Computational Study Identifies Plant-Derived Peptide as Potential MDM2-p53 Inhibitor
Researchers used computational screening of plant proteomes to identify SPAFESTWDILK, a 12-amino-acid peptide from ginger, as a predicted binder to MDM2—a protein that regulates the tumor suppressor p53. The discovery employed multiple computational methods including AlphaFold 3 co-folding and molecular dynamics simulations, with results showing consistent binding predictions across eight different assessments. The finding is significant because no food-derived linear peptide has previously been documented to engage the MDM2-p53 interface, though the authors acknowledge that experimental validation is needed.
A preprint study describes a multi-stage computational pipeline (PepVeg) that screened over 337,000 proteins from 22 plant and fungal species to identify peptides capable of binding MDM2, a validated cancer drug target. The lead candidate, SPAFESTWDILK, is a 12-residue peptide derived from ginger (Zingiber officinale) histone deacetylase. The researchers evaluated this peptide using eight independent computational methods—including AlphaFold 3, Protenix, Chai-1, molecular dynamics simulations, and binding free energy calculations—all of which predicted favorable binding to the canonical MDM2-p53 interface. A point mutation analysis (W8A) showed predicted loss of binding, mirroring known behavior in p53 itself. The authors validated their computational approach by testing it against a 36-peptide benchmark containing 29 hard negatives, demonstrating strong discriminative power. However, the authors explicitly note that experimental validation via surface plasmon resonance (SPR) or isothermal titration calorimetry (ITC) is warranted before drawing biological conclusions.
Limitations & open questions
The study is purely computational and has not undergone experimental validation. The authors acknowledge this limitation and call for SPR/ITC experiments. Additionally, the biological relevance of a food-derived peptide surviving gastrointestinal digestion and reaching target tissues in vivo is not addressed, which is a standard consideration for dietary peptide bioavailability.
What different sources said
- bioRxivCenter
SPAFESTWDILK, a plant-derived dodecapeptide from Zingiber officinale, as a predicted inhibitor of the MDM2-p53 interaction: computational discovery and multi-method evaluation
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