Membrane topology of murine coronavirus replicase nonstructural protein 3.

Membrane topology of murine coronavirus replicase nonstructural protein 3.
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DOI:
10.1016/j.virol.2006.12.009
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发表时间:
2007-05-10
期刊:
影响因子:
3.7
通讯作者:
Baker, Susan C.
Baker, Susan C.
中科院分区:
医学3区
文献类型:
--
作者:
Kanjanahaluethai, Amornrat;Chen, Zhongbin;Jukneliene, Dalla;Baker, Susan C.

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小鼠肝炎病毒(MHV)是冠状病毒科的成员。这些正链RNA病毒编码一种复制酶多蛋白,该蛋白被加工成16种非结构蛋白(nsps)。nsps与膜组装以产生双膜囊泡,这是病毒RNA合成的位点。MHV nsp 3含有多个结构域,包括两个木瓜蛋白酶样蛋白酶结构域PLP 1和PLP 2,以及预测的跨膜(TM)结构域。在这项研究中,我们确定了nsp 3-TM的膜拓扑结构,并表明TM介导的PLP 2的束缚对于切割位点3的加工是重要的。生化分析表明,nsp 3是一种整合的膜蛋白,它被插入到内质网(ER)膜上,并在天冬酰胺-2357处糖基化。蛋白酶K消化实验表明nsp 3的TM结构域具有4个跨膜螺旋。我们表明,nsp 3-TM是足够的介导ER膜协会的胞浆蛋白。本研究首次详细分析了冠状病毒nsp 3 TM结构域的拓扑结构和功能。
Mouse hepatitis virus (MHV) is a member of the family Coronaviridae. These positive strand RNA viruses encode a replicase polyprotein that is processed into 16 nonstructural proteins (nsps). The nsps assemble with membranes to generate double membrane vesicles, which are the sites of viral RNA synthesis. MHV nsp3 contains multiple domains including two papain-like protease domains, PLP1 and PLP2, and a predicted transmembrane (TM) domain. In this study, we determined the membrane topology of nsp3-TM and showed that TM-mediated tethering of PLP2 is important for processing at cleavage site 3. Biochemical analysis revealed that nsp3 is an integral membrane protein that is inserted into the endoplasmic reticulum (ER) membranes co-translationally and glycosylated at asparagine-2357. Proteinase K digestion experiments indicate that the TM domain of nsp3 has 4 membrane-spanning helices. We show that nsp3-TM is sufficient in mediating ER membrane association of a cytosolic protein. This study is the first detailed analysis of the topology and function of the coronavirus nsp3 TM domain.
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