Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 37, Pages 15225-15228Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja3061276
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Funding
- Fujitsu Laboratories Ltd.
- TUM Institute of Advanced Study
- Nanosystems Initiative Munich
- TUM International Graduate School of Science and Engineering
- BMBF via GO-Bio
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A label-free method for the analysis of interactions of proteins with surface-tethered ligands is introduced. Short DNA levers are electrically actuated on microelectrodes by ac potentials, and their switching dynamics are measured in real-time by fluorescence energy transfer. Binding of proteins to ligands attached to the top of the DNA levers is detected by time-resolved measurements of the levers' dynamic motion. We demonstrate the quantitation of binding kinetics (k(on), k(off) rate constants), dissociation constants (K-D in the pM regime), and the influence of competitive binders (EC50 values). Moreover, the switchSENSE method reveals avidity effects and allows discriminating between analytes with one or more binding sites. In a comparative study, interactions of six hexa-histidine-tagged proteins with tris-nitrilotriacetic acid (NTA(3)) ligands are quantitated. Their binding kinetics and affinities are found to vary over up to 2 orders of magnitude, evidencing that the proteins' individual chemical environments significantly influence the His(6)-NTA(3) interaction.
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