Targeted disruption of the PME-1 gene causes loss of demethylated PP2A and perinatal lethality in mice
Open accessAbstract
BACKGROUND: Phosphoprotein phosphatase 2A (PP2A), a major serine-threonine protein phosphatase in eukaryotes, is an oligomeric protein comprised of structural (A) and catalytic (C) subunits to which a variable regulatory subunit (B) can associate. The C subunit contains a methyl ester post-translational modification on its C-terminal leucine residue, which is removed by a specific methylesterase (PME-1). Methylesterification is thought to control the binding of different B subunits to AC dimers, but little is known about its physiological significance in vivo. METHODOLOGY/PRINCIPAL FINDINGS: Here, we show that targeted disruption of the PME-1 gene causes perinatal lethality in mice, a phenotype that correlates with a virtually complete loss of the demethylated form of PP2A in the nervous system and peripheral tissues. Interestingly, PP2A catalytic activity over a peptide substrate was dramatically reduced in PME-1(-/-) tissues, which also displayed alterations in phosphoproteome content. CONCLUSIONS: These findings suggest a role for the demethylated form of PP2A in maintenance of enzyme function and phosphorylation networks in vivo.
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Constitutive Lcmt1 knockout is embryonically lethal, and constitutive Ppme1 knockout is perinatally lethal at P1 due to inability to start normal breathing or suckling.
“constitutive KO of Lcmt1 was embryonically lethal, and constitutive KO of Ppme1 resulted in perinatal lethality, with all mice dying at P1 due to lack of ability to start normal breathing or suckling [39,56].”
From Physiologic functions of PP2A: Lessons from genetically modified mice (2019) · cites this paper as [56]
Neonatal Ppme1 knockout mice show breathing and suckling difficulties.
“Normal embryonic development, but perinatal death at P1; neonatal [56] | mice showed breathing and suckling difficulties”
From Physiologic functions of PP2A: Lessons from genetically modified mice (2019) · cites this paper as [56]
In Ppme1 knockout mice, embryonic development is normal, but perinatal death occurs at P1.
“Normal embryonic development, but perinatal death at P1; neonatal [56] | mice showed breathing and suckling difficulties”
From Physiologic functions of PP2A: Lessons from genetically modified mice (2019) · cites this paper as [56]
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- Authors
- Ortega-Gutiérrez, S., Leung, D., Ficarro, S., Peters, E. C., & Cravatt, B. F.
- Affiliations
- Scripps Research Institute (US)
- Genomics Institute of the Novartis Research Foundation (US)
- Corresponding author
- Cravatt, Benjamin F.
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2008-07-02
- Volume
- 3
- Issue
- 7
- Pages
- e2486
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC2438471
- OpenAlex
- W2011159058
- Cited by
- 50
- References
- 56
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 3 · 2019: 3 · 2018: 4 · 2017: 3 · 2016: 1 · 2015: 4 · 2014: 5 · 2013: 2 · 2012: 9
- FWCI
- 1.24
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Figshare (submittedVersion, cc-by)
- Funders
- National Institutes of Health (DA015197)
- National Institute on Drug Abuse (DA015197, R01DA015197)
- 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
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cancer-related gene regulation
- Keywords
- PME-1, protein phosphatase 2A, gene knockout, perinatal lethality, phosphoproteome, protein phosphorylation, nervous system
- MeSH terms
- Animals, Carboxylic Ester Hydrolases, Genes, Lethal, Methylation, Mice, Transgenic, Models, Genetic, Gene Targeting, Catalytic Domain, Mice, Protein Phosphatase 2
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