubules. This finding offers new insights into cytoskeleton regulation and plant cell morphogenesis.

Keywords:
ActinActin filamentsArp2/3MicrotubulesTubulin

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Area of Science:

  • Plant Biology
  • Cell Biology
  • Cytoskeleton Dynamics

Background:

  • The Arp2/3 complex is crucial for actin filament nucleation in various organisms.
  • Plant cell morphogenesis relies on Arp2/3-mediated actin nucleation, as evidenced by mutant phenotypes.

Purpose of the Study:

  • To investigate the interaction of ARPC2, a core Arp2/3 complex subunit, with microtubules.
  • To elucidate the molecular mechanisms underlying the interaction between actin filaments and microtubules in plants.

Main Methods:

  • Expression of GFP-ARPC2 in plant cells (Nicotiana tabacum, Nicotiana benthamiana, Arabidopsis thaliana).
  • Pharmacological disruption of actin filament and microtubule dynamics.
  • In vitro co-sedimentation assays with truncated ARPC2 proteins and microtubules.

Main Results:

  • ARPC2 was observed to associate with microtubules in plant cells.
  • Pharmacological treatments and co-sedimentation assays confirmed the ARPC2-microtubule interaction.
  • A specific microtubule-binding domain within NtARPC2 was identified.

Conclusions:

  • ARPC2 directly interacts with microtubules, independent of actin filaments.
  • This interaction suggests a new mechanism for cross-talk between actin filaments and microtubules.
  • The findings provide novel insights into cytoskeleton organization and its role in plant cell development.