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Purification and two-dimensional crystallization of highly active cytochrome b(6)f complex from spinach
1Max-Planck-Institute of Biophysics, Department of Structural Biology, Heinrich-Hoffmann-Strasse 7, 60528, Frankfurt am Main, Germany.
FEBS Letters
|December 22, 1999
Summary
Researchers purified highly active spinach cytochrome b(6)f complex, achieving record electron transfer rates. This preparation is ideal for structural studies and yielded promising crystals.
Area of Science:
- Biochemistry
- Structural Biology
- Photosynthesis Research
Background:
- The cytochrome b(6)f complex is crucial for electron transport in photosynthesis.
- Previous studies have faced challenges in obtaining highly active and pure complex for detailed analysis.
Purpose of the Study:
- To purify and characterize highly active spinach cytochrome b(6)f complex.
- To assess its suitability for biophysical and structural investigations.
- To explore crystallization conditions for structural determination.
Main Methods:
- Purification of spinach cytochrome b(6)f complex.
- Spectroscopic characterization to confirm purity and activity.
- Enzyme activity assays using dimethyl sulfoxide (DMSO) as a solvent.
- Preliminary two-dimensional crystallization trials.
Main Results:
- Successfully purified highly active cytochrome b(6)f complex with highest reported in vitro activity (450+/-60 e-/s).
- Spectroscopic analysis confirmed the purity of the complex.
- Enhanced assay performance and reproducibility using DMSO.
- Obtained various forms of two-dimensional and thin three-dimensional crystals.
Conclusions:
- The purified spinach cytochrome b(6)f complex is highly active and pure, suitable for structural studies.
- The use of DMSO improves assay reliability.
- Preliminary crystallization results show potential for obtaining ordered structures.