Covalent Fragments Acting as Tyrosine Mimics for Mutant p53-Y220C Rescue by Nucleophilic Aromatic Substitution.

ABSTRACT: The tumor suppressor p53 is frequently mutated in human cancers. The Y220C mutant is the ninth most common p53 cancer mutant and is classified as a structural mutant, as it leads to strong thermal destabilization and degradation by creating a solvent-accessible hydrophobic cleft. To identify small molecules that thermally stabilize p53, we employed DSF to screen S_NAr-type electrophiles from our covalent fragment library (CovLib) for binding to different structural (Y220C, R282W) and DNA contact (R273H) mutants of p53. The reactive fragments SN001, SN006, and SN007 were detected to specifically stabilize Y220C, indicating the arylation of Cys220 in the mutational cleft, as confirmed by X-ray crystallography. The fragments occupy the central cavity and mimic the ring system of the

SUBMITTER: Klett T 

PROVIDER: S-EPMC11651176 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature