Title Receptor arrays for the selective and efficient capturing of viral particles.
Author Pollheimer, Philipp D; Kastner, Markus; Ebner, Andreas; Blaas, Dieter; Hinterdorfer, Peter; Gruber, Hermann J; Howorka, Stefan
Journal Bioconjug Chem Publication Year/Month 2009-Mar
PMID 19196022 PMCID -N/A-
Affiliation 1.Institute of Biophysics, Johannes Kepler University, Linz, Austria.

We describe microarrays of receptors on gold/glass substrates for the selective capturing of viral particles at high density. Microscale gold squares were surface-modified with alkanethiol derivatives which enabled the immobilization of the His(6)-tagged virus-binding domain from the very-low density lipoprotein (VLDL) receptor. The free glass areas surrounding the gold squares were passivated with a dense film of poly(ethylene glycol) (PEG). As assessed by atomic force microscopy, human rhinovirus particles were captured onto the VLDL-receptor patches with a high surface coverage but were effectively repelled by the PEG layer, resulting in a 330 000-fold higher density of the particles on the gold as compared to the glass surfaces. The metal chelate-based coupling strategy was found to be superior to two alternative routes, which used the covalent coupling of viral particles or viral receptors to the substrate surface. The high-density receptor arrays were employed for sensing and characterizing viral particles with so far unprecedented selectivity.

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