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
Guo J
中科院分区:
化学1区
文献类型:
--
作者:
Shang X;Wang N;Cerny R;Niu W;Guo J

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我们展示了一个通用的保护-脱保护策略的荧光蛋白生物传感器的设计,通过构建一个打开的Hg 2+传感器。使用荧光蛋白工程和非天然氨基酸诱变的组合。与以前报道的基于荧光蛋白的Hg 2+传感器依赖于Hg 2+与半胱氨酸残基的巯基的结合不同,一种成熟的化学反应,氧汞化,被转化为生物形式并纳入我们的传感器设计中。这种新型的汞离子传感器显示出良好的灵敏度和选择性,在体外和活细菌细胞。在10 μM Hg ~(2+)存在下,荧光信号输出变化超过60倍,而在其他9种金属离子存在下,这种变化是无法检测到的。这种新的设计策略可以扩展基于荧光蛋白的生物传感器用于检测小分子分析物的库。
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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