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- W2029335324 abstract "EPR studies on nitrate reductase indicate at 80 °K a signal at g=1.985 and g=2.045 attributable to Mo(V). At 15 °K a signal is observed at g=2.016 due to Fe(III) in an unknown symmetry. The reaction of nitrate reductase with nitrate, nitrite or azide results in changes of the Mo(V) signal. Quantitation of the Mo(V) signal intensity accounts for 15% of the chemical molybdenum content. A similar quantitation of the Fe(III) signal intensity indicates equimolarity with enzymatically reducible g=1.9-type resonance. Enzymatic reduction of nitrate reductase and nitrate with sodium dithionite plus benzyl viologen or molecular hydrogen plus hydrogenase results in the disappearance of the initial Mo(V) and Fe(III) signals and the appearance of a temperature-sensitive iron-sulfide absorption with g-values at 2.057, 1.947 and 1.881 when measured at 15 °K. Chemical reduction of nitrate reductase with sodium dithionite also results in loss of the initial Mo(V) and Fe(III) signals but gives a more complex iron-sulfide signal consisting of two different types of iron-sulfide systems. Quantitation of both types of iron-sulfide system indicated they are present in approx. equal concentrations. These two iron-sulfide systems may differ in redox potential. These studies support the involvement of iron and molybdenum in nitrate reductase." @default.
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- W2029335324 title "The bacterial nitrate reductases: EPR studies on nitrate reductase A from Micrococcus denitrificans" @default.
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- W2029335324 doi "https://doi.org/10.1016/0005-2728(72)90089-8" @default.
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