4FJ3 image
Deposition Date 2012-06-11
Release Date 2012-09-05
Last Version Date 2024-11-20
Entry Detail
PDB ID:
4FJ3
Title:
14-3-3 isoform zeta in complex with a diphoyphorylated C-RAF peptide
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.95 Å
R-Value Free:
0.20
R-Value Work:
0.15
R-Value Observed:
0.16
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:14-3-3 protein zeta/delta
Gene (Uniprot):YWHAZ
Chain IDs:A, B
Chain Length:235
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:RAF proto-oncogene serine/threonine-protein kinase
Gene (Uniprot):RAF1
Chain IDs:C (auth: P)
Chain Length:36
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
SEP C SER PHOSPHOSERINE
Primary Citation
Synergistic binding of the phosphorylated S233- and S259-binding sites of C-RAF to one 14-3-3zeta dimer
J.Mol.Biol. 423 486 495 (2012)
PMID: 22922483 DOI: 10.1016/j.jmb.2012.08.009

Abstact

C-RAF kinase is a central component of the Ras-RAF-MEK (mitogen-activated protein kinase/extracellular signal-regulated kinase)-ERK (extracellular signal-regulated kinase) pathway, which has been shown to be activated in 30% of human tumors. 14-3-3 proteins inactivate C-RAF by binding to the two N-terminal phosphorylation-dependent binding sites surrounding S233 and S259. 14-3-3 proteins can bind two target sequences located on one polypeptide chain simultaneously, thereby increasing binding affinity compared to single-site binding and possibly allowing regulated 14-3-3 binding through gatekeeper phosphorylation. To date, it was unclear whether 14-3-3 proteins can bind the two N-terminal phosphorylation-dependent binding sites of C-RAF simultaneously. Fluorescence polarization using phosphorylated peptides demonstrated that S233 is the low-affinity and S259 is the high-affinity binding site, while simultaneous engagement of both sites by 14-3-3ζ enhances affinity compared to single-site binding. Determination of a 1:1 stoichiometry for the di-phosphorylated peptide binding to one 14-3-3ζ dimer with isothermal titration calorimetry was supported by the crystal structure of the 14-3-3ζ/C-RAFpS233,pS259 complex. Cellular localization studies validate the significance of these sites for cytoplasmic retention of C-RAF, suggesting an extended mechanism of RAF regulation by 14-3-3 proteins.

Legend

Protein

Chemical

Disease

Primary Citation of related structures