8BI7

Binary structure of 14-3-3s and PKR phosphopeptide

Summary for 8BI7

• Entry DOI: 10.2210/pdb8bi7/pdb
• Descriptor: 14-3-3 protein sigma, PKR phosphopeptide, MAGNESIUM ION, ... (4 entities in total)
• Functional Keywords: 14-3-3, hub-protein, phosphopeptide, peptide binding protein
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 2
• Total formula weight: 28052.60

Authors

Somsen, B.A.,Ottmann, C. (deposition date: 2022-11-01, release date: 2023-03-29, Last modification date: 2024-02-07)

Primary citation

Somsen, B.A.,Schellekens, R.J.C.,Verhoef, C.J.A.,Arkin, M.R.,Ottmann, C.,Cossar, P.J.,Brunsveld, L.
Reversible Dual-Covalent Molecular Locking of the 14-3-3/ERR gamma Protein-Protein Interaction as a Molecular Glue Drug Discovery Approach.
J.Am.Chem.Soc., 145:6741-6752, 2023

PubMed Abstract: Molecules that stabilize protein-protein interactions (PPIs) are invaluable as tool compounds for biophysics and (structural) biology, and as starting points for molecular glue drug discovery. However, identifying initial starting points for PPI stabilizing matter is highly challenging, and chemical optimization is labor-intensive. Inspired by chemical crosslinking and reversible covalent fragment-based drug discovery, we developed an approach that we term "molecular locks" to rapidly access molecular glue-like tool compounds. These dual-covalent small molecules reversibly react with a nucleophilic amino acid on each of the partner proteins to dynamically crosslink the protein complex. The PPI between the hub protein 14-3-3 and estrogen-related receptor γ (ERRγ) was used as a pharmacologically relevant case study. Based on a focused library of dual-reactive small molecules, a molecular glue tool compound was rapidly developed. Biochemical assays and X-ray crystallographic studies validated the ternary covalent complex formation and overall PPI stabilization via dynamic covalent crosslinking. The molecular lock approach is highly selective for the specific 14-3-3/ERRγ complex, over other 14-3-3 complexes. This selectivity is driven by the interplay of molecular reactivity and molecular recognition of the composite PPI binding interface. The long lifetime of the dual-covalent locks enabled the selective stabilization of the 14-3-3/ERRγ complex even in the presence of several other competing 14-3-3 clients with higher intrinsic binding affinities. The molecular lock approach enables systematic, selective, and potent stabilization of protein complexes to support molecular glue drug discovery.

PubMed: 36926879
DOI: 10.1021/jacs.2c12781

Experimental method

X-RAY DIFFRACTION (1.4 Å)