Lyophilized Detergent-Solubilized GPCR Powder for Long-Term Storage
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Solution Overview
Problem
Current methods for preserving G-protein coupled receptors (GPCRs) are inadequate due to their low natural abundance and difficulty in stabilizing them in detergent solutions, leading to challenges in structural studies and drug development, as they require milligram quantities and are prone to denaturation when water is removed.
Innovation Solution
A method for stabilizing detergent-solubilized GPCRs in a powdered form that is substantially devoid of water, allowing storage at -20°C for 365 days or longer without loss of photochemical functionality upon rehydration, involving a minimal detergent-to-protein ratio and the option to replace hydrogen atoms with deuterons for specific experiments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detergent-solubilized GPCRs are preserved in liquid form, then photochemical functionality is maintained, but long-term storage is difficult and protein denaturation occurs over time
Solution Approach 1:
The patent applies freeze-drying (lyophilization) to transform detergent-solubilized GPCRs from liquid solution to solid powder form. This phase transition enables long-term storage at -20°C while preserving photochemical functionality, as the dried powder can be stored for extended periods without denaturation, and functionality is restored upon rehydration
Solution Approach 2:
The patent optimizes the detergent-to-protein molar ratio parameter to maintain stability during freeze-drying. By carefully controlling this parameter and using specific detergents (nonionic, anionic, cationic, or zwitterionic), the protein maintains its functional conformation in the dried state, resolving the contradiction between storage duration and functionality preservation
2Duration of action of stationary object
If water is removed from detergent-solubilized GPCRs to enable long-term storage, then storage stability improves, but protein denaturation occurs
Solution Approach 1:
The patent uses detergents as intermediary molecules that solubilize the hydrophobic GPCR protein and maintain its structural integrity during freeze-drying. The detergent molecules surround the protein, preventing aggregation and denaturation when water is removed, thus enabling long-term storage while preserving functionality
Solution Approach 2:
The patent creates a composite material system consisting of GPCR protein, detergent molecules, and frozen water matrix. This composite structure, when freeze-dried, maintains protein stability in the dry state. The combination of these components resolves the contradiction between water removal for storage and prevention of denaturation
3Quantity of substance
If milligram quantities of purified membrane protein are produced for structural studies, then structural analysis becomes possible, but production in heterologous systems becomes extremely difficult
Solution Approach 1:
The patent performs preliminary purification of GPCRs from natural sources (such as bovine retina for rhodopsin) before freeze-drying. This preliminary action obtains sufficient quantities of pure protein without requiring complex heterologous expression systems, thus enabling structural studies while avoiding production difficulties
Solution Approach 2:
The patent extracts GPCRs from their natural membrane environment using detergent solubilization, separating them from complex biological matrices. This extraction process obtains purified protein in sufficient quantities for structural studies without requiring difficult heterologous production systems
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
Enables long-term storage and efficient production of GPCRs with retained functionality, facilitating large-scale drug discovery and experimental procedures like mass spectrometry and neutron scattering, without the need for stabilizing lipid-like substances or site-directed mutagenesis.
Implementation Method 1
adding the amphiphilic protein to the detergent solvent, wherein a hydrophobic component of the detergent interacts with a hydrophobic component of the amphiphilic protein, and wherein a hydrophilic component of the detergent interacts with a hydrophilic component of the amphiphilic protein, thereby forming a detergent-solubilized protein
Implementation Method 2
separating the detergent-solubilized protein from the remaining detergent solvent to form a detergent-solubilized protein concentrate
Implementation Method 3
lyophilizing the detergent-solubilized protein concentrate to form a detergent-protein powder
Data Source
AI summary
A method for generating detergent-solubilized G-protein coupled receptors (GPCRs) in powdered form. The powdered GPCRs is storable at temperatures of −20° C. or lower and for durations of 365 days or longer without substantial loss of functionality of the GPCRs after rehydration as compared to a pre-frozen state. The method can maintain minimal detergent to protein ratio in molar concentrations. The method can further generate GPCRs with specific water or deuterium content as required in certain experiments, such as mass spectrometry, NMR spectroscopy, or quasi-elastic neutron scattering (QENS).