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Crystallization and preliminary crystallographic analysis of monodehydroascorbate radical reductase from cucumber
Satoshi Sano1, You-Na Kang, Hiroko Shigemizu
1Laboratory of Chemistry of Biological Function, Graduate School of Agriculture, Kyoto Prefectural University, Shimogamo, Sakyo, 606-8522, Japan.
Summary
Monodehydroascorbate (MDA) radical reductase, an FAD enzyme, was crystallized from cucumber. This structural study provides insights into the enzyme
Area of Science:
- Biochemistry
- Enzymology
- Structural Biology
Background:
- Monodehydroascorbate (MDA) radical reductase (EC 1.6.5.4) is a crucial FAD-dependent enzyme.
- It catalyzes the reduction of MDA radical to ascorbate, utilizing NAD(P)H as an electron donor.
- Understanding its structure is key to elucidating its catalytic mechanism.
Purpose of the Study:
- To obtain crystals of recombinant cucumber MDA reductase for structural analysis.
- To determine the crystallographic parameters and space group of the enzyme.
- To facilitate future high-resolution structural studies of MDA reductase.
Main Methods:
- Recombinant cucumber MDA reductase was purified and crystallized.
- Polyethylene glycol 6000 was used as a precipitant.
- X-ray diffraction data were collected to 2.4 A resolution at 100 K.
Main Results:
- Crystals belonged to space group P2(1) with specific unit-cell parameters.
- The asymmetric unit contained two enzyme molecules.
- The Matthews coefficient and solvent content were determined to be 2.46 A3 Da(-1) and 50.0%, respectively.
Conclusions:
- The crystallization of cucumber MDA reductase provides a foundation for detailed structural investigations.
- These findings enable further studies into the enzyme's active site and catalytic mechanism.
- This work contributes to the understanding of ascorbate regeneration pathways in plants.