Technical Articles

The FGFR4 door opens only when both keys—FGF19 and KLB—are inserted at the same time. This article walks through the four-step assembly of the FGF19-FGFR4-KLB ternary complex and the full process of signal entry.

The uniqueness of RIPTAC technology lies not only in its "hold and kill" mechanism of action but also in the flexibility and breadth of its target selection. Traditional small-molecule inhibitors require targets to have well-defined active pockets and druggable chemical space; PROTACs demand that target proteins be recognized and degraded by the ubiquitin-proteasome system; whereas RIPTAC's sole requirement for a target protein is—its specific overexpression in tumor cells. This extremely low target threshold enables RIPTAC to potentially target a vast number of proteins previously deemed "undruggable." This article dissects the core scientific challenges in RIPTAC molecular design from two dimensions: target selection logic and the thermodynamics of ternary complex formation.

RIPTAC (Regulated Induced Proximity Targeting Chimeras) are a class of heterobifunctional small molecules composed of three parts: one end binds to a tumor-specific target protein (Target Protein, TP), the other end binds to a ubiquitously expressed cell survival essential protein (Effector Protein, EP), and the two are connected by a chemical linker.