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Related Experiment Video

Updated: Apr 18, 2026

Author Spotlight: Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos
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GAK antagonises ROCK-dependent regulation of actomyosin dynamics.

Masaki Hiramoto1, Naoharu Takano1, Hiroko Kokuba2

  • 1Department of Biochemistry, Tokyo Medical University, Tokyo 160-8402, Japan.

Journal of Cell Science
|April 17, 2026
PubMed
Summary
This summary is machine-generated.

Cyclin G-associated kinase (GAK) antagonizes Rho-associated kinase (ROCK) signaling. GAK

Keywords:
ARHGEF2ActomyosinCell migrationGAKROCKStress fibre

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Area of Science:

  • Cell Biology
  • Molecular Biology

Background:

  • Cytoskeletal proteins like actin and myosin regulate cell morphology and motility.
  • Rho-associated kinase (ROCK) controls actomyosin dynamics, stress fiber formation, and cell migration.
  • Cyclin G-associated kinase (GAK) was previously shown to antagonize ROCK signaling but the mechanism was unclear.

Purpose of the Study:

  • To investigate the role of GAK in cytoskeletal dynamics and cell motility.
  • To elucidate the molecular mechanisms by which GAK antagonizes ROCK signaling.

Main Methods:

  • Genetic disruption of GAK (GAK-knockout cells).
  • Analysis of stress fiber formation and cell migration.
  • Assessment of myosin light chain (MLC) phosphorylation.
  • Investigation of GAK's intrinsically disordered region (IDR) function.
  • Co-immunoprecipitation to study protein interactions.
  • ARHGEF2 knockdown experiments.
  • Analysis of MLC expression.

Main Results:

  • GAK-knockout cells showed increased stress fiber formation and cell migration.
  • Enhanced phosphorylation of MLC was observed in GAK-knockout cells.
  • GAK's IDR, rather than its kinase activity, was crucial for inhibiting stress fiber formation and MLC phosphorylation.
  • GAK IDR interacted with ARHGEF2, and ARHGEF2 knockdown reversed stress fiber formation in GAK-knockout cells.
  • GAK IDR was found to regulate MLC expression.

Conclusions:

  • GAK's intrinsically disordered region (IDR) is a key regulator of actomyosin dynamics and cell motility.
  • GAK antagonizes ROCK-dependent cytoskeletal regulation.
  • GAK exerts its function through coordinated control of ARHGEF2 activity and MLC expression.