Cell-based screening of extracts of natural sources to search for inhibitors of the ubiquitin-proteasome system and identification of proteasome inhibitors from the fungus Remotididymella sp.

Cell-based screening of extracts of natural sources to search for inhibitors of the ubiquitin-proteasome system and identification of proteasome inhibitors from the fungus Remotididymella sp.
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基于细胞的天然来源提取物筛选,以寻找泛素-蛋白酶体系统抑制剂,并鉴定来自真菌 Remotididymella sp 的蛋白酶体抑制剂。

DOI:
10.1016/j.bmcl.2022.128566
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发表时间:
2022
影响因子:
2.7
通讯作者:
Tsukamoto Sachiko
Tsukamoto Sachiko
中科院分区:
医学4区
文献类型:
--
作者:
Nishimura Soichiro;Hitora Yuki;Kawahara Teppei;Tanabe Mika;Ogata Eisuke;Kato Hikaru;Srikoon Pattaravadee;Watanabe Takashi;Tsukamoto Sachiko

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泛素-蛋白酶体系统(UPS)调节选择性蛋白质降解以维持蛋白质稳态。抑制UPS依赖的蛋白质降解的小分子是有前途的抗肿瘤药物。我们报告了一种基于细胞的发光检测方法,使用表达缺氧诱导因子1 α(HIF-1 α)的氧化酶融合氧依赖性破坏结构域(ODD)的HeLa细胞。ODD被UPS降解,并且该测定系统可以帮助鉴定抑制UPS的任一过程的天然产物,包括泛素化/去泛素化和蛋白酶体降解。该报告基因测定可以排除提取物中的着色或荧光化合物的影响,从而导致有效的高通量处理。对15,025种天然来源提取物的筛选鉴定了真菌Remotididymellasp的培养物提取物。(18F02908)。生物测定引导的分离产生了两种新的聚酮化合物,蜜胺A(1)和B(2),以及细球蛋白二酮(3)及其丙酮加合物4。化合物1具有前所未有的苯并[g]异喹啉-8,10-二酮骨架。生物活性评价表明,这些聚酮化合物抑制蛋白酶体的蛋白水解。这是第一次报告,从天然来源的蛋白酶体抑制剂的鉴定使用基于细胞的报告基因检测靶向UPS抑制剂。
The ubiquitin–proteasome system (UPS) regulates selective protein degradation to maintain protein homeostasis. Small molecules that inhibit the UPS-dependent protein degradation are promising anti-tumor agents. We report a cell-based luminescent assay using HeLa cells expressing luciferase-fused oxygen-dependent destruction domain (ODD) of hypoxia-inducible factor 1 α (HIF-1 α). ODD is degraded by the UPS and this assay system can aid in the identification of natural products that inhibit either process of the UPS, including ubiquitination/deubiquitination and proteasomal degradation. This reporter assay can exclude the influences of coloring or fluorescent compounds in extracts, thereby leading to effective high-throughput processing. The screening of 15,025 extracts of natural sources identified the culture extract of the fungusRemotididymellasp. (18F02908). Bioassay-guided isolation yielded two new polyketides, mellains A (1) and B (2), together with leptosphaerodione (3) and its acetone adduct4. Compound1was revealed to have an unprecedented benzo[g]isoquinoline-8,10-dione skeleton. Evaluation of the biological activities demonstrated that these polyketides inhibit the proteasomal proteolysis. This is the first report of the identification of proteasome inhibitors from natural sources using a cell-based reporter assay targeting UPS inhibitors.
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