首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >MLV glycosylated-Gag is an infectivity factor that rescues Nef-deficient HIV-1
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MLV glycosylated-Gag is an infectivity factor that rescues Nef-deficient HIV-1

机译:MLV糖基化的Gag是一种可拯救Nef缺陷型HIV-1的传染因子

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摘要

Optimal infectivity of HIV-1 virions requires synthesis of the HIV-1 regulatory protein Nef in some producer cells but not others. A survey of 18 lymphoid cell lines found that Nef was dispensable in three, each of which harbored gammaretroviruses. Nef-dependent cell lines were rendered Nef-independent by a cell-free supernatant from the independent lines or by transfection of cloned murine leukemia virus (MLV). Analysis of MLV deletion mutations identified glycosylated gag (glycogag) as the factor that rescues Nef-defective HIV-1 virions. Glycogag was also demonstrated to be required for the infectivity of MLV virions produced in lymphoid cells. Direct comparison of Nef and glycogag revealed identical dependence for activity on Env-pseudotype and producer cell type. The two proteins colocalize within cells, and both increase the yield of viral cDNA in target cells. The functional similarity of Nef and glycogag is a compelling example of convergent evolution in which two structurally unrelated proteins provide a function necessary for virion infectivity in lymphoid cells.
机译:HIV-1病毒体的最佳感染力需要在一些生产细胞中合成HIV-1调节蛋白Nef,而在其他生产细胞中则不需要。对18种淋巴样细胞系进行的一项调查发现,Nef可分为三种,每一种都带有γ逆转录病毒。通过来自独立系的无细胞上清液或通过转染克隆的鼠白血病病毒(MLV),使Nef依赖性细胞系成为Nef依赖性的。对MLV缺失突变的分析确定了糖基化的堵嘴糖(glycogagag)是拯救Nef缺陷型HIV-1病毒粒子的因素。还证明了糖蛋白是淋巴样细胞中产生的MLV病毒体的感染性所必需的。 Nef和糖gagg的直接比较表明对Env假型和生产细胞类型的活动具有相同的依赖性。这两种蛋白在细胞内共定位,并且都增加了靶细胞中病毒cDNA的产量。 Nef和糖蛋白的功能相似性是融合进化的一个令人信服的例子,其中两个结构上不相关的蛋白质提供了淋巴样细胞中病毒体感染性所必需的功能。

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  • 作者

    Massimo Pizzato;

  • 作者单位

    Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, 1211 Geneva, Switzerland Department of Infectious Diseases, Division of Medicine, Imperial College London, London W2 1PG, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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