Cryo-EM structures of hIAPP fibrils seeded by patient-extracted fibrils reveal new polymorphs and conserved fibril cores.

Cryo-EM structures of hIAPP fibrils seeded by patient-extracted fibrils reveal new polymorphs and conserved fibril cores.
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DOI:
10.1038/s41594-021-00646-x
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发表时间:
2021-09
影响因子:
16.8
通讯作者:
Eisenberg, David S.
Eisenberg, David S.
中科院分区:
生物学1区
文献类型:
--
作者:
Cao, Qin;Boyer, David R.;Sawaya, Michael R.;Abskharon, Romany;Saelices, Lorena;Nguyen, Binh A.;Lu, Jiahui;Murray, Kevin A.;Kandeel, Fouad;Eisenberg, David S.

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人胰岛淀粉样多肽的淀粉样变性(hIAPP)是II型糖尿病(T2 D)的病理标志,II型糖尿病是一种困扰世界近10%人口的流行病。为了使疾病相关的hIAPP原纤维可视化,我们从T2 D供体的胰岛细胞中提取淀粉样蛋白原纤维,并通过接种合成的hIAPP来扩增它们的量。Cryo-EM研究揭示了四种原纤维多态性原子结构。它们与四个未接种的hIAPP原纤维的相似性从几乎相同(TW 3)到不存在(TW 2)不等。hIAPP多态性的多样性库似乎产生于三个不同的原丝核心以不同的组合被包围。TW 1、TW 2和TW 4的结构特征表明它们可能是致病种子的忠实复制。如果是这样的话,这里确定的结构提供了T2 D期间形成的hIAPP淀粉样纤维的最直接的视图。
Amyloidosis of human islet amyloid polypeptide (hIAPP) is a pathological hallmark of type II diabetes (T2D), an epidemic afflicting nearly 10% of the world’s population. To visualize disease-relevant hIAPP fibrils, we extracted amyloid fibrils from islet cells of a T2D donor and amplified their quantity by seeding synthetic hIAPP. Cryo-EM studies revealed four fibril polymorphic atomic structures. Their resemblance to four unseeded hIAPP fibrils varies from nearly identical (TW3) to non-existent (TW2). The diverse repertoire of hIAPP polymorphs appears to arise from three distinct protofilament cores entwined in different combinations. The structural distinctiveness of TW1, TW2, and TW4 suggests they may be faithful replications of the pathogenic seeds. If so, the structures determined here provide the most direct view yet of hIAPP amyloid fibrils formed during T2D.
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