3ZY0

Crystal structure of a truncated variant of the human p63 tetramerization domain lacking the C-terminal helix


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and Kinetic Stability of the P63 Tetramerization Domain.

Natan, E.Joerger, A.C.

(2012) J Mol Biol 415: 503

  • DOI: 10.1016/j.jmb.2011.11.007
  • Primary Citation of Related Structures:  
    3ZY0, 3ZY1

  • PubMed Abstract: 
  • The p53 family of transcription factors--comprising p53, p63 and p73--plays an important role in tumor prevention and development. Essential to their function is the formation of tetramers, allowing cooperative binding to their DNA response elements. We solved crystal structures of the human p63 tetramerization domain, showing that p63 forms a dimer of dimers with D₂ symmetry composed of highly intertwined monomers ...

    The p53 family of transcription factors--comprising p53, p63 and p73--plays an important role in tumor prevention and development. Essential to their function is the formation of tetramers, allowing cooperative binding to their DNA response elements. We solved crystal structures of the human p63 tetramerization domain, showing that p63 forms a dimer of dimers with D₂ symmetry composed of highly intertwined monomers. The primary dimers are formed via an intramolecular β-sheet and hydrophobic helix packing (H1), a hallmark of all p53 family members. Like p73, but unlike p53, p63 requires a second helix (H2) to stabilize the architecture of the tetramer. In order to investigate the impact of structural differences on tetramer stability, we measured the subunit exchange reaction of p53 family homotetramers by nanoflow electrospray mass spectrometry. There were differences in both the kinetics and the pattern of the exchange reaction, with the p53 and p63 tetramers exhibiting much faster exchange kinetics than p73. The structural similarity between p63 and p73 rationalizes previous observations that p63 and p73 form mixed tetramers, and the kinetic data reveal the dissociation of the p73 homotetramers as the rate-limiting step for heterotetramer formation. Differential stability of the tetramers may play an important role in the cross talk between different isoforms and regulation of p53, p63 and p73 function in the cell cycle.


    Organizational Affiliation

    Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TUMOR PROTEIN P63A, B, C, D32Homo sapiensMutation(s): 0 
Gene Names: TP63KETP63P73HP73LTP73L
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H3D4 (Homo sapiens)
Explore Q9H3D4 
Go to UniProtKB:  Q9H3D4
PHAROS:  Q9H3D4
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, DL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 30.14α = 105.33
b = 33.13β = 102.07
c = 34.68γ = 110.15
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2011-08-16 
  • Released Date: 2011-11-30 
  • Deposition Author(s): Joerger, A.C.

Revision History  (Full details and data files)

  • Version 1.0: 2011-11-30
    Type: Initial release
  • Version 1.1: 2012-01-25
    Changes: Other
  • Version 1.2: 2019-05-08
    Changes: Data collection, Derived calculations, Experimental preparation, Other