Abstract
Mass spectrometric analysis of N-terminal peptides reveals altered amino acid sequences at the protein's N-terminus and the presence of posttranslational modifications (PTM). Recent advancement in enriching N-terminal peptides facilitates the discovery of rare N-terminal PTMs in samples with restricted availability. In this chapter, we describe a simple, single-stage oriented N-terminal peptide enrichment method that helps the overall sensitivity of N-terminal peptides. In addition, we describe how to increase the depth of identification, to use software to identify and quantify N-terminally arginylated peptides.
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