C-terminal de novo sequencing of peptides using oxazolone-based derivatization with bromine signature |
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Authors: | Kim Jong-Seo Shin Mansup Song Jin-Su An Songhie Kim Hie-Joon |
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Institution: | Department of Chemistry, Seoul National University, Seoul 151-742, Republic of Korea |
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Abstract: | Due to almost identical chemical properties of C-terminal and side-chain carboxylic groups, selective C-terminal derivatization has been difficult. Although oxazolone-based C-terminal derivatization is the only selective C-terminal modification available, it has not been used widely because of its low derivatization efficiency. In this paper, an improved oxazolone chemistry for incorporation of Br signature to C-terminus is reported. MS/MS analysis of the brominated peptides led to a series of y ions with Br signature, facilitating de novo C-terminal sequencing. |
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Keywords: | Br signature De novo sequencing C-terminal Derivatization Oxazolone |
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