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Related Concept Videos

Mass Spectrometry: Overview01:19

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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
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Proteostasis Modelling using Deuterated Water Metabolic Labeling and Data-Independent Acquisition Mass Spectrometry.

Henock M Deberneh, Daniel J Wilkinson, Hannah Crossland

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    This study introduces a new method using labeled water and mass spectrometry to accurately measure protein turnover rates. This technique enhances proteome coverage for studying muscle growth and atrophy.

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    Area of Science:

    • Biochemistry
    • Proteomics
    • Metabolomics

    Background:

    • Protein turnover is crucial for cellular function and adaptation.
    • Accurate quantification of protein turnover is essential for understanding physiological and pathological processes.
    • Existing methods for protein turnover studies have limitations in proteome coverage and accuracy.

    Purpose of the Study:

    • To develop and validate a novel workflow for quantifying protein turnover rates.
    • To integrate deuterated water metabolic labeling with data-independent acquisition (DIA) tandem mass spectrometry (MS/MS).
    • To overcome limitations in fragment ion isotope distribution analysis for accurate deuterium enrichment determination.

    Main Methods:

    • Application of a deuterated water metabolic labeling workflow.
    • Utilizing data-independent acquisition (DIA) tandem mass spectrometry (MS/MS).
    • Automated determination of turnover rates using precursor and fragment ions, employing a two-mass isotopomer approach to address fragment truncation.

    Main Results:

    • Successful quantification of label enrichment in MS/MS for protein turnover studies.
    • Demonstrated increased proteome coverage and depth compared to data-dependent acquisition (DDA).
    • Validated the novel approach in a murine myotube model of muscle hypertrophy and atrophy induced by IGF-1 and dexamethasone.

    Conclusions:

    • The developed workflow provides a robust and accurate method for protein turnover rate determination.
    • DIA-MS/MS coupled with deuterated water labeling significantly enhances proteome-wide protein turnover analysis.
    • This approach offers a valuable tool for investigating dynamic cellular processes like muscle adaptation.