Inhibitory mechanism of reveromycin A at the tRNA binding site of a class I synthetase.

Inhibitory mechanism of reveromycin A at the tRNA binding site of a class I synthetase.
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白藜芦醇 A 对 I 类合成酶 tRNA 结合位点的抑制机制

DOI:
10.1038/s41467-021-21902-0
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发表时间:
2021-03-12
影响因子:
16.6
通讯作者:
Zhou H
Zhou H
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chen B;Luo S;Zhang S;Ju Y;Gu Q;Xu J;Yang XL;Zhou H

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聚酮化合物天然产物回复霉素A(reveromycin A,RM-A)通过选择性抑制真核细胞质异亮氨酰-tRNA合成酶(IleRS)而表现出抗真菌、抗癌、抗骨转移、抗牙周炎和抗骨质疏松的活性。本文中,共晶体结构表明RM-A分子通过部分模拟tRNAIle的结合而占据Saccharomyces gleIleRS(ScIleRS)的底物tRNAIle结合位点。RM-A结合由共纯化的中间产物异亮氨酰-腺苷酸(Ile-AMP)促进。结合试验证实,RM-A与tRNAIle竞争,同时与l-异亮氨酸或中间类似物Ile-AMS协同结合ScIleRS的氨酰化口袋。这项研究强调了I类氨酰-tRNA合成酶的罗斯曼折叠催化结构域的巨大tRNA结合位点可以被小分子靶向。这一发现将为未来的合理药物设计提供信息。
The polyketide natural product reveromycin A (RM-A) exhibits antifungal, anticancer, anti-bone metastasis, anti-periodontitis and anti-osteoporosis activities by selectively inhibiting eukaryotic cytoplasmic isoleucyl-tRNA synthetase (IleRS). Herein, a co-crystal structure suggests that the RM-A molecule occupies the substrate tRNAIlebinding site ofSaccharomyces cerevisiaeIleRS (ScIleRS), by partially mimicking the binding of tRNAIle. RM-A binding is facilitated by the copurified intermediate product isoleucyl-adenylate (Ile-AMP). The binding assays confirm that RM-A competes with tRNAIlewhile binding synergistically withl-isoleucine or intermediate analogue Ile-AMS to the aminoacylation pocket ofScIleRS. This study highlights that the vast tRNA binding site of the Rossmann-fold catalytic domain of class I aminoacyl-tRNA synthetases could be targeted by a small molecule. This finding will inform future rational drug design.
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