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Identification of protein carbonylation sites by two-dimensional liquid chromatography in combination with MALDI- and

Ravi Ch Bollineni1, Ralf Hoffmann, Maria Fedorova

  • 1Institute of Bioanalytical Chemistry, Faculty of Chemistry and Mineralogy, Universität Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany. ravi.bollineni@bbz.uni-leipzig.de

Journal of Proteomics
|July 23, 2011
PubMed

Insights

This study introduces a novel two-dimensional chromatography method to identify specific sites of protein carbonylation, a key biomarker for oxidative stress and aging. The new strategy successfully mapped numerous carbonylation sites in bovine serum albumin and beta-lactoglobulin.

Area of Science:

  • Biochemistry
  • Proteomics
  • Analytical Chemistry

Background:

  • Oxidative stress, caused by excessive reactive oxygen species (ROS), leads to irreversible protein modifications like carbonylation.
  • Carbonylated proteins are crucial biomarkers for oxidative stress, aging, and related diseases.
  • Current methods for studying carbonylated proteins lack site-specific resolution due to low abundance and ionization challenges.

Purpose of the Study:

  • To develop and validate a novel bottom-up strategy for identifying specific carbonylation sites in proteins.
  • To enhance the detection and mapping of oxidative protein modifications.
  • To provide a more precise tool for studying oxidative stress and its pathological implications.

Main Methods:

  • Protein digests were derivatized with 2,4-dinitrophenyl hydrazine (DNPH).
  • A comprehensive two-dimensional hydrophilic interaction chromatography (HILIC) × reversed-phase chromatography (RPC) strategy was employed.
  • Peptide analysis utilized laser-desorption/ionization with DNPH as a reactive matrix and Orbitrap mass spectrometry for tandem MS/MS analysis.

Main Results:

  • The HILIC×RPC strategy successfully identified carbonylation sites in bovine serum albumin (BSA) and β-lactoglobulin (β-LG).
  • Three carbonylation sites were found in native β-LG, nine in native BSA.
  • Eleven sites were identified in oxidized β-LG (oxβ-LG) and 32 in oxidized BSA (oxBSA).

Conclusions:

  • The developed HILIC×RPC method provides a powerful approach for site-specific mapping of protein carbonylation.
  • This strategy significantly advances the ability to study oxidative protein damage and its role in disease.
  • The findings offer a more detailed understanding of oxidative stress-induced protein modifications.

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