Diversity, developmental regulation and distribution of murine PR55/B subunits of protein phosphatase 2A
Abstract
Protein phosphatase (PP2A) 2A is a hetero-trimeric holoenzyme that consists of a core dimer composed of a catalytic subunit that is tightly complexed with the scaffolding subunit PR65/A. This core dimer associates with variable regulatory subunits of the PR55/B, PR61/B', PR72/B" and PR93/PR110/B"' families. As PP2A holoenzymes containing PR55/B have been shown to be involved in the pathogenesis of Alzheimer's disease, we characterized the PR55/B family with particular emphasis on its distribution and expression in the brain. We determined the genomic organization of all members of the PR55/B family and cloned their murine cDNAs. Thereby, two novel splice variants of PR55/Bbeta were identified. In addition, Northern blot analysis revealed multiple transcripts for the different PR55 subunits, suggesting a higher variability within the PR55 family. In situ hybridization analysis revealed that all PR55/B subunits were widely expressed in the brain. PR55/Balpha and Bbeta protein expression varies significantly in areas of the brain affected by neurodegenerative diseases such as the hippocampus or cerebellum. At the cellular level, PR55/Bbeta protein expression was confined to neurons, whereas PR55/Balpha was also expressed in activated astrocytes indicating that the PR55 isoforms confer a different function to the holoenzyme complex. As PP2A dysfunction has been demonstrated to contribute to various human diseases, dissecting the PP2A holoenzyme and its particular function in different cell types will assist in the development of novel therapeutic strategies.
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B55γ is nearly exclusively expressed in brain and B′′α is highly expressed in heart, consistent with previous reports.
“This is probably best illustrated for B55γ (nearly exclusively expressed in brain) and B″α (highly expressed in heart), in accordance with previously published work of others [20][21][22].”
From Physiologic functions of PP2A: Lessons from genetically modified mice (2019) · cites this paper as [20]
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- Authors
- Schmidt, K., Kins, S., Schild, A., Nitsch, R. M., Hemmings, B. A., & Götz, J.
- Affiliations
- Friedrich Miescher Institute (CH)
- University of Zurich (CH)
- Corresponding author
- Götz, Jürgen
- Venue
- European Journal of Neuroscience
- Publisher
- Wiley
- Published
- 2002-12
- Volume
- 16
- Issue
- 11
- Pages
- 2039-2048
- ISSN
- 0953-816X (ISSN-L)
- 1460-9568
- OpenAlex
- W2048159541
- Cited by
- 54
- References
- 41
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 1 · 2021: 2 · 2020: 1 · 2018: 4 · 2016: 2 · 2015: 2 · 2013: 3 · 2012: 4
- FWCI
- 1.16
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- European Journal of Neuroscience (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Keywords
- protein phosphatase 2A, PP2A holoenzyme, splice variants, brain expression, hippocampus, cerebellum, neurons, astrocytes, Alzheimer's disease, neurodegenerative diseases, gene expression regulation
- MeSH terms
- Animals, Astrocytes, Brain, Immunohistochemistry, Molecular Sequence Data, Neurons, Phosphoprotein Phosphatases, RNA, Messenger, Sequence Homology, Nucleic Acid, Gene Expression Regulation, Enzymologic, tau Proteins, Sequence Homology, Amino Acid, Alternative Splicing, DNA, Complementary, COS Cells, Neurodegenerative Diseases, Protein Isoforms, Holoenzymes, Macromolecular Substances, Mice, Protein Phosphatase 2
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