Quantification of Methylation and Phosphorylation Stoichiometry.

Area of Science:

• Neuroscience
• Biochemistry
• Molecular Biology

Background:

• Tauopathies, including Alzheimer's disease (AD), involve the aggregation of Tau protein.
• Post-translational modifications (PTMs) of Tau are implicated in its aggregation and function.
• Understanding Tau PTM stoichiometry is vital for assessing their impact.

Purpose of the Study:

• To develop rapid in vitro methods for producing recombinant Tau with high-stoichiometry, enzyme-specific PTMs.
• To present protocols for quantifying Tau phosphorylation and methylation stoichiometry in isolated Tau proteins.
• To facilitate experimental investigation of Tau PTMs' functional roles.

Main Methods:

• Enzyme-specific PTMs were introduced to recombinant Tau in vitro at high stoichiometry.
• Protocols were established for estimating phosphorylation and methylation stoichiometry on Tau.
• Methods were validated using hyperphosphorylated Tau.

Main Results:

• A protocol for rapid, high-stoichiometry recombinant Tau PTM production was successfully developed.
• Quantification methods for Tau phosphorylation and methylation stoichiometry were established.
• The utility of these methods was demonstrated in the context of Tau hyperphosphorylation.

Conclusions:

• The developed methods enable efficient production and characterization of Tau PTMs.
• These tools support in-depth studies on the functional consequences of Tau PTMs.
• The research provides a foundation for investigating Tau PTMs in various experimental settings.