2. Academic Validation
  3. Targeted citrullination enables p53 binding to non-canonical sites

Targeted citrullination enables p53 binding to non-canonical sites

  • Mol Cell. 2025 Oct 2;85(19):3588-3604.e11. doi: 10.1016/j.molcel.2025.09.004.
Alexandra Indeglia 1,  Andrea Valdespino 2,  Giulia Pantella 3,  Sarah Offley 4,  Connor Hill 4,  Maya Foster 2,  Kaitlyn Casey 5,  Hsin-Yao Tang 6,  Anneliese M Faustino 7,  Alessandro Gardini 8,  Maureen E Murphy 9
Affiliations

Affiliations

  • 1 Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, PA 19104, USA; Graduate Group in Biochemistry and Molecular Biophysics, the University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA. Electronic address: aindeglia@bwh.harvard.edu.
  • 2 Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, PA 19104, USA; Cell and Molecular Biology Graduate Group, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
  • 3 Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, PA 19104, USA; University of Bologna, Bologna, Italy.
  • 4 Program in Gene Regulation and Cell Signaling, The Wistar Institute, Philadelphia, PA 19104, USA; Cell and Molecular Biology Graduate Group, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.
  • 5 Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, PA 19104, USA; Cancer Biology Program, St Joseph's University, Philadelphia, PA, USA.
  • 6 Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, PA 19104, USA; Proteomics and Metabolomics Shared Resource, The Wistar Institute, Philadelphia, PA 19104, USA.
  • 7 Proteomics and Metabolomics Shared Resource, The Wistar Institute, Philadelphia, PA 19104, USA.
  • 8 Program in Gene Regulation and Cell Signaling, The Wistar Institute, Philadelphia, PA 19104, USA.
  • 9 Program in Molecular and Cellular Oncogenesis, The Wistar Institute, Philadelphia, PA 19104, USA. Electronic address: mmurphy@wistar.org.
PMID: 41043392 DOI: 10.1016/j.molcel.2025.09.004
Abstract

TP53 encodes for the transcription factor p53, which binds to a diverse set of target genes in response to stress. Activation of p53 results in highly specific transcriptional responses, but the regulation of promoter selectivity by p53 is poorly understood. Here, we report that sequence-specific binding of p53 is regulated by its target gene and binding partner peptidyl-arginine deiminase 4 (PADI4). PADI4 enzymatically converts peptidyl-arginine to peptidyl citrulline in a process known as citrullination. We show that PADI4 citrullinates p53 at the C terminus in vitro, and we confirm two citrullination events in cells and mouse tissue (R306 and R363). Chromatin immunoprecipitation Sequencing (ChIP-seq) reveals that PADI4 expression causes a redirection of p53 away from a subset of canonical binding sites to target genes associated with ETS transcription factors. Chromatin profiling using citrullination-specific p53 antibodies supports this conclusion. These findings link citrullination to p53 function and illustrate how chromatin modifiers like PADI4 can direct the p53 transcriptional response.

Keywords

ELF2; PADI4; cancer; citrullination; p53.

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