化学
核酸外切酶 III
荧光
多路复用
DNA
核酸外切酶
检出限
转录因子
脚印
分子生物学
赫拉
分子探针
生物物理学
生物化学
色谱法
体外
聚合酶
基因
遗传学
生物
大肠杆菌
物理
量子力学
作者
Yue Sun,Liu Zang,Choiwan Lau,Xueji Zhang,Jianzhong Lu
出处
期刊:Talanta
[Elsevier]
日期:2021-07-01
卷期号:229: 122272-122272
被引量:5
标识
DOI:10.1016/j.talanta.2021.122272
摘要
Aberrant transcription factors (TFs) activities are closely related to the occurrence and development of various diseases. Herein, we presented a fluorescence-encoded microsphere-based approach for TFs detection coupling with common DNA footprinting assay. Target TFs specifically bound the binding sites of double-stranded DNA (dsDNA) probes which were conjugated to microspheres. Thus, the probes were protected from being hydrolyzed by exonuclease III (Exo III). Afterwards, biotins labeled on the probes reacted with streptavidin-phycoerythrin (SA-PE) to produce fluorescent signal; however, in the absence of target TFs, the dsDNA probes would be hydrolyzed by Exo III resulting in biotins falling off and thus fluorescence signal was not generated. This strategy can be used to detect nuclear factor-kappa B p50 (NF-κB p50) with a detection limit of 0.2 nM. The steric hindrance of microspheres overcome the disadvantage of Exo III that can nibble into the protein-bound DNA region. Meanwhile, the fluorescent label of microsphere was specific to each TF, enabling multiplex detection could be achieved by changing specific protein binding site of corresponding dsDNA probe. This method has been successfully applied for simultaneous detection of NF-κB p50, AP-1 and CREB in nuclear extract isolated from HeLa cells stimulated or unstimulated by TNF-α, showing great potential for biomedical researches and precise disease diagnosis.
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