Cited by 228Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchPrion Diseases and Protein Misfolding

Pyroglutamate Formation Influences Solubility and Amyloidogenicity of Amyloid Peptides

Schlenzig, Dagmar, Manhart, Susanne, Cinar, Yeliz, Kleinschmidt, Martin, Hause, Gerd, Willbold, Dieter, Funke, Susanne Aileen, Schilling, Stephan +1 more·2009·Biochemistry

Abstract

N-Terminally truncated and pyroglutamate (pGlu) modified amyloid beta (Abeta) peptides are major constituents of amyloid deposits in sporadic and inherited Alzheimer's disease (AD). Formation of pGlu at the N-terminus confers resistance against cleavage by most aminopeptidases, increases toxicity of the peptides, and may seed Abeta aggregate formation. Similarly, the deposited amyloid peptides ABri and ADan, which cause a very similar histopathology in familial British dementia (FBD) and familial Danish dementia (FDD), are N-terminally blocked by pGlu. Triggered by the coincidence of pGlu-modified amyloid peptides and similar pathology in AD, FBD, and FDD, we investigated the impact of N-terminal pGlu on biochemical and biophysical properties of Abeta, ABri, and ADan. N-Terminal pGlu increases the hydrophobicity and changes the pH-dependent solubility profile, rendering the pGlu-modified peptides less soluble in the basic pH range. The pGlu residue increases the aggregation propensity of all amyloid peptides as evidenced by ThT fluorescence assays and dynamic light scattering. The far-UV CD spectroscopic analysis points toward an enhanced beta-sheet structure of the pGlu-Abeta. Importantly, changes in fibril morphology are clearly caused by the N-terminal pGlu, resulting in the formation of short fibers, which are frequently arranged in bundles. The effect of pGlu on the morphology is virtually indistinguishable between ABri, ADan, and Abeta. The data provide evidence for a comparable influence of the pGlu modification on the aggregation process of structurally different amyloid peptides, thus likely contributing to the molecularly distinct neurodegenerative diseases AD, FBD, and FDD. The main driving force for the aggregation is apparently an increase in the hydrophobicity and thus an accelerated seed formation.

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Crossref · 10.1021/bi900818a

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Authors
Schlenzig, D., Manhart, S., Cinar, Y., Kleinschmidt, M., Hause, G., Willbold, D., Funke, S. A., Schilling, S., & Demuth, H.-U.
Affiliations
  • Probiodrug (Germany) (DE)
  • Forschungszentrum Jülich (DE)
  • Martin Luther University Halle-Wittenberg (DE)
Corresponding author
Schilling, Stephan
Venue
Biochemistry
Published
2009-07-01
Volume
48
Issue
29
Pages
7072-7078
ISSN
  • 0006-2960 (ISSN-L)
  • 1520-4995
OpenAlex
W2095253097
Cited by
228
References
32
Citations by year
2026: 10 · 2025: 12 · 2024: 11 · 2023: 12 · 2022: 7 · 2021: 14 · 2020: 24 · 2019: 17 · 2018: 9 · 2017: 15 · 2016: 13 · 2015: 18 · 2014: 20 · 2013: 13 · 2012: 20
FWCI
7.29
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Prion Diseases and Protein Misfolding
Keywords
amyloid-beta, amyloid peptides, ABRI, Adán, Alzheimer's disease, familial British dementia, familial Danish dementia, N-terminal truncation, peptide solubility, pH-dependent solubility, hydrophobicity, amyloid fibril formation, beta-sheet, fibril morphology, seed development
MeSH terms
Alzheimer Disease, Amino Acid Sequence, Amyloid, Circular Dichroism, Humans, Hydrogen-Ion Concentration, Microscopy, Electron, Molecular Sequence Data, Peptides, Pyrrolidonecarboxylic Acid, Solubility, Spectrophotometry, Ultraviolet

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