Polymer Fixed Targets for Hydrated Serial X-Ray Crystallography
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Solution Overview
Problem
Delivering micro-crystal samples efficiently and effectively to an XFEL beam for high-throughput serial femtosecond crystallography is challenging due to issues with crystal damage, sample consumption, and low data collection efficiency in existing delivery methods, such as fixed targets and liquid jets.
Innovation Solution
Development of functionalized polymer-based chips that maintain protein crystal hydration, allow on-chip crystallization, and minimize background scattering, enabling rapid prototyping and easy sample loading, suitable for both synchrotron and XFEL sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fixed targets or liquid jets are used to deliver micro-crystals to XFEL beam, then crystal diffraction data can be collected, but crystal damage occurs and sample consumption is high
Solution Approach 1:
The invention divides the crystal delivery system into discrete, addressable locations on a 2D polymer chip. Each location can hold individual crystals or crystal suspensions, allowing selective delivery to the XFEL beam. This segmentation enables precise control over which crystals are exposed, reducing unnecessary sample consumption while maintaining high data collection efficiency through systematic screening of multiple locations.
Solution Approach 2:
Crystals are pre-loaded onto the polymer chip at defined locations before XFEL exposure. The chip allows crystals to be positioned and hydrated in advance, then rapidly delivered to the beamline. This preliminary preparation eliminates the need for continuous crystal generation and delivery, reducing sample consumption while enabling high-throughput data collection across multiple pre-positioned crystals.
2Ease of operation
If conventional fixed targets are used, then sample handling is simplified, but crystal hydration is compromised and background scattering increases
Solution Approach 1:
The invention uses thin polymer films as the substrate for crystal delivery. These flexible, thin-film structures maintain crystal hydration by allowing controlled water permeation while presenting a low-scattering interface to the XFEL beam. The polymer material itself contributes minimal background scattering compared to conventional rigid targets, and the thin-film geometry can be optimized to match the crystal size and beam parameters.
Solution Approach 2:
The polymer chip comprises composite structures combining different polymer layers with specific properties: one layer provides mechanical support and handling stability, while another layer provides low scattering and appropriate water permeability for crystal hydration. This composite approach simultaneously achieves ease of handling and minimal background scattering by assigning different functions to different material components.
3Ease of manufacture
If rapid prototyping and easy sample loading are prioritized, then device complexity increases, but manufacturing precision decreases
Solution Approach 1:
The polymer chip design allows key parameters such as chamber dimensions, window sizes, and crystal well geometries to be adjusted by changing fabrication conditions (e.g., spacer thickness, photomask patterns, curing parameters) rather than redesigning the entire device. This enables rapid prototyping with different configurations while maintaining sufficient manufacturing precision through controlled parameter variation within established fabrication tolerances.
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
The polymer chips facilitate high-throughput serial protein crystallography with minimal crystal consumption, stable sample handling, and efficient data collection, supporting dynamic measurements and remote, automated experiments.
Implementation Method 1
The chamber is bounded by two thin polymer membrane barrier films that maintain water permeability rates that enable crystal hydration
Implementation Method 2
The polymer chip design and thickness is optimized to minimize background by matching the sample thickness in the beam to the crystal size
Implementation Method 3
A plurality of spacers are disposed between the barrier films, the spacers and barrier films defining a chamber volume
Data Source
AI summary
Systems and methods for producing and using polymer based fixed targets for hydrated, room temperature, high-throughput serial protein crystallography with minimal background and minimal sample consumption are provided. The fixed targets can also be used with non-protein samples such as nanoparticle inorganic crystals. The targets maintain full crystal hydration that allows for on-chip crystallization as well as maintaining long term stability of the sample within the chip. The target chips are optimized to minimize background by controlling the sample thickness in the beam to match crystal size, enabling fast raster scanning at lower fidelity and high hit rates that facilitate dynamic measurements. The targets provide an inexpensive, flexible substrate for on-chip, micro-batch or vapor diffusion crystallization facilitated by polymer brushes for sample concentration and surface initiated crystallization thereby eliminating damaging crystal sample transfer.