Bifunctional Molecule Salts Overcome BTK Resistance
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Solution Overview
Problem
Current therapies for B cell malignancies and autoimmune diseases often rely on stoichiometric inhibition of Bruton's tyrosine kinase (BTK), which may not effectively target mutated forms of BTK, such as the C481S mutation conferring resistance to ibrutinib.
Innovation Solution
Development of highly purified and stable forms of bifunctional molecules, specifically salts and polymorph forms of compounds of Formula (I), which can recruit BTK to a ubiquitin ligase for proteolytic degradation, thereby effectively blocking BCR signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stoichiometric inhibition of BTK is used, then BTK kinase activity is blocked, but mutated forms of BTK (e.g., C481S) conferring resistance are not effectively targeted
Solution Approach 1:
Instead of inhibiting BTK kinase activity directly, the invention inverts the approach by recruiting BTK to a ubiquitin ligase complex to promote its degradation. This alternative mechanism targets the protein itself rather than its active site, thereby overcoming resistance caused by mutations that prevent stoichiometric inhibition.
Solution Approach 2:
The invention changes the mechanism parameter from stoichiometric inhibition to proteolytic degradation. By using heterobifunctional small molecules that recruit BTK to ubiquitin ligases, the system achieves degradation of BTK protein, which eliminates both kinase activity and protein interaction functions, including those of mutated forms.
2Stability of the object's composition
If highly purified and stable forms of bifunctional molecules are developed, then manufacturing stability is improved, but manufacturing complexity increases
Solution Approach 1:
The bifunctional molecule is segmented into two distinct functional parts: a BTK-recruiting moiety and a ubiquitin ligase-recruiting moiety. This segmentation allows each part to be optimized independently for stability and activity, while the overall molecule maintains manufacturability through modular design.
Solution Approach 2:
The invention uses composite molecular structure combining two different functional groups in a single heterobifunctional small molecule. This composite approach enables the molecule to perform dual functions (recruiting both BTK and ubiquitin ligase) while maintaining stability and facilitating manufacturing through established chemical synthesis methods.
Data Source
AI summary
The present disclosure is directed to salts and free bases of Compounds of Formula (I), including crystalline, semi-crystalline, amorphous, and polymorph forms thereof, and processes for their preparation.