BromoTag Bivalent Molecules for Rapid Protein Dimerization
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Solution Overview
Problem
Existing methods for inducing protein-protein interactions within cells are limited in their ability to efficiently stimulate formation of protein homodimers or heterodimers for studying signal transduction and protein subcellular localization.
Innovation Solution
Development of bivalent molecules that utilize a 'bump and hole' ligand to bind to the BRD4 BD2 L387A mutant tag (BromoTag) for stimulating protein homodimers or heterodimers, using compounds of formula (I) with moieties that bind to BRD4 BD2-domain and FKBP12, linked by various moieties to facilitate dimerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods for inducing protein-protein interactions are used, then protein interactions can be studied, but the efficiency of stimulating formation of protein homodimers or heterodimers is limited
Solution Approach 1:
The bivalent molecule is segmented into two independent binding moieties: one that binds to BRD4 BD2-domain (L387A mutant tag) and another that binds to FKBP12. This segmentation allows the molecule to simultaneously recruit different protein partners, enabling efficient formation of both homodimers (when both moieties bind BRD4 tags) and heterodimers (when one moiety binds BRD4 and the other binds FKBP12), thereby resolving the contradiction between productivity and reliability of protein interaction induction
Solution Approach 2:
The bivalent molecule acts as an intermediary agent that mediates protein-protein interactions. It contains a linker connecting two binding moieties, where one moiety interacts with BRD4 BD2-domain and the other with FKBP12. This intermediary structure enables controlled and efficient dimerization by bringing protein partners into proximity through chemical binding, significantly improving both the efficiency and reliability of protein interaction studies
2Adaptability or versatility
If bivalent molecules with specific binding moieties are designed, then protein dimerization can be stimulated, but the molecular structure and linkage options become complex
Solution Approach 1:
The bivalent molecule is designed with universal functionality to accommodate multiple protein partners. The first binding moiety universally binds to BRD4 BD2-domain (L387A mutant tag), while the second binding moiety binds to FKBP12. This multi-functional design allows the same bivalent molecule structure to induce both homodimers (BRD4-BRD4) and heterodimers (BRD4-FKBP12) by simply changing the protein partners, thereby achieving high adaptability without proportionally increasing structural complexity
Solution Approach 2:
The versatility of the bivalent molecule is achieved through parameter changes in the binding moieties rather than fundamental structural changes. By modifying the chemical groups at the ends of the linker (e.g., changing from BRD4-only binding to BRD4-FKBP12 binding), the molecule can switch between inducing homodimers and heterodimers. This approach maintains relatively simple molecular structure while achieving high adaptability through chemical parameter variation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The compounds effectively stimulate the formation of protein homodimers or heterodimers, enabling the study of protein-protein interactions and altering signal transduction and protein subcellular localization in cells.
Implementation Method 1
a series of bivalent molecules that rely on a 'bump and hole' ligand to bind to the BRD4 BD2 L387A mutant tag ('BromoTag')
Data Source
AI summary
Disclosed herein are compounds that stimulate formation of protein homodimers or heterodimers, which can be used for the study of protein-protein interactions.