GPCR:G Protein Complex Nanobodies for Active-State Stabilization
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Solution Overview
Problem
Current drug discovery efforts for G protein-coupled receptors (GPCRs) face challenges due to the instability of the active state and the need for specific stabilizing nanobodies, which are time-consuming and costly, and there is a lack of tools for structural and pharmacological analysis of GPCR drug targets.
Innovation Solution
Development of nanobodies that bind specifically to the G protein in the GPCR:G protein complex, stabilizing the active conformation and allowing for the capture, purification, and crystallization of these complexes, facilitating structure-based drug screening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional small molecule ligands are used for drug discovery, then active-site therapeutics can be identified, but the success rate is low due to target instability and conformational issues
Solution Approach 1:
The patent introduces stabilizing nanobodies as intermediary molecules that bind to GPCRs and lock them in active conformations. These nanobodies act as mediators between the GPCR and the drug discovery process, enabling the receptor to maintain a stable active state that can then be targeted by small molecule ligands. This resolves the contradiction by providing the necessary stability through an intermediary component rather than relying on the intrinsic stability of the GPCR alone.
Solution Approach 2:
The patent applies preliminary action by pre-stabilizing the GPCR in its active conformation using nanobodies before introducing drug candidates. This preliminary stabilization ensures that the target is in the correct conformational state for drug binding, preventing the common problem where targets are abandoned due to conformational instability during screening.
2Stability of the object's composition
If stabilizing nanobodies are developed for each GPCR, then active state stability is improved, but the process becomes time-consuming and costly
Solution Approach 1:
The patent identifies and utilizes conserved conformational epitopes that are common across multiple GPCR families. By developing nanobodies that target these universal epitopes rather than GPCR-specific regions, a single nanobody can stabilize multiple different GPCRs in their active states. This universality approach reduces the time and cost burden by eliminating the need to develop separate nanobodies for each individual GPCR target.
3Stability of the object's composition
If stabilizing nanobodies are developed for each GPCR, then active state stability is improved, but development costs increase
Solution Approach 1:
The patent employs universality by creating nanobodies that can stabilize multiple GPCR targets with a single development effort. This multi-functional nanobody approach significantly reduces development costs compared to creating separate nanobodies for each GPCR, as the same nanobody can be used across multiple drug discovery programs targeting different receptors within the same or related families.
Solution Approach 2:
The patent changes the binding parameter from GPCR-specific epitopes to conserved conformational epitopes that are shared across GPCR families. This parameter change in binding specificity allows a single nanobody to bind and stabilize multiple different GPCRs, thereby reducing the overall cost and complexity of nanobody development while maintaining effective stabilization of the active state.
Data Source
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AI summary
The present invention relates to the field of G protein coupled receptor (GPCR) structural biology and signaling. In particular, the present invention relates to binding domains directed against and/or specifically binding to GPCR:G protein complexes. Also provided are nucleic acid sequences encoding such binding domains and cells expressing or capable of expressing such binding domains. The binding domains of the present invention can be used as universal tools for the structural and functional characterization of G-protein coupled receptors in complex with downstream heterotrimeric G proteins and bound to various natural or synthetic ligands, for investigating the dynamic features of G protein activation, as well as for screening and drug discovery efforts that make use of GPCR:G protein complexes.