Cited by 129Cancer-related Molecular PathwaysUbiquitin and proteasome pathwaysProtein Structure and Dynamics

Solution structure of the Hdm2 C2H2C4 RING, a domain critical for ubiquitination of p53

Kostic, Milka, Matt, Theresia, Martinez-Yamout, Maria A., Dyson, H. Jane, Wright, Peter E.·2006·Journal of Molecular Biology

Abstract

Regulation of the transcriptional response to the tumor suppressor p53 occurs at many levels, including control of its transcriptional activity, and of its stability and concentration within the cell. p53 stability is regulated by the protein Hdm2, an E3 ubiquitin ligase that binds to p53 and promotes its ubiquitination and degradation. The C-terminal domain of Hdm2, which is critical for this activity, has been classified as a RING domain on the basis of sequence homology, although it lacks the canonical set of zinc ligands (RING domains typically have C3HC4 or C4C4 zinc coordination). Here, we report the solution structure of the C2H2C4 RING domain of Hdm2(429-491), which reveals a symmetrical dimer with a unique cross-brace zinc-binding scheme. Each subunit has one Cys4 Zn site and one His2Cys2 Zn site. The global fold of each subunit is similar to those reported for other RING domains, with a compact betabetaalphabeta fold, a small hydrophobic core, and two Zn ions, which are essential for maintaining the domain structure. The dimer structure is maintained by an extensive interface that buries a large hydrophobic area on each subunit. It has been proposed that Hdm2 and its homologue HdmX form a stable heterodimer through their RING domains, resulting in a synergistic increase in observed E3 activity. To test this proposal, we prepared an HdmX RING construct and showed by NMR titration that it forms a tight 1:1 complex with the Hdm2 RING. The resonances most perturbed by heterodimer formation are located within the subunit interface of the homodimer, far removed from the surface expected to form the docking site of the E2 ubiquitin-conjugating enzyme, providing a structure-based rationale for the function of the RING domains in p53 ubiquitination.

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Registry

Crossref · 10.1016/j.jmb.2006.08.027

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78 of 78 references verified0 citation errors · 0 not checkable

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  • The C termini of both Mdm2 and Mdmx contain a RING domain of the C2H2C4 type.

    “The C termini of both Mdm2 and Mdmx contain a RING (really interesting new gene) domain of the ‘rare’ C2H2C4 type [8].”

    From The p53 orchestra: Mdm2 and Mdmx set the tone (2010) · cites this paper as [8]

  • The binding mode of E2s appears to be similar for the Mdm2-Mdmx heterodimer.

    “This binding mode of E2 s appears to be similar for the Mdm2–Mdmx heterodimer [8,20].”

    From The p53 orchestra: Mdm2 and Mdmx set the tone (2010) · cites this paper as [8]

  • Structural studies of the homo- and heterodimer are consistent with interaction between the C-terminus of one partner and the RING domain of the other.

    “However, structural studies of the homo- and heterodimer are consistent with interaction between the C- terminus of one partner and the RING domain of the other [8,20].”

    From The p53 orchestra: Mdm2 and Mdmx set the tone (2010) · cites this paper as [8]

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Authors
Kostic, M., Matt, T., Martinez-Yamout, M. A., Dyson, H. J., & Wright, P. E.
Affiliations
Scripps Research Institute (US)
Corresponding author
Wright, Peter E.
Venue
Journal of Molecular Biology
Publisher
Elsevier BV
Published
2006-10
Volume
363
Issue
2
Pages
433-450
ISSN
0022-2836 (ISSN-L)
OpenAlex
W2055458365
Cited by
128
References
80
Citations by year
2026: 1 · 2025: 1 · 2023: 4 · 2022: 5 · 2021: 8 · 2020: 3 · 2019: 4 · 2018: 6 · 2017: 6 · 2016: 6 · 2015: 3 · 2014: 13 · 2013: 7 · 2012: 11
FWCI
5.55
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Molecular Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of General Medical Sciences (GM-36643, R01GM036643)
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 › Protein Structure and Dynamics
Keywords
MDM2, p53 ubiquitination, E3 ubiquitin ligase, zinc binding site, zinc coordination, homodimer structure, HDMX, heterodimer formation, p53 stabilization, solution structure
MeSH terms
Amino Acid Sequence, Animals, Humans, Models, Molecular, Molecular Sequence Data, Zinc, Sequence Alignment, Protein Structure, Tertiary, Dimerization, Nuclear Magnetic Resonance, Biomolecular, Protein Structure, Quaternary, Protein Subunits, Ubiquitin, Ubiquitin-Conjugating Enzymes, Proto-Oncogene Proteins c-mdm2

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