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Related Concept Videos

Matrix-Assisted Laser Desorption Ionization (MALDI)01:08

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Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI is an ionization technique, widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix...
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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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MALDI imaging directed laser ablation tissue microsampling for data independent acquisition proteomics.

Kelin Wang1, Fabrizio Donnarumma1, Michael E Pettit2

  • 1Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, United States.

Journal of Mass Spectrometry : JMS
|November 15, 2019
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Summary

This study introduces a new multimodal workflow combining MALDI imaging with LC-MS/MS for detailed protein analysis in tissue. The method successfully identified over 600 proteins and 14 MALDI imaging peaks, advancing mass spectrometry imaging capabilities.

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Area of Science:

  • Biochemistry
  • Proteomics
  • Analytical Chemistry

Background:

  • Mass spectrometry imaging (MSI) provides spatial distribution of molecules in tissues.
  • Combining MSI with protein identification offers deeper biological insights.
  • Existing workflows can be complex and time-consuming.

Purpose of the Study:

  • To develop and validate a multimodal workflow integrating MALDI imaging with LC-MS/MS.
  • To enable precise identification and quantification of proteins directly from tissue sections.
  • To enhance protein identification by incorporating modified databases.

Main Methods:

  • Tissue sections analyzed by MALDI mass spectrometry imaging (MALDI MSI).
  • Regions of interest (ROI) isolated using a 3-μm midinfrared laser.
  • Protein extraction and processing via single-pot solid-phase-enhanced sample preparation (SP3).
  • Liquid chromatography tandem mass spectrometry (LC-MS/MS) with ion mobility (IM) enhanced data independent acquisition (DIA) for protein analysis.

Main Results:

  • Successfully identified over 600 proteins within the analyzed tissue sections.
  • Identified 14 MALDI MSI peaks by utilizing a modified database including isoforms and post-translational modifications.
  • Enabled comparative analysis of Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways.

Conclusions:

  • The developed multimodal workflow is effective for comprehensive protein analysis in tissues.
  • This approach enhances the depth and accuracy of protein identification in MALDI MSI studies.
  • The workflow facilitates deeper understanding of spatial proteomics and associated biological pathways.