Abstract
The principal objective of this study was the evaluation of two-dimensional gel electrophoresis (2-DE) in combination with MALDI-TOF MS, after tryptic digest with regard to suitability for qualitative characterization and identification of therapeutic recombinant monoclonal antibodies trastuzumab and rituximab. Moreover, the impact of post-translational modifications of these glycoproteins on the electrophoresis behavior has been evaluated. 1-D SDS-PAGE, in reducing and non-reducing conditions, and 2-DE were used for the assessment of M(r) and the monitorization of deglycosylation efficiency. In addition, 2-DE was used for the determination of pIs. 2-DE gels revealed characteristic glycoprotein migration behavior, highly complex spot pattern, typical for recombinant monoclonal antibodies. N-linked oligosaccharides were released with PNGase F; enzymatic desialination was studied with sialidase and carboxypeptidase B was used for the study of lysine truncation. Peptide spots resolved in 2-DE gels were in gel tryptically digested, resulting peptides were subjected to MALDI-TOF MS analysis and peptide mass fingerprinting (PMF) has been used for the identity confirmation of both monoclonal antibodies.
Copyright © 2011 Elsevier B.V. All rights reserved.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Antibodies, Monoclonal / analysis
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Antibodies, Monoclonal / chemistry*
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Antibodies, Monoclonal / metabolism
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Antibodies, Monoclonal, Humanized / analysis
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Antibodies, Monoclonal, Humanized / chemistry*
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Antibodies, Monoclonal, Humanized / metabolism
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Antibodies, Monoclonal, Murine-Derived / analysis
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Antibodies, Monoclonal, Murine-Derived / chemistry*
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Antibodies, Monoclonal, Murine-Derived / metabolism
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Antineoplastic Agents / analysis
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Antineoplastic Agents / chemistry*
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Antineoplastic Agents / metabolism
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Electrophoresis, Gel, Two-Dimensional / methods
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Glycoproteins / analysis
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Glycoproteins / metabolism
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Humans
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Oligosaccharides / analysis
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Oligosaccharides / metabolism
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Peptide Mapping
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Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase / analysis
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Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase / metabolism
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Peptides / analysis
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Peptides / metabolism
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Protein Processing, Post-Translational
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Recombinant Proteins / analysis
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Recombinant Proteins / metabolism
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Rituximab
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Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / methods*
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Trastuzumab
Substances
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Antibodies, Monoclonal
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Antibodies, Monoclonal, Humanized
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Antibodies, Monoclonal, Murine-Derived
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Antineoplastic Agents
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Glycoproteins
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Oligosaccharides
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Peptides
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Recombinant Proteins
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Rituximab
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Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase
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Trastuzumab