Fluorescent Protein-Based Turn-On Probe through a General Protection-Deprotection Design Strategy.
Fluorescent Protein-Based Turn-On Probe through a General Protection-Deprotection Design Strategy.
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DOI:
10.1021/acssensors.7b00223
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发表时间:
2017-07-28
期刊:
影响因子:
8.9
通讯作者:
Guo J
中科院分区:
文献类型:
--
作者:
Shang X;Wang N;Cerny R;Niu W;Guo J
We demonstrated a general protection-deprotection strategy for the design of fluorescent protein biosensors through the construction of a turn-on Hg2+ sensor. A combination of fluorescent protein engineering and unnatural amino acid mutagenesis was used. Unlike previously reported fluorescent protein-based Hg2+ sensors that relied on the binding of Hg2+ to the sulfhydryl group of cysteine residues, a well-established chemical reaction, oxymercuration, was transformed into biological format and incorporated into our sensor design. This novel Hg2+ sensor displayed good sensitivity and selectivity both in vitro and in live bacterial cells. Over 60 folds change in fluorescence signal output was observed in the presence of 10 μM Hg2+, while such change was undetectable when nine other metal ions were tested. This new design strategy could expand the repertoire of fluorescent protein-based biosensors for the detection of small-molecule analytes.
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