Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Solution structure of the p53 regulatory domain of the p19Arf tumor suppressor protein.

DiGiammarino, E.L.Filippov, I.Weber, J.D.Bothner, B.Kriwacki, R.W.

(2001) Biochemistry 40: 2379-2386

  • DOI: https://doi.org/10.1021/bi0024005
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Arf is a tumor suppressor that regulates p53 function and is a frequent target for loss in human cancers. Through two novel mechanisms, Arf inhibits the oncoprotein Hdm2, a negative regulator of p53. (1) Arf inhibits the E3 ubiquitin ligase activity of Hdm2 that leads to p53 degradation, and (2) Arf sequesters Hdm2 within nucleoli. These activities of Arf promote p53-mediated cell cycle arrest and apoptosis. Fundamental to these processes are interactions between Arf and Hdm2. Here we show that a peptide containing the 37 N-terminal amino acids of mouse Arf (mArfN37) localizes to nucleoli, sequesters Hdm2 within nucleoli, and causes cell cycle arrest. Circular dichroism and NMR spectroscopy show that mArfN37 is largely unstructured under aqueous conditions; however, the peptide adopts two alpha-helices (helix 1, residues 4-14; and helix 2, residues 20-29) in 2,2,2-trifluoroethanol (TFE). Each helix contains an amino acid motif that is repeated twice in mArfN37, once in each helix. The two helices, however, do not interact but are connected by an apparently flexible linker. The repeated motif contains Arg residues spaced by a hydrophobic segment that may be involved in Hdm2 recognition and binding. The RRPR nucleolar localization signal, contained within residues 31-34, appears to be disordered under all conditions. The identification of two Arf structural modules suggests that short peptides containing the repeated motif may function as Arf mimics and may allow the design of small molecule Arf mimics in the future.

  • Organizational Affiliation

    Department of Structural Biology and Howard Hughes Medical Institute, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
P19 ARF PROTEIN40Mus musculusMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q64364 (Mus musculus)
Explore Q64364 
Go to UniProtKB:  Q64364
IMPC:  MGI:104738
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ64364
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-12-05
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-05-22
    Changes: Data collection