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- W2047818077 abstract "Heme proteins in general are shown to be an effective linking agent in stabilizing gold nanoparticles (AuNPs) and thus facilitate the fabrication of three-dimensional (3D) AuNP multilayers on a chip, resulting in a higher coating density than that on polymer linker anchored surfaces for analytical applications. With the use of electron spectroscopy for chemical analysis (ESCA) measurements, a lower oxidation state of Au(0) and dramatic changes among multiple chemical states of N1s are detected upon coating AuNPs with heme proteins but not detected upon coating AuNPs with non-heme proteins. Thus, we propose that the stabilization power arises from π-conjugation between AuNPs and the heme group. We also propose that such conjugation must be facilitated by the exposure of the heme group through a conformational change of the protein as well as interactions of other functional groups with AuNPs to bring the heme moiety to a close face-to-face distance with the AuNPs. A high-density double-stranded DNA (dsDNA) composed of a sequence of estrogen response element (ERE) is then fabricated on heme protein anchored chips. An in situ hybridization and tracking method is developed based on hybridization-induced fluorescence restoration associated with AuNPs and assists in the subsequent detection of DNA/protein binding on the same chip. The AuNP ERE chips are shown to have high sensitivity and specificity for quantitative detection of ERE binding with its two transcription factor isoforms, estrogen receptors α and β (ERα and ERβ), in cell lysates with reduced reagents and reaction time." @default.
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- W2047818077 date "2009-04-09" @default.
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- W2047818077 title "Heme Protein Assisted Dispersion of Gold Nanoparticle Multilayers on Chips: From Stabilization to High-Density Double-Stranded DNAs Fabricated in Situ for Protein/DNA Binding" @default.
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- W2047818077 doi "https://doi.org/10.1021/ac900295j" @default.
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