清脆的
适体
劈理(地质)
化学
DNA
反式激活crRNA
生物传感器
电化学发光
三磷酸腺苷
生物物理学
基因组编辑
生物化学
生物
分子生物学
检出限
基因
古生物学
色谱法
断裂(地质)
作者
Qinqin Zhao,Xiang Ren,Shoufeng Wang,Dawei Fan,Nuo Zhang,Lei Liu,Yuyang Li,Qin Wei
标识
DOI:10.1016/j.snb.2022.132553
摘要
Encouraged by the remarkable editability, sequence-specificity, trans-cleavage peculiarity of the CRISPR-Cas12a, the concept of CRISPR-Cas12a accessory cleavage activity triggering electrochemiluminescence (ECL) biosensor for adenosine triphosphate (ATP) detection was proposed. The ATP aptamer was elaborately designed to stimulate the CRISPR-Cas12a activity for non-specifical trans-cleavage of the single-stranded DNA (ssDNA) modified L[email protected]3O4 MNPs. Those sheared ssDNA fragments and the hatched capture DNA on the electrode surface folded into double-helix structures for embedding of tris (2, 2´-bipyridine) dichlororuthenium (Ⅱ) [Ru(bpy)23+] molecules to trigger "turn-on" signal. Specific conjugation of ATP aptamer to ATP surpassed base complementary pairing with the CRISPR-Cas12a, which inhibited CRISPR-Cas12a accessory cleavage activity and interfered with stability of the Cas12a-crRNA-ATP aptamer complex causing the "on-off" signal transformation. Thanks to the efficient signal-amplification produced by the editable CRISPR-Cas12a, this biosensor was performed for the specific and precise detection of ATP with the detection limit of 1.9 nM. Acceptable results showcase this CRISPR-Cas12a assisted ECL sensing strategy will open up a new pathway for more related bioanalysis.
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