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Related Concept Videos

Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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Recombinant α- β- and γ-Synucleins Stimulate Protein Phosphatase 2A Catalytic Subunit Activity in Cell Free Assays
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Protein Phosphatase 2B Dual Function Facilitates Synaptic Integrity and Motor Learning.

Zhanmin Lin1, Bin Wu1,2, Maarten W Paul3

  • 1Department of Neuroscience, Erasmus MC, 3015 GE, Rotterdam, The Netherlands.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 22, 2021
PubMed
Summary

Protein phosphatase 2B (PP2B) is crucial for motor learning, acting both enzymatically and structurally at cerebellar Purkinje cell synapses. Its dual function impacts synaptic plasticity and synapse integrity, essential for learning.

Keywords:
Purkinje cellscerebellar learningprotein phosphatase 2B

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Synaptic Plasticity

Background:

  • Protein phosphatase 2B (PP2B) is vital for synaptic plasticity and learning.
  • The precise molecular mechanisms underlying PP2B's role are not fully understood.

Purpose of the Study:

  • To investigate the molecular mechanisms of PP2B in synaptic plasticity and motor learning.
  • To determine the distinct roles of PP2B's enzymatic and structural functions.

Main Methods:

  • Identified proteins interacting with PP2B in mouse Purkinje cells.
  • Utilized genetic deletion and reexpression of PP2B (wild-type and inactive forms).
  • Assessed postsynaptic density (PSD) protein expression, PSD thickness, nanocluster distribution, and glutamate receptor mobility.

Main Results:

  • PP2B interacts with structural PSD proteins in Purkinje cells.
  • PP2B deletion reduced PSD protein expression and PSD thickness.
  • PP2B's enzymatic activity regulated glutamate receptor mobility, while its structural role influenced synapse integrity.
  • Motor learning correlated with both enzymatic and structural PP2B functions.

Conclusions:

  • PP2B plays a dual role in synaptic function and motor learning.
  • It acts as a phosphatase regulating receptor mobility and as a structural protein maintaining synapse integrity.
  • These complementary functions are essential for cerebellar learning.