Murine cytomegalovirus M72 promotes acute virus replication in vivo and is a substrate of the TRiC/CCT complex.

Murine cytomegalovirus M72 promotes acute virus replication in vivo and is a substrate of the TRiC/CCT complex.
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鼠巨细胞病毒M72在体内促进急性病毒复制,并且是Tric/CCT复合物的底物。

DOI:
10.1016/j.virol.2018.07.008
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发表时间:
2018-09
期刊:
影响因子:
3.7
通讯作者:
Upton JW
Upton JW
中科院分区:
医学3区
文献类型:
--
作者:
Gopal S;Perez E Jr;Xia AY;Knowlton JJ;Cerqueira F;Dermody TS;Upton JW

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乙型疱疹病毒dutp酶同源物是核心疱疹病毒蛋白,但对其在感染过程中的作用知之甚少。人巨细胞病毒(HCMV) UL72和鼠巨细胞病毒(MCMV) M72已被指定为dUTPase同源物,先前的研究表明UL72在复制中是不可缺少的,并且酶活性不高。在这里,我们报告了MCMV M72的初步特征。M72不具有dUTPase活性,并且作为具有多种蛋白亚型的泄漏晚期基因产物表达。重要的是,M72增强了MCMV在体外和体内急性感染早期的复制。我们鉴定并确认了M72与真核伴侣蛋白无尾复合体蛋白-1 (TCP-1)环复合体(TRiC)或伴侣蛋白含无尾复合体多肽1 (CCT)的相互作用。越来越多的生化证据表明M72形成同质寡聚物,是TRiC/CCT的底物。综上所述,我们提供了M72在病毒发病机制中的作用的第一个证据,并确定了与TRiC/CCT复合物的一种新的相互作用。
Betaherpesvirus dUTPase homologs are core herpesvirus proteins, but little is known about their role during infection. Human cytomegalovirus (HCMV) UL72 and murine cytomegalovirus (MCMV) M72 have been designated dUTPase homologs, and previous studies indicate UL72 is dispensable for replication and enzymatically inactive. Here, we report the initial characterization of MCMV M72. M72 does not possess dUTPase activity, and is expressed as a leaky-late gene product with multiple protein isoforms. Importantly, M72 augments MCMV replication in vitro and during the early stage of acute infection in vivo. We identify and confirm interaction of M72 with the eukaryotic chaperonin tailless complex protein −1 (TCP-1) ring complex (TRiC) or chaperonin containing tailless complex polypeptide 1 (CCT). Accumulating biochemical evidence indicates M72 forms homo-oligomers and is a substrate of TRiC/CCT. Taken together, we provide the first evidence of M72’s contribution to viral pathogenesis, and identify a novel interaction with the TRiC/CCT complex.
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