Investigating the therapeutic potential of soluble TREM2 interactions with Transgelin-2 in Alzheimer's disease

All-atom molecular dynamics simulations define an electrostatically driven sTREM2–TG2 binding interface centered on the TG2 calponin homology domain, with a motif that preserves affinity.

• Why it matters: The sTREM2–transgelin-2 interaction is linked to modulation of downstream tau pathology in Alzheimer’s disease, but its molecular basis was unknown.
• What they did: Simulations mapped the binding mechanism and showed that the AD-risk TREM2R47H variant keeps a more open, solvent-exposed CDR2 loop that redistributes interfacial contacts while preserving overall binding affinity.
• The result: Structure-guided sTREM2-derived peptides were designed to outperform a previously reported therapeutic peptide in binding persistence, energetics, and native TG2 contact recapitulation, supporting epitope engagement linked to reduced tau phosphorylation.

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