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.
中科院分区:
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.
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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通讯作者:
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DOI:
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发表时间:
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期刊:
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DOI:
10.1107/s2059798318006551
发表时间:
2018-06-01
期刊:
Acta crystallographica. Section D, Structural biology
影响因子:
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