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Updated: Jan 18, 2026

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The Ras association domain of DydA as a specific reporter of activated RasG in Dictyostelium

Nara Han1, Uri Han1, Dahyeon Kim1

  • 1Department of Integrative Biological Sciences & BK21 FOUR Educational Research Group for Age-associated Disorder Control Technology, Chosun University, Gwangju, Republic of Korea.

Biochemical and Biophysical Research Communications
|September 11, 2025
PubMed

Insights

Researchers developed a new biosensor to track activated RasG proteins in Dictyostelium cells. This tool specifically monitors RasG, aiding the study of cell movement and cytoskeletal changes.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Ras proteins are crucial molecular switches regulating cell functions like chemotaxis.
  • Existing tools lack specificity for monitoring individual Ras protein isoforms.
  • Understanding Ras isoform activity is key to deciphering cellular processes.

Purpose of the Study:

  • To characterize the RA1 domain of DydA as a selective biosensor for activated RasG.
  • To develop an isoform-specific tool for monitoring RasG activation in real-time.
  • To investigate the spatial and temporal dynamics of RasG signaling during chemotaxis.

Main Methods:

  • Biochemical pull-down assays to assess binding specificity.
  • Yeast two-hybrid analyses for protein interaction studies.
  • Live-cell imaging of GFP-tagged RA1:DydA in Dictyostelium.

Main Results:

  • The RA1 domain selectively binds RasG over other Ras isoforms and Rap1.
  • GFP-RA1:DydA translocates to the cell cortex and leading edge during chemotaxis.
  • Localization is dependent on GPCR and G-protein signaling, indicating sensitivity to chemoattractant cues.
  • Demonstrated spatially restricted RasG activation during chemotactic migration.

Conclusions:

  • RA1:DydA serves as a reliable, isoform-specific biosensor for RasG.
  • Enables high-resolution analysis of RasG signaling in Dictyostelium.
  • Provides a valuable tool for studying Ras isoform functions in chemotaxis and actin regulation.
Keywords:
BiosensorDictyosteliumLive-cell imagingRas association domainRas proteins

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