Antibody arrays prepared by cutinase-mediated immobilization on self-assembled monolayers

Youngeun Kwon, Zhaozhong Han, Ece Karatan, Milan Mrksich, Brian K. Kay*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

Antibody arrays hold considerable potential in a variety of applications including proteomics research, drug discovery, and diagnostics. Many of the schemes used to fabricate the arrays fail to immobilize the antibodies at a uniform density or in a single orientation; consequently, the immobilized antibodies recognize their antigens with variable efficiency. This paper describes a strategy to immobilize antibodies in a single orientation, with a controlled density, using the covalent interaction between cutinase and its suicide substrate. Protein fusions between cutinase and five antibodies of three different types (scFv, VHH, and FN3) were prepared and immobilized upon self-assembled monolayers (SAMs) presenting a phosphonate capture ligand. The immobilized antibodies exhibit high affinity and selectivity for their taget antigens, as monitored by surface plasmon resonance and fluorescence scanning. Furthermore, by changing the density of capture ligand on the SAM the density of the immobilized antibody could be controlled. The monolayers, which also present a tri(ethylene glycol) group, are inert to non-specific adsorption of proteins and alow the detection of a specific antigen in a complex mixture. The demonstration of cutinase-directed antibody immobilization with insert SAMs provides a straightforward and robust method for preparing antibody chips.

Original languageEnglish (US)
Pages (from-to)5713-5720
Number of pages8
JournalAnalytical Chemistry
Volume76
Issue number19
DOIs
StatePublished - Oct 1 2004

ASJC Scopus subject areas

  • Analytical Chemistry

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