Title Biohybrid structures consisting of biotinylated glycodendrimers and proteins: influence of the biotin ligand's number and chemical nature on the biotin-avidin conjugation
Date 21.02.2014
Number 39549
Abstract We present the bioconjugation of avidin as a central and/or bridging building block with mono-, bi- and tetravalent biotinylated glycodendrimers to fabricate defined supramolecular nanostructures for future (bio)medical applications. For this purpose mono-, bi- and tetravalent biotinylated glycodendrimers, decorated with short alkyl-linked or long PEG-linked biotin ligands, were synthesized and characterized by NMR, IR and mass spectrometry and HABA displacement assay. Various techniques (UV/Vis, DLS, TEM, LILBIB-MS and AF4) were used in order to obtain information about the structural properties of different conjugates of avidin and mono-, bi- and tetravalent biotinylated glycodendrimers. The combination of the biotin ligand´s spacer length, its chemical structure and the degree of biotin functionalization are essential parameters in the formation of nanostructures with avidin having a controlled composition and size dimension up to 100 nm. Biohybrid structures with avidin as central unit require monovalent glycodendrimers with PEG-linked biotin, while bi- and tetravalent glycodendrimers with short alkyl-linked biotin ligands are more efficient than their counterparts with longer PEG-biotin ligands in the fabrication of defined biohybrid structures (· up to 100 nm) with avidin as bridging unit. The most dominating key issue, combined with other conjugation issues, is the optimal ligand-receptor stoichiometry to fabricate biohybrid structures with diameter of < 20, < 30 or up to 100 nm.
Publisher Polymer Chemistry
Citation Polymer Chemistry 5 (2014) 1323-1339
Authors Ennen, F. ; Boye, S. ; Lederer, A. ; Cernescu, M. ; Komber, H. ; Brutschy, B. ; Voit, B. ; Appelhans, D.
Tags heterogeneously functionalized dendrimers field-flow fractionation laser mass-spectrometry host-guest interactions pamam dendrimers biological molecules magnetic-resonance drug-delivery gene delivery epr

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