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Stereospecificity of hydride removal from NADH by reductases of multicomponent nonheme iron oxygenase systems
H R Schläfli1, D P Baker, T Leisinger
1Microbiology Institute, Swiss Federal Institute of Technology, Zürich, Switzerland.
Abstract:
The stereospecificity of hydride removal from the 4 position of the pyridine ring of NADH by reductases from all three classes of multicomponent nonheme iron oxygenases was examined. The class I and II reductases, modules of which show significant sequence similarity with and which belong to the ferredoxin-NADP+ reductase family of flavin-dependent oxidoreductases, transferred the pro-R hydrogen. By contrast, the class II enzymes, which do not show significant sequence similarity to the class I and III enzymes but modules of which belong to the glutathione reductase family of flavoenzymes, transferred the pro-S hydrogen.