Wednesday, July 31, 2024

Template-assisted covalent modification underlies activity of covalent molecular glues

Yen-Der Li, Michelle W. Ma, Muhammad Murtaza Hassan, Moritz Hunkeler, Mingxing Teng, Kedar Puvar, Justine C. Rutter, Ryan J. Lumpkin, Brittany Sandoval, Cyrus Y. Jin, Anna M. Schmoker, Scott B. Ficarro, Hakyung Cheong, Rebecca J. Metivier, Michelle Y. Wang, Shawn Xu, Woong Sub Byun, Brian J. Groendyke, Inchul You, Logan H. Sigua, Isidoro Tavares, Charles Zou, Jonathan M. Tsai, Paul M. C. Park, Hojong Yoon, Felix C. Majewski, Haniya T. Sperling, Jarrod A. Marto, Jun Qi, Radosław P. Nowak, Katherine A. Donovan, Mikołaj Słabicki, Nathanael S. Gray, Eric S. Fischer & Benjamin L. Ebert

 Nat Chem Biol, 2024

https://doi.org/10.1038/s41589-024-01668-4

Molecular glues are proximity-inducing small molecules that have emerged as an attractive therapeutic approach. However, developing molecular glues remains challenging, requiring innovative mechanistic strategies to stabilize neoprotein interfaces and expedite discovery. Here we unveil a trans-labeling covalent molecular glue mechanism, termed ‘template-assisted covalent modification’. We identified a new series of BRD4 molecular glue degraders that recruit CUL4DCAF16 ligase to the second bromodomain of BRD4 (BRD4BD2). Through comprehensive biochemical, structural and mutagenesis analyses, we elucidated how pre-existing structural complementarity between DCAF16 and BRD4BD2 serves as a template to optimally orient the degrader for covalent modification of DCAF16Cys58. This process stabilizes the formation of BRD4–degrader–DCAF16 ternary complex and facilitates BRD4 degradation. Supporting generalizability, we found that a subset of degraders also induces GAK–BRD4BD2 interaction through trans-labeling of GAK. Together, our work establishes ‘template-assisted covalent modification’ as a mechanism for covalent molecular glues, which opens a new path to proximity-driven pharmacology.



Redirecting the pioneering function of FOXA1 with covalent small molecules

Sang Joon Won, Yuxiang Zhang, Christopher J. Reinhardt,Lauren M. Hargis, Nicole S. MacRae,Kristen E. DeMeester,Evert Njomen,Jarrett R. Remsb...