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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.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
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Phosphorylation01:02

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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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Peptide Identification Using Tandem Mass Spectrometry01:33

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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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Identification of Post-translational Modifications of Plant Protein Complexes
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Proteoform-Resolved Phosphorylation Dynamics in Kinase Complexes by Hybrid Precision Mass Spectrometry.

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    This study introduces a hybrid mass spectrometry (MS) approach to analyze protein phosphorylation dynamics in kinase complexes. The method reveals coordinated autophosphorylation cascades and proteoform patterns in AMP-activated protein kinase (AMPK).

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Proteomics

    Background:

    • Protein phosphorylation generates diverse proteoforms, but analyzing their temporal dynamics and combinatorial patterns is challenging.
    • Understanding phosphorylation is crucial for kinase regulation and cellular signaling pathways.

    Purpose of the Study:

    • To develop and apply an integrated mass spectrometry (MS) strategy for resolving phosphorylation dynamics within intact kinase complexes.
    • To characterize the proteoform landscape and kinetic hierarchies of AMP-activated protein kinase (AMPK) activation.

    Main Methods:

    • A hybrid precision mass spectrometry (MS) strategy combining intact mass measurements, bottom-up MS, and top-down MS sequencing.
    • Analysis of AMP-activated protein kinase (AMPK) as a model system to study phosphorylation cascades.
    • Investigating phosphatase competition effects on specific phosphorylation sites.

    Main Results:

    • Uncovered coordinated autophosphorylation cascades in AMPK with kinetic hierarchies, identifying α1-S496 as highly efficient.
    • Demonstrated allosteric activation bypassing canonical phosphorylation sites, enabling autophosphorylation in mutants.
    • Identified a predominant β1 proteoform with specific double phosphorylation linked to distribution and responsiveness.
    • Showed selective removal of activation-loop phosphorylation by PP1A while autophosphorylation sites were protected.

    Conclusions:

    • The integrated MS strategy effectively resolves complex phosphorylation dynamics in intact kinase complexes.
    • Revealed novel insights into AMPK activation mechanisms, including kinetic hierarchies and allosteric regulation.
    • Provides a versatile framework for studying phosphorylation-based regulation in various kinase systems.