Cited by 60Alzheimer's disease research and treatmentsElectrochemical sensors and biosensorsElectrochemical Analysis and Applications

Probing copper/tau protein interactions electrochemically

Martic, Sanela, Rains, Meghan K., Kraatz, Heinz-Bernhard·2013·Analytical Biochemistry

Abstract

Alzheimer's disease (AD) is a neurodegenerative disorder that is characterized by peptide and protein misfolding and aggregation, in part due to the presence of excess metal ions such as copper(II) [Cu(II)]. Recently, the brain levels of Cu(II) complexes in vivo were linked to the oxidative stress in neurodegenerative disorders, including AD. Amyloid β-peptide (Aβ), found outside neuronal cells, has been investigated extensively in connection with Cu(II) ion toxicity; however, the effects of metallation on tau are less known. Normal tau protein binds and stabilizes the microtubules in neurons, but in diseased cells tau hyperphosphorylation and aggregation are evident and compromise tau function. There is increasing evidence that the Cu(II) ion may play an important role in tau biochemistry. Here, we present an electrochemical study of the interactions between full-length tau-410 and Cu(II) ions. The coordination of Cu(II) ions to tau immobilized on gold surfaces induces an electrochemical signal at approximately 140±5mV versus Ag/AgCl due to the Cu(II)/Cu(I) redox couple. Redox potentials and current intensities of Cu(II)-containing nonphosphorylated tau (nTau) and phosphorylated tau (pTau) films were determined at different pH conditions. Greater Cu(II) uptake by pTau over nTau films was observed at low pH. Competitive zinc(II) [Zn(II)] ion binding studies revealed significant Cu(II) ion displacement in pTau films. X-ray photoelectron spectroscopy analysis indicated the presence of Cu 2p and Zn 2p binding energies in protein samples, further supporting metal ion coordination to protein films. The surface-based electrochemical technique requires a minimal protein amount (a few microliters) and allows monitoring the bound Cu(II) ions and the redox activities of the resulting metalloprotein films.

Integrity signals

Registry

Crossref · 10.1016/j.ab.2013.07.015

Cites

54 of 54 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

This paper’s full text isn’t openly available, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Martic, S., Rains, M. K., & Kraatz, H.-B.
Affiliations
University of Toronto (CA)
Corresponding author
Kraatz, Heinz-Bernhard
Venue
Analytical Biochemistry
Publisher
Elsevier BV
Published
2013-11
Volume
442
Issue
2
Pages
130-137
ISSN
0003-2697 (ISSN-L)
OpenAlex
W2018966182
Cited by
60
References
54
Citations by year
2026: 1 · 2025: 7 · 2024: 3 · 2023: 7 · 2022: 3 · 2021: 6 · 2020: 5 · 2019: 9 · 2018: 3 · 2017: 2 · 2016: 5 · 2015: 3 · 2014: 5 · 2013: 1
FWCI
3.24
Type
journal article
Language
en
Open access
closed
Locations
  • Analytical Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
University of Toronto Scarborough
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrochemical sensors and biosensors
  • Physical Sciences › Chemistry › Electrochemistry › Electrochemical Analysis and Applications
Keywords
copper(II) binding, tau protein, Alzheimer's disease, tau phosphorylation, Cu(II)/Cu(I) redox couple, electrochemical detection, metal coordination
MeSH terms
Binding, Competitive, Copper, Electrochemistry, Humans, Oxidation-Reduction, Phosphoproteins, Phosphorylation, Protein Binding, tau Proteins

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review