Patterned Film Crystallization Plates for Protein Crystal Screening
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Solution Overview
Problem
Current high-throughput protein crystallization plates face challenges such as inferior crystal quality due to the sitting drop method, difficult crystal retrieval, irregular drop shapes and positions, and lack of X-ray transparency, which hinder efficient screening and throughput in structural genomics efforts.
Innovation Solution
The development of crystallization plates with open cells sealed by thin, X-ray transparent films that are chemically or topographically patterned to pin drop contact lines, allowing for reproducible drop positions and shapes, and enabling in situ X-ray examination of crystal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sitting drop method is used in current high-throughput crystallization plates, then high-throughput screening is enabled, but crystal quality deteriorates and retrieval becomes difficult
Solution Approach 1:
The invention inverts the traditional sitting drop approach by using hanging drop configuration where the drop is suspended from the bottom of the well. This inversion allows crystals to grow in a orientation that facilitates easier retrieval while maintaining high-throughput capability. The drop hangs from a supports structure at the bottom of the well, and crystals can be accessed by removing the support structure without damaging the crystal.
Solution Approach 2:
The invention segments the crystallization system into separate functional components: a supports structure that can be removed independently from the well plate. This segmentation allows the supports structure (holding the drop and crystals) to be detached and transferred to a mounting device for X-ray analysis, while the well plate remains in the high-throughput screening system. This resolves the contradiction by enabling both high-throughput screening and easy crystal retrieval.
2Productivity
If conventional crystallization plates are used, then high-throughput screening is achieved, but X-ray transparency is lost and in situ examination is hindered
Solution Approach 1:
The invention replaces conventional thick plastic well plates with thin film structures that are X-ray transparent. The drop is contained within a thin film enclosure that allows X-rays to pass through for in situ diffraction studies. This thin film design maintains the high-throughput screening capability while enabling direct X-ray examination of crystals without requiring removal from the plate.
Solution Approach 2:
The invention introduces an intermediary mounting device that interfaces between the high-throughput plate system and the X-ray diffraction system. The supports structure acts as an intermediary component that can be transferred from the screening plate to the mounting device, enabling X-ray analysis while maintaining compatibility with both high-throughput screening and single-crystal diffraction methodologies.
3Ease of manufacture
If regular substrates are used without patterning, then manufacturing is simple, but drop positions and shapes become irregular
Solution Approach 1:
The invention applies local quality by creating hydrophilic patterned regions on the substrate surface where drops are dispensed. These patterned regions have different surface properties (hydrophilic) compared to the surrounding hydrophobic substrate, causing drops to conform to the patterned geometry. This local modification of surface properties ensures reproducible drop positions and shapes while maintaining overall manufacturing simplicity through standard photolithographic patterning techniques.
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 solution improves crystal reproducibility, simplifies retrieval, and enhances screening efficiency by allowing in situ X-ray evaluation, reducing costs and increasing throughput in protein crystal growth processes.
Implementation Method 1
Both films can be X-ray transparent, allowing in situ X-ray examination of crystal quality
Implementation Method 2
One of the films is preferably chemically or topographically patterned to strongly pin the contact lines of drops dispensed onto it at particular positions
Implementation Method 3
Vapor diffusion is the most common method for growing crystals of proteins, viruses and biomolecular assemblies... water is removed from the drop as it equilibrates with the reservoir solution
Implementation Method 4
a reservoir (52) containing a solution (53) with a lower initial vapor pressure than that of the drop (achieved, e.g., by having a higher salt concentration or by adding polyethylene glycols)
Data Source
AI summary
In one embodiment, a crystallization and screening plate comprises a plurality of cells open at a top and a bottom, a frame that defines the cells in the plate, and at least two films. The first film seals a top of the plate and the second film seals a bottom of the plate. At least one of the films is patterned to strongly pin the contact lines of drops dispensed onto it, fixing their position and shape. The present invention also includes methods and other devices for manual and high-throughput protein crystal growth.