7OB8 image
Entry Detail
PDB ID:
7OB8
Keywords:
SIGNALING PROTEIN
Title:
Crystal structure of 14-3-3 sigma in complex with LDB1 phosphopeptide and stabilizer Fusicoccin-A
Biological Source:
Source Organism:
Homo sapiens
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2021-04-21
Release Date:
2022-05-04
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
1.80 Å
R-Value Free:
0.19
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
C 2 2 21
7OB8 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:14-3-3 protein sigma
Chain IDs:A
Chain Length:253
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P31947 Pfam ID:PF00244
Protein Blast
Polymer Type:polypeptide(L)
Description:LDB1 phosphopeptide
Chain IDs:B
Chain Length:11
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:Q86U70
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
CSO A CYS modified residue
SEP B SER modified residue
Ligand Molecules
CL
FSC
MG
Primary Citation
IFN alpha primes cancer cells for Fusicoccin-induced cell death via 14-3-3 PPI stabilization.
Cell Chem Biol ? ? ? (2023)
PMID: 37130519 DOI: 10.1016/j.chembiol.2023.04.005

Abstact

The natural product family of the fusicoccanes (FCs) has been shown to display anti-cancer activity, especially when combined with established therapeutic agents. FCs stabilize 14-3-3 protein-protein interactions (PPIs). Here, we tested combinations of a small library of FCs with interferon α (IFNα) on different cancer cell lines and report a proteomics approach to identify the specific 14-3-3 PPIs that are induced by IFNα and stabilized by FCs in OVCAR-3 cells. Among the identified 14-3-3 target proteins are THEMIS2, receptor interacting protein kinase 2 (RIPK2), EIF2AK2, and several members of the LDB1 complex. Biophysical and structural biology studies confirm these 14-3-3 PPIs as physical targets of FC stabilization, and transcriptome as well as pathway analyses suggest possible explanations for the observed synergistic effect of IFNα/FC treatment on cancer cells. This study elucidates the polypharmacological effects of FCs in cancer cells and identifies potential targets from the vast interactome of 14-3-3s for therapeutic intervention in oncology.

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Disease

Primary Citation of related structures
7OB8