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We describe a general approach to label cell surface proteins using quantum dots (QD) for single-molecule tracking. QDs coated with small-hapten modified peptides are targeted to cell surface fusion proteins containing the corresponding single-chain fragment antibody (scFv). The approach is illustrated with the small hapten fluorescein (FL) and a high-affinity anti-FL scFv fused to two different proteins in yeast and murine neuronal cell line N2a.

High Affinity scFv−Hapten Pair as a Tool for Quantum Dot Labeling and Tracking of Single Proteins in Live Cells