Proteolytic Cleavage of the mdm2 Oncoprotein during Apoptosis
Open accessAbstract
The mdm2 oncogene encodes a 90-kDa protein that can bind to the p53 tumor suppressor protein and negatively regulate its functions in transcription, cell cycle arrest, and apoptosis. The mdm2 gene is frequently amplified in human sarcomas, which may be responsible for the malignant transformations. We present evidence that the mdm2 oncoprotein is cleaved by an interleukin 1beta-converting enzyme-like protease (caspase) during p53-mediated apoptosis. The protease that cleaves mdm2 has a specificity similar to that of CPP32 (caspase-3), and recombinant caspase-3 is able to cleave mdm2 in vitro. The protease cleavage site has been mapped to between residue 361 and 362 of human mdm2. The proteolytic cleavage removes the COOH-terminal RING finger domain of mdm2, resulting in the loss of RNA binding activity. The p53 binding and inhibition functions of mdm2 are not affected by the cleavage. The cleavage site sequence of mdm2 is evolutionarily conserved, suggesting that regulation by caspase cleavage during apoptosis is an important feature of mdm2.
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Caspase 3 cuts MDM2 at one site, residue 361, releasing a C-terminal fragment (362-491) that contains the phosphorylation sites and the RING domain.
“Caspase 3 cleaves MDM2 at a single site (361) and releases the C-terminal fragment 362-491 containing the phosphorylation sites and RING domain.”
From ATM activates p53 by regulating MDM2 oligomerization and E3 processivity (2009) · cites this paper as Chen et al, 1997
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- Authors
- Chen, L., Marechal, V., Moreau, J., Levine, A. J., & Chen, J.
- Affiliations
- Louisiana State University (US)
- Institut Jacques Monod (FR)
- Princeton University (US)
- Corresponding author
- Chen, Jiandong
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1997-09
- Volume
- 272
- Issue
- 36
- Pages
- 22966-22973
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2021237189
- Cited by
- 121
- References
- 64
- Citations by year
- 2023: 2 · 2021: 1 · 2020: 1 · 2019: 6 · 2017: 1 · 2016: 3 · 2014: 4 · 2013: 2 · 2012: 3
- FWCI
- 6.39
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Funders
- Ladies Leukemia League
- National Institutes of Health (5r01ca072915-05)
- National Cancer Institute (CA72915-01)
- Topics
- Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
- Keywords
- MDM2, p53, caspase-3, proteolytic cleavage, apoptosis, RING domain, cleavage site, sarcoma, tumor suppressor regulation, RNA-binding activity
- MeSH terms
- Amidohydrolases, Amino Acid Sequence, Base Sequence, Cysteine Endopeptidases, Enzyme Activation, HeLa Cells, Humans, Hydrolysis, Molecular Sequence Data, Nuclear Proteins, Proto-Oncogene Proteins, Tumor Suppressor Protein p53, Mutagenesis, Site-Directed, Apoptosis, DNA Primers, Caspase 1, Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase, Proto-Oncogene Proteins c-mdm2
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