Receptor arrays for the selective and efficient capturing of viral particles

Bioconjug Chem. 2009 Mar 18;20(3):466-75. doi: 10.1021/bc800357j.

Abstract

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Glass / chemistry*
  • Gold / chemistry*
  • Lipoproteins, VLDL / chemistry
  • Microscopy, Atomic Force
  • Polyethylene Glycols / chemistry
  • Receptors, LDL / chemistry
  • Receptors, LDL / metabolism*
  • Rhinovirus / isolation & purification*
  • Rhinovirus / metabolism
  • Surface Properties
  • Virion / isolation & purification*
  • Virion / metabolism

Substances

  • Lipoproteins, VLDL
  • Receptors, LDL
  • VLDL receptor
  • Polyethylene Glycols
  • Gold