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14-3-3σ protein is one of the seven isoforms from the highly conserved eukaryotic 14-3-3 protein family. Downregulation of 14-3-3σ expression has been observed in various tumors. TRIM25 is responsible for the proteolytic degradation of 14-3-3σ, in which abrogation of TRIM25 suppressed tumor growth through 14-3-3σ upregulation. However, to date, the exact 14-3-3σ interacting residues of TRIM25 have yet to be resolved. Thus, this study attempts to identify the peptide binding sequence of TRIM25 on 14-3-3σ via both bioinformatics and biophysical techniques. Multiple sequence alignment of the CC domain of TRIM25 revealed five potential peptide binding sequences (Peptide 1–5). Nuclear magnetic resonance (NMR) assay ( 1 H CPMG) identified Peptide 1 as an important sequence for binding to 14-3-3σ. Competition NMR assay suggested that Peptide 1 binds to the amphipathic pocket of 14-3-3σ with an estimated K D  of 116.4 µM by isothermal titration calorimetry. Further in silico docking and molecular dynamics simulations studies proposed that Peptide 1 is likely to interact with Lys49, Arg56, Arg129, and Tyr130 residues at the amphipathic pocket of 14-3-3σ. These results suggest that Peptide 1 may serve as a biological probe or a template to design inhibitors of TRIM25-14-3-3σ interaction as a potentially novel class of anticancer agents. Communicated by Ramaswamy H. Sarma

Identification of peptide binding sequence of TRIM25 on 14-3-3σ by bioinformatics and biophysical techniques