Identification of Novel Site‐Specific Alterations in the Modification Level of Myelin Basic Protein Isolated from Mouse Brain at Different Ages Using Capillary Electrophoresis–Mass Spectrometry. Issue 19 (9th October 2017)

• Record Type: Journal Article
• Authors: Sarg, Bettina; Faserl, Klaus; Lindner, Herbert H.
• Is Part Of: Proteomics. Volume 17:Issue 19(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-10-09
• Subjects: capillary electrophoresis–mass spectrometry -- citrullination -- deamidation -- isomerization -- myelin basic protein; Proteins -- Separation -- Periodicals; Bioinformatics -- Periodicals; Proteomics -- Periodicals; Genomes -- Periodicals; Molecular genetics -- Periodicals; 572.605
• DOI: 10.1002/pmic.201700269
• Languages: English
• ISSNs: 1615-9853

Abstract

Abstract: Myelin basic protein (MBP) is a multifunctional protein involved in maintaining the stability and integrity of the myelin sheath by a variety of interactions with membranes and other proteins. MBP is subjected to extensive posttranslational modifications (PTMs) that are known to be crucial for the regulation of these interactions. Here, we report capillary electrophoresis–mass spectrometric (CE–MS) analysis for the separation and identification of MBP peptides that incorporate the same PTM at different sites, creating multiple localization variants, and the ability to analyze challenging modifications such as asparagine and glutamine deamidation, isomerization, and arginine citrullination. Moreover, we observed site‐specific alterations in the modification level of MBP purified from brain of mice of different age. In total, we identified 40 modifications at 33 different sites, which include both previously reported and seven novel modifications. The identified modifications include Nα‐terminal acetylation, mono‐ and dimethylation, phosphorylation, oxidation, deamidation, and citrullination. Notably, some new sites of arginine methylation overlap with the sites of citrullination. Our results highlight the need for sensitive and efficient techniques for a comprehensive analysis of PTMs.