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A Streamlined Approach for Mass Spectrometry-Based Proteomics Using Selected Tissue Regions
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Proteoform-Selective Imaging of Tissues Using Mass Spectrometry.

Manxi Yang1, Hang Hu1, Pei Su1,2

  • 1Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA.

Angewandte Chemie (International Ed. in English)
|April 21, 2022
PubMed
Summary
This summary is machine-generated.

Nanospray desorption electrospray ionization mass spectrometry imaging (nano-DESI MSI) enables proteoform-specific tissue analysis. This new method reveals distinct protein variant patterns across different brain regions in rats.

Keywords:
Mass Spectrometry ImagingOn-Tissue Top-down ProteomicsPost-Translational ModificationsProteoforms

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Neuroscience

Background:

  • Understanding complex biological systems requires advanced proteomic analysis techniques.
  • Spatially resolved proteoform-specific analysis is crucial for detailed biological insights.

Purpose of the Study:

  • To introduce and validate nanospray desorption electrospray ionization mass spectrometry imaging (nano-DESI MSI) for proteoform-selective tissue imaging.
  • To demonstrate the capability of nano-DESI MSI for on-tissue top-down proteomics.

Main Methods:

  • Utilized nano-DESI MSI for direct tissue analysis.
  • Employed tandem mass spectrometry (MS/MS) for structural characterization of protein ions.
  • Applied on-tissue top-down proteomics for proteoform identification.

Main Results:

  • Nano-DESI MSI successfully generated multiply charged protein ions suitable for structural analysis.
  • Proof-of-concept experiments confirmed the suitability of nano-DESI MSI for proteoform-selective imaging.
  • Demonstrated differential proteoform expression in distinct regions of rat brain tissue.

Conclusions:

  • Nano-DESI MSI is a powerful tool for spatially resolved, proteoform-specific proteomic analysis.
  • This technique advances the study of tissue heterogeneity and regional differences in protein expression.