Structural, biochemical, and in vivo characterization of the first virally encoded cyclophilin from the Mimivirus.

Structural, biochemical, and in vivo characterization of the first virally encoded cyclophilin from the Mimivirus.
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DOI:
10.1016/j.jmb.2007.08.051
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发表时间:
2008-04-18
影响因子:
5.6
通讯作者:
Eisenmosser, Elan Z.
Eisenmosser, Elan Z.
中科院分区:
生物学2区
文献类型:
--
作者:
Thai, Vu;Renesto, Patricia;Fowler, C. Andrew;Browni, Darin J.;Davis, Tara;Gu, Wanjun;Pollock, David D.;Kern, Dorothee;Raoult, Didier;Eisenmosser, Elan Z.

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虽然多种病毒利用宿主细胞亲环素,包括严重急性呼吸道综合征(SARS)和人类免疫缺陷病毒1型(HIV-1),它们在感染中的作用知之甚少。为了帮助阐明这些作用,我们已经表征了第一个病毒编码的亲环素(mimicyp),其来源于迄今为止发现的最大病毒(Mimivirus),也是人类肺炎的病原体。Mimicyp采用典型的亲环素折叠,但它也形成三聚体不同于任何先前表征的同源物。引人注目的是,免疫荧光测定显示,mimicyp定位于成熟病毒粒子的表面,如最近提出的几种病毒,招募宿主细胞亲环蛋白,如SARS和HIV-1。此外,与人亲环素相比,mimicyp缺乏肽基脯氨酰异构酶活性。因此,这项研究表明,无论是从宿主细胞(即HIV-1和SARS)招募还是病毒编码(即模仿病毒),亲环蛋白都定位在至少一部分病毒的病毒表面。
Although multiple viruses utilize host cell cyclophilins, including severe acute respiratory syndrome (SARS) and human immunodeficiency virus type-1(HIV-1), their role in infection is poorly understood. To help elucidate these roles, we have characterized the first virally encoded cyclophilin (mimicyp) derived from the largest virus discovered to date (the Mimivirus) that is also a causative agent of pneumonia in humans. Mimicyp adopts a typical cyclophilin-fold, yet it also forms trimers unlike any previously characterized homologue. Strikingly, immunofluorescence assays reveal that mimicyp localizes to the surface of the mature virion, as recently proposed for several viruses that recruit host cell cyclophilins such as SARS and HIV-1. Additionally mimicyp lacks peptidyl-prolyl isomerase activity in contrast to human cyclophilins. Thus, this study suggests that cyclophilins, whether recruited from host cells (i.e. HIV-1 and SARS) or virally encoded (i.e. Mimivirus), are localized on viral surfaces for at least a subset of viruses.
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