An engineered four-stranded coiled coil substitutes for the tetramerization domain of wild-type p53 and alleviates transdominant inhibition by tumor-derived p53 mutants.

An engineered four-stranded coiled coil substitutes for the tetramerization domain of wild-type p53 and alleviates transdominant inhibition by tumor-derived p53 mutants.
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工程化的四链卷曲线圈取代了野生型 p53 的四聚化结构域,并减轻了肿瘤来源的 p53 突变体的反显性抑制。

DOI:
10.1007/978-1-4899-1100-1_3
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发表时间:
1996
期刊:
影响因子:
11.2
通讯作者:
T. Halazonetis
T. Halazonetis
中科院分区:
医学1区
文献类型:
--
作者:
M. Waterman;J. L. Waterman;T. Halazonetis

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P53的四聚结构域是有效的肿瘤抑制活性所必需的。然而,这个结构域也允许野生型p53与显性的肿瘤来源的阴性突变体异寡聚。我们探索了用工程化的亮氨酸拉链取代野生型p53的天然四聚结构域的可行性,该拉链组装成一个四股卷曲的线圈。该工程拉链在体外驱动P53的四聚,在体内驱动P53的功能。此外,它还减轻了肿瘤来源的P53突变体的跨显性抑制作用,这意味着显性负性突变体通过与野生型P53的异源寡聚起作用。工程拉链驱动四聚化的能力对p53的功能至关重要,因为P53二聚体是通过用天然亮氨酸拉链取代P53四聚结构域而形成的,是弱的肿瘤抑制因子。
The tetramerization domain of p53 is required for efficient tumor suppressor activity. This domain, however, also allows wild-type p53 to heterooligomerize with dominant negative tumor-derived p53 mutants. We explored the feasibility of substituting the native tetramerization domain of wild-type p53 with an engineered leucine zipper that assembles as a four-stranded coiled coil. The engineered zipper drove p53 tetramerization in vitro and p53 function in vivo. Furthermore, it alleviated transdominant inhibition by tumor-derived p53 mutants, implying that dominant negative mutants act by hetero-oligomerizing with wild-type p53. The ability of the engineered zipper to drive tetramerization was critical for p53 function, since p53 dimers, formed by substituting the p53 tetramerization domain with a native leucine zipper, were weak tumor suppressors.
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发表时间: 1994-03-15
影响因子: 11.1
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