富含胞嘧啶单链DNA-银纳米簇荧光探针用于S1核酸酶的灵敏检测

doi:10.7503/cjcu20170113

高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (8): 1334.doi: 10.7503/cjcu20170113

富含胞嘧啶单链DNA-银纳米簇荧光探针用于S1核酸酶的灵敏检测

王星星, 李盼盼, 何婧琳, 欧阳文, 肖慧, 杨婵, 曹忠

长沙理工大学化学与生物工程学院, 电力与交通材料保护湖南省重点实验室, 微纳生物传感与食品安全检测协同创新中心, 长沙 410114

收稿日期:2017-02-25 修回日期:2017-07-05 出版日期:2017-08-10 发布日期:2017-07-05
通讯作者: 曹忠,男,博士,教授,博士生导师,主要从事纳米生物传感与食品安全检测方面的研究.E-mail:zhongcao2004@163.com E-mail:zhongcao2004@163.com
基金资助:
国家自然科学基金（批准号：31527803，21545010，21645009）和中国科学院科技服务网络（STS）计划项目（批准号：KFJ-SW-STS-173）资助.

Cytosine-rich Oligonucleotide-templated Fluorescent Silver Nanoclusters for Sensitive Assay of S1 Nuclease

WANG Xingxing, LI Panpan, HE Jinglin, OUYANG Wen, XIAO Hui, YANG Chan, CAO Zhong

Collaborative Innovation Center of Micro/nano Bio-sensing and Food Safety Inspection, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410114, China

Received:2017-02-25 Revised:2017-07-05 Online:2017-08-10 Published:2017-07-05
Supported by:
Supported by the National Natural Science Foundation of China(Nos. 31527803, 21545010, 21645009) and the Science and Technology Service Network(STS) Program of the Chinese Academy of Sciences, China(No. KFJ-SW-STS-173).

摘要/Abstract

摘要：

以富含胞嘧啶（C）的单链DNA为模板合成银纳米簇，将其作为功能化探针，建立了一种无标记荧光检测S1核酸酶的方法.S1核酸酶可以特异性识别单链DNA，在最适的酶催化反应条件下，可将其降解为单核苷酸或寡核苷酸片段.当S1核酸酶不存在时，富含C的单链DNA可以有效地合成荧光银纳米簇；当S1核酸酶存在时，单链DNA模板被特异性识别并降解，导致无法形成银纳米簇，使体系荧光信号降低.实验结果表明，银纳米簇的荧光强度随着S1核酸酶浓度的增加而降低.在优化的条件下，体系荧光信号（F/F₀）与S1核酸酶的浓度在5.0×10^-5~4.0×10^-3 U/μL范围内呈线性关系，检出限为2.0×10^-6 U/μL.该荧光探针选择性好，可用于RPMI 1640细胞培养基中S1核酸酶的检测，回收率达到91.8%~109.5%.

关键词: 银纳米簇, 富含胞嘧啶单链DNA, S1核酸酶, 荧光探针

Abstract:

A label-free fluorescence method for detection of S1 nuclease was developed using oligonucleotide-templated silver nanoclusters(AgNCs). Cytosine-rich single strand DNA(C-rich ssDNA) scaffolded silver nanoclusters were devised and synthesized as a functional probe. S1 nuclease can specifically recognize ssDNA, which is degraded into mononucleotide and oligonucleotide fragment under the optimum enzyme-catalyzed reaction condition. In the absence of S1 nuclease, the silver nanoclusters could be effectively synthesized by C-rich ssDNA, which produced obvious fluorescence intensity. In the presence of S1 nuclease, C-rich ssDNA probes were specifically recognized and effectively digested into small fragments. As a result, the silver nanoclusters synthesis was suspended leading a fluorescence reduction. A good linear correlation was obtained between fluorescence change and the logarithm of the Cu²⁺ ions concentration over the range from 5.0×10^-5 U/μL to 4.0×10^-3 U/μL. The detection limit was estimated as 2.0×10^-6 U/μL. The proposed method was highly selective and there were no obvious interfering effects on the determination from Bst polymerase, Thrombin, ExoⅢ, E.coli ligase and BSA. The proposed sensor reveals good recovery rates from 91.8% to 109.5% in RPMI 1640 cell medium, indicating that the sensing system was feasible for the detection of S1 nuclease in practical samples. This label-free, simple and cost-effective strategy has a potential application in biomedical research and clinical early diagnosis.

Key words: Silver nanoclusters, Cytosine-rich ssDNA, S1 nuclease, Fluorescent probe

中图分类号:

O657.3

TrendMD:

王星星, 李盼盼, 何婧琳, 欧阳文, 肖慧, 杨婵, 曹忠. 富含胞嘧啶单链DNA-银纳米簇荧光探针用于S1核酸酶的灵敏检测. 高等学校化学学报, 2017, 38(8): 1334.

WANG Xingxing, LI Panpan, HE Jinglin, OUYANG Wen, XIAO Hui, YANG Chan, CAO Zhong. Cytosine-rich Oligonucleotide-templated Fluorescent Silver Nanoclusters for Sensitive Assay of S1 Nuclease. Chem. J. Chinese Universities, 2017, 38(8): 1334.

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富含胞嘧啶单链DNA-银纳米簇荧光探针用于S1核酸酶的灵敏检测

Cytosine-rich Oligonucleotide-templated Fluorescent Silver Nanoclusters for Sensitive Assay of S1 Nuclease

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