Ammosamides EâF (1â2), are amidine analogs of the ammosamide family of alkaloids isolated from a marine-derived Streptomyces variabilis. Further studies with S. variabilis revealed a variety of aryl and alkyl amines added into the fermentation media could be efficiently incorporated into the ammosamide framework to generate a library of precursor-directed amidine analogs, ammosamides GâP (9â18). We demonstrate that the amines are introduced via non-enzymatic addition to the iminium ion of ammosamide C. Biological evaluation of the amidine analogs against quinone reductase 2 (QR2) showed low nM potency for a number of analogs. When tested for in vivo activity against a panel of non-small cell lung cancer (NSCLC) cell-lines there was a clear increase in potency by incorporation of lipophilic alkylamines, with the most potent compounds having sub μM IC50 values (0.4 to 0.8 μM).
氨基酰胺 EâF (1â2)是从源自海洋的变异链霉菌中分离出来的
氨基酰胺类
生物碱。对变异链霉菌的进一步研究表明,添加到发酵
培养基中的各种芳基和烷基胺可以有效地与
氨基酰胺框架结合,从而生成一个前体导向的脒类似物库,即
氨基酰胺 GâP (9â18)。我们证明,
氨基是通过与
氨基磺酰胺 C 的亚
氨基离子进行非酶加成而引入的。针对醌还原酶 2(QR2)对脒类似物进行的
生物学评估显示,一些类似物具有低 nM 的效力。在对一组非小细胞肺癌(NSCLC)
细胞系进行体内活性测试时,通过加入亲脂性烷基胺,其效力明显增强,最有效的化合物的 IC50 值低于 ¼M(0.4 至 0.8 ¼M)。