8GJS

Stapled Peptide ALRN-6924 Bound to MDMX

Summary for 8GJS

• Entry DOI: 10.2210/pdb8gjs/pdb
• Descriptor: Protein Mdm4, ACE-LEU-THR-PHE-ALA-GLU-TYR-TRP-ALA-GLN-LEU-DAL-ALA-ALA-ALA-ALA-ALA-DAL (3 entities in total)
• Functional Keywords: stapled peptide inhibitor complex, mdmx, apoptosis
• Biological source: Danio rerio (zebrafish); More
• Total number of polymer chains: 2
• Total formula weight: 12241.35

Authors

Graves, B.J.,Janson, C.,Lukacs, C. (deposition date: 2023-03-16, release date: 2023-07-26, Last modification date: 2024-10-09)

Primary citation

Guerlavais, V.,Sawyer, T.K.,Carvajal, L.,Chang, Y.S.,Graves, B.,Ren, J.G.,Sutton, D.,Olson, K.A.,Packman, K.,Darlak, K.,Elkin, C.,Feyfant, E.,Kesavan, K.,Gangurde, P.,Vassilev, L.T.,Nash, H.M.,Vukovic, V.,Aivado, M.,Annis, D.A.
Discovery of Sulanemadlin (ALRN-6924), the First Cell-Permeating, Stabilized alpha-Helical Peptide in Clinical Development.
J.Med.Chem., 66:9401-9417, 2023

PubMed Abstract: We report the discovery of sulanemadlin (ALRN-6924), the first cell-permeating, stabilized α-helical peptide to enter clinical trials. ALRN-6924 is a "stapled peptide" that mimics the N-terminal domain of the p53 tumor suppressor protein. It binds with high affinity to both MDM2 and MDMX (also known as MDM4), the endogenous inhibitors of p53, to activate p53 signaling in cells having a non-mutant, or wild-type genotype (-WT). Iterative structure-activity optimization endowed ALRN-6924 with favorable cell permeability, solubility, and pharmacokinetic and safety profiles. Intracellular proteolysis of ALRN-6924 forms a long-acting active metabolite with potent MDM2 and MDMX binding affinity and slow dissociation kinetics. At high doses, ALRN-6924 exhibits on-mechanism anticancer activity in -WT tumor models. At lower doses, ALRN-6924 transiently arrests the cell cycle in healthy tissues to protect them from chemotherapy without protecting the -mutant cancer cells. These results support the continued clinical evaluation of ALRN-6924 as an anticancer and chemoprotection agent.

PubMed: 37439511
DOI: 10.1021/acs.jmedchem.3c00623

Experimental method

X-RAY DIFFRACTION (1.75 Å)