Cited by 63Alzheimer's disease research and treatmentsRNA Research and SplicingAmyotrophic Lateral Sclerosis Research

Aggregation Properties of the Small Nuclear Ribonucleoprotein U1-70K in Alzheimer Disease

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Diner, Ian, Hales, Chadwick M., Bishof, Isaac, Rabenold, Lake, Duong, Duc M., Yi, Hong, Laur, Oskar, Gearing, Marla +5 more·2014·Journal of Biological Chemistry

Abstract

Recent evidence indicates that U1-70K and other U1 small nuclear ribonucleoproteins are Sarkosyl-insoluble and associate with Tau neurofibrillary tangles selectively in Alzheimer disease (AD). Currently, the mechanisms underlying the conversion of soluble nuclear U1 small nuclear ribonucleoproteins into insoluble cytoplasmic aggregates remain elusive. Based on the biochemical and subcellular distribution properties of U1-70K in AD, we hypothesized that aggregated U1-70K itself or other biopolymers (e.g. proteins or nucleic acids) interact with and sequester natively folded soluble U1-70K into insoluble aggregates. Here, we demonstrate that total homogenates from AD brain induce soluble U1-70K from control brain or recombinant U1-70K to become Sarkosyl-insoluble. This effect was not dependent on RNA and did not correlate with detergent-insoluble Tau levels as AD homogenates with reduced levels of these components were still capable of inducing U1-70K aggregation. In contrast, proteinase K-treated AD homogenates and Sarkosyl-soluble AD fractions were unable to induce U1-70K aggregation, indicating that aggregated proteins in AD brain are responsible for inducing soluble U1-70K aggregation. It was determined that the C terminus of U1-70K, which harbors two disordered low complexity (LC) domains, is necessary for U1-70K aggregation. Moreover, both LC1 and LC2 domains were sufficient for aggregation. Finally, protein cross-linking and mass spectrometry studies demonstrated that a U1-70K fragment harboring the LC1 domain directly interacts with aggregated U1-70K in AD brain. Our results support a hypothesis that aberrant forms of U1-70K in AD can directly sequester soluble forms of U1-70K into insoluble aggregates.

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Crossref · 10.1074/jbc.m114.562959

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  • U1 small nuclear ribonucleoproteins and other RNA-binding proteins are associated with tau tangles in the AD brain detergent-insoluble proteome.

    “previous analyses of the AD brain detergent-insoluble proteome, which have repeatedly demonstrated the association of U1 small nuclear ribonucleoproteins (U1 snRNPs) and other RNA-binding proteins with tau tangles [133–137].”

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Authors
Diner, I., Hales, C. M., Bishof, I., Rabenold, L., Duong, D. M., Yi, H., Laur, O., Gearing, M., Troncoso, J., Thambisetty, M., Lah, J. J., Levey, A. I., & Seyfried, N. T.
Affiliations
  • Emory University (US)
  • Johns Hopkins University (US)
  • National Institutes of Health (US)
Corresponding author
Seyfried, Nicholas T.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2014-12
Volume
289
Issue
51
Pages
35296-35313
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2090228228
Cited by
63
References
49
Citations by year
2026: 3 · 2025: 10 · 2024: 10 · 2023: 6 · 2022: 5 · 2021: 6 · 2020: 8 · 2019: 3 · 2018: 5 · 2017: 3 · 2016: 4
FWCI
1.56
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (5T32GM008367, P50AG025688, P30NS055077)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
Keywords
U1-70K, Alzheimer's disease, protein aggregation, neurofibrillary tangles, low-complexity domains, C-terminal domain, protein-protein interaction, protein cross-linking, protein sequestration, brain homogenate
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Autopsy, Brain, Female, Humans, Male, Middle Aged, Peptide Fragments, Protein Conformation, Recombinant Proteins, Sarcosine, Solubility, Mass Spectrometry, Blotting, Western, Microscopy, Immunoelectron, Ribonucleoprotein, U1 Small Nuclear, Protein Structure, Tertiary, HEK293 Cells

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