在h-BRCA1中发现的罕见粉原蛋白变体Ser282Leu和Gln356Arg的结构影响
Neha Mishra1,2, Suchita Dubey1,2, Anchala Kumari1
1Advanced Center for Treatment, Research and Education in Cancer, Navi Mumbai, India.
Proteins
|December 1, 2023
概括
两个BRCA1变体Ser282Leu和Gln356Arg表现出改变的蛋白质结构,促进聚合和粉样蛋白形成. 这种结构基础有助于对不确定的BRCA1变异进行分类,并了解它们在疾病发病过程中的作用.
科学领域:
- 生物化学 生化学
- 结构生物学 结构生物学
- 遗传学 是一个遗传学.
背景情况:
- BRCA1 (170-1600) 中部区域本质上是无序的,但却有许多临床上显著的变异.
- 了解这些变异的结构影响对于准确的病原性评估至关重要.
研究的目的:
- 为了结构性地描述人类的BRCA1 (h-BRCA1) 260-553区域.
- 评估Ser282Leu和Gln356Arg误解变体的病原性结构基础.
主要方法:
- 微角X射线散射 (SAXS) 用于分析蛋白质结构和乱.
- 使用2,2,2-三乙醇 (TFE) 进行循环二重化 (CD) 光谱,以研究从混乱到秩序的转变.
- 热转移测试用于评估蛋白质-DNA复合物的稳定性.
- 传输电子显微镜 (TEM) 和提奥夫拉T (ThT) 光检测粉样蛋白形成.
- 对形状波动的计算分析.
主要成果:
- WT h-BRCA1 ((260-553) 部分失序,而Ser282Leu显示出增加的失序和Gln356Arg聚合物.
- 与WT相比,在TFE的存在下,这两种变体都表现出改变了从混乱到秩序的过渡.
- 蛋白质Ser282Leu和Gln356Arg形成了粉样纤维,与WT蛋白不同.
- 计算分析揭示了变体中更大的形状灵活性.
结论:
- BRCA1变异Ser282Leu和Gln356Arg诱导显著的结构变化,包括聚合和氨基基基因.
- 这些结构变化为BRCA1.1中不确定意义的变异的分类提供了机制框架.
- 鉴定amyloidogenic变体可能是了解它们在疾病发病过程中的作用的关键.
关键词:
2,2,2-三乙醇 (TFE) 是一种二,二,三乙醇.乳腺癌易感性基因1 (BRCA1) 的发生.遗传性乳腺癌 (HBC) 是一种本质上有障碍的蛋白质 (IDP)未知临床意义的变异 (VUS)更多相关视频
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