Bifunctional Ligands for Induced Protein-Protein Binding Potency
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Solution Overview
Problem
Existing drug design methods struggle with targeting proteins lacking deep binding pockets, such as receptor and scaffolding proteins, making them undruggable, and there is a need for compounds that can induce protein-protein interactions to enhance ligand potency.
Innovation Solution
A ligand molecule with a specific chemical structure (WA-C-WB) that binds to two proteins simultaneously, forming a transient or stable complex, providing additional stabilization energy through protein-protein interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional small molecule compounds are designed to bind to proteins, then binding affinity is improved for proteins with deep binding pockets, but proteins lacking deep binding pockets (receptor proteins, scaffolding proteins) remain undruggable
Solution Approach 1:
The patent merges two separate binding events into a single ligand molecule. The bivalent ligand simultaneously binds to two protein molecules (or two sites on the same protein), combining the binding energies of both interactions to achieve high overall affinity for targets that individually would have weak binding
Solution Approach 2:
The patent transitions from considering single protein-ligand binding events to analyzing ternary complexes involving two proteins and one ligand. This dimensional shift allows exploitation of protein-protein interaction surfaces in addition to individual protein binding sites, enabling drug design for previously undruggable targets
2Reliability
If one ligand molecule targets two protein molecules simultaneously to induce protein-protein interaction, then binding potency is significantly enhanced, but the design complexity and optimization difficulty increase
Solution Approach 1:
The patent segments the ligand into distinct functional modules: two binding domains (each targeting a specific protein or site) connected by a linker. This modular architecture simplifies the design process by allowing independent optimization of each binding domain while maintaining the ability to achieve high overall potency through their cooperative action
Solution Approach 2:
The linker serves as an intermediary element that connects the two binding domains. It provides the necessary spatial separation and flexibility to allow both binding domains to simultaneously engage their respective protein targets while maintaining optimal geometry for protein-protein interaction induction
Data Source
AI summary
The present disclosure is based on the surprising and unexpected discovery that a ligand molecule with certain characteristics is able to bind to two protein molecules simultaneously and recruit them to form a transient or stable protein-protein interaction complex. The protein-protein interaction and other cross-domain interactions gained in this process contribute additional stabilization energy to the complex beyond the combination of the binary binding energies, and therefore, largely increase the binding potency of the ligand. Accordingly, the present disclosure provides a Protein-Protein Interaction Inducing Technology (PPIIT), which includes a method to design and identify the tripartite or bifunctional compounds and use such compounds to induce protein-protein interactions in various contexts. The present disclosure also provides a composition for the purpose of inducing protein-protein interactions.