αB-Crystallin Chaperone Inhibits Aβ Aggregation by Capping the β-Sheet-Rich Oligomers and Fibrils.

αB-Crystallin Chaperone Inhibits Aβ Aggregation by Capping the β-Sheet-Rich Oligomers and Fibrils.
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αB-晶体蛋白伴侣通过封端富含 β-片的低聚物和原纤维来抑制 Aβ 聚集

DOI:
10.1021/acs.jpcb.0c07256
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发表时间:
2020-11-12
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
Ding F
Ding F
中科院分区:
其他
文献类型:
--
作者:
Sun Y;Ding F

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内源性蛋白抑制淀粉样蛋白聚集的细胞毒性是治疗退行性淀粉样蛋白疾病的一种很有前景的策略,因为它具有高的生物相容性和低的免疫原性。在这项研究中,我们用离散分子动力学模拟方法研究了αB-晶状体蛋白结构核心区(αBC)对Aβ纤化的抑制机制。我们的计算结果概括了实验观察到的Aβ在αBC中的结合部位,并表明αBC在聚集过程中可以通过覆盖暴露的β-Sheet延长表面与各种Aβ聚集体结合-包括单体、二聚体和可能的其他高分子量低聚物、原纤维和纤维。因此,可以抑制A-β低聚物成核成原纤维和原纤维生长。从我们的系统计算研究中获得的机械性见解可能有助于开发新的治疗策略,以调节退行性疾病中病理性淀粉样蛋白的聚集。
Inhibiting the cytotoxicity of amyloid aggregation by endogenous proteins is a promising strategy against degenerative amyloid diseases due to their intrinsically high biocompatibility and low immunogenicity. In this study, we investigated the inhibition mechanism of the structured core region of αB-crystallin (αBC) against Aβ fibrillization using discrete molecular dynamics simulations. Our computational results recapitulated the experimentally observed Aβ binding sites in αBC and suggested that αBC could bind to various Aβ aggregate species during the aggregation process – including monomers, dimers, and likely other high molecular weight oligomers, proto-fibrils and fibrils – by capping the exposed β-sheet elongation surfaces. Thus, the nucleation of Aβ oligomers into fibrils and the fibril growth could be inhibited. Mechanistic insights obtained from our systematic computational studies may aid in the development of novel therapeutic strategies to modulate the aggregation of pathological, amyloidogenic protein in degenerative diseases.
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