Article(id=1238813312654299470, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1238813307784712441, articleNumber=null, orderNo=null, doi=10.13343/j.cnki.wsxb.20250733, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1758902400000, receivedDateStr=2025-09-27, revisedDate=null, revisedDateStr=null, acceptedDate=1761580800000, acceptedDateStr=2025-10-28, onlineDate=1773285709775, onlineDateStr=2026-03-12, pubDate=1772553600000, pubDateStr=2026-03-04, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773285709775, onlineIssueDateStr=2026-03-12, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773285709775, creator=13701087609, updateTime=1773285709775, updator=13701087609, issue=Issue{id=1238813307784712441, tenantId=1146029695717560320, journalId=1192105938417971205, year='2026', volume='66', issue='3', pageStart='961', pageEnd='1466', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773285708614, creator=13701087609, updateTime=1773291912509, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1238839328915378858, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1238813307784712441, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1238839328915378859, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1238813307784712441, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1007, endPage=1025, ext={EN=ArticleExt(id=1238813313103090034, articleId=1238813312654299470, tenantId=1146029695717560320, journalId=1192105938417971205, language=EN, title=Advances in coronavirus main protease functions and inhibitor screening methods, columnId=1192149543727808575, journalTitle=Acta Microbiologica Sinica, columnName=Review, runingTitle=null, highlight=null, articleAbstract=

Coronaviruses pose a serious threat to human and animal health. Their main protease (Mpro) plays a critical role in both the viral life cycle and host immune regulation, serving as a key target for the development of broad-spectrum anti-coronavirus drugs. The core function of Mpro lies in its specific cleavage of viral polyproteins pp1a and pp1ab to release functional non-structural proteins (NSPs), thereby driving the assembly of the viral replication/transcription complex. Additionally, Mpro can target and cleave key molecules in host immune signaling pathways, facilitating viral immune evasion. Given its dual roles and highly conserved catalytic center, the research on Mpro has become a major focus in the field. This review systematically outlines the structural features and functional diversity of Mpro, with an emphasis on its catalytic mechanism in the viral replication cycle and its role in mediating immune suppression. Furthermore, this article details the screening methods and design strategies for Mpro inhibitors, aiming to offer theoretical foundations and novel insights for the development of anti-coronavirus drugs targeting this critical protein.

, correspAuthors=Yu’e WANG, authorNote=null, correspAuthorsNote=
*E-mail:
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冠状病毒是严重威胁人类与动物健康的病原体。主蛋白酶(main protease, Mpro)在病毒生命周期及宿主免疫调节中均发挥着重要作用,是开发广谱抗冠状病毒药物的关键靶点。Mpro的核心作用在于特异性切割病毒多聚蛋白pp1a和pp1ab,以释放功能性非结构蛋白(non-structural proteins, NSPs),进而驱动病毒复制/转录复合体的组装。此外,Mpro能够靶向切割宿主免疫信号通路中的关键分子,有利于病毒实现免疫逃逸。鉴于其功能的双重性以及催化中心的高度保守性,针对Mpro的研究已成为该领域的热点。本文系统概述了Mpro的结构特征与功能多样性,重点论述了其在病毒复制周期中的催化机制及介导免疫抑制的作用,进而详细探讨了Mpro抑制剂的筛选方法与设计策略,为针对该靶点的抗冠状病毒药物研发提供了理论依据和新思路。

, correspAuthors=王玉娥, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=8w6EeqSH/k3PH8dZyBiuHA==, magXml=jWLWhaRmDFueuBtCS9yokQ==, pdfUrl=null, pdf=kfCPQ+TX83VMT5pNNZvDQg==, pdfFileSize=2219417, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=Y/vg3TEO6Rd2KWxJVYqFFw==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=BBaVeOo1ZA0eA46sLsrdCQ==, mapNumber=null, authorCompany=null, fund=null, authors=

