Lipid Bilayer-like Mixed Self-Assembled Monolayers with Strong Mobility and Clustering-Dependent Lectin Affinity

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Lipid Bilayer-like Mixed Self-Assembled Monolayers with Strong Mobility and Clustering-Dependent Lectin Affinity

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Publication Article, peer reviewed scientific
Title Lipid Bilayer-like Mixed Self-Assembled Monolayers with Strong Mobility and Clustering-Dependent Lectin Affinity
Author Yeung, Sing Yee ; Sergeeva, Yulia ; Dam, Tommy ; Jönsson, Peter ; Pan, Guoqing ; Chaturvedi, Vivek ; Sellergren, Börje
Research Centre Biofilms - Research Center for Biointerfaces
Date 2019
English abstract
Glycans at the surface of cellular membranes modulate biological activity via multivalent association with extracellular messengers. The lack of tuneable simplified models mimicking this dynamic environment complicates basic studies of these phenomena. We here present a series of mixed reversible self-assembled monolayers (rSAMs) that addresses this deficiency. Mixed rSAMs were prepared in water by simple immersion of a negatively charged surface in a mixture of sialic acid- and hydroxy-terminated benzamidine amphiphiles. Surface compositions derived from infrared reflection-absorption spectroscopy (IRAS) and film thickness information (atomic force microscopy, ellipsometry) suggest the latter to be statistically incorporated in the monolayer. These surfaces' affinity for the lectin hemagglutinin revealed a strong dependence of the affinity on the presentation, density, and mobility of the sialic acid ligands. Hence, a spacer length of 4 ethylene glycol and a surface density of 15% resulted in a dissociation constant K-d,K-multi of 1.3 x 10(-13) M, on par with the best di- or tri-saccharide-based binders reported to date, whereas a density of 20% demonstrated complete resistance to hemagglutinin binding. These results correlated with ligand mobility measured by fluorescence recovery after photobleaching which showed a dramatic drop in the same interval. The results have a direct bearing on biological cell surface multivalent recognition involving lipid bilayers and may guide the design of model surfaces and sensors for both fundamental and applied studies.
DOI https://doi.org/10.1021/acs.langmuir.9b01452 (link to publisher's fulltext.)
Publisher American Chemical Society
Host/Issue Langmuir;24
Volume 35
ISSN 0743-7463
Language eng (iso)
Subject Chemistry, Multidisciplinary
Chemistry, Physical
Materials Science, Multidisciplinary
Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/30218 Permalink to this page
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