Quantitative NMR Study of Insulin-Degrading Enzyme Using Amyloid-β and HIV-1 p6 Elucidates Its Chaperone Activity.
Quantitative NMR Study of Insulin-Degrading Enzyme Using Amyloid-β and HIV-1 p6 Elucidates Its Chaperone Activity.
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DOI:
10.1021/acs.biochem.1c00342
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发表时间:
2021-08-24
期刊:
影响因子:
2.9
通讯作者:
Deshmukh L
中科院分区:
文献类型:
--
作者:
Ramaraju B;Nelson SL;Zheng W;Ghirlando R;Deshmukh L
Insulin degrading enzyme (IDE) hydrolyzes monomeric polypeptides, including amyloid-β (Aβ) and HIV-1 p6. It also acts as a non-proteolytic chaperone to prevent Aβ polymerization. Here we compare interactions of Aβ and nonamyloidogenic p6 with IDE. Although both exhibited similar proteolysis rates, the binding kinetics to an inactive IDE characterized using relaxation-based NMR were remarkably different. IDE and Aβ formed a sparsely populated complex with a lifetime of milliseconds in which a short hydrophobic cleavage segment of Aβ was anchored to IDE. Strikingly, a second and more stable complex was significantly populated with a sub-second lifetime owing to multiple intermolecular contacts between Aβ and IDE. By selectively sequestering Aβ in this non-productive complex, IDE likely increases the critical concentration required for fibrilization. In contrast, IDE and p6 formed a transient, sub-millisecond complex involving a single anchoring p6 motif. Modulation of intermolecular interactions, thus, allows IDE to differentiate between non- and amyloidogenic substrates.
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