作者贡献声明

熊谋康:构思与设计、撰写初稿和修改;朱君海:监督指导;王玉娥:资金获取、论文修改和监督指导。

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Nature Communications, 2021, 12: 3061., articleTitle=Inhibition mechanism of SARS-CoV-2 main protease by ebselen and its derivatives, refAbstract=null)], funds=[Fund(id=1238891101097087483, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, awardId=CSTB2024NSCQ-MSX0467, language=EN, fundingSource=Natural Science Foundation of Chongqing(CSTB2024NSCQ-MSX0467), fundOrder=null, country=null), Fund(id=1238891101197750789, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, awardId=CSTB2024NSCQ-MSX0467, language=CN, fundingSource=重庆市自然科学基金(CSTB2024NSCQ-MSX0467), fundOrder=null, country=null), Fund(id=1238891101340357134, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, awardId=SWU-KR22036, language=EN, fundingSource=Fundamental Research Funds for the Central Universities(SWU-KR22036), fundOrder=null, country=null), Fund(id=1238891101457797657, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, awardId=SWU-KR22036, language=CN, fundingSource=中央高校基本科研业务费专项资金(SWU-KR22036), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1238891095065677989, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, xref=null, ext=[AuthorCompanyExt(id=1238891095069872294, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, companyId=1238891095065677989, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=College of Veterinary Medicine, Southwest University, Chongqing, China), AuthorCompanyExt(id=1238891095082455208, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, companyId=1238891095065677989, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=西南大学 动物医学院,重庆)])], figs=[ArticleFig(id=1238891097116692765, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=EN, label=Figure 1, caption=The 3D structure of SARS-CoV-2 Mpro. Presented from two distinct perspectives, one monomer in the dimer is displayed in yellow, while the other monomer is shown in light blue and marked with an asterisk (*); PDB ID: 7EN8., figureFileSmall=4bBQKCy2GJ7OnqVJshKi/g==, figureFileBig=2+ciTxV4gYFVs5VeoEmqvw==, tableContent=null), ArticleFig(id=1238891097229938984, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=CN, label=图1, caption=SARS-CoV-2 Mpro三维结构。从2个不同视角呈现,二聚体中一个单体以黄色显示,另一个单体则以浅蓝显示并标注星号(*);PDB ID: 7EN8。, figureFileSmall=4bBQKCy2GJ7OnqVJshKi/g==, figureFileBig=2+ciTxV4gYFVs5VeoEmqvw==, tableContent=null), ArticleFig(id=1238891097322213681, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=EN, label=Figure 2, caption=Hydrolysis mechanism of SARS-CoV-2 Mpro[22]. Amino acids of the catalytic dyad and the substrate are depicted in blue and red, respectively. Created with BioGDP.com[23]., figureFileSmall=s6SZPy/YQWm9CSGtygBZYw==, figureFileBig=y5On15eK2Pm249d4pkhRkg==, tableContent=null), ArticleFig(id=1238891097427071289, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=CN, label=图2, caption=冠状病毒Mpro的催化机制[22]。催化二元组与底物氨基酸分别用蓝色和红色标示。, figureFileSmall=s6SZPy/YQWm9CSGtygBZYw==, figureFileBig=y5On15eK2Pm249d4pkhRkg==, tableContent=null), ArticleFig(id=1238891098882494788, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=EN, label=Figure 3, caption=The virtual screening for identifying Mpro inhibitors. ADMET: Absorption, distribution, metabolism, excretion, and toxicity. Created with BioGDP.com., figureFileSmall=lJ5QIO/395v3I+fNALuCnA==, figureFileBig=XUFrHBNpDMxyRZO5Tqq/5Q==, tableContent=null), ArticleFig(id=1238891098974769484, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=CN, label=图3, caption=虚拟筛选法筛选Mpro抑制剂, figureFileSmall=lJ5QIO/395v3I+fNALuCnA==, figureFileBig=XUFrHBNpDMxyRZO5Tqq/5Q==, tableContent=null), ArticleFig(id=1238891099104792913, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=EN, label=Figure 4, caption=LiP-MS screening for Mpro inhibitors. 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Created with BioGDP.com., figureFileSmall=2m1Rta4YaISROTxDmeDDDQ==, figureFileBig=BuDMN9y592tjWT7V+8+5RQ==, tableContent=null), ArticleFig(id=1238891099431948656, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=CN, label=图5, caption=ABPP鉴定Mpro药物靶点, figureFileSmall=2m1Rta4YaISROTxDmeDDDQ==, figureFileBig=BuDMN9y592tjWT7V+8+5RQ==, tableContent=null), ArticleFig(id=1238891099545194878, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=EN, label=Figure 6, caption=Mpro inhibitor screening method based on the FRET principle. Created with BioGDP.com., figureFileSmall=NxVdMwjq4kGTmRFy6b/lgQ==, figureFileBig=RFH/vBMPjHUHDPtcngmoSQ==, tableContent=null), ArticleFig(id=1238891099658441098, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=CN, label=图6, caption=基于FRET原理的Mpro抑制剂筛选法, figureFileSmall=NxVdMwjq4kGTmRFy6b/lgQ==, figureFileBig=RFH/vBMPjHUHDPtcngmoSQ==, tableContent=null), ArticleFig(id=1238891099763298708, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=EN, label=Figure 7, caption=Screening of Mpro inhibitors based on the luciferase reporter screening assay[83]. 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Structural domains and the active site of the coronavirus Mpro

, figureFileSmall=null, figureFileBig=null, tableContent=
Virus genusVirusDomainActive site
αHCoV-229EⅠ (8-99), Ⅱ (100-183), long loop (184-199), Ⅲ (200-300)His41 and Cys144[10-13]
FIPV-
PEDV-
TGEVⅠ (8-100), Ⅱ (101-183), long loop (184-199), Ⅲ (200-302)
βMERS-CoVⅠ (8-101), Ⅱ (102-184), long loop (185-200), Ⅲ (201-303)His41 and Cys148[14]
SARS-CoVHis41 and Cys145[15-16]
SARS-CoV-2
γIBVⅠ (3-99), Ⅱ (100-182), long loop (183-198), Ⅲ (199-307)His41 and Cys143[17]
δPDCoVⅠ (1-97), Ⅱ (98-186), long loop (187-199), Ⅲ (200-304)His41 and Cys144[18]
), ArticleFig(id=1238891100618936782, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=CN, label=表1, caption=

冠状病毒Mpro结构域及活性位点

, figureFileSmall=null, figureFileBig=null, tableContent=
Virus genusVirusDomainActive site
αHCoV-229EⅠ (8-99), Ⅱ (100-183), long loop (184-199), Ⅲ (200-300)His41 and Cys144[10-13]
FIPV-
PEDV-
TGEVⅠ (8-100), Ⅱ (101-183), long loop (184-199), Ⅲ (200-302)
βMERS-CoVⅠ (8-101), Ⅱ (102-184), long loop (185-200), Ⅲ (201-303)His41 and Cys148[14]
SARS-CoVHis41 and Cys145[15-16]
SARS-CoV-2
γIBVⅠ (3-99), Ⅱ (100-182), long loop (183-198), Ⅲ (199-307)His41 and Cys143[17]
δPDCoVⅠ (1-97), Ⅱ (98-186), long loop (187-199), Ⅲ (200-304)His41 and Cys144[18]
), ArticleFig(id=1238891100736377303, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=EN, label=Table 2, caption=

