Validation and Invalidation of SARS-CoV-2 Papain-like Protease Inhibitors.

Validation and Invalidation of SARS-CoV-2 Papain-like Protease Inhibitors.
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SARS-CoV-2木瓜蛋白酶样蛋白酶抑制剂的验证和失效。

DOI:
10.1021/acsptsci.1c00240
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发表时间:
2022-02-11
影响因子:
--
通讯作者:
Wang J
Wang J
中科院分区:
其他
文献类型:
--
作者:
Ma C;Wang J

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SARS-CoV-2编码两种病毒半胱氨酸蛋白酶,主要蛋白酶(Mpro)和木瓜蛋白酶样蛋白酶(PLpro),这两种蛋白酶都是经过验证的抗病毒药物靶标。PLpro参与病毒多聚蛋白的切割以及通过从宿主蛋白质中去除泛素和干扰素刺激的基因产物15(ISG 15)的免疫调节。因此,瞄准PLpro可能是一种双管齐下的方法。最近通过高通量筛选,包括YM 155、隐丹参酮、丹参酮I、二氢丹参酮I、丹参酮IIA、SJB 2 -043、6-硫鸟嘌呤和6-巯基嘌呤的几个化合物被鉴定为SARS-CoV-2 PLpro抑制剂。在这项研究中,我们的目的是验证/无效的PLpro抑制剂使用PLpro靶向特异性测定,包括酶FRET测定,热位移结合测定(TSA),和基于细胞的FlipGFP测定的组合。总的来说,我们的结果表明,所有测试的化合物在TSA结合测定中没有显示结合或导致PLpro变性,这可以解释它们在FRET测定中的弱酶抑制。此外,如FlipGFP测定所揭示的,没有化合物显示细胞PLpro抑制。因此,需要更多的努力来寻找有效的和特异性的SARS-CoV-2 PLpro抑制剂。
SARS-CoV-2 encodes two viral cysteine proteases, the main protease (Mpro) and the papain-like protease (PLpro), both of which are validated antiviral drug targets. PLpro is involved in the cleavage of viral polyproteins as well as immune modulation by removing ubiquitin and interferon-stimulated gene product 15 (ISG15) from host proteins. Therefore, targeting PLpro might be a two-pronged approach. Several compounds including YM155, cryptotanshinone, tanshinone I, dihydrotanshinone I, tanshinone IIA, SJB2-043, 6-thioguanine, and 6-mercaptopurine were recently identified as SARS-CoV-2 PLpro inhibitors through high-throughput screenings. In this study, we aim to validate/invalidate the reported PLpro inhibitors using a combination of PLpro target-specific assays including enzymatic FRET assay, thermal shift binding assay (TSA), and cell-based FlipGFP assay. Collectively, our results showed that all compounds tested either did not show binding or led to denaturation of PLpro in the TSA binding assay, which might explain their weak enzymatic inhibition in the FRET assay. In addition, none of the compounds showed cellular PLpro inhibition as revealed by the FlipGFP assay. Therefore, more efforts are needed to search for potent and specific SARS-CoV-2 PLpro inhibitors.
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