來自中科院微生物研究所的研究人員發(fā)表了題為“Structure of measles virus hemagglutinin bound to its epithelial receptor nectin-4”的文章,,揭示了麻疹病毒血凝素(hemagglutinin)與上皮細(xì)胞受體nectin-4的復(fù)合體結(jié)構(gòu),,解析了這兩者之間在結(jié)構(gòu)水平上的相互作用模式。相關(guān)成果發(fā)布在12月2日的《自然結(jié)構(gòu)與分子生物學(xué)》(Nature Structural & Molecular Biology)雜志上,。
文章的通訊作者是國內(nèi)流感病毒研究知名學(xué)者高福研究員,,高福研究員主要研究方向?yàn)椴≡⑸锟绶N間傳播機(jī)制與結(jié)構(gòu)免疫學(xué),尤其是有關(guān)T細(xì)胞識(shí)別,、艾滋病病毒等囊膜病毒侵入的分子機(jī)制,、禽流感等動(dòng)物源性病原跨種間傳遞的機(jī)制的研究。在Nature, Science, Lancet雜志上均發(fā)表過文章,,入選“百人計(jì)劃”,,“國家杰出青年基金”,“國家973項(xiàng)目”首席科學(xué)家,。
麻疹是常見于兒童的急性呼吸道傳染病,。盡管相關(guān)疫苗早已問世,全球目前每年仍有約12萬人死于麻疹,。麻疹的傳染性很強(qiáng),,未接種疫苗者如與麻疹患者接觸,其患病幾率可超過90%,,因此仍是當(dāng)前全世界的一個(gè)重大公共衛(wèi)生問題,。
細(xì)胞受體是病毒入侵易感細(xì)胞和啟動(dòng)感染的關(guān)鍵。到目前為止已經(jīng)鑒別出了3種麻疹病毒細(xì)胞受體——膜輔蛋白CD46,、信號(hào)淋巴細(xì)胞激活因子SLAM和粘附分子Nectin-4,。前兩種受體與麻疹病毒血凝素(MV-H)形成復(fù)合體的結(jié)構(gòu)已經(jīng)獲得報(bào)道。Nectin-4近期是上皮細(xì)胞中鑒別的一種受體,,可接觸麻疹病毒并幫助其穿過上皮細(xì)胞,,在麻疹病毒進(jìn)出人體呼吸道時(shí)起關(guān)鍵作用。但目前研究人員對(duì)于它與MV-H的結(jié)合模式仍不清楚,。
在這項(xiàng)研究中,,研究人員解析了人類nectin-4細(xì)胞膜遠(yuǎn)端結(jié)構(gòu)域與MV-H形成的復(fù)合體的結(jié)構(gòu)。分析結(jié)果表明nectin-4通過N末端IgV結(jié)構(gòu)域獨(dú)特地結(jié)合了MV-H β4-β5槽,;這一接觸界面由疏水性相互作用支配,。研究人員發(fā)現(xiàn)MV-H的nectin-4結(jié)合位點(diǎn)與其他兩種受體的結(jié)合位點(diǎn)存在廣泛重疊。
新研究表明位于MV-H β4-β5槽中心的疏水口袋與結(jié)合所有三種鑒別的麻疹病毒受體有關(guān),,代表了抗病毒藥物一個(gè)有潛力的靶點(diǎn),。(生物谷Bioon.com)
doi:10.1038/nsmb.2432
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Structure of measles virus hemagglutinin bound to its epithelial receptor nectin-4
Xiaoai Zhang,1, 6 Guangwen Lu,1, 6 Jianxun Qi,1 Yan Li,1 Yan He,2 Xiang Xu,3 Jia Shi,2 Catherine W-H Zhang,2 Jinghua Yan1 & George F Gao1, 4, 5
Measles virus is a major public health concern worldwide. Three measles virus cell receptors have been identified so far, and the structures of the first two in complex with measles virus hemagglutinin (MV-H) have been reported. Nectin-4 is the most recently identified receptor in epithelial cells, and its binding mode to MV-H remains elusive. In this study, we solved the structure of the membrane-distal domain of human nectin-4 in complex with MV-H. The structure shows that nectin-4 binds the MV-H β4-β5 groove exclusively via its N-terminal IgV domain; the contact interface is dominated by hydrophobic interactions. The binding site in MV-H for nectin-4 also overlaps extensively with those of the other two receptors. Finally, a hydrophobic pocket centered in the β4-β5 groove is involved in binding to all three identified measles virus receptors, representing a potential target for antiviral drugs.