Computational Design and Evaluation of De Novo Protein Minibinders Targeting Specific Sites of STAT3

Eleven high-confidence STAT3 minibinder designs were generated against seven SH2/linker/DNA-binding/coiled-coil hotspots, and all are predicted by AlphaFold3 to dock to intended domains.

• Why it matters: Small-molecule STAT3 inhibitors have had a high failure rate in clinical trials, motivating alternative binding-based approaches to target STAT3 sites.
• What they did: Using BindCraft, 139 designs passed filters and 11 emerged from five hotspots, then AlphaFold3 predicted docking to targeted hotspot residues, often within 4.5 [A].
• The result: BLASTp found no matches for six binders and only very low-significance matches for five, and some pairs are predicted to dock simultaneously without overlap, enabling potential STAT3 sandwich assays.