Regulation of p53-MDMX interaction by casein kinase 1 alpha
Open accessAbstract
MDMX is a homolog of MDM2 that is critical for regulating p53 function during mouse development. MDMX degradation is regulated by MDM2-mediated ubiquitination. Whether there are other mechanisms of MDMX regulation is largely unknown. We found that MDMX binds to the casein kinase 1 alpha isoform (CK1alpha) and is phosphorylated by CK1alpha. Expression of CK1alpha stimulates the ability of MDMX to bind to p53 and inhibit p53 transcriptional function. Regulation of MDMX-p53 interaction requires CK1alpha binding to the central region of MDMX and phosphorylation of MDMX on serine 289. Inhibition of CK1alpha expression by isoform-specific small interfering RNA (siRNA) activates p53 and further enhances p53 activity after ionizing irradiation. CK1alpha siRNA also cooperates with DNA damage to induce apoptosis. These results suggest that CK1alpha is a functionally relevant MDMX-binding protein and plays an important role in regulating p53 activity in the absence or presence of stress.
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CK1-α increases the interaction between Mdmx and p53, which should inactivate p53.
“By contrast, CK1-α increases the interaction between Mdmx and p53, which should inactivate p53 [67].”
From The p53 orchestra: Mdm2 and Mdmx set the tone (2010) · cites this paper as [67]
CK1 alpha did not target S342 and S367 in vitro.
“The casein kinase 1 alpha isoform that binds and phosphorylates MDMX in the central region in such reactions (Chen et al, 2005) did not target S342 and S367 (Figure 8A).”
From ATM and Chk2-dependent phosphorylation of MDMX contribute to p53 activation after DNA damage (2005) · cites this paper as Chen et al, 2005
14-3-3 copurifies with MDMX.
“We have recently found that 14-3-3 copurifies with MDMX (Chen et al, 2005).”
From ATM and Chk2-dependent phosphorylation of MDMX contribute to p53 activation after DNA damage (2005) · cites this paper as Chen et al, 2005
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- Authors
- Chen, L., Li, C., Pan, Y., & Chen, J.
- Affiliations
- Moffitt Cancer Center (US)
- Corresponding author
- Chen, Jiandong
- Venue
- Molecular and Cellular Biology
- Publisher
- Informa UK Limited
- Published
- 2005-08
- Volume
- 25
- Issue
- 15
- Pages
- 6509-6520
- ISSN
- 0270-7306 (ISSN-L)
- 1098-5549
- PMC
- PMC1190343
- OpenAlex
- W2135451553
- Cited by
- 88
- References
- 47
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 5 · 2023: 4 · 2022: 3 · 2021: 3 · 2020: 5 · 2019: 4 · 2018: 4 · 2017: 3 · 2016: 9 · 2015: 5 · 2014: 5 · 2013: 2 · 2012: 4
- FWCI
- 2.03
- Type
- journal article
- Language
- en
- Open access
- green
- europepmc.org
- Locations
- Molecular and Cellular Biology (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- American Cancer Society
- National Institutes of Health
- Topics
- Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
- Keywords
- p53, MDMX, CK1α, protein phosphorylation, p53 transcriptional activity, ionizing radiation, DNA damage, apoptosis, mouse development
- MeSH terms
- Animals, Binding Sites, Carrier Proteins, HeLa Cells, Humans, Nuclear Proteins, Phosphorylation, Proto-Oncogene Proteins, Serine, Tumor Suppressor Protein p53, RNA Interference, Casein Kinase Ialpha, Mice, Proto-Oncogene Proteins c-mdm2
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