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Related Experiment Video

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A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors
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BRI2 and BRI3 are functionally distinct phosphoproteins.

Filipa Martins1, Sandra Rebelo1, Mariana Santos1

  • 1Laboratório de Neurociências e Sinalização Celular, Centro de Biologia Celular, iBiMED, SACS, Universidade de Aveiro, Aveiro, Portugal.

Cellular Signalling
|October 31, 2015
PubMed
Summary

Researchers discovered that BRI2 and BRI3 proteins bind to Protein Phosphatase 1 (PP1). This interaction is crucial for regulating neuronal function and may impact neurodegenerative diseases like Alzheimer's.

Keywords:
Familial British dementiaFamilial Danish dementiaNeuritogenesisPP1 binding motifPP1 interacting proteinProtein phosphatase 1

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Three BRI protein family members exist, including BRI2 and BRI3.
  • BRI2 is linked to Familial Danish and British dementias.
  • Protein phosphorylation, regulated by Protein Phosphatase 1 (PP1), is key to cellular processes.

Purpose of the Study:

  • To investigate the interaction between BRI2, BRI3, and PP1.
  • To determine if BRI2 and BRI3 are substrates of PP1.
  • To explore the functional implications of BRI2 and BRI3 phosphorylation in neuronal systems.

Main Methods:

  • In silico sequence analysis to identify PP1 binding sites.
  • Expression of Myc-tagged BRI2 and BRI3 constructs (wild type and PP1 binding mutants).
  • In vitro and in vivo validation of BRI2:PP1 and BRI3:PP1 complexes.
  • Subcellular localization studies in non-neuronal cells, SH-SY5Y cells, and rat cortical neurons.
  • Co-localization studies of BRI2, BRI3, and PP1.

Main Results:

  • BRI2 and BRI3 directly bind to PP1, forming validated BRI2:PP1 and BRI3:PP1 complexes.
  • BRI2 and BRI3 are substrates of PP1, representing the first report of their phosphorylation.
  • Phosphorylation of BRI2 significantly enhances neuronal outgrowth and differentiation.
  • BRI2 and BRI3 exhibit similar subcellular localization patterns, including neuronal processes and cell bodies.

Conclusions:

  • BRI2 and BRI3 interact with PP1, influencing their function as phosphoproteins.
  • PP1-containing complexes are critical for regulating signaling pathways in neuropathological conditions.
  • The findings suggest a role for BRI2 and BRI3 in neuronal development and potentially in neurodegenerative diseases.