(S)-Stereoisomer of telomestatin as a potent G-quadruplex binder and telomerase inhibitor
作者:Takayuki Doi、Kazuaki Shibata、Masahito Yoshida、Motoki Takagi、Masayuki Tera、Kazuo Nagasawa、Kazuo Shin-ya、Takashi Takahashi
DOI:10.1039/c0ob00513d
日期:——
Total synthesis of the (S)-stereoisomer of telomestatin (1) was accomplished. (S)-Telomestatin exhibited potency four times that of the natural product, (R)-telomestatin, which was the most potent telomerase inhibitor previously reported. In the circular dichroism spectral analysis of the complexes possessing randomly structured single-stranded d[TTAGGG]4 oligonucleotide, (S)-telomestatin, like (R)-telomestatin, induced an antiparallel G-quadruplex structure. The melting temperature (Tm) value of the (S)-isomer complex was greater than that of the (R)-telomestatin complex. Therefore, it is concluded that the stereochemistry of the thiazoline of telomestatin is important to the binding ability of a G-quadruplex binder, and (S)-telomestatin as a G-quadruplex binder is more potent than the natural product.
(S)-泰洛美司汀(1)的立体异构体的全合成已经完成。(S)-泰洛美司汀的效力是天然产物(R)-泰洛美司汀的四倍,后者是此前报道的最有效的端粒酶抑制剂。在具有随机结构单链d[TTAGGG]4寡核苷酸的复合物的圆二色光谱分析中,(S)-泰洛美司汀与(R)-泰洛美司汀一样,诱导了反平行G-四联体结构。(S)-异构体复合物的熔化温度(Tm)值大于(R)-泰洛美司汀复合物的熔化温度(Tm)值。因此,可以得出结论,泰洛美司汀噻唑啉的立体化学对于G-四联体结合剂的结合能力非常重要,并且(S)-泰洛美司汀作为G-四联体结合剂比天然产物更有效。