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Preliminary crystallographic data for glycolate oxidase from spinach
The Journal of Biological Chemistry
|August 10, 1979
Summary
Spinach glycolate oxidase, crucial for plant photorespiration, was crystallized into two forms. These crystals, characterized by distinct space groups and unit cell dimensions, will aid further structural analysis of this important enzyme.
Area of Science:
- Biochemistry
- Plant Physiology
- Structural Biology
Background:
- Glycolate oxidase is a key enzyme in plant photorespiration.
- Understanding its structure is vital for elucidating its function.
Purpose of the Study:
- To purify and crystallize spinach glycolate oxidase.
- To characterize the resulting crystal forms for future structural studies.
Main Methods:
- Enzyme purification from spinach.
- Crystallization using tertiary butanol and ammonium sulfate.
- X-ray diffraction analysis to determine crystal space groups and unit cell dimensions.
- Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) for molecular weight determination.
Main Results:
- Two distinct tetragonal crystal forms (Form A and Form B) of glycolate oxidase were obtained.
- Form A (space group I 422) and Form B (space group P42212) exhibit different unit cell dimensions.
- SDS-PAGE indicated the enzyme consists of subunits with a molecular weight of 37,000.
- The enzyme's asymmetric units contain at least two subunits.
Conclusions:
- Spinach glycolate oxidase can be crystallized in multiple forms suitable for high-resolution diffraction.
- These crystal forms provide a basis for detailed structural investigations of glycolate oxidase.
- The subunit composition and molecular weight were determined.