Towards automated screening of two-dimensional crystals

Area of Science:

• Structural biology
• Biophysics
• Materials science

Background:

• Screening for two-dimensional (2D) protein crystals is essential for 3D structure determination via electron crystallography.
• This screening process is traditionally very labor-intensive and time-consuming.

Purpose of the Study:

• To develop and evaluate automated methods for screening protein crystallization trials.
• To assess the feasibility of a fully automated workflow for producing and analyzing protein crystal grids.

Main Methods:

• Development of methods for automated crystal production via dialysis.
• Implementation of robotic handling for electron microscopy (EM) grids.
• Semi-automated transmission electron microscopic imaging and evaluation of trial grids.

Main Results:

• Working prototypes for automated screening tools have been developed and tested.
• A simple screen of 24 crystallization conditions demonstrated the potential of these automated methods.
• The developed tools show promise for streamlining the labor-intensive screening process.

Conclusions:

• Fully automated screening of protein crystals for electron crystallography is achievable.
• Further development is needed to create a turn-key system, but the goal is within reach.
• Automation significantly enhances the efficiency of crystal screening for structural studies.