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Tumor suppressors p53, p63 and p73 comprise a family of stress-responsive transcription factors with distinct functions in development and tumor suppression. Most human cancers lose p53 function, yet all three proteins are capable of inducing apoptosis or cellular senescence. Mechanisms are therefore under investigation to activate p73-dependent apoptosis in p53-deficient cancer cells. Significantly, the DNA-binding domain (DBD) of p73 escapes viral oncoproteins and displays an enhanced thermal stability. To further understand the variant features of p73, we solved the high-resolution crystal structure of the p73 DBD as well as its complex with the ankyrin repeat and SH3 domains of the pro-apoptotic factor ASPP2. The p73 structure exhibits the same conserved architecture as p53 but displays a divergent L2 loop, a known site of protein-protein interaction. The loop in p73 is changed by a two-residue insertion that also induces repacking around the site of the p53 mutational hotspot R175. Importantly, the binding of ASPP2 is preserved by conformational changes in both the ankyrin repeat and SH3 domains. These results further highlight the structural variation that impacts p53 family interactions within the p53 interactome.

Original publication

DOI

10.1016/j.jmb.2012.08.005

Type

Journal article

Journal

J Mol Biol

Publication Date

02/11/2012

Volume

423

Pages

515 - 527

Keywords

Amino Acid Sequence, Ankyrin Repeat, Apoptosis, Apoptosis Regulatory Proteins, Cell Line, Tumor, Crystallography, X-Ray, DNA-Binding Proteins, Genes, Tumor Suppressor, Humans, Nuclear Proteins, Protein Structure, Tertiary, Tumor Protein p73, Tumor Suppressor Protein p53, Tumor Suppressor Proteins, src Homology Domains