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Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions
06:50

Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions

Published on: January 26, 2024

Serine 209 resides within a putative p38(MAPK) consensus motif and regulates monoamine oxidase-A activity

Xia Cao1, Lewei Rui, Paul R Pennington

  • 1Cell Signalling Laboratory, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.

Journal of Neurochemistry
|August 5, 2009
PubMed

Insights

Inhibition of p38 mitogen-activated protein kinase (MAPK) activates monoamine oxidase-A (MAO-A), increasing neurotoxicity. This p38 MAPK-dependent regulation of MAO-A may be an adaptive response to oxidative stress in neurological disorders.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • The p38 mitogen-activated protein kinase (MAPK) cascade and monoamine oxidase-A (MAO-A) are implicated in oxidative stress.
  • MAO-A activity contributes to neurotoxicity and is linked to various neurological conditions.

Purpose of the Study:

  • To investigate the regulatory relationship between p38 MAPK and MAO-A.
  • To determine if p38 MAPK directly influences MAO-A activity and its associated neurotoxicity.

Main Methods:

  • Utilized chemical inhibitors and dominant-negative clones to inhibit p38 MAPK in neuronal cell lines.
  • Employed over-expression of constitutively active p38 MAPK and MAO-A variants (phosphomimic and dephosphorylation mimics).
  • Assessed MAO-A activity, protein phosphorylation, and neurotoxicity in vitro.

Main Results:

  • Specific inhibition of p38 MAPK selectively induced MAO-A activity and MAO-A-sensitive toxicity.
  • Over-expression of active p38 MAPK led to MAO-A phosphorylation and inhibited its activity.
  • MAO-A variants mimicking dephosphorylation (MAO-A(Ser209Ala)) were highly active and toxic, unlike phosphomimics.

Conclusions:

  • Data strongly suggest a direct p38 MAPK-dependent inhibition of MAO-A function.
  • This endogenous regulation of MAO-A by p38 MAPK could be an adaptive response to oxidative stress.
  • Findings may have implications for understanding and treating disorders like depression, ischemia, and Alzheimer's disease.

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