Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 6-mer - A6 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 0.75 kDa 
• Atom Count: 51 
• Residue Count: 6 
• Unique protein chains: 1

4RP7

Structure of the amyloid-forming segment TIITLE from p53 (residues 253-258)

• DOI: 10.2210/pdb4RP7/pdb

• Classification: PROTEIN FIBRIL
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 2014-10-29 Released: 2016-01-13 
• Deposition Author(s): Soriaga, A.B., Soragni, A., Eisenberg, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.58 Å
• R-Value Free: 0.193 
• R-Value Work: 0.164 
• R-Value Observed: 0.167 

Literature

A Designed Inhibitor of p53 Aggregation Rescues p53 Tumor Suppression in Ovarian Carcinomas.

Soragni, A., Janzen, D.M., Johnson, L.M., Lindgren, A.G., Thai-Quynh Nguyen, A., Tiourin, E., Soriaga, A.B., Lu, J., Jiang, L., Faull, K.F., Pellegrini, M., Memarzadeh, S., Eisenberg, D.S.

(2016) Cancer Cell 29: 90-103

• PubMed: 26748848 
• DOI: 10.1016/j.ccell.2015.12.002
• Primary Citation of Related Structures:  
  4RP6, 4RP7


• PubMed Abstract: 
  

Half of all human cancers lose p53 function by missense mutations, with an unknown fraction of these containing p53 in a self-aggregated amyloid-like state. Here we show that a cell-penetrating peptide, ReACp53, designed to inhibit p53 amyloid formation, rescues p53 function in cancer cell lines and in organoids derived from high-grade serous ovarian carcinomas (HGSOC), an aggressive cancer characterized by ubiquitous p53 mutations. Rescued p53 behaves similarly to its wild-type counterpart in regulating target genes, reducing cell proliferation and increasing cell death. Intraperitoneal administration decreases tumor proliferation and shrinks xenografts in vivo. Our data show the effectiveness of targeting a specific aggregation defect of p53 and its potential applicability to HGSOCs.

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Organizational Affiliation: 

Departments of Biological Chemistry and Chemistry and Biochemistry, UCLA-DOE Institute, HHMI, 611 South Charles E. Young Drive, Los Angeles, CA 90095-1570, USA. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
TIITLE hexapeptide segment from p53	Z	6	Homo sapiens	Mutation(s): 0  Gene Names: TP53, P53
Find proteins for P04637 (Homo sapiens) Explore P04637  Go to UniProtKB:  P04637
NIH Common Fund Data Resources
PHAROS  P04637 GTEx  ENSG00000141510

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	Z	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.58 Å
• R-Value Free: 0.193 
• R-Value Work: 0.164 
• R-Value Observed: 0.167 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 43.018	α = 90
b = 4.849	β = 92.12
c = 19.774	γ = 90

Software Package:

Software Name	Purpose
ADSC	data collection
PHASER	phasing
PHENIX	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-10-29 
• Released Date: 2016-01-13 
Deposition Author(s): Soriaga, A.B., Soragni, A., Eisenberg, D.

Revision History 

• Version 1.0: 2016-01-13
  Type: Initial release
  
• Version 1.1: 2016-01-27
  Changes: Database references