3D07

Human p53 core domain with hot spot mutation R249S (III)

PDB DOI: 10.2210/pdb3D07/pdb

Classification: TRANSCRIPTION
Organism(s): Homo sapiens
Expression System: Escherichia coli
Mutation(s): Yes

Deposited: 2008-05-01 Released: 2009-01-20
Deposition Author(s): Suad, O., Rozenberg, H., Shakked, Z.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.20 Å
R-Value Free: 0.256
R-Value Work: 0.163
R-Value Observed: 0.168

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

Literature

Structural basis of restoring sequence-specific DNA binding and transactivation to mutant p53 by suppressor mutations

Suad, O., Rozenberg, H., Brosh, R., Diskin-Posner, Y., Kessler, N., Shimon, L.J.W., Frolow, F., Liran, A., Rotter, V., Shakked, Z.

(2009) J Mol Biol 385: 249-265

PubMed: 18996393 Search on PubMed
DOI: 10.1016/j.jmb.2008.10.063
Primary Citation of Related Structures:
3D05, 3D06, 3D07, 3D08, 3D09, 3D0A

PubMed Abstract:

The tumor suppressor protein p53 is mutated in more than 50% of invasive cancers. About 30% of the mutations are found in six major "hot spot" codons located in its DNA binding core domain. To gain structural insight into the deleterious effects of such mutations and their rescue by suppressor mutations, we determined the crystal structures of the p53 core domain incorporating the hot spot mutation R249S, the core domain incorporating R249S and a second-site suppressor mutation H168R (referred to as the double mutant R249S/H168R) and its sequence-specific complex with DNA and of the triple mutant R249S/H168R/T123A. The structural studies were accompanied by transactivation and apoptosis experiments. The crystal structures show that the region at the vicinity of the mutation site in the R249S mutant displays a range of conformations [wild-type (wt) and several mutant-type conformations] due to the loss of stabilizing interactions mediated by R249 in the wt protein. As a consequence, the protein surface that is critical to the formation of functional p53-DNA complexes, through protein-protein and protein-DNA interactions, is largely distorted in the mutant conformations, thus explaining the protein's "loss of function" as a transcription factor. The structure of this region is restored in both R249S/H168R and R249S/H168R/T123A and is further stabilized in the complex of R249S/H168R with DNA. Our functional data show that the introduction of H168R as a second-site suppressor mutation partially restores the transactivation capacity of the protein and that this effect is further amplified by the addition of a third-site mutation T123A. These findings together with previously reported data on wt and mutant p53 provide a structural framework for understanding p53 dysfunction as a result of oncogenic mutations and its rescue by suppressor mutations and for a potential drug design aimed at restoring wt activity to aberrant p53 proteins.

Organizational Affiliation:

Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel.

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cellular tumor antigen p53	A, B	200	Homo sapiens	Mutation(s): 1 Gene Names: TP53, P53
UniProt & NIH Common Fund Data Resources
Find proteins for P04637 (Homo sapiens) Explore P04637 Go to UniProtKB: P04637
PHAROS: P04637 GTEx: ENSG00000141510
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P04637
Protein Feature View Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
ZN Query on ZN Download Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain D [auth B] MOL2 format, chain C [auth A] MOL2 format, chain D [auth B]	C [auth A], D [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N		Ligand Interaction