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	Light-switching excimer probes for rapid protein monitoring in complex biological fluids
	Yang CY(杨朝勇)
	2005
关键词	aptamer biomarker platelet-derived growth factor pyrene time-resolved fluorescence
英文摘要	Quantitative protein bioanalysis in complex biological fluids presents considerable challenges in biological studies and disease diagnosis. The major obstacles are the background signals from both the probe and the biological fluids where the proteins reside. We have molecularly engineered light-switching excimer aptamer probes for rapid and sensitive detection of a biomarker protein, platelet-derived growth factor (PDGF). Labeled with one pyrene at each end, the aptamer switches its fluorescence emission from approximate to 400 nm (pyrene monomer) to 485 nm (pyrene excimer) upon PDGF binding. This fluorescence wavelength change from monomer to excimer emission is a result of aptamer conformation rearrangement induced by target binding. The excimer probe is able to effectively detect picomolar PDGF in homogeneous solutions. Because the excimer has a much longer fluorescence lifetime (approximate to 40 ns) than that of the background (approximate to 5 ns), time-resolved measurements were used to eliminate the biological background. We thus were able to detect PDGF in a cell sample quantitatively without any sample pretreatment. This molecular engineering strategy can be used to develop other aptamer probes for protein monitoring. Combined with lifetime-based measurements and molecular engineering, light-switching excimer aptamer probes hold great potential in protein analysis for biomedical studies.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/62398]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Yang CY. Light-switching excimer probes for rapid protein monitoring in complex biological fluids[J],2005.
APA	杨朝勇.(2005).Light-switching excimer probes for rapid protein monitoring in complex biological fluids..
MLA	杨朝勇."Light-switching excimer probes for rapid protein monitoring in complex biological fluids".(2005).

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