Analysis of host protein cleavage sites by coronavirus

, figureFileSmall=null, figureFileBig=null, tableContent=
Virus genusVirusHost proteinCleavage site
αHCoV-229ENEMO[4]Q83, Q205, and Q231
FIPVNEMO[53]Q132, Q205, and Q231
PEDV

NEMO[51]

HDAC6[54]

Q231

Q519

TGEVHDAC6[54]Q519
βMERS-CoVMAVS[55]-
SARS-CoVNEMO[52]E152, Q205, and Q231
SARS-CoV-2

NEMO[52]

RIG-I[56]

E152, Q205, and Q231

Q10

δPDCoV

NEMO[50]

STAT2[57]

IFIT3[58]

HDAC6[54]

Q231

Q685 and Q758

Q406

Q519

), ArticleFig(id=1238891100887372263, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1238813312654299470, language=CN, label=表2, caption=

冠状病毒对宿主蛋白切割位点分析

, figureFileSmall=null, figureFileBig=null, tableContent=
Virus genusVirusHost proteinCleavage site
αHCoV-229ENEMO[4]Q83, Q205, and Q231
FIPVNEMO[53]Q132, Q205, and Q231
PEDV

NEMO[51]

HDAC6[54]

Q231

Q519

TGEVHDAC6[54]Q519
βMERS-CoVMAVS[55]-
SARS-CoVNEMO[52]E152, Q205, and Q231
SARS-CoV-2

NEMO[52]

RIG-I[56]

E152, Q205, and Q231

Q10

δPDCoV

NEMO[50]

STAT2[57]

IFIT3[58]

HDAC6[54]

Q231

Q685 and Q758

Q406

Q519

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冠状病毒主蛋白酶功能及抑制剂筛选方法研究进展
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熊谋康 , 朱君海 , 王玉娥 *
微生物学报 | 综述 2026,66(3): 1007-1025
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微生物学报 | 综述 2026, 66(3): 1007-1025
冠状病毒主蛋白酶功能及抑制剂筛选方法研究进展
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熊谋康, 朱君海, 王玉娥*
作者信息
  • 西南大学 动物医学院,重庆
Advances in coronavirus main protease functions and inhibitor screening methods
Moukang XIONG, Junhai ZHU, Yu’e WANG*
Affiliations
  • College of Veterinary Medicine, Southwest University, Chongqing, China
出版时间: 2026-03-04 doi: 10.13343/j.cnki.wsxb.20250733
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冠状病毒是严重威胁人类与动物健康的病原体。主蛋白酶(main protease, Mpro)在病毒生命周期及宿主免疫调节中均发挥着重要作用,是开发广谱抗冠状病毒药物的关键靶点。Mpro的核心作用在于特异性切割病毒多聚蛋白pp1a和pp1ab,以释放功能性非结构蛋白(non-structural proteins, NSPs),进而驱动病毒复制/转录复合体的组装。此外,Mpro能够靶向切割宿主免疫信号通路中的关键分子,有利于病毒实现免疫逃逸。鉴于其功能的双重性以及催化中心的高度保守性,针对Mpro的研究已成为该领域的热点。本文系统概述了Mpro的结构特征与功能多样性,重点论述了其在病毒复制周期中的催化机制及介导免疫抑制的作用,进而详细探讨了Mpro抑制剂的筛选方法与设计策略,为针对该靶点的抗冠状病毒药物研发提供了理论依据和新思路。

冠状病毒  /  主蛋白酶  /  抑制剂筛选方法  /  抗病毒策略

Coronaviruses pose a serious threat to human and animal health. Their main protease (Mpro) plays a critical role in both the viral life cycle and host immune regulation, serving as a key target for the development of broad-spectrum anti-coronavirus drugs. The core function of Mpro lies in its specific cleavage of viral polyproteins pp1a and pp1ab to release functional non-structural proteins (NSPs), thereby driving the assembly of the viral replication/transcription complex. Additionally, Mpro can target and cleave key molecules in host immune signaling pathways, facilitating viral immune evasion. Given its dual roles and highly conserved catalytic center, the research on Mpro has become a major focus in the field. This review systematically outlines the structural features and functional diversity of Mpro, with an emphasis on its catalytic mechanism in the viral replication cycle and its role in mediating immune suppression. Furthermore, this article details the screening methods and design strategies for Mpro inhibitors, aiming to offer theoretical foundations and novel insights for the development of anti-coronavirus drugs targeting this critical protein.

