Myelin basic protein binds to and inhibits the fibrillar assembly of Abeta42 in vitro.

Myelin basic protein binds to and inhibits the fibrillar assembly of Abeta42 in vitro.
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DOI:
10.1021/bi900037s
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发表时间:
2009-06-09
期刊:
影响因子:
2.9
通讯作者:
Van Nostrand, William E.
Van Nostrand, William E.
中科院分区:
生物学3区
文献类型:
--
作者:
Hoos, Michael D.;Ahmed, Mahiuddin;Smith, Steven O.;Van Nostrand, William E.

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β-淀粉样蛋白 (Aβ) 原纤维沉积在脑实质内的斑块中并沿着脑血管沉积,这是阿尔茨海默病的一个标志。 Aβ 肽是通过 β 和 γ 分泌酶连续裂解 Aβ 前体蛋白而产生的,产生长度为 39 至 43 个氨基酸的肽。其中最常见的是 Aβ40 和 Aβ42,其中第一个含量最丰富。 Aβ42 比 Aβ40 更容易形成纤维,并且与早期 Aβ 斑块沉积有关。我们之前的研究确定髓磷脂碱性蛋白 (MBP) 能够抑制高度原纤维化 Aβ 肽的原纤维形成,该肽含有与家族性脑淀粉样血管病相关的 E22Q(荷兰)和 D23N(爱荷华)突变 [Hoos 等,2017]。 2007 年生物学杂志。化学。 282:9952–9961]。在本研究中,我们通过生化和超微结构技术的结合证明,MBP 还能够抑制正常 Aβ42 肽的 β-片层纤维组装。这些发现表明,MBP 可能在调节 Aβ42 的沉积中发挥作用,从而也可能调节阿尔茨海默病中淀粉样蛋白斑的早期形成。
The deposition of amyloid β-protein (Aβ) fibrils into plaques within the brain parenchyma and along cerebral blood vessels is a hallmark of Alzheimer’s disease. Aβ peptides are produced through the successive cleavage of the Aβ precursor protein by β and γ-secretase, producing peptides of between 39 and 43 amino acids in length. The most common of these are Aβ40 and Aβ42, the first of which being the most abundant. Aβ42 is more fibrillogenic than Aβ40 and has been implicated in early Aβ plaque deposition. Our previous studies determined that myelin basic protein (MBP) was capable of inhibiting fibril formation of a highly fibrillogenic Aβ peptide containing both E22Q (Dutch) and D23N (Iowa) mutations associated with familial forms of cerebral amyloid angiopathy [Hoos et al. 2007 J. Biol. Chem. 282:9952–9961]. In the present study we show through a combination of biochemical and ultrastructural techniques that MBP is also capable of inhibiting the β-sheet fibrillar assembly of the normal Aβ42 peptide. These findings suggest that MBP may play a role in regulating the deposition of Aβ42 and thereby also may regulate the early formation of amyloid plaques in Alzheimer’s disease.
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发表时间: 1992-06-01
期刊: NATURE GENETICS
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