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Crystallization of alpha 1-acid glycoprotein
Biochemical and Biophysical Research Communications
|October 30, 1984
Summary
Researchers reproducibly crystallized alpha 1-acid glycoprotein using chlorpromazine. The resulting large hexagonal crystals exhibited high hydration and low-resolution diffraction, indicating significant disorder.
Area of Science:
- Biochemistry
- Crystallography
Background:
- Alpha 1-acid glycoprotein (AAG) is a major human plasma protein.
- Understanding AAG's structure is crucial for its biological functions.
Purpose of the Study:
- To develop reproducible crystallization methods for AAG.
- To characterize the structural properties of AAG crystals.
Main Methods:
- Protein delipidation and crystallization in the presence of chlorpromazine.
- X-ray diffraction analysis to determine crystal space group and unit cell dimensions.
Main Results:
- Reproducible growth of large hexagonal prism crystals of AAG.
- Space group P622 or P6(2)22 with unit cell dimensions a=b=101 Å, C=201 Å.
- Crystals are highly hydrated (~80% solvent) and diffract to low resolution.
Conclusions:
- Chlorpromazine facilitates reproducible crystallization of AAG.
- High solvent content likely contributes to crystal disorder and low-resolution diffraction.