Journal
ANALYTICAL CHEMISTRY
Volume 81, Issue 14, Pages 5699-5708Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac900468j
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Liquid chromatography (LC)-based peptide mapping is extensively used for establishing protein identity, assessing purity, and detecting post-translational modifications (PTMs) of recombinant proteins in the biopharmaceutical industry. However, current LC-UV/MS peptide mapping methods require multiple analyses and MS/MS experiments to identify protein contaminants and site-specific PTMs. This manuscript evaluated an alternative approach for protein characterization via peptide mapping employing a data independent LC-MS acquisition strategy with an alternate low and elevated collision energy scanning. The acquired peptide precursor and fragment information was utilized for effective identification of peptide sequences and site-specific modifications within a single LC run. The peptide MS signal intensities were reliably measured and used to estimate relative concentrations of PTMs and/or proteins contaminating the target protein. The method was evaluated using tryptic digests of yeast enolase and alcohol dehydrogenase. LC-eluted peptides were successfully sequenced and covered 97% target protein sequences. Protein impurities and site-specific modifications (e.g., M-oxidation and N-deamidation) were identified and quantified.
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