coronavirus  /  main protease  /  inhibitor screening methods  /  antiviral strategies
熊谋康, 朱君海, 王玉娥. 冠状病毒主蛋白酶功能及抑制剂筛选方法研究进展. 微生物学报, 2026 , 66 (3) : 1007 -1025 . DOI: 10.13343/j.cnki.wsxb.20250733
Moukang XIONG, Junhai ZHU, Yu’e WANG. Advances in coronavirus main protease functions and inhibitor screening methods[J]. Acta Microbiologica Sinica, 2026 , 66 (3) : 1007 -1025 . DOI: 10.13343/j.cnki.wsxb.20250733
冠状病毒是严重威胁人类与动物健康的重要病原体,其引发的疾病谱系广泛,对全球公共卫生构成持续性挑战[1]。在病毒与宿主的相互作用过程中,宿主的先天免疫反应是抵御病毒入侵的首道防线,而冠状病毒则进化出复杂的策略以逃逸免疫清除,二者间的动态博弈是决定感染进程的关键因素。在这一过程中,病毒编码的主蛋白酶(main protease, Mpro),又称3C样蛋白酶(3-chymotrypsin-like protease, 3CLpro),发挥着枢纽作用:一方面,它通过切割病毒多聚蛋白pp1a和pp1ab,产生病毒复制与转录所必需的非结构蛋白(non-structural proteins, NSPs),是病毒生命周期的核心执行者;另一方面,它还可直接靶向切割宿主天然免疫信号通路中的关键分子[如核因子κB必需调节因子(nuclear factor kappa-B essential modulator, NEMO)、线粒体抗病毒信号蛋白(mitochondrial antiviral signaling protein, MAVS)等],从而抑制干扰素的产生与信号转导,成为病毒实现免疫逃逸的新型“武器”[2-4]。鉴于Mpro在病毒复制与免疫调节方面具有双重功能,且其活性位点在冠状病毒属内高度保守,它被公认为开发广谱、高效抗病毒药物的理想靶点。本文系统阐述了Mpro的结构特征与功能多样性,重点剖析了其在病毒复制周期中的催化机制及免疫调节功能,并深入探讨了Mpro抑制剂的筛选策略与研发进展,以期为抗冠状病毒药物研发提供理论依据和新思路。
目前,多种高致病性冠状病毒持续存在且存在新发风险,如人类冠状病毒229E (human coronavirus 229E, HCoV-229E)、严重急性呼吸综合征冠状病毒(severe acute respiratory syndrome coronavirus, SARS-CoV)、中东呼吸综合征冠状病毒(Middle East respiratory syndrome coronavirus, MERS-CoV)、猪德尔塔冠状病毒(porcine deltacoronavirus, PDCoV)、猪流行性腹泻病毒(porcine epidemic diarrhea virus, PEDV)、猪传染性胃肠炎病毒(porcine transmissible gastroenteritis virus, TGEV)、猫传染性腹膜炎病毒(feline infectious peritonitis virus, FIPV)、传染性支气管炎病毒(infectious bronchitis virus, IBV)等,这些病毒对全球公共卫生构成严峻挑战,也凸显了开发广谱抗病毒药物的紧迫性。任何能够精准干预病毒生命周期的环节均有望成为治疗的突破口[5]。本课题组Xiong等[6]前期研究证实,Ouabain和PST2238可减少PEDV对靶细胞的识别,进而抑制病毒复制。在众多病毒蛋白中Mpro因在冠状病毒属中序列和功能高度保守,且在病毒多聚蛋白加工与免疫逃逸中发挥核心作用,成为广谱药物开发的理想靶点[7]。因此,系统解析Mpro的结构与功能机制,推进靶向Mpro药物/抑制剂的研发,不仅有助于深化对冠状病毒致病机制的理解,也为应对当前及未来冠状病毒威胁提供了重要的策略方向。
冠状病毒Mpro是约33 kDa的关键病毒蛋白酶,其三维结构的解析为理解其功能与药物设计奠定了基础[8]。Jin等[9]首次通过X射线衍射法解析了SARS-CoV-2 Mpro的晶体结构,分辨率达2.16 Å (PDB ID:6LU7)。如图1所示,Mpro由3个结构域组成:结构域I (氨基酸残基8-101)和结构域II (残基102-184)以β-折叠结构为主,负责维持蛋白质的稳定与功能;结构域III (残基201-303)由α-螺旋簇构成,通过一段长环区(残基185-200)与结构域II连接,参与调控蛋白二聚化及稳定性;Mpro的活性中心位于结构域I和II之间的沟槽内,包含由Cys和His组成的催化二元体,以及S1′、S1、S2和S4等底物结合口袋[10] (冠状病毒Mpro结构域及活性位点见表1)。这些口袋中的关键残基,如S1′口袋的Leu27和Gly142,S1口袋的Phe139、His163、Glu166和His172,S2口袋的His41、Tyr53和Asp187,S4口袋的Leu167和Gln192,在感染人的冠状病毒Mpro中高度保守[19]。Zhou等[20]对冠状病毒Mpro序列进行比对表明,S2口袋中第49、54和189位(按SARS-CoV-2 Mpro编号)的氨基酸在α-CoVs中为T、Y和P,在β-CoVs中为M/L、Y和Q,在γ-CoVs和δ-CoVs中则为K、W和E;上述特征在冠状病毒属内高度保守,但在属间存在差异,体现出一定的属特异性。Mpro不仅在冠状病毒复制中发挥重要作用,更是连接病毒复制与药物干预策略的关键枢纽。理解Mpro结构是开发应对当前乃至未来冠状病毒威胁的广谱特效药物的基石。
