Nano Seeding Tools for Protein Crystallization
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Solution Overview
Problem
Crystallization of protein targets remains the most significant bottleneck in X-ray crystallography, as existing seeding techniques struggle to effectively utilize nanocrystals and distinguish between protein and salt sources, leading to inefficient crystal growth and low-quality crystals.
Innovation Solution
A method involving sub-millimeter sized glass beads is used to grind and quantify nanometer-sized protein nanocrystals, generating high-quality nanoseeds that can produce larger, homogeneous crystals through controlled agitation and microscopy-based selection, allowing for the identification and optimization of previously unusable crystallization drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional microseeding techniques are used, then crystal growth can be facilitated, but the ability to distinguish between protein and salt sources is poor, leading to low-quality crystals
Solution Approach 1:
The invention segments the seed material into nanometer-sized crystals through mechanical crushing using beads, creating discrete nanoseeds that can be individually handled and applied. This segmentation enables precise control over seeding while maintaining the ability to distinguish protein sources through their unique diffraction patterns, resolving the contradiction between crystal quality and source differentiation.
Solution Approach 2:
The invention changes the size parameter of the seeds from micrometer scale to nanometer scale, fundamentally altering the seeding mechanism. This parameter change enables the use of nanocrystal diffraction patterns for source identification while simultaneously improving crystal quality through controlled nanoseed application, addressing both aspects of the technical contradiction.
2Productivity
If nanocrystals are used for seeding, then crystal growth can be initiated, but the crystals are too small to be effectively utilized for traditional X-ray crystallography
Solution Approach 1:
The invention performs preliminary mechanical crushing of microcrystals into nanocrystals before the actual seeding process. This preliminary action creates the nanoseeds needed for efficient crystal growth initiation, while the nanocrystals are subsequently used to grow larger crystals suitable for X-ray analysis, resolving the size contradiction.
Solution Approach 2:
The nanocrystals serve as an intermediary form between the original microcrystals and the final X-ray suitable crystals. They mediate the transformation by providing high surface area to volume ratio for efficient growth while being small enough to be handled and applied precisely, enabling both high productivity and sufficient final crystal size.
3Manufacturing precision
If mechanical crushing is applied to nanocrystals, then nanometer size seeds can be generated, but the process complexity increases
Solution Approach 1:
The invention uses disposable glass or stainless steel beads as the crushing medium. These simple, inexpensive beads perform the mechanical crushing function effectively and can be easily discarded after use, avoiding the need for complex, expensive, or difficult-to-maintain crushing devices while achieving precise nanometer size seed generation.
4Manufacturing precision
If traditional seeding methods are used, then crystal growth can be achieved, but the time required for crystal-to-structure determination remains excessive
Solution Approach 1:
The invention performs preliminary preparation of nanoseeds from microcrystals before the main crystal growth experiment. This preliminary action pre-processes the seeding material into the optimal nanometer size range, eliminating the need for time-consuming trial-and-error seeding during the main experiment and significantly reducing the overall crystal-to-structure determination time while maintaining high crystal quality.
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 significantly improves crystal quality and size, enabling the growth of high-quality protein crystals from previously unusable nanocrystals, as demonstrated by X-ray diffraction data and TEM imaging, and facilitates the generation of crystal catalogues for advanced X-ray free electron laser applications.
Implementation Method 1
contacting a plurality of beads with an aggregate comprising at least one first protein nanocrystal to form a mixture, and agitating the mixture to produce a nanoseed
Implementation Method 2
A method involving sub-millimeter sized glass beads is used to grind and quantify nanometer-sized protein nanocrystals
Implementation Method 3
uses microseeds from a nucleation step to facilitate growth of crystals in other conditions
Implementation Method 4
crystallization of protein targets remains the most significant bottleneck in structure determination by X-ray crystallography
Data Source
AI summary
A kit and a method for using the kit to generate nanoseeds from protein nanocrystals and aggregates is disclosed. The method comprises mixing a plurality of beads with a protein nanocrystal or aggregate, and agitating the mixture to generate the nanoseeds. Nanoseeds made by disclosed embodiments may be of a high quality, as evaluated by TEM, and can be used to produce high quality protein crystals. Additionally, spectroscopic techniques, such as UV fluorescence and/or brightfield microscopy can be used to identify aggregates suitable to produce nanoseeds.