Nowadays, gold compounds occupy a relevant position constituting a promising class of experimental anticancer metallodrugs. Several research efforts have been devoted to the investigations of the pharmacological properties of gold(I) complexes bearing phosphine ligands, such as the antiarthritic drug auranofin, that has also been shown to produce anticancer effects in vitro. In spite of the numerous studies that appeared in the literature the biological mechanisms of action of auranofin and analogues are still controversial. Here, we report on the inhibition effects of glutathione S-transferase P1-1 (GST P1-1) exerted by auranofin. The compound was able to inhibit GST P1-1 with a calculated IC(50) of 32.9±0.5μM. Interestingly, the inhibition of GST P1-1 and its cysteine mutants by the gold(I) compound is essentially the same, suggesting that probably the cysteine residues are not so essential for enzyme inactivation in contrast to other reported inhibitors. High-resolution electrospray ionisation Fourier transform ion cyclotron mass spectrometry (ESI FT-ICR MS) studies allowed characterising the binding of the compound with GST enzymes at a molecular level, confirming that similar gold binding sites may be present in the wild-type protein and its Cys mutants.

译文

如今,金化合物占据了重要地位,构成了一类有前途的实验性抗癌金属药物。已经进行了一些研究工作,致力于研究带有膦配体的金 (I) 配合物的药理特性,例如抗关节炎药物金诺芬,该药物在体外也具有抗癌作用。尽管文献中出现了许多研究,但金诺芬和类似物的生物学作用机制仍然存在争议。在这里,我们报告了金诺芬对谷胱甘肽S-转移酶P1-1 (GST P1-1) 的抑制作用。该化合物能够抑制GST P1-1,计算出的IC(50) 为32.9 ± 0.5微米。有趣的是,金 (I) 化合物对GST P1-1及其半胱氨酸突变体的抑制基本相同,这表明与其他报道的抑制剂相比,半胱氨酸残基可能对酶失活不是那么重要。高分辨率电喷雾电离傅里叶变换离子回旋加速器质谱 (ESI ft-icr MS) 研究可以在分子水平上表征该化合物与GST酶的结合,从而证实野生型蛋白及其Cys突变体中可能存在相似的金结合位点。

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