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Protein kinase C gamma mutations in spinocerebellar ataxia 14 increase kinase activity and alter membrane targeting

D S Verbeek1, M A Knight, G G Harmison

  • 1Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda 20892, USA.

Brain : a Journal of Neurology
|December 25, 2004
PubMed

Insights

Mutations in the protein kinase C gamma (PKCgamma) gene cause spinocerebellar ataxia type 14 (SCA14). This study shows these mutations enhance PKCgamma activity and alter its cellular localization, potentially leading to neuronal degeneration.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Spinocerebellar ataxia type 14 (SCA14) is a neurodegenerative disorder linked to mutations in the protein kinase C gamma (PKCgamma) gene.
  • Understanding how these mutations affect PKCgamma function is crucial for elucidating SCA14 pathogenesis.

Purpose of the Study:

  • To investigate the functional consequences of two specific SCA14 missense mutations (G118D and C150F) on PKCgamma.
  • To determine the impact of these mutations on PKCgamma activity and cellular localization.

Main Methods:

  • Site-directed mutagenesis to introduce G118D and C150F mutations into the PKCgamma gene.
  • Biochemical assays to measure the intrinsic activity of wild-type and mutant PKCgamma.
  • Live-cell imaging using fluorescently labeled PKCgamma to visualize subcellular localization in response to calcium influx.

Main Results:

  • Both G118D and C150F mutations significantly increase the intrinsic enzymatic activity of PKCgamma.
  • Mutant PKCgamma exhibits accelerated translocation to specific plasma membrane regions upon calcium (Ca2+) influx compared to wild-type.
  • These findings reveal altered protein dynamics and enhanced catalytic function of mutant PKCgamma.

Conclusions:

  • The studied SCA14 mutations confer enhanced activity and altered localization to PKCgamma.
  • These functional changes in PKCgamma are likely key contributors to the selective neuronal degeneration observed in SCA14 patients.
  • Targeting these specific molecular dysfunctions may offer therapeutic avenues for SCA14.

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