Han L, Zhao Y, Zhang Q. Conjugation Site Analysis by MS/MS Protein Sequencing.
Methods Mol Biol 2020;
2078:221-233. [PMID:
31643060 DOI:
10.1007/978-1-4939-9929-3_15]
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Abstract
In-depth knowledge about the site of drug-linker conjugation is important for the understanding of the conjugation efficiency and the exact locations of payloads for antibody-drug conjugates (ADCs). Here we describe a peptide mapping-based protocol, covering sample preparation procedure, LC-MS/MS setup, and data processing (auto and manual), to determine the locations of drug-linker attachment on mAbs. In comparison with classical mAb peptide mapping, some improvements will be highlighted for maintaining hydrophobic drug-loaded peptides in solution, enabling efficient chromatographic separation and mass spectrometric detection, and allowing for their unambiguous identification in LC-MS/MS map by using diagnostic fragmentation ions of the payload.
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