Chimeric GPCR Stabilization for Ligand Screening
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Solution Overview
Problem
Current methods for screening compounds targeting GPCRs face challenges in maintaining the correct conformation of GPCRs when expressed outside their native environment, leading to difficulties in ensuring the GPCR is in a functional or active state suitable for screening, and require conformation-specific VHHs which can be limiting.
Innovation Solution
The development of chimeric proteins combining extracellular loops from one GPCR with intracellular loops from another, along with specific binding domains, to stabilize and modulate the conformation of GPCRs for screening and drug discovery, avoiding the need for conformation-specific VHHs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If GPCRs are expressed outside their native environment for screening, then screening can be performed, but the correct conformation and functional state of GPCRs cannot be maintained
Solution Approach 1:
The patent introduces chimeric proteins as intermediary molecules that contain conformation-specific binding domains. These chimeric proteins act as mediators between the screening system and the GPCR, providing a reliable method to detect and maintain correct GPCR conformations during screening outside the native environment. The binding domains specifically recognize and bind to particular conformational states, ensuring reliability in conformation detection.
2Reliability
If conformation-specific VHHs are used to maintain GPCR conformation, then GPCR functional state can be stabilized, but the method becomes limiting and complex
Solution Approach 1:
The patent creates chimeric proteins with universal applicability across different GPCR targets. The binding domains in these chimeric proteins can recognize multiple conformational states of different GPCRs, making the screening system universally applicable rather than requiring target-specific VHHs for each GPCR. This multi-functionality reduces overall system complexity while maintaining conformational stability.
Solution Approach 2:
The patent merges the binding domain functionality into chimeric protein structures that combine multiple functional elements. By integrating conformation recognition, stabilization, and detection capabilities into unified chimeric protein molecules, the system reduces complexity compared to using separate VHH components for each conformational state.
3Device complexity
If traditional screening methods are used without chimeric proteins, then the process is simpler, but the ability to identify compounds that modulate specific GPCR conformations is reduced
Solution Approach 1:
The patent applies local quality by designing chimeric proteins with binding domains that specifically recognize particular conformational states at specific locations on the GPCR structure. This localized conformation recognition enables precise detection and selection of compounds that modulate specific conformations, rather than general binding detection. The binding domains are positioned and structured to interact with specific conformational features.
Data Source
AI summary
The invention relates to chimeric GPCRs having extracellular loops from a first GPCR and intracellular loops from a second GPCR, and to screening methods for identifying compounds or ligands that bind to an active conformation of a GPCR in which such chimeric GPCRs are used.