This research introduces histidine scanning as a versatile engineering strategy to improve the signaling strength of T cell receptors and other mechanosensory proteins. By replacing specific residues with histidine, the scientists identified hotspots that promote the formation of catch bonds, which are molecular interactions that strengthen when subjected to physical force. This method allows for the creation of low-affinity, high-potency TCRs that effectively kill tumor cells while avoiding the off-target toxicity often seen in traditional high-affinity therapies. The study demonstrates that this technique is not limited to immunology but can also modulate signaling in other systems, such as DLL4-Notch and Fc-FcR interactions. Ultimately, this approach provides a structural blueprint for designing more precise and powerful immunotherapies for solid tumors and blood cancers.

References:

• Wang Y, Wang Y, Yuan W, et al. Tuning the sensitivity of mechanosensory receptors through histidine scanning[J]. Cell, 2026.