Cited by 315Alzheimer's disease research and treatmentsUbiquitin and proteasome pathwaysParkinson's Disease Mechanisms and Treatments

Sequestosome 1/p62 shuttles polyubiquitinated tau for proteasomal degradation

Babu, Jeganathan Ramesh, Geetha, Thangiah, Wooten, Marie W.·2005·Journal of Neurochemistry

Abstract

Inclusions isolated from several neurodegenerative diseases, including Alzheimer's disease (AD), are characterized by ubiquitin‐positive proteinaceous aggregates. Employing confocal and immunoelectron microscopy, we find that the ubiquitin‐associating protein sequestosome1/p62, co‐localizes to aggregates isolated from AD but not control brain, along with the E3 ubiquitin ligase, TRAF6. This interaction could be recapitulated by co‐transfection in HEK293 cells. Employing both in vitro and in vivo approaches, tau was found to be a substrate of the TRAF6, possessing lysine 63 polyubiquitin chains. Moreover, tau recovered from brain of TRAF6 knockout mice, compared with wild type, was not ubiquitinated. Tau degradation took place through the ubiquitin–proteasome pathway and was dependent upon either the K63‐polyubiquitin chains or upon p62. In brain lysates of p62 knockout mice, tau fails to co‐interact with Rpt1, a proteasomal subunit, thereby indicating a requirement for p62 shuttling of tau to the proteasome. Our results demonstrate that p62 interacts with K63‐polyubiquitinated tau through its UBA domain and serves a novel role in regulating tau proteasomal degradation. We propose a model whereby either a decline in p62 expression or a decrease in proteasome activity may contribute to accumulation of insoluble/aggregated K63‐polyubiquitinated tau.

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Crossref · 10.1111/j.1471-4159.2005.03181.x

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Authors
Babu, J. R., Geetha, T., & Wooten, M. W.
Affiliations
Auburn University (US)
Venue
Journal of Neurochemistry
Publisher
Wiley
Published
2005-06-10
Volume
94
Issue
1
Pages
192-203
ISSN
  • 0022-3042 (ISSN-L)
  • 1471-4159
OpenAlex
W2091829752
Cited by
315
References
43
Citations by year
2026: 6 · 2025: 12 · 2024: 19 · 2023: 10 · 2022: 25 · 2021: 20 · 2020: 19 · 2019: 13 · 2018: 15 · 2017: 15 · 2016: 17 · 2015: 9 · 2014: 24 · 2013: 10 · 2012: 23
FWCI
6.99
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurochemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Alabama at Birmingham
  • National Institute of Neurological Disorders and Stroke (R01NS033661, NS-33661)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
Keywords
tau protein, K63-linked ubiquitination, TRAF6, ubiquitin-proteasome system, proteasomal degradation, Alzheimer's disease, protein aggregates, UBA domain, neurodegeneration
MeSH terms
Sequestosome-1 Protein, Aged, Animals, Cell Line, Female, Genetic Vectors, Humans, Male, Proteins, PC12 Cells, tau Proteins, Polyubiquitin, Proteasome Endopeptidase Complex, Adaptor Proteins, Signal Transducing, Rats

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