从催化机制来看,Mpro催化活性依赖于Cys145-His41催化对的协同作用[21]。其基本过程包括:His41促进Cys145的-SH基团去质子化(图2),形成活化的硫醇盐中间体[21,24-25];该中间体随后对底物肽键的羰基碳发起亲核攻击,形成四面体过渡态;在His41的催化作用下促进N端产物的释放;最终涉及硫酯键裂解生成含C端的多肽水解产物[26-27]。这种催化机制在不同冠状病毒的Mpro中高度保守,确保了它们对病毒多聚蛋白的有效加工[28]
Mpro的成熟是一个精密的级联自切割过程。它以无活性的前体形式存在于多聚蛋白pp1a/pp1ab中,必须通过自切割释放自身才能获得活性,进而反式切割多聚蛋白上的其他位点,产生功能性NSPs。冠状病毒Mpro的剪切机制可分为2类:(1) Mpro在成熟过程中的自剪切机制,Mpro位于多聚蛋白上,在切割多聚蛋白前首先在N端进行自切割,随后在C端进行切割,进而从多聚蛋白中释放出来,形成具有完整活性的成熟Mpro[29];(2) Mpro的反式剪切机制,即Mpro在成熟以后,切割多聚蛋白使NSPs从多聚蛋白上释放[30]
冠状病毒Mpro的自切割过程需要膜结构的参与[31-32]。Mpro形成二聚体时具有最佳的催化功能,但在对多聚蛋白进行切割时可能以单体发挥作用[33]。其成熟机制涉及顺式与反式切割的协同:首先,2个未成熟的Mpro单体通过其N端前体结构域相互作用形成初始二聚体,从而介导N端自切割,此过程可能不依赖于完全成熟的酶[34-36]。对SARS-CoV-2 Mpro的高分辨率结构生物学研究为此提供了更清晰的证据。Noske等[37]发现,未成熟Mpro的N末端延伸会破坏S1-S3活性位点的正确构象并抑制二聚化;该研究证实,初始的N端切割可由单体通过顺式作用完成,而有效的二聚体形成则显著增强了这一过程,并伴随C端的进一步切割,最终产生结构稳定、功能完备的成熟Mpro二聚体;Mpro与C145S突变体共同作用可显著增强N末端切割与二聚体的形成,表明Mpro初始成熟过程涉及顺式与反式切割;最终N末端区域被完全切割并整合至多聚蛋白内部。包含C末端的活性位点区域完成成熟,Mpro多蛋白的C末端会采取特殊的旋转构象并与另一个成熟或半成熟Mpro活性位点结合;随后,完全成熟的Mpro形成并进一步加工病毒多聚蛋白[22]
Mpro是一个经历精密自激活的酶,从无活性前体到活性二聚体的成熟过程是整个病毒复制链的关键步骤。Mpro的二聚化效率与成熟速度直接调控病毒复制的组装进度,进而影响病毒载量和疾病进程,破坏Mpro成熟过程能从根本上削弱病毒的致病能力。针对这些环节进行干预,为开发更高效、更广谱、更安全的抗冠状病毒药物开辟了新途径。
冠状病毒NSPs具有多种生理功能,在病毒复制与转录过程中发挥着关键作用[38]。木瓜样蛋白酶(papain-like proteases, PLpro)和Mpro通过将多聚蛋白切割为成熟NSPs,进而在病毒复制和免疫逃逸中发挥核心作用[39-40]。具体而言,Mpro主要负责切割nsp4/nsp5、nsp5/nsp6、nsp6/nsp7、nsp7/nsp8、nsp8/nsp9、nsp9/nsp10、nsp10/nsp12、nsp12/nsp13、nsp13/nsp14、nsp14/nsp15、nsp15/nsp16在内的11个位点,这些切割位点在冠状病毒中保守[41]。这种通过多聚蛋白水解产生功能元件的机制是RNA病毒调控生理功能的重要策略。鉴于NSPs是构成复制转录复合体(replication-transcription complex, RTC)的关键组分,抑制Mpro活性可有效阻止RTC形成,从而抑制冠状病毒复制。
从作用机制上看,Mpro的切割序列以切割位点为中心,向N端和C端延伸形成P1、P2、P3、P4、P5及P1′、P2′、P3′、P4′、P5′等位点,这些位点与S2′、S1′、S1、S2、S4等多个底物结合口袋相互作用;其中,P1、P2和P1′位点保守性最高,决定底物特异性[42]。Mpro特异性识别并切割多聚蛋白中的典型序列Leu-Gln↓(Ser, Ala, Gly)。特别需指出的是,P1位点需为Gln残基,P1′位点偏好小侧链氨基酸,P2位点需具有长侧链的疏水残基(偏好Leu)[11,43]。基于此,Mpro抑制剂通过抑制Mpro切割活性可显著影响病毒复制[44]。此外,由于人类和动物体内不存在Mpro同源蛋白,针对Mpro的药物开发具有较低的脱靶风险。
鉴于Mpro在冠状病毒复制中不可或缺的地位及切割特性,它被视为一个极具前景的药物靶点。通过解析Mpro的功能与底物特异性能够指导药物的合理设计,这不仅对当前冠状病毒感染的治疗至关重要,也为应对未来新发冠状病毒疫情提供了抗病毒药物开发策略。
病毒感染会触发宿主免疫应答,其中I型干扰素(type I interferon, IFN-I)通过快速诱导产生以建立抗病毒状态。IFN-I在抑制病毒过程中起到关键作用,当宿主模式识别受体(pattern recognition receptors, PRRs)识别病毒组分后可迅速诱导其产生[45]。IFN-I信号通路通过激活转录因子,进而诱导干扰素刺激基因(interferon-stimulated genes, ISGs)的表达,从而抑制病毒复制并招募和激活免疫细胞[46-47]。然而,冠状病毒采用多种策略逃逸先天免疫,这些策略构成病毒免疫逃逸和适应宿主的基础。关键逃逸机制包括:(1) 形成双层膜囊泡隔离病毒核酸,避免其被PRRs识别;(2) 通过病毒蛋白直接降解天然免疫信号分子[48-49]。研究表明,Mpro介导的对IFN信号转导的抑制在冠状病毒中具有进化保守性[50-52]表2系统阐述了不同冠状病毒Mpro对宿主免疫信号关键介导因子的切割作用。综上所述,Mpro既调节冠状病毒复制,又通过调控宿主信号通路实现免疫逃逸[13]。作为病毒复制过程中至关重要的多功能酶,靶向Mpro的蛋白酶活性已成为治疗冠状病毒疾病的重要策略。
