Journal
BIOSENSORS & BIOELECTRONICS
Volume 55, Issue -, Pages 391-395Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2013.12.050
Keywords
Fluorescent assay; Estrogen receptor; Homogeneous fluorescent assay; 17 beta-Estradiol; Coumestrol Neuron culture medium
Categories
Funding
- NSF of China [91132717, 21175007]
- National 863 Program [2007AA06Z401]
- Research Fund for the Doctoral Program of Higher Education of China [20110001110083]
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In this work, we demonstrate a novel estrogenic receptor fragment-based homogeneous fluorescent assay which enables rapid and sensitive detection of 17 beta-estradiol (E2) and other highly potent estrogens. A modified human estrogenic receptor fragment (N-His x 6-hER(270-595)-C-Strep tag II) has been constructed that contains amino acids 270-595 of wild-type human estrogenic receptor alpha (hER(270-595)) and two specific tags (6 x His and Strep tag II) fused to the N and C terminus, respectively. The designed receptor protein fragment could be easily produced by prokaryotic expression with high yield and high purity. The obtained protein exhibits high binding affinity to E2 and the two tags greatly facilitate the application of the recombinant protein. Taking advantage of the unique spectroscopic properties of coumestrol (CS), a fluorescent phytoestrogen, a CS/hER(270-595)-based fluorescent assay has been developed which can sensitively respond to E2 within 1.0 min with a linear working range from 0.1 to 20 ng/mL and a limit of detection of 0.1 ng/mL. The assay was successfully applied for rapid detection of E2 in the culture medium of rat hippocampal neurons. The method also holds great potential for high-throughput monitoring the variation of estrogen levels in complex biological fluids, which is crucial for investigation of the molecular basis of various estrogen-involved processes. (C) 2013 Elsevier B.V. All rights reserved.
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