The MORPHEUS protein crystallization screen.

Area of Science:

• Structural Biology
• Biochemistry
• Crystallography

Background:

• Protein crystallization is crucial for determining biological macromolecule structures.
• Existing screening methods often rely on empirical or previously successful conditions.
• There is a need for innovative and efficient approaches to protein crystallization screening.

Purpose of the Study:

• To develop a novel, de novo designed 96-condition screen for initial protein crystallization.
• To integrate chemically compatible ligand mixes, novel buffer systems, and precipitant/cryoprotectant mixes.
• To create a comprehensive, small, and easy-to-use screening tool.

Main Methods:

• Development of the MORPHEUS (MRC-LMB) screening system.
• Incorporation of chemically compatible ligand mixes based on Protein Data Bank (PDB) co-crystallization data.
• Utilizing novel buffer and precipitant mixes derived from PDB searches and practical laboratory observations.
• Formulation of de novo screening conditions based on chemical behavior and structure.

Main Results:

• The MORPHEUS screen is a 96-condition set designed for initial protein crystallization.
• It integrates innovative approaches including chemically compatible ligand mixes and combined precipitant/cryoprotectant formulations.
• The screen has successfully identified crystallization hits for both known and novel biological samples.
• MORPHEUS has become a standard routine screen at the MRC Laboratory of Molecular Biology (MRC-LMB).

Conclusions:

• The MORPHEUS screen represents a significant advancement in protein crystallization screening.
• Its de novo design, based on PDB data and practical considerations, enhances efficiency and success rates.
• This novel approach facilitates the structure determination of biological macromolecules.