Mpro抑制剂根据结构特征可分为共价抑制剂、非共价抑制剂两大类。大多数肽类共价抑制剂具有肽骨架与高反应性弹头相结合的特征[59]。过渡态类似物通过模拟酶催化过程中形成的过渡态中间体来抑制Mpro活性,这类抑制剂通常具有较高的结合亲和力,能有效阻断酶催化过程。例如,基于α-酮酰胺的抑制剂与Cys145形成半硫缩醛中间体,从而抑制Mpro活性[19]
研究人员对冠状病毒Mpro抑制剂进行了深入研究,已提出多种候选药物方案,这些药物需满足低毒性、高溶解性和可逆性等要求[60]。共价抑制剂主要包括α-酮酰胺类[16]、腈类[61]、磺酸酯类[62-63]、迈克尔受体类[9]、醛类[64]及有机硒化合物[65]。这些抑制剂包含多种亲电弹头,如环氧环[66]、氟甲基[67]、肉桂酸酯[68]和乙烯基酯[69]
在已开发的共价抑制剂中帕昔洛韦(nirmatrelvir和ritonavir)将活性Mpro抑制剂与增强剂联合使用,协同提高药物疗效,从而有效抑制SARS-CoV-2复制[70-71]。奈玛特韦(nirmatrelvir,PF-07321332)的前体化合物为PF-07304814,是一种口服有效的Mpro抑制剂;该抑制剂对多种α和β冠状病毒Mpro均显示出高效的抑制活性,包括SARS-CoV、HKU1、OC43、MERS、229E和NL63[72-73]。值得注意的是,一些丙型肝炎病毒(hepatitis C virus, HCV)的抗病毒药物,如telaprevir、narlaprevir和boceprevir也显示出对Mpro的抑制能力[22]。在动物疾病治疗方面,靶向Mpro的肽类化合物GC376已成功用于抑制FIPV复制,并对鼬冠状病毒和貂冠状病毒表现出广谱抑制效果[74-76]
共价抑制剂通过形成稳定共价键延长药物作用时间,但伴随着潜在的毒性和脱靶效应;非共价抑制剂通过可逆的非共价相互作用与Mpro结合,降低了不良反应的风险,并可能提高对Mpro的选择性[77-78]。非共价抑制剂如S-217622 (ensitrelvir)[79]、Masitinib[80]、ML188[81]、WU-04 (mprosevir)[82]已成为靶向Mpro的具有前景的候选药物。对Mpro抑制剂的研究为抗冠状病毒药物的发现奠定了科学基础,并为未来可能出现的冠状病毒变种提供了潜在治疗策略。鉴于Mpro抑制剂的重要应用前景,高效、精准的抑制剂筛选方法已成为加速此类药物研发的关键环节。下文将系统综述目前广泛应用的Mpro抑制剂筛选策略。
Mpro抑制剂的筛选方法包括但不限于虚拟筛选(virtual screening)以及表型筛选等方法,这些方法在新抑制剂的发现和优化中发挥着重要作用。为拓展筛选高效广谱Mpro抑制剂的策略,本节将在戚海燕等[83]工作的基础上,重点介绍基于活性的蛋白质分析(activity-based protein profiling, ABPP)与有限蛋白水解-质谱法(limited proteolysis-mass spectrometry, LiP-MS)等新方法的应用。
虚拟筛选作为计算机辅助药物设计(computer-aided drug design, CADD)的关键技术,在丰富先导化合物结构骨架的同时,降低了新药研发的成本和周期。虚拟筛选通过构建化合物活性与结构的关系,运用计算机程序精准筛选大量天然产物库、上市药物库及小分子库,以发现潜在先导化合物。虚拟筛选主要分为基于结构的虚拟筛选和基于配体的虚拟筛选(图3):基于结构的虚拟筛选依赖Mpro的三维结构,通过分子对接模拟化合物与Mpro活性位点的相互作用,采用对接软件和评分函数来预测结合亲和力,并筛选出具有潜力的抑制剂[84-85];基于配体的虚拟筛选需已知活性分子的构效关系和药效团模型,寻找具有相似特征的化合物[86]。因此,虚拟筛选的关键在于理解Mpro的分子结构特征,并精准设定配体结合的筛选标准。具体而言,需整合分子对接评分、药效团匹配和分子动力学模拟等多维参数,以设定结合能阈值和构象稳定性的评判标准。基于Mpro的活性位点,采用虚拟筛选技术鉴定出ebselen和nirmatrelvir等具有潜在活性的化合物[9,87]。此外,Sharma等[88]基于SARS-CoV-2 Mpro的活性位点进行同源建模,并通过虚拟筛选方法发现多种已上市药物cobicistat、iopromide、cangrelor等可作为Mpro抑制剂,表明这些药物可能具有抗SARS-CoV-2的潜力。
有限蛋白水解质谱技术(LiP-MS)是一种用于鉴定小分子化合物与蛋白质相互作用位点的经典方法。LiP-MS的原理基于小分子药物与靶蛋白结合后会稳定蛋白结构,减少表面肽段被蛋白酶酶切的几率;通过对比药物处理组与对照组经非特异性蛋白酶处理后的酶切结果,LiP-MS能够精准鉴定与化合物结合的特异性肽段,并通过肽段比对与组装将这些肽段归属至特定靶蛋白(图4)[89]。LiP-MS方法适用于小分子的蛋白质及多肽靶标发现,为药物研发与机制研究提供了有力工具。
基于活性的蛋白质分析(ABPP)是一种由Cravatt团队开创的蛋白质组学技术,旨在研究酶的活性状态(图5)[90]。该技术通过评估酶活性来识别在疾病中失调的关键酶,进而指导针对这些酶活性的抑制剂开发[91]。该技术结合质谱和定量蛋白质组学,已广泛应用于药物靶标的发现。主要采用2种策略:直接富集策略通过活性探针与靶蛋白的共价结合,经点击化学连接报告基团后,利用质谱或荧光技术鉴定标记蛋白,从而分析氨基酸残基的反应活性,用于发现潜在的药物靶标;间接富集策略通过候选小分子与蛋白质组的预孵育,随后使用广谱活性探针标记未结合位点,并结合同位素定量技术评估小分子与氨基酸的结合特性,进而筛选先导化合物及其靶标蛋白。ABPP方法尤其适用于共价抑制剂和小分子药物靶蛋白的研究[92]。Moon等[93]利用ABPP成功发现并优化了一种靶向半胱氨酸的吡唑啉类共价抑制剂,该抑制剂能有效抑制多种冠状病毒Mpro的活性,凸显了ABPP在抗病毒药物研发中的潜力。
