Structural alterations within native amyloidogenic immunoglobulin light chains.

Structural alterations within native amyloidogenic immunoglobulin light chains.
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DOI:
10.1016/j.jmb.2009.04.010
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发表时间:
2009-05-29
影响因子:
5.6
通讯作者:
Ramirez-Alvarado, Marina
Ramirez-Alvarado, Marina
中科院分区:
生物学2区
文献类型:
--
作者:
Randles, Edward G.;Thompson, James R.;Martin, Douglas J.;Ramirez-Alvarado, Marina

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淀粉样变性疾病的特征是前体蛋白的错误折叠导致淀粉样原纤维的形成。尽管存在不同的前驱物质,但错误折叠机制中存在一些共性。在轻链淀粉样变性(AL)中,免疫球蛋白轻链(LC)形成沉积在重要器官细胞外空间的淀粉样纤维。与非淀粉样蛋白相比,A1蛋白在热力学上是不稳定的,一些研究将这种不稳定与增加的纤维形成率联系在一起。在这里,我们介绍了两个高度同源的AL蛋白,AL-12和AL-103的晶体结构。这种结构研究表明,这些蛋白质保留了典型的生殖系二聚体界面。我们强调了在二聚体界面两侧的两个环中的重要结构变化,并将这些结果与AL-12和AL-103中存在的体细胞突变相关联。我们认为,这些改变是信息性的结构特征,可能导致蛋白质不稳定,从而导致参与淀粉样蛋白形成的初始事件的构象变化。
Amyloid diseases are characterized by the misfolding of a precursor protein that leads to amyloid fibril formation. Despite the fact that there are different precursors, some commonalities in the misfolding mechanism are thought to exist. In light chain amyloidosis (AL), the immunoglobulin light chain (LC) forms amyloid fibrils that deposit in the extracellular space of vital organs. AL proteins are thermodynamically destabilized compared to non-amyloidogenic proteins and some studies have linked this instability to increased fibril formation rates. Here we present the crystal structures of two highly homologous AL proteins, AL-12 and AL-103. This structural study shows that these proteins retain the canonical germline dimer interface. We highlight important structural alterations in two loops flanking the dimer interface and correlate these results with the somatic mutations present in AL-12 and AL-103. We suggest that these alterations are informative structural features that are likely contributing to protein instability that leads to conformational changes involved in the initial events of amyloid formation.
DOI: 10.1371/journal.pone.0005169
发表时间: 2009
期刊: PloS one
影响因子: 3.7
作者:
Poshusta TL;Sikkink LA;Leung N;Clark RJ;Dispenzieri A;Ramirez-Alvarado M
通讯作者: Ramirez-Alvarado M
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期刊: BIOCHEMISTRY
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