A new light-scattering sensor for screening G-quadruplex stabilizers based on DNA-folding-mediated assembly of gold nanoparticles
作者:Da-Qian Feng、Guoliang Liu、Wenjie Zheng、Tianfeng Chen、Dan Li
DOI:10.1039/c3tb20291g
日期:——
In this contribution, we constructed a biosensor for screening G-quadruplex stabilizers based on the assembly of gold nanoparticles functionalized with guanine-rich (G-rich) ssDNA using a light-scattering technique. We synthesized a series of metal–terpyridine complexes and investigated their affinity for quadruplex-DNA using the biosensor. Using the ratio of intensity of the light-scattering peak (I − I0)/I0, it can intuitively present the sequence of ability of stabilizing G-quadruplex DNA as follows: complex 1 > complex 3 > MTX > complex 2 > complex 5 > complex 6 > complex 7 > complex 4 > methyl green > TO > complex 8 > cisplatin. As our method allows the quantitative analysis of stabilizer affinity, EC50 values obtained are 4.8, 5.3, 6.1, 6.6, 6.7, 18.2, 20.2, 21.5, 32.2, 41.5 and 48.1 μM for complex 1, complex 3, MTX, complex 2, complex 5, complex 6, complex 7, complex 4, methyl green, TO and complex 8, respectively. The results have been verified by G-quadruplex fluorescent intercalator displacement (G4-FID) analysis. The proposed approach is a simple, convenient, intuitive and highly sensitive assay for screening G-quadruplex stabilizers. Our developed biosensor provides a promising tool for screening anticancer drugs.
在这篇论文中,我们利用光散射技术组装了富含鸟嘌呤(G-rich)ssDNA 的金纳米粒子,并在此基础上构建了一种用于筛选 G-四重链稳定剂的生物传感器。我们合成了一系列金属-三吡啶配合物,并利用该生物传感器研究了它们对四重 DNA 的亲和力。利用光散射峰强度(I - I0)/I0 的比值,可以直观地呈现出稳定 G 型四链 DNA 的能力顺序:复合物 1 > 复合物 3 > MTX > 复合物 2 > 复合物 5 > 复合物 6 > 复合物 7 > 复合物 4 > 甲基绿 > TO > 复合物 8 > 顺铂。由于我们的方法可以定量分析稳定剂的亲和力,因此得到的复合物 1、复合物 3、MTX、复合物 2、复合物 5、复合物 6、复合物 7、复合物 4、甲基绿、TO 和复合物 8 的 EC50 值分别为 4.8、5.3、6.1、6.6、6.7、18.2、20.2、21.5、32.2、41.5 和 48.1 μM。这些结果已通过 G-四联体荧光插层置换(G4-FID)分析得到验证。所提出的方法是一种简单、方便、直观和高灵敏度的筛选 G-四叉稳定剂的检测方法。我们开发的生物传感器为筛选抗癌药物提供了一种前景广阔的工具。