Structural domains of endogenous murine leukemia virus gp70s containing specific antigenic determinants defined by monoclonal antibodies.

Structural domains of endogenous murine leukemia virus gp70s containing specific antigenic determinants defined by monoclonal antibodies.
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内源性鼠白血病病毒 gp70 的结构域,含有单克隆抗体定义的特异性抗原决定簇。

DOI:
10.1016/0042-6822(82)90143-x
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发表时间:
1982
期刊:
影响因子:
3.7
通讯作者:
Hämmerling,U
Hämmerling,U
中科院分区:
医学3区
文献类型:
--
作者:
Pinter,A;Honnen,WJ;Tung,JS;O'Donnell,PV;Hämmerling,U

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使用一系列鼠和大鼠单克隆抗体在内源性嗜亲性鼠白血病病毒(MuLV)gp 70上鉴定出8个不同的抗原决定簇或表位(标记为a-h)。这些表位的特征在于它们在克隆MuLV的面板中的分布模式,以及它们在由纯化的gp 70的自发分解或由溶解的病毒体中的gp 70的受控蛋白水解产生的gp 70片段中的定位。形成含有表位B、c和f的主要32 K羧基末端片段。该片段还具有p15(E)二硫键位点,并含有大约4个复杂的(1型)碳水化合物链。氨基末端35 K片段含有表位a、d、g和h,并具有两个糖基化位点,包括偶尔保留糖苷内切酶H敏感性寡糖链的位点。还获得了一个相关的49 K片段,它包括整个35 K区,并含有一个带有表位e的附加序列。在一系列研究的双嗜性MCF型病毒中,只有那些位于32 K片段中的表位被保留下来,这表明对于这些重组病毒,该结构域的至少一部分来自亲嗜性亲本。一个模型,表明这些片段的可能方向和它们的结构特征。
Eight distinct antigenic determinants, or epitopes (labeled a-h) were identified on endogenous ecotropic murine leukemia virus (MuLV) gp70s using a series of murine and rat monoclonal antibodies. These epitopes were characterized by their distribution patterns in a panel of cloned MuLVs, and by their localization in fragments of gp70 generated either by spontaneous breakdown of purified gp70, or by controlled proteolysis of gp70 in solubilized virions. A major 32K carboxy terminal fragment was formed which contained epitopes b, c, and f. This fragment also possessed the p15(E) disulfide linkage site, and contained approximately four complex (type 1) carbohydrate chains. An amino terminal 35K fragment contained epitopes a, d, g, and h, and possessed two glycosylated sites, including a site which occasionally retained an endoglycosidase H-sensitive oligosaccharide chain. A related 49K fragment was also obtained which included the entire 35K region and contained an additional sequence bearing epitope e. In a series of dual-tropic MCF-type viruses studied, only those epitopes located in the 32K fragment were ever retained, indicating that for these recombinant viruses at least a portion of that domain was derived from the ecotropic parent. A model is presented indicating the likely orientation of these fragments and their structural characteristics.
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