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Elucidation of the binding orientation in α2,3- and α2,6-linked neu5ac-gal epitopes toward a hydrophilic molecularly imprinted monolith
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.ORCID-id: 0000-0001-8883-607x
Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, Malmö, Sweden.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
Department of Biomedical Sciences, Faculty of Health and Society, Malmö University, Malmö, Sweden.
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2023 (Engelska)Ingår i: ACS Omega, E-ISSN 2470-1343, Vol. 8, nr 46, s. 44238-44249Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

N-Acetylneuraminic acid and its α2,3/α2,6-glycosidic linkages with galactose (Neu5Ac-Gal) are major carbohydrate antigen epitopes expressed in various pathological processes, such as cancer, influenza, and SARS-CoV-2. We here report a strategy for the synthesis and binding investigation of molecularly imprinted polymers (MIPs) toward α2,3 and α2,6 conformations of Neu5Ac-Gal antigens. Hydrophilic imprinted monoliths were synthesized from melamine monomer in the presence of four different templates, namely, N-acetylneuraminic acid (Neu5Ac), N-acetylneuraminic acid methyl ester (Neu5Ac-M), 3′-sialyllactose (3SL), and 6′-sialyllactose (6SL), in a tertiary solvent mixture at temperatures varying from −20 to +80 °C. The MIPs prepared at cryotemperatures showed a preferential affinity for the α2,6 linkage sequence of 6SL, with an imprinting factor of 2.21, whereas the α2,3 linkage sequence of 3SL resulted in nonspecific binding to the polymer scaffold. The preferable affinity for the α2,6 conformation of Neu5Ac-Gal was evident also when challenged by a mixture of other mono- and disaccharides in an aqueous test mixture. The use of saturation transfer difference nuclear magnetic resonance (STD-NMR) on suspensions of crushed monoliths allowed for directional interactions between the α2,3/α2,6 linkage sequences on their corresponding MIPs to be revealed. The Neu5Ac epitope, containing acetyl and polyalcohol moieties, was the major contributor to the sequence recognition for Neu5Ac(α2,6)Gal(β1,4)Glc, whereas contributions from the Gal and Glc segments were substantially lower.

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American Chemical Society (ACS), 2023. Vol. 8, nr 46, s. 44238-44249
Nationell ämneskategori
Organisk kemi
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URN: urn:nbn:se:umu:diva-217983DOI: 10.1021/acsomega.3c06836PubMedID: 38027366Scopus ID: 2-s2.0-85178321169OAI: oai:DiVA.org:umu-217983DiVA, id: diva2:1819685
Forskningsfinansiär
EU, Horisont 2020, H2020EU, Horisont 2020, 722171Tillgänglig från: 2023-12-14 Skapad: 2023-12-14 Senast uppdaterad: 2024-07-02Bibliografiskt granskad

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Huynh, Chau MinhSparrman, TobiasIrgum, Knut

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