Soaking Solution for Macromolecular Crystal Screening
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Solution Overview
Problem
Traditional methods for identifying new drug motifs in drug discovery face challenges due to the vast size of chemical libraries and the sensitivity required for detecting weak interactions between small molecules and biological macromolecules, often resulting in low hit rates and crystal quality issues when using high concentrations of organic solvents and cryoprotectants.
Innovation Solution
A systematic and rule-based method for selecting soaking solution compositions that balance organic solvents, compatible solutes, and crystallization solutions to maintain crystal quality and stability, allowing for higher organic solvent concentrations and extended soaking times, and eliminating the need for distinct soaking and cryo-preservation steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high concentrations of organic solvents and cryoprotectants are used in soaking solutions, then small molecule binding detection capability is improved, but crystal quality deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying the concentration ratios of organic solvents, compatible solutes, and crystallization solutions in the soaking solutions. This allows optimization of the balance between achieving sufficient small molecule binding (improved detection capability) and maintaining crystal integrity (preserved crystal quality), resolving the contradiction between measurement precision and stability.
Solution Approach 2:
The patent employs composite materials by combining multiple components (organic solvents, compatible solutes, crystallization solutions) in specific proportions within the soaking solution. This composite approach enables the simultaneous achievement of high small molecule binding detection capability and crystal quality maintenance, as each component contributes different functional properties that compensate for potential detrimental effects.
2Stability of the object's composition
If distinct soaking and cryo-preservation steps are used, then crystal stability is maintained, but screening efficiency is reduced
Solution Approach 1:
The patent merges the soaking and cryo-preservation steps into a single integrated process. By formulating the soaking solution to simultaneously provide both small molecule binding conditions and cryoprotective features, the patent eliminates the need for separate steps, thereby maintaining crystal stability while significantly improving screening efficiency.
Solution Approach 2:
The patent applies universality by designing the soaking solution to perform multiple functions simultaneously: it serves as both the medium for small molecule binding and the cryoprotective solution for maintaining crystal stability during freezing. This multi-functional approach resolves the contradiction between crystal stability and screening efficiency by consolidating previously separate requirements into a single solution formulation.
3Measurement precision
If extended soaking times are used, then small molecule binding is improved, but crystal quality deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the soaking time parameter in conjunction with the solution composition. By systematically varying both time and compositional parameters, the patent identifies optimal conditions that maximize small molecule binding while minimizing crystal quality degradation, resolving the contradiction between improved binding and maintained crystal integrity.
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
This approach improves crystal quality and hit rates by stabilizing biological macromolecular crystals, enabling more flexible and efficient small molecule screening processes, even for 'undruggable' targets, and allows for the use of soaking solutions across multiple protein species.
Implementation Method 1
During the soaking, the small molecules, which include molecular probes, fragments and drug-size molecules, will diffuse into the biological macromolecular crystal and will bind to the binding sites of the biological macromolecule
Implementation Method 2
compatible solutes (osmolytes having cryoprotective properties) have a disadvantageous effect on the crystals. Notably, crystallographic measurements are either conducted at cryogenic temperatures such as at 100 K or less
Data Source
AI summary
Subject-matter of the present invention is an array comprising soaking solutions for soaking a biological macromolecular crystal. Further, the subject of the invention is a rule-based method of selecting specific soaking solution compositions having a specific composition comprising composite solute(s), water (w), crystallization solution (crs) and/or organic solvent(s). Additionally, the subjects matter of the invention the soaking solutions obtained by the method of the invention and a screening method for small molecules comprising molecular probes, fragments and drug-size molecules using the soaking solutions and the use of the soaking solutions in a screening method for small molecules on a macromolecular crystal.