Accurate Quantification of N-Glycolylneuraminic Acid in Therapeutic Proteins Using Supramolecular Mass Spectrometry

Journal of the American Chemical Society
Hyun Hee L LeeHugh I Kim

Abstract

Practical applications of innovative host-guest systems are challenging because of unexpected guest competitors and/or subtle environmental differences. Herein, a supramolecular mass spectrometry (MS)-based method using a synthetic host, cucurbit[7]uril (CB[7]), was developed for identifying and quantifying N-glycolylneuraminic acid (Neu5Gc) in therapeutic glycoproteins, which critically reduces drug efficacy. The development of a reliable derivatization-free analytical method for Neu5Gc is highly challenging because of the interference by the abundant N-acetylneuraminic acid (Neu5Ac). CB[7] recognized the subtle structural differences between Neu5Gc and Neu5Ac. Distinct host-guest interactions between CB[7] and the two sialic acids produced a highly linear relationship between the complexation and concentration proportions of the two sialic acids in MS. Furthermore, the developed method had sub-picomolar quantification limits and a wide range of applicability for diverse glycoproteins, demonstrating the potential utility of this method as a reliable assay of Neu5Gc in therapeutic glycoproteins.

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Citations

Nov 19, 2019·Chemical Communications : Chem Comm·Ranjan SasmalSarit S Agasti
Sep 12, 2020·Journal of Separation Science·Bastiaan L DuivelshofValentina D'Atri
Sep 18, 2020·Molecular & Cellular Proteomics : MCP·Nicholas M RileySharon J Pitteri
Feb 16, 2021·Molecular & Cellular Proteomics : MCP·Nicholas M RileySharon J Pitteri

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