A tandem mass spectrometric approach to the identification of O‐glycosylated glargine glycoforms in active pharmaceutical ingredient expressed in Pichia pastoris |
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Authors: | Vivekanandan Kannan Pradeep Narayanaswamy Deepak Gadamsetty Partha Hazra Anand Khedkar Harish Iyer |
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Affiliation: | Research and Development, Biocon Limited, 20th KM Hosur Road, 560100 Bangalore, India |
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Abstract: | Glycoforms of glargine expressed in Pichia pastoris were isolated by high‐performance liquid chromatography and analyzed by a series of chemical and mass spectrometric methods for the identification of various glycoforms, glycosylation position, nature and structure of glycans. Reduction and alkylation, peptide mapping techniques were used to decipher the amino acid site at which glycosylation had taken place. Chemical methods were coupled with mass spectrometry techniques such as electrospray ionization and matrix‐assisted laser desorption/ionization for identification of the glycosylation site. Copyright © 2009 John Wiley & Sons, Ltd. |
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