C2 edits on trehalose glycolipids show Mincle ligands bind in more than one way
- Mincle, a C-type lectin that senses TDM-like glycolipids, is a vaccine-adjuvant target; earlier SAR mostly explored the lipid tail.
- 2-C-substituted pseudo-TDMs made by sequential Tsuji–Trost-type reactions only weakly activated Mincle, so the native C-2 hydroxyl matters for trehalose esters.
- An exomethylene at C-2, which had boosted glucosylceramide agonists, did not transfer; modeling explained the difference and guided a 6-behenate pseudo-α-GlcCer with improved activation.
- The data point to multiple binding modes for α-glucosylceramide-type ligands.
💡 Points Based on the abstract
Negative SAR is useful here: it warns that a modification that works in one glycolipid class can't be ported to another, so Mincle design needs scaffold-specific models. The binding-mode claim rests on modeling and activity data only; a co-crystal or mutagenesis of the binding site would make it far more convincing.
📄 Paper · ACS Chemical Biology (ACS) ↗ Editing the C2 Position of Glycolipid Ligands Reveals Ligand-Dependent Recognition by Mincle