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Crystals of trp repressor suitable for high-resolution neutron Laue diffraction studies
Brenda V Daniels1, Dean A A Myles, V Trevor Forsyth
1Biology Department, Brookhaven National Laboratory, Upton, NY 11973, USA.
Acta Crystallographica. Section D, Biological Crystallography
|December 25, 2002
Summary
Researchers crystallized the Escherichia coli trp repressor protein variant and used neutron diffraction to study its structure. This study paves the way for understanding solvent interactions in DNA-binding proteins.
Area of Science:
- Structural Biology
- Biophysics
- Molecular Biology
Background:
- The Escherichia coli trp repressor regulates tryptophan biosynthesis.
- Understanding the role of solvent in protein-DNA recognition is crucial for molecular biology.
- Previous structural studies have not fully elucidated solvent interactions.
Purpose of the Study:
- To crystallize the Val58-->Ile variant of the Escherichia coli trp repressor.
- To perform preliminary neutron diffraction measurements on the crystallized protein.
- To enable the development of a full-atom neutron structural model of a DNA-binding protein with associated solvent.
Main Methods:
- Protein crystallization using vapor-diffusion method with small solution volumes (0.2-0.5 ml).
- Growth of cube-shaped crystals (0.8-1.4 mm edge dimensions).
- Neutron Laue diffraction measurements to 2.1 Å resolution using D(2)O-exchanged crystals and the LADI instrument at ILL.
Main Results:
- Successful crystallization of the trp repressor variant.
- Acquisition of preliminary neutron diffraction data.
- Demonstration of the feasibility of obtaining a full-atom neutron structural model of a DNA-binding protein and its solvent.
Conclusions:
- Neutron diffraction provides a novel method for studying protein-solvent interactions.
- Direct observation of hydrogen bonding between protein and solvent is achievable.
- This approach will enhance understanding of solvent's role in protein-DNA recognition.