Luminescence sensitization of Tb3+-DNA complexes by Ag+

被引：8

作者：

Xu, Lijun ^{[1
,2
]}

Zhou, Lu ^{[1
]}

Chen, Xing ^{[3
]}

Shen, Xiaoqiang ^{[1
,4
]}

Wang, Jine ^{[1
]}

Zhang, Jianye ^{[4
]}

Pei, Renjun ^{[1
]}

机构：

[1] Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, CAS Key Lab Nanobio Interface, Div Nanobiomed, Suzhou 215123, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Guangxi Med Univ, Publ Hlth, Nanning 530021, Peoples R China

[4] Zhengzhou Univ, Sch Chem & Mol Engn, Zhengzhou 450001, Peoples R China

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2017年 / 180卷

基金：

中国国家自然科学基金;

关键词：

Luminescence; Terbium; DNA; Silver; TERBIUM ION; COORDINATION POLYMERS; SELECTIVE DETECTION; ENERGY-TRANSFER; NUCLEIC-ACID; DNA; BINDING; PROBE; FLUORESCENCE; NANOPARTICLES;

D O I：

10.1016/j.saa.2017.03.001

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Terbium ions (Tb3+) with unique photophysical properties have been utilized to develop biosensors with low background and high sensitivity. In this study, the Ag+-sensitized luminescence of Tb3+-DNA complexes was uncovered. The luminescence of Tb3+-DNA complexes could be enhanced by more than 30 times in the presence of Ag+, when Tb3+ was bound with poly(G) and poly(T) whereas not with other homopolymers. This research confirmed that the sensitization resulted from the interaction of Ag+ with certain bases involved in DNA, not just with the reported certain G-quadruplex sequence. The coordination of Ag+ to guanine and thymine bases was expected to increase their rigidities, form Tb3+-DNA-Ag+ ternary structures, and thus enhance energy transfer from guanine and thymine to Tb3+. These findings benefit the development of sensitive luminescence probes for various nucleic acids-related targets. (C) 2017 Elsevier B.V. All rights reserved.

引用

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页码：85 / 90

页数：6

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