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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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Microsampling in Targeted Mass Spectrometry-Based Protein Analysis of Low-Abundance Proteins
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Magnetic bead-based peptide extraction methodology for tissue imaging.

William T Andrews1, Susan B Skube, Amanda B Hummon

  • 1Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, IN 46556, USA. ahummon@nd.edu.

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|November 10, 2017
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Summary
This summary is machine-generated.

This study introduces magnetic bead-based active extraction to isolate peptides from tissue samples for MALDI-TOF IMS analysis. The method minimizes contaminants and preserves peptide spatial localization for enhanced detection.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Proteomics

Background:

  • MALDI-TOF imaging mass spectrometry (IMS) is crucial for simultaneous analyte detection in tissues.
  • Ion suppression from contaminants can hinder analyte analysis in MALDI-TOF IMS.
  • Selective active extraction is needed to isolate target analytes without losing spatial information.

Purpose of the Study:

  • To develop a magnetic bead-based active extraction technique for selective peptide isolation from tissue samples.
  • To ensure the preservation of peptide spatial localization during the extraction process.
  • To improve analyte detection in MALDI-TOF IMS by minimizing contaminants.

Main Methods:

  • Utilized magnetic beads functionalized with a heterobifunctional cross-linker.
  • Covalently bound peptides with primary amine groups to magnetic beads.
  • Collected bound peptides using a transfer magnet for subsequent MALDI-TOF IMS analysis.

Main Results:

  • Successfully isolated peptides in-solution and on solid surfaces.
  • Demonstrated peptide extraction from tissue sections with minimal compromise to spatial localization.
  • Identified a unique subset of peptides compared to unextracted samples, with reduced contaminants.

Conclusions:

  • The magnetic bead-based active extraction method effectively isolates peptides from tissues.
  • This technique enhances peptide detection via MALDI-TOF IMS by reducing ion suppression and maintaining spatial information.
  • Offers a novel approach for targeted peptide analysis in complex biological samples.