Study summary · research use only
Structural plasticity of the FOXO-DBD:p53-TAD interaction
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
In this structural biology study (human transcription factor domains, examined via NMR and molecular simulation), the authors examined interactions between the FOXO4 Forkhead DNA-binding domain (FOXO4-DBD) and the p53 transactivation domain (p53-TAD). The abstract reports that these interactions are highly heterogeneous, with the p53 transactivation domain primarily interacting with the N-terminal helical bundle of the FOXO4 Forkhead domain while retaining substantial flexibility in the complex. NMR data-driven molecular simulations suggested that p53 interacts with FOXO4 through multiple binding modes. The authors describe these findings as providing structural insight into the FOXO4-p53 interaction and its potential relevance to developing senolytic compounds.
Abstract
The transcription factors FOXO4 and p53 regulate aging, and their deregulation has been linked to several diseases, including cancer. Under stress conditions, cellular senescence is promoted by p53 sequestration and senescence-associated protein p21 transcriptional upregulation induced by interactions between the FOXO4 Forkhead DNA-binding domain and the p53 transactivation domain. However, the molecular details of these interactions remain unclear. Here, we report that these interactions between p53 and FOXO4 domains are highly heterogeneous. The p53 transactivation domain primarily interacts with the region formed by the N-terminal helical bundle of the FOXO4 Forkhead domain but retains a substantial degree of flexibility in the complex. In addition, NMR data-driven molecular simulations suggest that p53 interacts with FOXO4 through multiple binding modes. Overall, our findings not only provide the structural insights into interactions between FOXO4 and p53 but also highlight their potential as targets for developing senolytic compounds.
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