荧光共振能量转移法(fluorescence resonance energy transfer, FRET)是一种非辐射过程,处于激发态的供体荧光团通过偶极-偶极相互作用将能量转移给受体发色团[94]。该方法具有操作简单、分析快速以及灵敏度高等优势,在抑制剂筛选研究中得到广泛运用。研究人员基于Mpro的天然切割位点设计了用7-甲氧基香豆素-4-乙酸(7-methoxycoumarin-4-acetic acid, MCA)和淬灭基团2,4-二硝基苯酚(2,4-dinitropheno, Dnp)进行标记的肽(MCA-substrate)作为Mpro切割的底物,MCA与Dnp通过Mpro的切割位点序列(AVLQ)分隔形成FRET对;当Mpro水解MCA标记的肽底物时,由于FRET效应消失,MCA-AVLQ肽段产生增强的荧光信号[95]。因此,能够抑制Mpro活性的化合物会在FRET分析中表现为相对较低的荧光值(图6)。利用FRET筛选方法,已鉴定出Lead E24和4′-O-methylscutellarein等化合物,这些化合物对Mpro表现出良好抑制活性,并能有效抑制SARS-CoV-2复制[96-97]。Su等[98]证实中药成分通过靶向Mpro表现出SARS-CoV-2抑制活性,从黄芩中分离的生物活性成分黄芩苷和黄芩素已在肝炎和呼吸道疾病治疗中展现出显著抑制Mpro的能力[99]
Lin等[100]建立了一种用于高通量筛选冠状病毒Mpro抑制剂的荧光素酶报告基因筛选(luciferase reporter screening assay)系统。该方法的核心是构建一个整合SARS-CoV Mpro基因、含有切割位点的底物(S)以及荧光素酶(Luc)基因的重组质粒,随后将质粒转染至非洲绿猴肾细胞(Vero)中,并通过G418抗性筛选获得稳定表达的细胞系[83]。由于荧光素酶的N端融合了相对分子质量较大的底物蛋白,通常会抑制荧光素酶活性,导致荧光信号减弱;而当SARS-CoV Mpro高效切割底物蛋白时荧光素酶活性得以释放,荧光信号随之增强。因此,在该筛选体系中具有抑制SARS-CoV Mpro切割活性的化合物会导致较低的荧光值(图7)[83]。通过此筛选策略,证实了nirmatrelvir、GC376和lopinavir抑制SARS-CoV-2 Mpro功能,为新型Mpro抑制剂的发现与开发提供了有力工具[101]
表型筛选法(phenotype screening assay)是一种基于细胞的分析方法,用于评估化合物抑制SARS-CoV-2病毒感染的潜力,旨在发现具有抗病毒活性的先导化合物。该方法的核心是通过观察化合物预处理后对病毒感染细胞的保护程度来评估化合物抗病毒效果,具体操作流程为:在培养基中预先用待筛选化合物处理非洲绿猴肾上皮细胞(Vero E6),随后感染SARS-CoV-2病毒;通过观察和分析细胞病变效应(cytopathic effect, CPE)、空斑减少以及病毒RNA拷贝数变化等关键指标,可有效评估待测化合物对SARS-CoV-2的抗病毒活性(图8)[83]。此方法的优势在于能直接反映化合物对病毒感染细胞的作用效果,从而为化合物抗病毒活性提供直接证据。通过表型筛选法,Riva等[102]鉴定出多种化合物(MDL-28170、ONO-5334、VBY-825及apilimod)表现出显著抗SARS-CoV-2活性并能有效抑制病毒复制。
通过对Mpro底物识别模式的分析,研究已确定P2、P1和P1′三个关键位点的特定氨基酸残基对酶活性起关键决定作用[103-104]。值得注意的是,Mpro以二聚体形式发挥功能,不仅介导复制酶多聚蛋白的成熟,也可切割宿主蛋白以帮助病毒逃逸先天免疫反应[105-106]。这种双重功能在SARS-CoV-2 Mpro中表现尤为突出:它通过切割MAGED2、TRMT1、RNF20和SQSTM1/p62等宿主蛋白,进而促进病毒感染[107-110]。类似地,SADS-CoV Mpro能够切割DCP1A[111],PEDV Mpro则切割gasdermin D[112],这些切割机制均在病毒致病机制中发挥重要作用。尽管Mpro在冠状病毒科中高度保守,但存在其切割宿主蛋白的特异性差异,如何调控病毒的致病性及免疫逃逸能力仍有待阐明。
Mpro抑制IFN-I信号通路的机制较为复杂,且在冠状病毒科内具有保守性[50-52]。Mpro能够靶向通路中的多个关键组分,包括视黄酸诱导基因I (retinoic acid inducible gene I, RIG-I)、MAVS、干扰素基因刺激因子(stimulator of interferon genes, STING)和信号转导和转录激活因子1 (signal transducer and activator of transcription 1, STAT1)[56,113]。值得注意的是,与SARS-CoV相比,SARS-CoV-2 Mpro表现出更强的催化活性和干扰素拮抗能力[52]。此外,SARS-CoV-2 Mpro还通过阻止磷酸化干扰素调节因子3(interferon regulatory factor 3, IRF3)的核转位,进而抑制IFN-I产生[114]。其他冠状病毒如PDCoV、PEDV和FIPV也分别通过切割NEMO或其他关键分子干扰IFN-I信号通路[50-51,53]。然而,为精确解析Mpro与免疫信号组分的相互作用,亟需采用高分辨率结构生物学技术以明确其结合界面并系统阐明蛋白切割的分子机制,这是开发新型抑制剂的关键基础。此类抑制剂通过破坏上述相互作用,从而有效恢复宿主的抗病毒免疫应答。
