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Src regulates the activity of the mammalian formin protein FHOD1

Sreenivas Koka1, Gerald T Minick, You Zhou

  • 1Department of Dental Specialties, Mayo Clinic, Rochester, Minnesota, USA. koka.sreenivas@mayo.edu

Biochemical and Biophysical Research Communications
|September 20, 2005
PubMed

Insights

The study reveals that Src kinase is crucial for regulating formin homology domain containing protein 1 (FHOD1) functions. Src controls FHOD1

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The formin FHOD1 protein impacts cell migration, cytoskeleton organization, and gene expression.
  • Understanding FHOD1 regulation is key to deciphering its cellular roles.

Purpose of the Study:

  • To investigate the regulatory role of Src in FHOD1-mediated cellular processes.
  • To elucidate the mechanisms by which Src influences FHOD1 activity and expression.

Main Methods:

  • Investigated FHOD1 localization in cells lacking Src.
  • Analyzed stress fiber formation with truncated FHOD1 variants.
  • Assessed gene expression from specific promoters.
  • Examined the effect of Src inhibition on FHOD1-induced gene expression and FHOD1 mRNA levels.

Main Results:

  • Src absence prevented FHOD1 localization to lamellipodia but did not affect stress fiber formation by truncated FHOD1.
  • Src tyrosine kinase activity was essential for FHOD1-induced gene expression from SRE and skeletal actin promoters.
  • Src activity maintained FHOD1 mRNA levels, indicating a regulatory feedback loop.

Conclusions:

  • Src is identified as a critical regulator of FHOD1 biology.
  • This study provides the first insights into the regulation of mammalian formin gene expression.
  • Src influences FHOD1 localization, gene expression induction, and its own mRNA levels.

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