Question

Oxidation-Reduction Reactions Complex I, the NADH dehydrogenase complex of the mitochondrial respiratory chain, promotes the following series of oxidation-reduction reactions, in which $\mathrm{Fe}^{3+}$ and $\mathrm{Fe}^{2+}$ represent the iron in iron-sulfur centers, $\mathrm{Q}$ is ubiquinone, $\mathrm{QH}_{2}$ is ubiquinol, and $\mathrm{E}$ is the enzyme: (1) $\mathrm{NADH}+H^{+}+\mathrm{E}-\mathrm{FMN} \rightarrow \mathrm{NAD}^{+}$ $+\mathrm{E}-\mathrm{FMNH}_{2}$ (2) E-FMNH $_{2}+2 \mathrm{Fe}^{3+} \rightarrow \mathrm{E}-\mathrm{FMN}+2 \mathrm{Fe}^{2+}+2 \mathrm{H}^{+}$ (3) $2 \mathrm{Fe}^{2+}+2 \mathrm{H}^{+}+\mathrm{Q} \rightarrow 2 \mathrm{Fe}^{3+}+\mathrm{QH}_{2}$ $S u m: \mathrm{NADH}+\mathrm{H}^{+}+\mathrm{Q} \rightarrow \mathrm{NAD}^{+}+\mathrm{QH}_{2}$ For each of the three reactions catalyzed by Complex I, identify (a) the electron donor, (b) the electron acceptor, (c) the conjugate redox pair, (d) the reducing agent, and (e) the oxidizing agent.

          Oxidation-Reduction Reactions Complex I, the NADH dehydrogenase complex of the mitochondrial respiratory chain, promotes the following series of oxidation-reduction reactions, in which $\mathrm{Fe}^{3+}$ and $\mathrm{Fe}^{2+}$ represent the iron in iron-sulfur centers, $\mathrm{Q}$ is ubiquinone, $\mathrm{QH}_{2}$ is ubiquinol, and $\mathrm{E}$ is the enzyme:
(1) $\mathrm{NADH}+H^{+}+\mathrm{E}-\mathrm{FMN} \rightarrow \mathrm{NAD}^{+}$
$+\mathrm{E}-\mathrm{FMNH}_{2}$
(2) E-FMNH $_{2}+2 \mathrm{Fe}^{3+} \rightarrow \mathrm{E}-\mathrm{FMN}+2 \mathrm{Fe}^{2+}+2 \mathrm{H}^{+}$
(3) $2 \mathrm{Fe}^{2+}+2 \mathrm{H}^{+}+\mathrm{Q} \rightarrow 2 \mathrm{Fe}^{3+}+\mathrm{QH}_{2}$
$S u m: \mathrm{NADH}+\mathrm{H}^{+}+\mathrm{Q} \rightarrow \mathrm{NAD}^{+}+\mathrm{QH}_{2}$
For each of the three reactions catalyzed by Complex I, identify (a) the electron donor, (b) the electron acceptor, (c) the conjugate redox pair, (d) the reducing agent, and (e) the oxidizing agent.

Added by Angel J.

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