Highly Adaptable and Sensitive Protease Assay Based on Fluorescence Resonance Energy Transfer

被引:44
|
作者
Zauner, Thomas [1 ]
Berger-Hoffmann, Renate [1 ]
Mueller, Katrin [1 ]
Hoffmann, Ralf [1 ]
Zuchner, Thole [1 ]
机构
[1] Univ Leipzig, Inst Bioanalyt Chem, Fac Chem & Mineral, Ctr Biotechnol & Biomed, D-04103 Leipzig, Germany
关键词
ENTEROPEPTIDASE LIGHT-CHAIN; WHOLE-BLOOD ASSAY; CATIONIC TRYPSINOGEN; ACTIVATION; PLASMA; AMPLIFICATION; CHYMOTRYPSIN; EXPRESSION; DISCOVERY; ENZYMES;
D O I
10.1021/ac201274f
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Proteases are widely used in analytical sciences and play a central role in several widespread diseases. Thus, there is an immense need for highly adaptable and sensitive assays for the detection and monitoring of various proteolytic enzymes. We established a simple protease fluorescence resonance energy transfer (pro-FRET) assay for the determination of protease activities, which could in principle be adapted for the detection of all proteases. As proof of principle, we demonstrated the potential of our method using trypsin and enteropeptidase in complex biological mixtures. Briefly, the assay is based on the cleavage of a FRET peptide substrate, which results in a dramatic increase of the donor fluorescence. The assay was highly sensitive and fast for both proteases. The detection limits for trypsin and enteropeptidase in Escherichia coli lysate were 100 and 10 amol, respectively. The improved sensitivity for enteropeptidase was due to the application of an enzyme cascade, which leads to signal amplification. The pro-FRET assay is highly specific as even high concentrations of other proteases did not result in significant background signals. In conclusion, this sensitive and simple assay can be performed in complex biological mixtures and can be easily adapted to act as a versatile tool for the sensitive detection of proteases.
引用
收藏
页码:7356 / 7363
页数:8
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