Cited by 88Cancer-related Molecular PathwaysUbiquitin and proteasome pathwaysHeat shock proteins research

Regulation of p53-MDMX interaction by casein kinase 1 alpha

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Chen, Lihong, Li, Changgong, Pan, Yu, Chen, Jiandong·2005·Molecular and Cellular Biology

Abstract

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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Crossref · 10.1128/mcb.25.15.6509-6520.2005

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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
Published
2005-08
Volume
25
Issue
15
Pages
6509-6520
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
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
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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