Secondary structure of Huntingtin amino-terminal region.

Secondary structure of Huntingtin amino-terminal region.
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DOI:
10.1016/j.str.2009.08.002
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发表时间:
2009-09-09
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Bezprozvanny I
Bezprozvanny I
中科院分区:
其他
文献类型:
--
作者:
Kim MW;Chelliah Y;Kim SW;Otwinowski Z;Bezprozvanny I

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亨廷顿病(HD)是一种遗传性神经退行性疾病,由亨廷顿蛋白(Htt)第一外显子内的多聚谷氨酰胺(PolyQ)扩增(>36Q)引起。在这里,我们应用X射线结晶学来确定Htt-17Q的第一个外显子(EX1)的二级结构。Htt17Q-EX1的结构由一个氨基末端的α-螺旋、一个多聚17Q区和一个由富含脯氨酸的区域形成的多聚脯氨酸螺旋组成。Poly17Q区在结构上采用多种构象,包括α-螺旋、无规卷曲和扩展环。Poly17Q区的构象受到邻近蛋白质区构象的影响,表明了天然蛋白质背景的重要性。我们认为,在我们的结构中观察到的多Q区域的构象灵活性是许多淀粉样蛋白的共同特征。我们进一步提出,Htt蛋白中致病的PolyQ-Expansion增加了随机卷曲的长度,从而促进了聚集,并促进了与细胞中其他蛋白质的异常相互作用。
Huntington's disease (HD) is a genetic neurodegenerative disorder resulting from polyglutamine (polyQ) expansion (> 36Q) within first exon of Huntingtin (Htt) protein. Here we applied X-ray crystallography to determine the secondary structure of the first exon (EX1) of Htt-17Q. The structure of Htt17Q-EX1 consists of an amino-terminal α-helix, a poly17Q region, and a polyproline helix formed by the proline-rich region. The poly17Q region adopts multiple conformations in the structure, including α-helix, random coil and extended loop. The conformation of the poly17Q region is influenced by the conformation of neighbouring protein regions, demonstrating importance of the native protein context. We propose that the conformational flexibility of the polyQ region observed in our structure is a common characteristic of many amyloidogenic proteins. We further propose that the pathogenic polyQ-expansion in the Htt protein increases the length of the random coil, which promotes aggregation and facilitates abnormal interactions with other proteins in cells.
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