DNA origami carrying a barnase variant is built to cleave mutant KRAS mRNA
- Mutant KRAS variants are structurally diverse and lack druggable pockets, which has limited small-molecule inhibitors.
- The authors assemble a degrader on a six-helix-bundle DNA origami scaffold that targets the mRNA rather than the protein.
- One module pairs an engineered barnase variant with a programmable recognition strand, cutting RNA directly without relying on endogenous cellular machinery; a second module is designed for cell penetration.
💡 Points
If KRAS has no pocket worth chasing, going after the mRNA is a fair dodge, and a catalytic barnase gives a clean mechanism: sequence-guided cleavage, no reliance on endogenous machinery. But I would want to see the data before getting excited. How well does the recognition strand discriminate single-base mutants from wild-type KRAS, given barnase's cleavage is catalytic and unforgiving of leakage? And does it survive delivery, with real potency in cells and a sensible comparison to siRNA or ASO?