Dr Tessa Young tessa.r.young@durham.ac.uk
Assistant Professor
The Human Amyloid Precursor Protein Binds Copper Ions Dominated by a Picomolar Affinity Site in the Helix-Rich E2 Domain
Young, Tessa R.; Pukala, Tara L.; Cappai, Roberto; Wedd, Anthony G.; Xiao, Zhiguang
Authors
Tara L. Pukala
Roberto Cappai
Anthony G. Wedd
Zhiguang Xiao
Abstract
A manifestation of Alzheimer’s disease (AD) is the aggregation in the brain of amyloid β (Aβ) peptides derived from the amyloid precursor protein (APP). APP has been linked to modulation of normal copper homeostasis, while dysregulation of Aβ production and clearance has been associated with disruption of copper balance. However, quantitative copper chemistry on APP is lacking, in contrast to the plethora of copper chemistry available for Aβ peptides. The soluble extracellular protein domain sAPPα (molar mass including post-translational modifications of ∼100 kDa) has now been isolated in good yield and high quality. It is known to feature several copper binding sites with different affinities. However, under Cu-limiting conditions, it binds either Cu(I) or Cu(II) with picomolar affinity at a single site (labeled M1) that is located within the APP E2 subdomain. M1 in E2 was identified previously by X-ray crystallography as a Cu(II) site that features four histidine side chains (H313, H386, H432, and H436) as ligands. The presence of CuII(His)4 is confirmed in solution at pH ≤7.4, while Cu(I) binding involves either the same ligands or a subset. The binding affinities are pH-dependent, and the picomolar affinities for both Cu(I) and Cu(II) at pH 7.4 indicate that either oxidation state may be accessible under physiological conditions. Redox activity was observed in the presence of an electron donor (ascorbate) and acceptor (dioxygen). A critical analysis of the potential biological implications of these findings is presented.
Citation
Young, T. R., Pukala, T. L., Cappai, R., Wedd, A. G., & Xiao, Z. (2018). The Human Amyloid Precursor Protein Binds Copper Ions Dominated by a Picomolar Affinity Site in the Helix-Rich E2 Domain. Biochemistry, 57(28), 4165-4176. https://doi.org/10.1021/acs.biochem.8b00572
Journal Article Type | Article |
---|---|
Acceptance Date | May 21, 2018 |
Online Publication Date | Jun 12, 2018 |
Publication Date | Jul 17, 2018 |
Deposit Date | Jun 21, 2018 |
Publicly Available Date | Mar 28, 2024 |
Journal | Biochemistry. |
Print ISSN | 0006-2960 |
Electronic ISSN | 1520-4995 |
Publisher | American Chemical Society |
Peer Reviewed | Peer Reviewed |
Volume | 57 |
Issue | 28 |
Pages | 4165-4176 |
DOI | https://doi.org/10.1021/acs.biochem.8b00572 |
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Copyright Statement
Supplementary Information This document is the Accepted Manuscript version of a Published Work that appeared in final form in Biochemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.biochem.8b00572.
Accepted Journal Article
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