Cited by 121Cancer-related Molecular PathwaysCell death mechanisms and regulationUbiquitin and proteasome pathways

Proteolytic Cleavage of the mdm2 Oncoprotein during Apoptosis

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Chen, Lihong, Marechal, Vincent, Moreau, Jacques, Levine, Arnold J., Chen, Jiandong·1997·Journal of Biological Chemistry

Abstract

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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Crossref · 10.1074/jbc.272.36.22966

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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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Research works printed but not linked: 3

  1. Lin, D., Shields, M. T., Ullrich, S. J., Appella, E., and Mercer, W. E. (1992) Proc. Natl. Acad. Sci. U. S. A. 89, 9210 -9214
  2. Chen, C. Y., Oliner, J. D., Zhan, Q., Fornace, A. J., Jr., Vogelstein, B., and Kastan, M. B. (1994) Proc. Natl. Acad. Sci. U. S. A. 91, 2684 -2688
  3. Lazebnik, Y. A., Takahashi, A., Moir, R. D., Goldman, R. D., Poirier, G. G., Kaufmann, S. H., and Earnshaw, W. C. (1995) Proc. Natl. Acad. Sci.

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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
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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