化学
生物传感器
线粒体DNA
费斯特共振能量转移
G-四倍体
自噬
DNA
色谱法
分子生物学
生物化学
荧光
基因
细胞凋亡
物理
量子力学
生物
作者
Dawei Yang,Ranran Sun,Hongxia Sun,Qian Li,Shouxin Zhang,Xiufeng Zhang,Lei Shi,Yao Li,Yalin Tang
出处
期刊:Talanta
[Elsevier]
日期:2024-09-14
卷期号:281: 126885-126885
标识
DOI:10.1016/j.talanta.2024.126885
摘要
Mitochondria are crucial powerhouses and central organelles for maintaining normal physiological activities in eukaryotic cells. The use of highly specific optical biosensors to monitor mitochondrial autophagy (mitophagy) is an important way for detecting mitochondrial abnormalities. Herein, we report a pH responsive G-quadruplex (G4) structure folded by the oligonucleotide named P24. P24 is composed of four GGCCTG repeating units, and the high guanine content allows it to form an antiparallel G4 topology at pH 4.5 (lysosomal pH). However, when pH increases to around 7.4 (mitochondrial pH), P24 further transforms into a double-stranded structure. Unlike most oligonucleotides that enter lysosomes, P24 highly targets mitochondria in live cells. These characteristics enable P24 to construct a pH responsive optical biosensor by linking a pair of fluorescence resonance energy transfer (FRET) fluorophores. The P24 based biosensor demonstrates reliable applications in detecting mitophagy in live cells.
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