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• W117268232 abstract "There have been many successful efforts to enrich phosphopeptides in complex protein mixtures by the use of immobilized metal affinity chromatography (IMAC) and/or metal oxide affinity chromatography (MOAC) with which mass spectrometric analysis of phosphopeptides has become state of the art in specialized laboratories, mostly applying nanoLC electrospray ionization mass spectrometry-based investigations. However, widespread use of these powerful techniques is still not achieved. In this study, we present a ready-to-use phosphopeptide enrichment procedure using commercially available TiO 2 -loaded pipette tips in combination with matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) analyses. Using β-casein as a model protein and citric acid as additive during sample loading, a similar enrichment success can be achieved as compared to applying 2,5-dihydroxy benzoic acid (DHB) for this task. But the DHB-inherited drawbacks are eliminated. In addition, we show that combining DHB and 2,4,6-trihydroxy acetophenone (THAP) as matrix for MALDI-MS measurements retains the sensitivity of DHB for phosphopeptide analysis but adds the homogenous crystallization properties of THAP, enabling preparation of evenly distributed matrix surfaces on MALDI-MS anchor targets, a prerequisite for automated MALDI-MS analyses. Tripartite motif-containing protein 28 and stathmin are two examples for which successful phosphopeptide enrichment of either sodium dodecyl sulfate polyacrylamide gel electrophoresis or two-dimensional gel electrophoresis-separated proteins is shown. Finally, high resolution MALDI Fourier transform ion cyclotron resonance mass spectrometry after phosphopeptide enrichment suggests that chemical dephosphorylation may occur as a side reaction during basic elution of phosphopeptides bound to MOAC surfaces, suggesting that proteome-wide phosphopeptide analyses ought to be interpreted with caution. In contrast, in-depth analysis of phosphopeptide/non-phosphorylated peptide siblings may be used to estimate stability differences of phosphorylation sites in individual proteins, possibly adding valuable information on biological regulation processes." @default.
• W117268232 created "2016-06-24" @default.
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• W117268232 date "2011-10-01" @default.
• W117268232 modified "2023-09-27" @default.
• W117268232 title "Systematic Studies on TiO₂-Based Phosphopeptide Enrichment Procedures upon in-Solution and in-Gel Digestions of Proteins. Are There Readily Applicable Protocols Suitable for Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry-Based Phosphopeptide Stability Estimations?" @default.
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• W117268232 doi "https://doi.org/10.1255/ejms.1134" @default.
• W117268232 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22173543" @default.
• W117268232 hasPublicationYear "2011" @default.
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