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- W2032157275 abstract "Abstract Recombinant monoclonal antibodies (MAbs) can be heterogeneous due to modifications that can occur during expression, purification or during storage. These large multichain proteins (∼150 kDa) are structurally challenging for detailed characterization to identify the sites of modifications. We report the use of LTQ Orbitrap mass spectrometry to accurately measure the average masses of individual glycoforms by direct infusion of an intact antibody. To identify the site‐specific modification of methionines in the antibody caused by forced oxidation, we used a ‘middle‐down’ approach. The antibody was subjected to limited digestion using the endoproteinase Lys‐C and reduced to generate Fab heavy chain, single chain Fc and light chain fragments (∼25 kDa each). These species were subjected to on‐line liquid chromatography/mass spectrometry/mass spectrometry (LC/MS/MS) analysis using an LTQ Orbitrap, where these large precursors were dissociated by higher‐energy collisions in the C‐trap. High resolution and accuracy achieved for resulting fragments allowed us to show in a site‐specific manner that only the methionines in the Fc heavy chain were oxidized under the studied conditions. Copyright © 2009 John Wiley & Sons, Ltd." @default.
- W2032157275 created "2016-06-24" @default.
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- W2032157275 creator A5050020482 @default.
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- W2032157275 date "2009-11-26" @default.
- W2032157275 modified "2023-10-10" @default.
- W2032157275 title "Structural characterization of intact antibodies by high-resolution LTQ Orbitrap mass spectrometry" @default.
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- W2032157275 doi "https://doi.org/10.1002/jms.1700" @default.
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