Mpro抑制剂研发已取得重大进展,已涌现出共价抑制剂和非共价抑制剂等多种类型的抑制剂[59]。近年来报道的Mpro抑制剂以共价抑制剂最为常见,其分子结构中通常含有反应性弹头,可与催化位点的Cys145发生共价结合。然而,高反应性弹头的存在不仅引发对靶向安全性的担忧,还可能降低口服生物利用度[19]。非共价抑制剂则通过可逆结合方式与Mpro催化口袋中的氨基酸残基相互作用。尽管这种结合方式有利于减少潜在副作用和脱靶效应,但由于其与催化口袋的结合相对较弱,常需长期给药或增加剂量,从而可能增加耐药风险[115]。因此,兼具小分子特性和共价抑制剂弹头优势的非共价抑制剂展现出较好的开发前景[116]。然而,将这些抑制剂从实验室推向临床仍面临诸多挑战。在药物递送方面,开发适宜制剂以实现抑制剂向靶细胞或组织的高效递送;在分子设计层面,共价与非共价抑制剂的设计需要系统评估关键特性,包括吸收、分布、代谢、排泄和毒性性质优化、联合治疗策略、可开发性评估及耐药屏障建立[117-119]。此外,潜在的脱靶效应可能导致不良反应和毒性。因此,必须通过动物模型进行体内研究和最终临床试验全面评估这些抑制剂的安全性与有效性。
在筛选方法方面,各技术均存在其优缺点。FRET筛选由于操作简便、灵敏度高而备受青睐,但存在成本高和假阳性风险[120];虚拟筛选法高效经济,但需通过实验验证以排除假阳性;荧光素酶报告基因筛选法可提供化合物活性的详细信息,但成本高昂且流程复杂;ABPP能精确定位共价化合物作用位点,但需对化合物结构进行修饰,增加了实验复杂度;LiP-MS是鉴定蛋白-靶标结合序列的有效工具,但数据解读可能存在困难;表型筛选法可直接评估化合物抗病毒活性,但耗时且成本高。因此,联合运用多种方法可提高抑制剂鉴定的准确性。
除传统策略外,大环化合物、多价配体和蛋白降解靶向嵌合体(proteolysis targeting chimera, PROTAC)等新策略展现出巨大潜力[121-124]。其中,PROTAC技术能精确靶向蛋白降解,对开发抗Mpro病毒药物具有重要意义。传统抑制剂可能由于靶蛋白发生突变产生耐药性,而促进靶蛋白降解的PROTAC技术有望降低耐药风险[125],这为应对冠状病毒快速进化提供了灵活策略。近年来,硒元素因潜在治疗价值受到关注。研究表明在小分子中引入硒原子可增强生物活性[126]。含硒化合物ebselen及其衍生物对SARS-CoV-2 Mpro表现出更好抑制效果[127]。为高效筛选具有潜力的Mpro抑制剂,建议采用联合筛选策略:首先对大规模有机硒化合物库进行虚拟筛选以缩小候选范围,继而通过FRET法进行验证以排除假阳性,最后利用LiP-MS技术解析Mpro与候选药物的作用域及结合位点。该策略可显著缩短筛选时间、降低化合物采购成本,并有效鉴定具有开发前景的新型Mpro抑制剂,从而拓展抗冠状病毒治疗的策略边界。
为应对冠状病毒的持续突变,相关策略不应仅停留于被动应对新变种,而需转向实施前瞻性的预测方法。可以利用计算建模和机器学习算法分析Mpro突变趋势,通过整合不同冠状病毒Mpro的结构与功能数据,预测潜在突变位点和保守区域,从而指导广谱抑制剂的合理设计。此外,开发具有新型作用机制的抑制剂,可为应对耐药病毒变种提供重要的替代治疗策略。
另一方面,宿主因素对Mpro功能及抑制剂效力的影响也不容忽视。宿主遗传多态性可能调节Mpro与抑制剂的相互作用,进而影响治疗反应[19]。宿主免疫状态同样发挥关键作用,激活的免疫系统可能增强抑制剂的抗病毒效果,而免疫抑制状态则可能削弱其疗效[22]。深入理解这些宿主相关因素有助于制定个性化治疗策略,提高抗病毒治疗的整体有效性。
综上所述,尽管本文为理解Mpro及其抑制剂奠定了坚实基础,上述多个方向仍亟需深入探索。通过对这些关键问题的持续研究,不仅可进一步阐明Mpro的生物学机制,也能为开发针对冠状病毒持续进化威胁的有效抗病毒策略提供重要支撑。此类研究既能为创新疗法设计提供理论依据,也有助于为未来病毒大流行的防控构建科学、前瞻的公共卫生策略。
  • 重庆市自然科学基金(CSTB2024NSCQ-MSX0467)
  • 中央高校基本科研业务费专项资金(SWU-KR22036)
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2026年第66卷第3期
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doi: 10.13343/j.cnki.wsxb.20250733
  • 接收时间:2025-09-27
  • 首发时间:2026-03-12
  • 出版时间:2026-03-04
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  • 收稿日期:2025-09-27
  • 录用日期:2025-10-28
基金
Natural Science Foundation of Chongqing(CSTB2024NSCQ-MSX0467)
重庆市自然科学基金(CSTB2024NSCQ-MSX0467)
Fundamental Research Funds for the Central Universities(SWU-KR22036)
中央高校基本科研业务费专项资金(SWU-KR22036)
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    西南大学 动物医学院,重庆

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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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