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Related Concept Videos

Proteomics01:33

Proteomics

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A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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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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Large-scale Top-down Proteomics Using Capillary Zone Electrophoresis Tandem Mass Spectrometry
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Top-Down Mass Spectrometry-Based Structural and Functional Proteomics: A Perspective.

Kellye A Cupp-Sutton1, Si Wu1

  • 1Department of Chemistry and Biochemistry, University of Alabama, Tuscaloosa, Alabama, USA.

Journal of Mass Spectrometry : JMS
|March 18, 2026
PubMed
Summary
This summary is machine-generated.

Top-down proteomics analyzes intact protein structures, overcoming limitations of traditional methods. This approach preserves crucial details about protein modifications (PTMs) and their impact on biological function and disease.

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Area of Science:

  • Structural Proteomics
  • Mass Spectrometry
  • Molecular Biology

Background:

  • Protein modifications (PTMs) create diverse proteoforms essential for cellular regulation and homeostasis.
  • Understanding proteoform structure is key to elucidating biological functions and disease mechanisms.
  • Traditional structural methods struggle to analyze proteoform heterogeneity.

Purpose of the Study:

  • To discuss the application of top-down mass spectrometry (MS)-based proteomics for interrogating intact proteoform structures.
  • To highlight the potential of top-down structural proteomics as a complementary approach to existing strategies.
  • To outline future directions for advancing top-down structural proteomics.

Main Methods:

  • Utilizes top-down mass spectrometry (MS) to analyze intact proteoforms directly, preserving structural information.
  • Contrasts top-down MS with bottom-up proteomics, which involves protein digestion.
  • Compares MS-based methods with traditional structural biology techniques (NMR, cryo-EM, X-ray crystallography).

Main Results:

  • Top-down proteomics preserves the connectivity between proteoform structure and function, unlike bottom-up approaches.
  • Top-down MS can evaluate protein structure under native or native-like conditions.
  • This method avoids peptide digestion, preventing the loss of information on coordinating PTMs.

Conclusions:

  • Top-down structural proteomics offers a powerful method for comprehensive characterization of the intact structural proteome.
  • It complements bottom-up proteomics and traditional biochemical strategies for a holistic understanding of proteoforms.
  • Advancements in top-down MS are crucial for future structural proteomic studies.