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KLHL23 and RhoGDI coordinate CDC42 inactivation ensuring membrane homeostasis.

Po-Cheng Liao1,2, Hao-Chun Chang1, Yi-Chung Liu3

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This summary is machine-generated.

The KLHL23/RhoGDI-CDC42 pathway controls cell migration by inactivating CDC42. Disrupting this axis promotes metastasis, highlighting its therapeutic potential.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • F-Actin cytoskeleton remodeling is crucial for cellular processes like migration and development.
  • The small GTPase CDC42 regulates F-actin dynamics but its turnover mechanisms are not fully understood.

Purpose of the Study:

  • To elucidate the mechanisms governing CDC42 inactivation and its biological significance.
  • To investigate the roles of KLHL23 and RhoGDI in CDC42 regulation.

Main Methods:

  • Investigated KLHL23-mediated polyubiquitylation and RhoGDI-mediated sequestration of CDC42.
  • Utilized Fluorescence Resonance Energy Transfer (FRET) assays to study spatiotemporal inactivation.
  • Examined the effects of KLHL23 depletion and a CDC42 variant (Y64C) in Takenouchi-Kosaki Syndrome.

Main Results:

  • KLHL23 targets CDC42•GTP for degradation, while RhoGDI sequesters CDC42•GDP, leading to coordinated inactivation.
  • KLHL23 and RhoGDI compete for CDC42's switch II region, ensuring specificity for different CDC42 states.
  • KLHL23 depletion causes excessive membrane protrusions and promotes metastasis; the CDC42-Y64C variant evades degradation.

Conclusions:

  • The KLHL23/RhoGDI-CDC42 axis spatiotemporally co-inactivates CDC42, maintaining membrane homeostasis during migration.
  • Dysregulation of this axis contributes to excessive cell protrusion and metastasis.
  • This pathway represents a potential therapeutic target for diseases involving aberrant cell migration.