Cited by 169Cancer-related Molecular PathwaysUbiquitin and proteasome pathwaysHeat shock proteins research

Different effects of p14ARF on the levels of ubiquitinated p53 and Mdm2 in vivo

Xirodimas, Dimitris, Saville, Mark K, Edling, Charlotte, Lane, David P, Laín, Sonia·2001·Oncogene

Abstract

Mdm2 has been shown to promote its own ubiquitination and the ubiquitination of the p53 tumour suppressor by virtue of its E3 ubiquitin ligase activity. This modification targets Mdm2 and p53 for degradation by the proteasome. The p14ARF tumour suppressor has been shown to inhibit degradation of p53 mediated by Mdm2. Several models have been proposed to explain this effect of p14ARF. Here we have compared the effects of p14ARF overexpression on the in vivo ubiquitination of p53 and Mdm2. We report that the inhibition of the Mdm2-mediated degradation of p53 by p14ARF is associated with a decrease in the proportion of ubiquitinated p53. The levels of polyubiquitinated p53 decreased preferentially compared to monoubiquitinated species. p14ARF overexpression increased the levels of Mdm2 but it did not reduce the overall levels of ubiquitinated Mdm2 in vivo. This is unexpected because p14ARF has been reported to inhibit the ubiquitination of Mdm2 in vitro. In addition we show that like p14ARF, the proteasome inhibitor MG132 can promote the accumulation of Mdm2 in the nucleolus and that this can occur in the absence of p14ARF expression. We also show that the mutation of the nucleolar localization signal of Mdm2 does not impair the overall ubiquitination of Mdm2 but is necessary for the effective polyubiquitination of p53. These studies reveal important differences in the regulation of the stability of p53 and of Mdm2.

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Crossref · 10.1038/sj.onc.1204656

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  • p14ARF inhibits polyubiquitylation of p53 while Mdm2 ubiquitylation is unaffected.

    “p14ARF inhibits the poly-ubiquitylation of p53 while the ubiquitylation of Mdm2 is unaffected (Xirodimas et al., 2001).”

    From Mdmx stabilizes p53 and Mdm2 via two distinct mechanisms (2001) · cites this paper as Xirodimas et al., 2001

  • p14ARF stabilizes Mdm2 and blocks Mdm2-mediated p53 degradation, but its effects on p53 and Mdm2 ubiquitylation are opposite to Mdmx.

    “While p14ARF also stabilizes Mdm2 and blocks Mdm2-mediated degradation of p53, its effects on p53 and Mdm2 ubiquitylation are the opposite of Mdmx.”

    From Mdmx stabilizes p53 and Mdm2 via two distinct mechanisms (2001) · cites this paper as Xirodimas et al., 2001

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Authors
Xirodimas, D., Saville, M. K., Edling, C., Lane, D. P., & Laín, S.
Affiliations
University of Dundee (GB)
Venue
Oncogene
Published
2001-08-16
Volume
20
Issue
36
Pages
4972-4983
ISSN
  • 0950-9232 (ISSN-L)
  • 1476-5594
OpenAlex
W2050259175
Cited by
169
References
37
Citations by year
2024: 2 · 2023: 1 · 2021: 4 · 2020: 2 · 2019: 6 · 2018: 6 · 2017: 5 · 2016: 3 · 2015: 5 · 2014: 6 · 2013: 6 · 2012: 9
FWCI
5.55
Type
journal article
Language
en
Open access
closed
Locations
  • Oncogene (publishedVersion)
  • PubMed (publishedVersion)
  • Discovery Research Portal (University of Dundee) (publishedVersion)
  • HAL (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
p14ARF, p53, MDM2, ubiquitination, polyubiquitination, monoubiquitination, proteasomal degradation, E3 ubiquitin ligase, protein stability, nucleolar localization signal, MG132, tumor suppressor regulation
MeSH terms
Animals, Cell Line, Cell Nucleolus, Cysteine Endopeptidases, Leupeptins, Multienzyme Complexes, Nuclear Proteins, Proteins, Proto-Oncogene Proteins, Transfection, Ubiquitins, Cysteine Proteinase Inhibitors, Tumor Suppressor Protein p53, Tumor Suppressor Protein p14ARF, Proteasome Endopeptidase Complex, Proto-Oncogene Proteins c-mdm2

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