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Neuronal cdc2-like kinase

J Lew1, J H Wang

  • 1Department of Medical Biochemistry, University of Calgary, Health Sciences Center, Alberta, Canada.

Trends in Biochemical Sciences
|January 1, 1995
PubMed
Summary

Neurofilament and tau proteins are phosphorylated by a cell-cycle-control kinase, p34cdc2-cyclin. This process is crucial for neuronal health, and its abnormalities are linked to neurodegenerative diseases like ALS and Alzheimer's.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Neurofilaments and tau are key neuronal proteins.
  • Abnormal phosphorylation of these proteins is implicated in neurodegenerative diseases, including amylotrophic lateral sclerosis (ALS) and Alzheimer's disease.
  • The cell-cycle-control protein kinase p34cdc2-cyclin is known to phosphorylate proteins at specific consensus motifs.

Purpose of the Study:

  • To investigate the specific kinase responsible for the phosphorylation of neurofilament proteins and tau in vivo.
  • To understand the role of cell-cycle-related kinases in neuronal protein modification.
  • To explore the link between kinase activity and neurodegenerative disease pathology.

Main Methods:

  • In vivo phosphorylation analysis of neurofilament proteins and tau.
  • Identification of phosphorylation sites and comparison with known kinase consensus motifs.
  • Biochemical characterization of a novel cdc2-like kinase activity in brain tissue.

Main Results:

  • Phosphorylation sites on neurofilament proteins and tau conform to the p34cdc2-cyclin consensus motif.
  • A novel cdc2-like kinase, comprising cyclin-dependent kinase 5 (cdk5) and a brain-specific regulatory subunit, was identified.
  • This cdk5-based kinase is proposed to be responsible for the observed phosphorylation patterns.

Conclusions:

  • The phosphorylation of neurofilaments and tau by a cdc2-like kinase is a significant post-translational modification in neurons.
  • Dysregulation of this cdk5-based kinase activity may contribute to the pathogenesis of neurodegenerative disorders.
  • Targeting this kinase could offer a therapeutic strategy for diseases like ALS and Alzheimer's.

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