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3 protocols using spinach ferredoxin nadp reductase

1

Biliverdin IXα Extraction and Enzymatic Assays

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Biliverdin IXα was purchased from Frontier Scientific Inc., Logan, UT, spinach ferredoxin-NADP+ reductase, spinach ferredoxin, NADP+, glucose-6-phosphate, and glucose-6-phosphate dehydrogenase were purchased from Sigma-Aldrich. Hemin was obtained from Fluka. Manduca sexta insecticyanin was a gift of Dr. J. Winzerling, University of Arizona. Biliverdin IXγ was obtained by extracting the insecticyanin sample with methanol and removing the precipitated protein by centrifugation. Human factor Xa, prothrombin and thrombin were obtained from Calbiochem. Factor Va was obtained from Haematologic Technologies, and S-2239 was obtained from Diapharma.
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2

Biliverdin Synthesis and Purification

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Biliverdin IXα was purchased from Frontier Scientific Inc. (Logan, UT). DMSO, reduced NADPH, spinach ferredoxin, spinach ferredoxin NADP+ reductase, heme (hemin chloride), sodium ascorbate, and bovine liver catalase were purchased from Sigma (St. Louis, MO). IPTG was purchased from Gold Biotechnology Inc. (St. Louis, MO).
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3

Cholesterol Metabolite Synthesis

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1,4-Cholestadiene-3-one
was obtained from
Research Plus (Barnegat, NJ), and 7α-hydroxycholesterol and
7α-hydroxy-4-cholesten-3-one were from Avanti Polar Lipids (Alabaster,
AL). All other chemicals, including cholesterol, spinach ferredoxin,
spinach ferredoxin-NADP+-reductase, bovine liver catalase,
glucose 6-phosphate, glucose-6-phosphate dehydrogenase, and methyl-β-cyclodextrin,
were purchased from Sigma-Aldrich (St. Louis, MO).
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