Protein phosphatase 2A is targeted to cell division control protein 6 by a calcium-binding regulatory subunit
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The cell division control protein 6 (Cdc6) is essential for formation of pre-replication complexes at origins of DNA replication. Phosphorylation of Cdc6 by cyclin-dependent kinases inhibits ubiquitination of Cdc6 by APC/C(cdh1) and degradation by the proteasome. Experiments described here show that the PR70 member of the PPP2R3 family of regulatory subunits targets protein phosphatase 2A (PP2A) to Cdc6. Interaction with Cdc6 is mediated by residues within the C terminus of PR70, whereas interaction with PP2A requires N-terminal sequences conserved within the PPP2R3 family. Two functional EF-hand calcium-binding motifs mediate a calcium-enhanced interaction of PR70 with PP2A. Calcium has no effect on the interaction of PR70 with Cdc6 but enhances the association of PP2A with Cdc6 through its effects on PR70. Knockdown of PR70 by RNA interference results in an accumulation of endogenous and expressed Cdc6 protein that is dependent on the cyclin-dependent protein kinase phosphorylation sites on Cdc6. Knockdown of PR70 also causes G(1) arrest, suggesting that PR70 function is critical for progression into S phase. These observations indicate that PP2A can be targeted in a calcium-regulated manner to Cdc6 via the PR70 subunit, where it plays a role in regulating protein phosphorylation and stability.
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The C-terminus of B′′ subunits binds the catalytic subunit and is thought to serve as a substrate-binding site, with CDC6 binding there.
“The C-terminus of B” subunits mediates binding to the catalytic subunit and is also thought to act as a substrate binding site, as known interactors including CDC6 have been shown to bind here (Davis et al., 2008; Wlodarchak et al., 2013).”
From PP2A holoenzymes, substrate specificity driving cellular functions and deregulation in cancer (2019) · cites this paper as Davis et al., 2008
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- Authors
- Davis, A. J., Yan, Z., Martinez, B., & Mumby, M. C.
- Affiliations
- The University of Texas Southwestern Medical Center (US)
- Duke University (US)
- Corresponding author
- Mumby, Marc C.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2008-06
- Volume
- 283
- Issue
- 23
- Pages
- 16104-16114
- ISSN
- 0021-9258 (ISSN-L)
- PMC
- PMC2414307
- OpenAlex
- W2040038307
- Cited by
- 45
- References
- 40
- Citations by year
- 2025: 1 · 2024: 3 · 2023: 1 · 2022: 5 · 2021: 3 · 2020: 3 · 2019: 3 · 2018: 2 · 2017: 1 · 2016: 3 · 2015: 2 · 2014: 6 · 2013: 4 · 2012: 3
- FWCI
- 0.68
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of General Medical Sciences (T32GM007062, GM49505, R01GM049505, T32GM07062)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Tyrosine Phosphatases
- Keywords
- protein phosphatase 2A, CDC6, protein-protein interaction, cyclin-dependent kinase phosphorylation, proteasomal degradation, pre-replication complex, origin of replication, G1 cell cycle arrest, S phase progression, protein stability
- MeSH terms
- Animals, Calcium, Chlorocebus aethiops, DNA Replication, HeLa Cells, Humans, Nuclear Proteins, Phosphorylation, Antigens, CD, Cadherins, G1 Phase, S Phase, Replication Origin, Cell Cycle Proteins, COS Cells, Amino Acid Motifs, Protein Subunits, Proteasome Endopeptidase Complex, Protein Phosphatase 2, Ubiquitination
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