Summary
Methylated lysines (Nɛ-mono-methylated, Nɛ-di-methylated and Nɛ-tri-methylated) have been identified after derivatization with orthophthaldialdehyde (OPA) by using pre-column and post-column derivatization techniques.
Also the Nɛ-acetylated lysine and Nɛ-formylated lysine have been identified by OPA post-column derivatization techniques but only in free form due to their instability under acidic conditions which are used for protein hydrolysis.
Additionally, all the modified amino acids mentioned above have been derivatized with DABITC/PITC, an Edman reagent, and identified as DABTH-derivatives on thin-layer polyamide sheets.
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Tsiboli, P., Konstantinidis, G., Skendros, Y. et al. Identification of post-translational modified amino acids. Amino Acids 13, 13–23 (1997). https://doi.org/10.1007/BF01373045
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DOI: https://doi.org/10.1007/BF01373045