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Related Experiment Videos

Substrate phosphorylation in the protein kinase Cgamma knockout mouse

G M Ramakers1, D D Gerendasy, P N de Graan

  • 1Rudolf Magnus Institute for Neurosciences, Department of Medical Pharmacology, Unversiteitsweg 100, 3584 CG Utrecht, The Netherlands. geert.ramakers@basalmed.uio.no

The Journal of Biological Chemistry
|January 16, 1999
PubMed
Summary

Protein kinase C gamma, crucial for neural function, phosphorylates the RC3 protein. Its absence impairs spatial learning and hippocampal long-term potentiation (LTP) in mice.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Protein kinase C (PKC) is a family of enzymes involved in cell signaling.
  • Specific PKC subtypes, like PKC-gamma, play roles in neural function.
  • RC3 is a neural-specific substrate of PKC.

Purpose of the Study:

  • To investigate the role of protein kinase C gamma (PKC-gamma) in phosphorylating neural substrates.
  • To elucidate the biochemical pathway linking glutamate receptor activation to RC3 phosphorylation.
  • To determine the contribution of PKC-gamma to spatial learning and hippocampal long-term potentiation (LTP).

Main Methods:

  • Quantitative immunoprecipitation was used to measure the phosphorylation state of RC3, GAP-43/B-50, and MARCKS.
  • Experiments were conducted on hippocampal slices from mice lacking PKC-gamma and wild-type controls.

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  • Stimulation methods included potassium-induced depolarization, glutamate receptor activation, and phorbol ester treatment.

    • Main Results:

    • PKC-gamma deficiency abolished depolarization- and glutamate-induced RC3 phosphorylation.
    • Direct stimulation of PKC with phorbol ester also failed to increase RC3 phosphorylation in PKC-gamma knockout mice.
    • These findings indicate PKC-gamma is essential for RC3 phosphorylation via postsynaptic glutamate receptor activation.

    Conclusions:

    • A biochemical pathway exists where postsynaptic glutamate receptor activation stimulates PKC-gamma, leading to RC3 phosphorylation.
    • The absence of PKC-gamma impairs RC3 phosphorylation, potentially contributing to spatial learning deficits and impaired hippocampal LTP.
    • PKC-gamma is critical for synaptic plasticity and cognitive functions mediated by the hippocampus.