Enhanced proteolytic processing of the human immunodeficiency virus type 1 envelope protein in murine Ltk(-) cells.

Enhanced proteolytic processing of the human immunodeficiency virus type 1 envelope protein in murine Ltk(-) cells.
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鼠 Ltk(-) 细胞中人类免疫缺陷病毒 1 型包膜蛋白的增强蛋白水解加工。

DOI:
10.1089/aid.1995.11.81
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发表时间:
1995
期刊:
AIDS research and human retroviruses.
影响因子:
--
通讯作者:
Esteban,M
Esteban,M
中科院分区:
--
文献类型:
--
作者:
Rodriguez,D;Rodriguez,JR;Esteban,M

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人类免疫缺陷病毒1型(HIV-1)包膜(Env)前体糖蛋白(gp 160)的蛋白水解加工,以产生成熟的gp 120和gp 41蛋白是病毒感染和病毒诱导的细胞融合所必需的。也有人提出,gp 120在免疫显性V3环区的裂解是病毒与细胞和细胞与细胞融合所必需的。在这项调查中,我们研究了HIV-1 Env的蛋白水解加工的各种来源的细胞(人,猴和小鼠)感染的牛痘病毒重组表达整个gp 160蛋白(VV-env-1)。我们已经观察到,在鼠Ltk(-)细胞中,除了gp 160在gp 120/gp 41位点处的蛋白水解切割之外,还存在gp 160在V3环和位于gp 41的C末端的新位点处的广泛的细胞内蛋白水解加工。在用凝血酶处理VV-env-1感染的猴细胞提取物后,观察到Env前体的类似蛋白水解加工,凝血酶是一种胰蛋白酶样蛋白酶,已显示在V3环处切割gp 120。我们的研究结果表明,小鼠Ltk(-)细胞可能是一个很好的模型系统的Env与不同的HIV分离株的结构研究,并在寻找蛋白酶抑制剂,可以防止HIV-1感染的易感细胞通过阻断Env的蛋白水解。
Proteolytic processing of the human immunodeficiency virus type 1 (HIV-1) envelope (Env) precursor glycoprotein (gp 160) to produce the mature gp120 and gp41 proteins is required for virus infection and virus-induced cell fusion. It has also been suggested that cleavage of gp120 at the immunodominant V3 loop region is required for virus-to-cell and cell-to-cell fusion. In this investigation we have studied the proteolytic processing of the HIV-1 Env in cells of various origins (human, monkey, and mouse) infected with a vaccinia virus recombinant expressing the entire gp160 protein (VV-env-1). We have observed that in murine Ltk(-) cells, in addition to the proteolytic cleavage of gp160 at the gp 120/gp41 site, there is also extensive intracellular proteolytic processing of gp160 at the V3 loop and at a novel site located at the C terminus of gp41. Similar proteolytic processing of the Env precursor was observed after treatment of extracts of VV-env-1-infected monkey cells with thrombin, a trypsin-like protease that has been shown to cleave the gp120 at the V3 loop. Our findings suggest that murine Ltk(-) cells could be a good model system for structural studies of Env with different HIV isolates and in searches for proteinase inhibitors that could prevent HIV-1 infection of susceptible cells by blocking proteolysis of Env.
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