Spoxazomicin D and Oxachelin C, Potent Neuroprotective Carboxamides from the Appalachian Coal Fire-Associated Isolate <i>Streptomyces</i> sp. RM-14-6
作者:Khaled A. Shaaban、Meredith A. Saunders、Yinan Zhang、Tuan Tran、Sherif I. Elshahawi、Larissa V. Ponomareva、Xiachang Wang、Jianjun Zhang、Gregory C. Copley、Manjula Sunkara、Madan K. Kharel、Andrew J. Morris、James C. Hower、Matthew S. Tremblay、Mark A. Prendergast、Jon S. Thorson
DOI:10.1021/acs.jnatprod.6b00948
日期:2017.1.27
structure elucidation of six new bacterial metabolites [spoxazomicin D (2), oxachelins B and C (4, 5), and carboxamides 6–8] and 11 previously reported bacterial metabolites (1, 3, 9–12a, and 14–18) from Streptomyces sp. RM-14-6 is reported. Structures were elucidated on the basis of comprehensive 1D and 2D NMR and mass spectrometry data analysis, along with direct comparison to synthetic standards
的六个新的细菌代谢物的分离和结构鉴定[spoxazomicin d(2),oxachelins B和C(4,5),和羧酰胺6 - 8 ]和11以前报道细菌代谢物(1,3,9 - 12A,和14 – 18)来自链霉菌属。报告了RM-14-6。分别鉴定综合1D和2D NMR和质谱分析数据的基础上,以直接比较合成标准沿着2,11,和12A,b。首次还提供了已知代谢物莱诺霉素(9)和莱诺霉素钠盐(10)的完整2D NMR分配。对比分析也为一些先前报道的推定的含氮丙啶化合物[以马杜拉他汀A1,B1,C1(也称为MBJ-0034)和MBJ-0035]为酚-二氢恶唑的结构修订提供了基础。生物活性分析(包括抗菌,抗真菌,癌细胞系细胞毒性,未折叠的蛋白应答(UPR)调节和EtOH损伤神经保护作用)显示2和5是有效的神经保护剂和来诺霉素(9)及其钠盐(10)作为有效的UPR调节剂,突出了酚恶唑啉/水杨酸酯和聚醚药效团的新功能。