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Crystallization and preliminary characterization of dihydropteridine reductase from Dictyostelium discoideum.

Acta Crystallogr. Sect. F Struct. Biol. Cryst. Commun.2008 Nov 01;64(Pt 11):1013-5. Epub 2008 Oct 25
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摘要


Dihydropteridine reductase from Dictyostelium discoideum (dicDHPR) can produce D-threo-BH(4) [6R-(1'R,2'R)-5,6,7,8-tetrahydrobiopterin], a stereoisomer of L-erythro-BH(4), in the last step of tetrahydrobiopterin (BH(4)) recycling. In this reaction, DHPR uses NADH as a cofactor to reduce quinonoid dihydrobiopterin back to BH(4). To date, the enzyme has been purified to homogeneity from many sources. In this report, the dicDHPR-NAD complex has been crystallized using the hanging-drop vapour-diffusion method with PEG 3350 as a precipitant. Rectangular-shaped crystals were obtained. Crystals grew to maximum dimensions of 0.4 x 0.6 x 0.1 mm. The crystal belonged to space group P2(1), with unit-cell parameters a = 49.81, b = 129.90, c = 78.76 A, beta = 100.00 degrees , and contained four molecules in the asymmetric unit, forming two closely interacting dicDHPR-NAD dimers. Diffraction data were collected to 2.16 A resolution using synchrotron radiation. The crystal structure has been determined using the molecular-replacement method.

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