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Chemoproteomic capture of RNA binding activity in living cells.

Nature communications | 2023

Proteomic methods for RNA interactome capture (RIC) rely principally on crosslinking native or labeled cellular RNA to enrich and investigate RNA-binding protein (RBP) composition and function in cells. The ability to measure RBP activity at individual binding sites by RIC, however, has been more challenging due to the heterogenous nature of peptide adducts derived from the RNA-protein crosslinked site. Here, we present an orthogonal strategy that utilizes clickable electrophilic purines to directly quantify protein-RNA interactions on proteins through photoaffinity competition with 4-thiouridine (4SU)-labeled RNA in cells. Our photo-activatable-competition and chemoproteomic enrichment (PACCE) method facilitated detection of >5500 cysteine sites across ~3000 proteins displaying RNA-sensitive alterations in probe binding. Importantly, PACCE enabled functional profiling of canonical RNA-binding domains as well as discovery of moonlighting RNA binding activity in the human proteome. Collectively, we present a chemoproteomic platform for global quantification of protein-RNA binding activity in living cells.

Pubmed ID: 37805600 RIS Download

Associated grants

  • Agency: NIAID NIH HHS, United States
    Id: R01 AI169412
  • Agency: NIDA NIH HHS, United States
    Id: R01 DA043571
  • Agency: NIGMS NIH HHS, United States
    Id: R01 GM136900
  • Agency: NIGMS NIH HHS, United States
    Id: R01 GM144472
  • Agency: NIGMS NIH HHS, United States
    Id: T32 GM007055
  • Agency: NIGMS NIH HHS, United States
    Id: T32 GM136615
  • Agency: NCI NIH HHS, United States
    Id: P30 CA044579
  • Agency: NIGMS NIH HHS, United States
    Id: T32 GM148379

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