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• W2023802227 abstract "The following analytical methods have been used to identify and quantify degradation products in an E. coli expressed human immunoglobulin G Fc fusion protein in both liquid and lyophilized forms: two-dimensional AEX/RP/MS, limited proteolysis followed by LC/MS, and tryptic digestion followed by LC/MS/MS. After aging in a potassium phosphate pH 7.0 buffer for 3 months at 29 °C, peptide map analysis revealed that asparagine N78 (N297 according to Edelman sequencing) of the CH2 domain was the most rapidly deamidated site in the molecule probably due to the lack of the N-linked glycan on this asparagine, but this deamidation can be prevented under properly formulated conditions. This is the first report on the rate of deamidation on N297 of an IgG molecule without glycosylation. The active protein portion of the Fc fusion protein contains two methionine residues that are potentially susceptible to oxidation. Limited proteolysis was employed to cleave the active protein portion and measure the amount of oxidation. LC/MS analysis identified that the liquid sample aged at 29 °C for 3 months produced 40% oxidation, while the control sample contained only 4% oxidation on the active protein. In contrast to the aged liquid sample, the aged lyophilized sample showed no increase of deamidation or oxidation after storage at 37 °C for 8 months." @default.
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• W2023802227 date "2009-01-01" @default.
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• W2023802227 title "Degradation products analysis of an Fc fusion protein using LC/MS methods" @default.
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• W2023802227 doi "https://doi.org/10.1016/j.ijbiomac.2008.10.006" @default.
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