期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 35, 页码 13744-13748出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b06450
关键词
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资金
- Air Force Research Laboratory [FA8650-15-2-5518]
- Vannevar Bush Faculty Fellowship program - Basic Research Office of the Assistant Secretary of Defense for Research and Engineering
- Office of Naval Research [N00014-15-1-0043]
- American Cancer Society [RSG-14-098-01-CCE]
- National Cancer Institute of the National Institutes of Health [U54CA199091]
- NCI [CCSG P30 CA060553]
- Sherman Fairchild Foundation, Inc.
Aptamers are oligonucleotide sequences that can be evolved to bind to various analytes of interest. Here, we present a general design strategy that transduces an aptamer-target binding event into a fluorescence readout via the use of a viscosity-sensitive dye. Target binding to the aptamer leads to forced intercalation (FIT) of the dye between oligonucleotide base pairs, increasing its fluorescence by up to 20-fold. Specifically, we demonstrate that FIT-aptamers can report target presence through intramolecular conformational changes, sandwich assays, and target-templated reassociation of splitaptamers, showing that the most common aptamer-target binding modes can be coupled to a FIT-based readout. This strategy also can be used to detect the formation of a metallo-base pair within a duplexed strand and is therefore attractive for screening for metal-mediated base pairing events. Importantly, FIT-aptamers reduce false-positive signals typically associated with fluorophore-quencher based systems, quantitatively outperform FRET-based probes by providing up to 15-fold higher signal to background ratios, and allow rapid and highly sensitive target detection (nanomolar range) in complex media such as human serum. Taken together, FIT-aptamers are a new class of signaling aptamers which contain a single modification, yet can be used to detect a broad range of targets.
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