Cited by 141Alzheimer's disease research and treatmentsProtein Kinase Regulation and GTPase SignalingDementia and Cognitive Impairment Research

Glycogen Synthase Kinase 3β Phosphorylates Alzheimer's Disease-Specific Ser396 of Microtubule-Associated Protein Tau by a Sequential Mechanism

Li, Tong, Paudel, Hemant K.·2006·Biochemistry

Abstract

Phosphorylation of tau on S(396) was suggested to be a key step in the development of neurofibrillary pathology in Alzheimer's disease brain [Bramblett, G. T., Goedert, M., Jacks, R., Merrick, S. E., Trojanowski, J. Q., and Lee, V. M.-Y. (1993) Neuron 10, 1089-1099]. GSK3beta phosphorylates Ser(396) of tau in the brain by a mechanism which is not clear. In this study, when HEK-293 cells were cotransfected with tau and GSK3beta, GSK3beta co-immunoprecipitated with tau and phosphorylated tau on S(202), T(231), S(396), and S(400) but not on S(262), S(235), and S(404). Blocking phosphorylation on T(231), S(235), S(396), S(400), or S(404) did not prevent the subsequent phosphorylation on S(202) by GSK3beta. These data suggest that GSK3beta directly phosphorylates tau on S(202) (without requiring prephosphorylation). However, preventing phosphorylation on S(235), S(400), and S(404) prevented GSK3beta-dependent phosphorylation of T(231), S(396), and S(400), respectively. This indicates that phosphorylation of T(231), S(396), and S(400) by GSK3beta depends on a previous phosphorylation of S(235), S(400), and S(404), respectively. To examine S(396) phosphorylation, we analyzed phosphorylation of S(396), S(400), and S(404). Blocking phosphorylation of S(404) prevented the subsequent GSK3beta-dependent phosphorylation of both S(400) and S(396). When phosphorylation of S(404) was allowed but S(400) blocked, GSK3beta failed to phosphorylate S(396). Thus, GSK3beta phosphorylates S(396) by a two-step mechanism. In the first step, GSK3beta phosphorylates S(400) of previously S(404)-phosphorylated tau. This event primes tau for second-step phosphorylation of S(396) by GSK3beta. We conclude that GSK3beta phosphorylates tau directly at S(202) but requires the previous phosphorylation on S(235) to phosphorylate T(231). Phosphorylation of S(396), on the other hand, occurs sequentially. Once a priming kinase phosphorylates S(404), GSK3beta sequentially phosphorylates S(400) and then S(396).

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Crossref · 10.1021/bi051634r

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Authors
Li, T., & Paudel, H. K.
Affiliations
Jewish General Hospital (CA)
Corresponding author
Paudel, Hemant K.
Venue
Biochemistry
Published
2006-02-14
Volume
45
Issue
10
Pages
3125-3133
ISSN
  • 0006-2960 (ISSN-L)
  • 1520-4995
OpenAlex
W2094263795
Cited by
140
References
14
Citations by year
2026: 7 · 2025: 6 · 2024: 6 · 2023: 11 · 2022: 7 · 2021: 10 · 2020: 7 · 2019: 10 · 2018: 8 · 2017: 4 · 2016: 8 · 2015: 4 · 2014: 9 · 2013: 5 · 2012: 5
FWCI
3.99
Type
journal article
Language
en
Open access
closed
Locations
  • Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
glycogen synthase kinase-3β, tau protein, tau phosphorylation, sequential phosphorylation, Alzheimer's disease, neurofibrillary tangles, tau isoforms
MeSH terms
Glycogen Synthase Kinase 3 beta, Alanine, Alzheimer Disease, Animals, Brain, Cattle, Cells, Cultured, Humans, Mutation, Phosphorylation, Serine, Transfection, Tyrosine, tau Proteins, Glycogen Synthase Kinase 3

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