Utilizing ion mobility to identify isobaric post-translational modifications: resolving acrolein and propionyl lysine adducts by TIMS mass spectrometry |
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Authors: | Jose D Gomez Mark E Ridgeway Melvin A Park Kristofer S Fritz |
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Institution: | 1.Skaggs School of Pharmacy and Pharmaceutical Sciences,University of Colorado Anschutz Medical Campus,Aurora,USA;2.Bruker Daltonics,Billerica,USA |
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Abstract: | Protein post-translational modifications provide critical proteomic details towards elucidating mechanisms of altered protein function due to toxic exposure, altered metabolism, or disease pathogenesis. Lysine propionylation is a recently described modification that occurs due to metabolic alterations in propionyl-CoA metabolism and sirtuin depropionylase activity. Acrolein is a toxic aldehyde generated through exogenous and endogenous pathways, such as industrial exposure, cigarette smoke inhalation, and non-enzymatic lipid peroxidation. Importantly, lysine modifications arising from propionylation and acroleination can be isobaric – indistinguishable by mass spectrometry – and inseparable via reverse-phase chromatography. Here, we present the novel application of trapped ion mobility spectrometry (TIMS) to resolve such competing isobaric lysine modifications. Specifically, the PTM products of a small synthetic peptide were analyzed using a prototype TIMS – time-of-flight mass spectrometer (TIMS-TOF). In that the mobilities of these propionylated and acroleinated peptides differ by only 1%, a high-resolution mobility analysis is required to resolve the two. We were able to achieve more than sufficient resolution in the TIMS analyzer (~170), readily separating these isobars. |
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