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- W2115598821 abstract "Ideal diagnostic nanoprobes should not exceed 15 nm in size and should contain high-affinity homogeneously oriented capture molecules on their surface. An advanced procedure for antibody (Ab) reduction was used to cleave each Ab into two functional half-Abs, 75-kDa heavy-light chain fragments, each containing an intact antigen-binding site. Affinity purification of half-Abs followed by their linkage to quantum dots (QDs) yielded oriented QD-Ab conjugates whose functionality was considerably improved compared to those obtained using the standard protocols. Ultrasmall diagnostic nanoprobes were engineered through oriented conjugation of QDs with 13-kDa single-domain Abs (sdAbs) derived from llama IgG. sdAbs were tagged with QDs via an additional cysteine residue specifically integrated into the C-terminal region of sdAb using genetic engineering. This approach made it possible to obtain sdAb-QD nanoprobes <12 nm in diameter comprising four copies of sdAbs linked to the same QD in an oriented manner. sdAb-QD conjugates against carcinoembryonic antigen (CEA) and HER2 exhibited an extremely high specificity in flow cytometry; the quality of immunohistochemical labeling of biopsy samples was found to be superior to that of labeling according to the current gold standard protocols of anatomo-pathological practice. The nano-bioengineering approaches developed can be extended to oriented conjugation of Abs and sdAbs with different semiconductor, noble metal, or magnetic nanoparticles." @default.
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- W2115598821 date "2012-02-09" @default.
- W2115598821 modified "2023-09-23" @default.
- W2115598821 title "Oriented conjugates of monoclonal and single-domain antibodies with quantum dots for flow cytometry and immunohistochemistry diagnostic applications" @default.
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- W2115598821 doi "https://doi.org/10.1117/12.905896" @default.
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