Copper mediated amyloid-β binding to Transthyretin.
Copper mediated amyloid-β binding to Transthyretin.
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DOI:
10.1038/s41598-018-31808-5
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发表时间:
2018-09-13
影响因子:
4.6
通讯作者:
Shepard W
中科院分区:
文献类型:
--
作者:
Ciccone L;Fruchart-Gaillard C;Mourier G;Savko M;Nencetti S;Orlandini E;Servent D;Stura EA;Shepard W
Transthyretin (TTR), a homotetrameric protein that transports thyroxine and retinol both in plasma and in cerebrospinal (CSF) fluid provides a natural protective response against Alzheimer’s disease (AD), modulates amyloid-β (Aβ) deposition by direct interaction and co-localizes with Aβ in plaques. TTR levels are lower in the CSF of AD patients. Zn2+, Mn2+ and Fe2+ transform TTR into a protease able to cleave Aβ. To explain these activities, monomer dissociation or conformational changes have been suggested. Here, we report that when TTR crystals are exposed to copper or iron salts, the tetramer undergoes a significant conformational change that alters the dimer-dimer interface and rearranges residues implicated in TTR’s ability to neutralize Aβ. We also describe the conformational changes in TTR upon the binding of the various metal ions. Furthermore, using bio-layer interferometry (BLI) with immobilized Aβ(1–28), we observe the binding of TTR only in the presence of copper. Such Cu2+-dependent binding suggests a recognition mechanism whereby Cu2+ modulates both the TTR conformation, induces a complementary Aβ structure and may participate in the interaction. Cu2+-soaked TTR crystals show a conformation different from that induced by Fe2+, and intriguingly, TTR crystals grown in presence of Aβ(1–28) show different positions for the copper sites from those grown its absence.
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影响因子:
3.7
作者:
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通讯作者:
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DOI:
10.1107/s090744491104491x
发表时间:
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通讯作者:
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DOI:
10.1107/s0907444906023481
发表时间:
2006-08-01
影响因子:
2.2
作者:
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通讯作者:
Dauter, Zbigniew