Protein Kinase CK1δ Phosphorylates Key Sites in the Acidic Domain of Murine Double-Minute Clone 2 Protein (MDM2) That Regulate p53 Turnover
Abstract
Murine double-minute clone 2 protein (MDM2) is an E3 ubiquitin ligase that regulates the turnover of several cellular factors including the p53 tumor suppressor protein. As part of the mechanism of p53 induction in response to DNA damage, a cluster of serine residues within the central acidic domain of MDM2 become hypophosphorylated, leading to attenuation of MDM2-mediated p53 destruction. In the present study, we identify the protein kinase CK1delta as a major cellular activity that phosphorylates MDM2. Amino acid substitution, coupled with phosphopeptide analyses, indicates that several serine residues in the acidic domain, including Ser-240, Ser-242, and Ser-246, as well as Ser-383 in the C-terminal region, are phosphorylated by CK1delta in vitro. We also show, through expression of a dominant negative mutant of CK1delta or treatment of cells with IC261, a CK1delta-selective inhibitor, that MDM2 is phosphorylated by CK1delta in cultured cells. These data establish the identity of a key signaling molecule that promotes the phosphorylation of a major regulatory region in MDM2 under normal growth conditions.
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CK1-δ phosphorylation of the Mdm2 acidic domain blocks Mdm2-dependent p53 degradation.
“For example, CK1-δ phosphorylation of the Mdm2 acidic domain blocks Mdm2-dependent p53 degradation [65].”
From The p53 orchestra: Mdm2 and Mdmx set the tone (2010) · cites this paper as [65]
Akt phosphorylates Mdmx at Ser367, and both DNA damage and Akt-induced Ser367 phosphorylation stimulate binding of Mdmx to 14-3-3 proteins.
“Interestingly, one of the damage kinase target residues (Ser367) of Mdmx is also phosphorylated by Akt [65]. Furthermore, DNA damage and Akt-induced Ser367 phosphorylation both stimulate binding of Mdmx to 14-3-3 proteins [57,64].”
From The p53 orchestra: Mdm2 and Mdmx set the tone (2010) · cites this paper as [65]
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- Authors
- Winter, M., Milne, D., Dias, S., Kulikov, R., Knippschild, U., Blattner, C., & Meek, D.
- Affiliations
- University of Dundee (GB)
- Corresponding author
- Meek, David
- Venue
- Biochemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2004-11-24
- Volume
- 43
- Issue
- 51
- Pages
- 16356-16364
- ISSN
- 0006-2960 (ISSN-L)
- 1520-4995
- OpenAlex
- W2026937239
- Cited by
- 60
- References
- 26
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 1 · 2023: 1 · 2022: 4 · 2020: 3 · 2019: 1 · 2018: 1 · 2017: 2 · 2016: 3 · 2015: 2 · 2014: 4 · 2013: 7 · 2012: 5
- FWCI
- 1.60
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Biochemistry (publishedVersion)
- PubMed (publishedVersion)
- Discovery Research Portal (University of Dundee) (submittedVersion)
- 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
- MDM2, CK1δ, MDM2 phosphorylation, acidic domain, serine phosphorylation, E3 ubiquitin ligase, p53 degradation, dominant-negative mutant, DNA damage response
- MeSH terms
- Amino Acid Sequence, Animals, Chlorocebus aethiops, HeLa Cells, Humans, Molecular Sequence Data, Nuclear Proteins, Phosphorylation, Proto-Oncogene Proteins, Serine, Tumor Suppressor Protein p53, Protein Structure, Tertiary, COS Cells, Casein Kinase Idelta, Proto-Oncogene Proteins c-mdm2
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