Transcription Factor Based Small-Molecule Sensing with a Rapid Cell Phone Enabled Fluorescent Bead Assay.
Transcription Factor Based Small-Molecule Sensing with a Rapid Cell Phone Enabled Fluorescent Bead Assay.
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DOI:
10.1002/anie.202007575
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发表时间:
2020-11-23
期刊:
影响因子:
--
通讯作者:
Dennis AM
中科院分区:
文献类型:
--
作者:
Chern M;Garden PM;Baer RC;Galagan JE;Dennis AM
Recently, allosteric transcription factors (TF) have been identified as a novel class of biorecognition elements for in vitro sensing, whereby an indicator of the differential binding affinity between a TF and its cognate DNA exhibits dose-dependent responsivity to an analyte. Here, we describe a modular bead-based biosensor design that can be applied to such TF-DNA-analyte systems. DNA-functionalized beads enable efficient mixing and spatial separation, while TF-labeled semiconductor quantum dots serve as bright fluorescent indicators of the TF-DNA bound (on bead) and unbound states. The prototype sensor for derivatives of the antibiotic tetracycline exhibits nanomolar sensitivity with visual detection of bead fluorescence. Facile changes in the sensor construction enable sensor response tuning without necessitating changes to the biomolecular affinities. Assay components self-assemble, and readout by eye or digital camera is possible within 5 minutes of analyte addition, making use of the sensor facile, rapid, and instrument-free. Allosteric transcription factor TetR acts as sensor and actuator in this quantum dot-enabled fluorescent bead assay for the small molecule anhydrotetracycline. This rapid, antibody-free biosensor produces a visible change in fluorescent color that can be detected by eye or using an inexpensive digital camera based on dose-dependent analyte-responsive protein-DNA binding. The adaptable sensor uses easily accessible biomolecular components.
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