Sinefungin VA and dehydrosinefungin V, new antitrypanosomal antibiotics produced by Streptomyces sp. K05-0178
作者:Megumi Niitsuma、Junko Hashida、Masato Iwatsuki、Mihoko Mori、Aki Ishiyama、Miyuki Namatame、Aki Nishihara-Tsukashima、Atsuko Matsumoto、Yoko Takahashi、Haruki Yamada、Kazuhiko Otoguro、Kazuro Shiomi、Satoshi Ōmura
DOI:10.1038/ja.2010.102
日期:2010.11
Two new nucleotide antibiotics, named sinefungin VA and dehydrosinefungin V, were separated by cation exchange column chromatography and purified by HPLC from the culture broth of Streptomyces sp. K05-0178, together with the known antibiotics, sinefungin, dehydrosinefungin and KSA-9342. The structures of the two novel sinefungin analogs were elucidated by spectroscopic studies, including various NMR and advanced peptide chemical methods. Sinefungin VA consists of adenosine and ornithylvalylalanine, whereas dehydrosinefungin V consists of 4â²,5â²-dehydroadenosine and ornithylvaline. Sinefungin VA showed potent antitrypanosomal activity with an IC50 value of 0.0026âμgâmlâ1 in vitro without cytotoxicity against MRC-5 cells. Dehydrosinefungin V showed moderate antitrypanosomal activity (IC50=0.15âμgâmlâ1).
用阳离子交换柱色谱法从链霉菌 K05-0178 的培养液中分离并用高效液相色谱法纯化了两种新的核苷酸抗生素,分别命名为正银霉素 VA 和脱氢正银霉素 V,以及已知的抗生素正银霉素、脱氢正银霉素和 KSA-9342。通过光谱研究,包括各种核磁共振和先进的肽化学方法,阐明了这两种新型辛弗宁类似物的结构。辛弗宁 VA 由腺苷和鸟氨酰缬氨酸组成,而脱氢辛弗宁 V 由 4â²,5â²-脱氢腺苷和鸟氨酰缬氨酸组成。辛弗宁 VA 具有很强的抗盘虫活性,体外 IC50 值为 0.0026δ¼gâmlâ1,对 MRC-5 细胞无细胞毒性。去氢银环菌素 V 显示出中等程度的抗盘虫活性(IC50=0.15δ¼gâmlâ1)。