Related ArticlesUnambiguous characterization of N-glycans of monoclonal antibody cetuximab by integration of LC-MS/MS and ¹H NMR spectroscopy.
Anal Chem. 2014 May 20;86(10):4807-14
Authors: Wiegandt A, Meyer B
Abstract
Monoclonal antibodies are most rapidly emerging as therapeutic drugs for the treatment of cancer and of various other diseases such as autoimmunity or inflammation. Recently, it was found that nonhuman glycosylation of recombinant antibodies can cause tremendous problems for some patients. Therefore, unambiguous assignment of the glycosylation pattern of therapeutic antibodies is of high importance for assessment of human compatibility. Here we present results from a broad and detailed N-glycan analysis of the therapeutic antibody cetuximab by LC-MS/MS analyses tightly integrated with (1)H NMR to obtain unambiguous structures. Thirty-seven N-glycan compositions were identified by LC-MS(/MS). Subsequently, ten abundant structures were structurally characterized by applying the recently introduced method called three-dimensional cross correlation (3DCC). It was possible to extract NMR spectra of pure N-glycans that were heavily overlapping in a chromatographic separation by mathematically dissecting the NMR spectra obtained from chromatographic fractions. Even mass isobaric structures that differ only in the branching position of one monosaccharide unit were distinguished and characterized. We also developed an improvement of the 3DCC method by introducing singular value decomposition (SVD) for processing of the data. The smallest amount of the N-glycan characterized by 3DCC was approximately 400 pmol (836 ng). Among the ten unambiguously identified glycans, six N-glycans, representing 24% of all detected glycans, possess the immunogenic ?-1,3-Gal epitope and/or N-glycolylneuraminic acid. These results illustrate the importance of integrated use of LC-MS(/MS) and (1)H NMR for the glycome analysis of biopharmaceuticals in research, development, and quality control.
[NMR paper] Unambiguous Assignment of Short- and Long-Range Structural Restraints by Solid-State NMR Spectroscopy with Segmental Isotope Labeling.
Unambiguous Assignment of Short- and Long-Range Structural Restraints by Solid-State NMR Spectroscopy with Segmental Isotope Labeling.
Related Articles Unambiguous Assignment of Short- and Long-Range Structural Restraints by Solid-State NMR Spectroscopy with Segmental Isotope Labeling.
Chembiochem. 2014 Nov 12;
Authors: Schubeis T, Lührs T, Ritter C
Abstract
We present an efficient method for the reduction of spectral complexity in the solid-state NMR spectra of insoluble protein assemblies, without loss of signal intensity....
[NMR paper] Profiling Formulated Monoclonal Antibodies by 1H NMR Spectroscopy.
Profiling Formulated Monoclonal Antibodies by 1H NMR Spectroscopy.
Profiling Formulated Monoclonal Antibodies by 1H NMR Spectroscopy.
Anal Chem. 2013 Sep 5;
Authors: Poppe L, Jordan JB, Lawson K, Jerums M, Apostol I, Schnier PD
Abstract
Nuclear magnetic resonance (NMR) is arguably the most direct methodology for characterizing the higher-order structure of proteins in solution. Structural characterization of proteins by NMR typically utilizes heteronuclear experiments. However, for formulated monoclonal antibody (mAb) therapeutics, the...
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09-07-2013 09:54 PM
2. NMR spectroscopy - Integration
2. NMR spectroscopy - Integration
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2. NMR spectroscopy - Integration
Visit www.chemistry.jamesmungall.co.uk for notes on this topic. Thanks for watching! This video explains how integration tells you the number of hydrogen atoms each peak corresponds to. Discussion of how this can be useful in determining structure. Part of a set of videos giving an introductory course on proton NMR, aimed at around A-level or International Baccalaureate standard. Includes dicussion of integration, chemical shift and coupling.
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07-12-2011 08:26 PM
Structure Calculation from Unambiguous Long-Range Amide and Methyl (1)H-(1)H Distance Restraints for a Microcrystalline Protein with MAS Solid-State NMR Spectroscopy.
Structure Calculation from Unambiguous Long-Range Amide and Methyl (1)H-(1)H Distance Restraints for a Microcrystalline Protein with MAS Solid-State NMR Spectroscopy.
Structure Calculation from Unambiguous Long-Range Amide and Methyl (1)H-(1)H Distance Restraints for a Microcrystalline Protein with MAS Solid-State NMR Spectroscopy.
J Am Chem Soc. 2011 Mar 24;
Authors: Linser R, Bardiaux B, Higman V, Fink U, Reif B
Magic-angle spinning (MAS) solid-state NMR becomes an increasingly important tool for the determination of structures of membrane...
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03-26-2011 07:00 PM
Structure Calculation from Unambiguous Long-Range Amide and Methyl 1H-1H Distance Restraints for a Microcrystalline Protein with MAS Solid-State NMR Spectroscopy
Structure Calculation from Unambiguous Long-Range Amide and Methyl 1H-1H Distance Restraints for a Microcrystalline Protein with MAS Solid-State NMR Spectroscopy
Rasmus Linser, Benjamin Bardiaux, Victoria Higman, Uwe Fink and Bernd Reif
http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/0/jacsat.ahead-of-print/ja110222h/aop/images/medium/ja-2010-10222h_0004.gif
Journal of the American Chemical Society
DOI: 10.1021/ja110222h
http://feeds.feedburner.com/~ff/acs/jacsat?d=yIl2AUoC8zA
http://feeds.feedburner.com/~r/acs/jacsat/~4/Dh0EBf8PwcY
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03-24-2011 08:02 PM
[NMR paper] Epitope mapping of gibberellin to the anti-gibberellin A(4) monoclonal antibody by sa
Epitope mapping of gibberellin to the anti-gibberellin A(4) monoclonal antibody by saturation transfer difference NMR spectroscopy.
Related Articles Epitope mapping of gibberellin to the anti-gibberellin A(4) monoclonal antibody by saturation transfer difference NMR spectroscopy.
Biochem Biophys Res Commun. 2003 Aug 1;307(3):498-502
Authors: Murata T, Hemmi H, Nakajima M, Yoshida M, Yamaguchi I
Saturation transfer difference (STD) NMR spectroscopy is a promising tool for rapid screening, identifying ligands that interact with a target protein,...
Unambiguous characterization of N-glycans of monoclonal antibody cetuximab by integration of LC-MS/MS and ¹H NMR spectroscopy.
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