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• W2080646736 abstract "Transthyretin (TTR) amyloidosis and hemoglobinopathies are the archetypes of molecular diseases where point mutation characterization is diagnostically critical. We have developed a top-down analytical platform for variant and/or modified protein sequencing and are examining the feasibility of using this platform for the analysis of hemoglobin/TTR patient samples and evaluating the potential clinical applications. The platform is based on a commercial high resolution hybrid orbitrap mass spectrometer (LTQ-Orbitrap™) with automated sample introduction; automated data analysis is performed by our own software algorithm (BUPID top-down). The analytical strategy consists of iterative data capture, first recording a mass profile of the protein(s). The presence of a variant is revealed by a mass shift consistent with the amino acid substitution. Nozzle-skimmer dissociation (NSD) of the protein(s) yields a wide variety of sequence-defining fragment ions. The fragment ion containing the amino acid substitution or modification can be identified by searching for a peak exhibiting the mass shift observed in the protein mass profile. This fragment ion can then be selected for MS/MS analysis in the ion trap to yield sequence information permitting the identification of the variant. Substantial sequence coverage has been obtained in this manner. This strategy allows for a stepwise MS/MS analysis of the protein structure. The sequence information obtained can be supplemented with whole protein NSD fragmentation and MS/MS analysis of specific protein charge states. The analyses of variant forms of TTR and hemoglobin are presented to illustrate the potential of the method." @default.
• W2080646736 created "2016-06-24" @default.
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• W2080646736 date "2011-03-01" @default.
• W2080646736 modified "2023-10-06" @default.
• W2080646736 title "Top-down analysis of small plasma proteins using an LTQ-Orbitrap. Potential for mass spectrometry-based clinical assays for transthyretin and hemoglobin" @default.
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• W2080646736 doi "https://doi.org/10.1016/j.ijms.2010.08.012" @default.
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