4MZR

Crystal structure of a polypeptide p53 mutant bound to DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.234 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Reversal of the DNA-Binding-Induced Loop L1 Conformational Switch in an Engineered Human p53 Protein.

Emamzadah, S.Tropia, L.Vincenti, I.Falquet, B.Halazonetis, T.D.

(2014) J.Mol.Biol. 426: 936-944

  • DOI: 10.1016/j.jmb.2013.12.020
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The gene encoding the p53 tumor suppressor protein, a sequence-specific DNA binding transcription factor, is the most frequently mutated gene in human cancer. Crystal structures of homo-oligomerizing p53 polypeptides with specific DNA suggest that DN ...

    The gene encoding the p53 tumor suppressor protein, a sequence-specific DNA binding transcription factor, is the most frequently mutated gene in human cancer. Crystal structures of homo-oligomerizing p53 polypeptides with specific DNA suggest that DNA binding is associated with a conformational switch. Specifically, in the absence of DNA, loop L1 of the p53 DNA binding domain adopts an extended conformation, whereas two p53 subunits switch to a recessed loop L1 conformation when bound to DNA as a tetramer. We previously designed a p53 protein, p53FG, with amino substitutions S121F and V122G targeting loop L1. These two substitutions enhanced the affinity of p53 for specific DNA yet, counterintuitively, decreased the residency time of p53 on DNA. Here, we confirmed these DNA binding properties of p53FG using a different method. We also determined by crystallography the structure of p53FG in its free state and bound to DNA as a tetramer. In the free state, loop L1 adopted a recessed conformation, whereas upon DNA binding, two subunits switched to the extended loop L1 conformation, resulting in a final structure that was very similar to that of wild-type p53 bound to DNA. Thus, altering the apo structure of p53 changed its DNA binding properties, even though the DNA-bound structure was not altered.


    Organizational Affiliation

    Department of Molecular Biology, University of Geneva, 1205 Geneva, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cellular tumor antigen p53
A, B, C, D
237Homo sapiensMutation(s): 2 
Gene Names: TP53 (P53)
Find proteins for P04637 (Homo sapiens)
Go to Gene View: TP53
Go to UniProtKB:  P04637
Entity ID: 2
MoleculeChainsLengthOrganism
consensus DNA sense strandK26N/A
Entity ID: 3
MoleculeChainsLengthOrganism
consensus DNA anti-sense strandL26N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B, C, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.234 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 163.298α = 90.00
b = 169.764β = 90.00
c = 55.664γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
CNSphasing
CNSrefinement
MxCuBEdata collection
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-01-15
    Type: Initial release
  • Version 1.1: 2014-02-12
    Type: Database references