Abstract
Protein N-termini provide unique and distinguishing information on proteolytically processed or N-terminally modified proteoforms. Also splicing, use of alternative translation initiation sites, and a variety of co- and post-translational N-terminal modifications generate distinct proteoforms that are unambiguously identified by their N-termini. However, N-terminal peptides are only a small fraction among all peptides generated in a shotgun proteome digest, are often of low stoichiometric abundance, and therefore require enrichment. Various protocols for enrichment of N-terminal peptides have been established and successfully been used for protease substrate discovery and profiling of N-terminal modification, but often require large amounts of proteome. We have recently established the High-efficiency Undecanal-based N-Termini EnRichment (HUNTER) as a fast and sensitive method to enable enrichment of protein N-termini from limited sample sources with as little as a few microgram proteome. Here we present our current HUNTER protocol for sensitive plant N-terminome profiling, including sample preparation, enrichment of N-terminal peptides, and mass spectrometry data analysis.
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Acknowledgments
This work was in part supported by funding from the Deutsche Forschungsgemeinschaft DFG (project SFB-1403–414786233).
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Demir, F., Perrar, A., Mantz, M., Huesgen, P.F. (2022). Sensitive Plant N-Terminome Profiling with HUNTER . In: Klemenčič, M., Stael, S., Huesgen, P.F. (eds) Plant Proteases and Plant Cell Death. Methods in Molecular Biology, vol 2447. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2079-3_12
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DOI: https://doi.org/10.1007/978-1-0716-2079-3_12
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