Medium optimization of Streptomyces sp. 17944 for tirandamycin B production and isolation and structural elucidation of tirandamycins H, I and J.

Medium optimization of Streptomyces sp. 17944 for tirandamycin B production and isolation and structural elucidation of tirandamycins H, I and J.
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DOI:
10.1038/ja.2013.50
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发表时间:
2014-01
期刊:
The Journal of antibiotics
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其他
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我们最近从链霉菌中分离到了替兰霉素()B。17944是一种马来丝虫天冬氨酸受体(BmAsnRs)抑制剂,能有效杀死马来丝虫成虫,对人肝细胞没有普遍的细胞毒性。我们现在报告(I)链霉菌代谢产物的比较。17944在六种不同的介质中,(Ii)确定一种能够产生B作为唯一代谢物的培养基,并提高滴度,以及(Iii)分离和结构鉴定三个新的同系物。这些发现为B作为BmAsnRS抑制剂的构效关系提供了新的见解,突出了δ-羟甲基-α,β-环氧酮部分作为关键的药效团,并将极大地促进生产和分离足够数量的B,用于进一步的机制和临床前研究,以推进B作为抗丝虫病药物先导的候选资格。目前的研究也是一个很好的提醒,传统的培养基和发酵优化应该继续非常有效地改善代谢物流量和效价。
We have recently isolated tirandamycin (TAM) B from Streptomyces sp. 17944 as a Brugia malayi AsnRS (BmAsnRS) inhibitor that efficiently kills the adult B. malayi parasites and does not exhibit general cytotoxicity to human hepatic cells. We now report (i) the comparison of metabolite profiles of S. sp. 17944 in six different media, (ii) identification of a medium enabling the production of TAM B as essentially the sole metabolite, and with improved titer, and (iii) isolation and structural elucidation of three new TAM congeners. These findings shed new insights into the structure-activity relationship of TAM B as a BmAsnRS inhibitor, highlighting the δ-hydroxymethyl-α,β-epoxyketone moiety as the critical pharmacophore, and should greatly facilitate the production and isolation of sufficient quantities of TAM B for further mechanistic and preclinical studies to advance the candidacy of TAM B as an antifilarial drug lead. The current study also serves as an excellent reminder that traditional medium and fermentation optimization should continue to be very effective in improving metabolite flux and titer.
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