Detection of Proteoforms Using Top-Down Mass Spectrometry and Diagnostic Ions
Didia Coelho Graça1,2, Ralf Hartmer3, Wolfgang Jabs4
1Clinical Proteomics and Chemistry Group, Faculty of Medicine, University of Geneva, Geneva, Switzerland. didia.coelhograca@hcuge.ch.
Abstract:
Characterization of protein structure modifications is an important field in mass spectrometry (MS)-based proteomics. Here, we describe a process to quickly and reliably identify a mass change in a targeted protein sequence by top-down mass spectrometry (TD MS) using electron transfer dissociation (ETD). The step-by-step procedure describes how to develop a TD MS method for data acquisition as well as the data analysis process. The described TD MS workflow utilizes diagnostic ions to characterize an unknown sample in a few hours.
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