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Crystallization and preliminary X-ray diffraction analysis of monkey dimeric dihydrodiol dehydrogenase
Ossama El-Kabbani1, Roland P T Chung, Paul A Ramsland
1Department of Medicinal Chemistry, Victorian College of Pharmacy, Monash University (Parkville Campus), Parkville, Victoria 3052, Australia. ossama.el-kabbani@vcp.monash.edu.au
Acta Crystallographica. Section D, Biological Crystallography
|December 26, 2001
Summary
Researchers crystallized a novel dimeric dihydrodiol dehydrogenase from monkey kidneys. This enzyme, distinct from other mammalian forms, may represent a new protein family, aiding future structural and functional studies.
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- Dihydrodiol dehydrogenase (DDH) catalyzes the oxidation of aromatic hydrocarbon trans-dihydrodiols to catechols using NADP+.
- Mammalian tissues contain multiple forms of DDH, with varying primary structures.
- A dimeric form of mammalian DDH presents a distinct primary structure, potentially indicating a novel protein family related to prokaryotic enzymes.
Purpose of the Study:
- To characterize the dimeric dihydrodiol dehydrogenase from monkey kidney.
- To determine the crystal structure of this enzyme for further structural and functional analysis.
Main Methods:
- Crystallization of monkey kidney dimeric dihydrodiol dehydrogenase using the hanging-drop vapor-diffusion method with buffered ammonium phosphate.
- X-ray diffraction analysis of the obtained crystals.
Main Results:
- Crystals of monkey kidney dimeric dihydrodiol dehydrogenase were successfully obtained.
- The crystals diffracted X-rays to a resolution of 2.65 Å.
- The crystal lattice belongs to the hexagonal P6(1)22 or P6(5)22 space group.
- Unit-cell parameters were determined as a = b = 122.8 Å, c = 121.3 Å, with angles α = β = 90° and γ = 120°.
Conclusions:
- The dimeric dihydrodiol dehydrogenase from monkey kidney has been crystallized and its unit-cell parameters determined.
- These findings provide a foundation for future X-ray crystallographic studies to elucidate the enzyme's three-dimensional structure.
- The distinct structure suggests DDH may represent a novel protein family, expanding our understanding of mammalian enzymes.