Lipid Bilayer-like Mixed Self-Assembled Monolayers with Strong Mobility and Clustering-Dependent Lectin Affinity
(2019) In Langmuir 35(24). p.8174-8181- 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- A nd 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... (More)
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- A nd 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 Kd,multi of 1.3 × 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.
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- author
- Yeung, Sing Yee ; Sergeeva, Yulia LU ; Dam, Tommy LU ; Jönsson, Peter LU ; Pan, Guoqing ; Chaturvedi, Vivek and Sellergren, Börje
- organization
- publishing date
- 2019-06-18
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Langmuir
- volume
- 35
- issue
- 24
- pages
- 8 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85067030050
- pmid:31117738
- ISSN
- 0743-7463
- DOI
- 10.1021/acs.langmuir.9b01452
- language
- English
- LU publication?
- yes
- id
- f202cb8b-2423-4609-8e28-7f6faa355519
- date added to LUP
- 2019-07-01 12:37:07
- date last changed
- 2024-06-27 01:05:38
@article{f202cb8b-2423-4609-8e28-7f6faa355519,
abstract = {{<p>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- A nd 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<sub>d,multi</sub> of 1.3 × 10<sup>-13</sup> 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.</p>}},
author = {{Yeung, Sing Yee and Sergeeva, Yulia and Dam, Tommy and Jönsson, Peter and Pan, Guoqing and Chaturvedi, Vivek and Sellergren, Börje}},
issn = {{0743-7463}},
language = {{eng}},
month = {{06}},
number = {{24}},
pages = {{8174--8181}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Langmuir}},
title = {{Lipid Bilayer-like Mixed Self-Assembled Monolayers with Strong Mobility and Clustering-Dependent Lectin Affinity}},
url = {{http://dx.doi.org/10.1021/acs.langmuir.9b01452}},
doi = {{10.1021/acs.langmuir.9b01452}},
volume = {{35}},
year = {{2019}},
}