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Cell-based Calcium Assay for Medium to High Throughput Screening of TRP Channel Functions using FlexStation 3

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A practical guide to the FLEXIQuant method.

Sasha Singh¹, Marc Kirchner, Judith A Steen

¹Department of Pathology, Children's Hospital Boston and Harvard Medical School, Boston, MA, USA.

Methods in Molecular Biology (Clifton, N.J.)

|June 6, 2012

Summary

This summary is machine-generated.

Researchers developed a novel FLEXIQuant standard for accurate protein quantification. This method enables unbiased identification and quantification of posttranslational modifications (PTMs) in complex biological samples using mass spectrometry (MS).

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Area of Science:

Proteomics
Biochemistry
Mass Spectrometry

Background:

Protein molecules exist as heterogeneous populations of posttranslationally modified forms, often uncharacterized due to detection limitations.
Investigating these posttranslational modifications (PTMs) is crucial for understanding protein function and biological states.

Purpose of the Study:

To develop a method for the unbiased identification and quantification of posttranslational modifications (PTMs) in proteins.
To establish an internal standard for enhanced protein quantification and PTM analysis using mass spectrometry (MS).

Main Methods:

Development of a full-length expressed protein quantification standard (FLEXIQuant standard), synthesized in vitro and lacking PTMs.
Integration of the FLEXIQuant standard into protein purification workflows alongside the endogenous protein.
Utilizing mass spectrometry (MS) for enhanced detection and quantification of peptides and their modifications.

Main Results:

The FLEXIQuant standard serves as an effective internal MS standard for protein quantification.
Enables unbiased identification of peptides undergoing PTMs in relation to specific biological states.
Quantifies the extent of PTMs, offering deeper insights into protein regulation.

Conclusions:

FLEXIQuantification provides a robust approach for characterizing heterogeneous protein populations.
This method significantly advances the study of PTMs and their role in biological regulation.
Facilitates a more comprehensive understanding of protein dynamics in various biological contexts.