Table 4.

Redox potentials of partner reactions

Enzymes	Redox partner reactions	Potentials (mV)	Ref.
Plant SO	$\frac{1}{2}{\mathrm{O}}_2+2{\mathrm{H}}^{+}+2{\mathrm{e}}^{-}\to 2{\mathrm{H}}_2\mathrm{O}$	+815	335
XO	O2 + e− → O2−	−330	336
XO	O2 + H+ + e− → HO2	−80	336
	O2 + 2H+ + 2e− → H2O2	+295	336
	FAD + 2H+ + 2e− → FADH2	0	335
SO	Cytochrome b5: Fe3+ + e− → Fe2+	77	335
NR	Fdox + e− → Fdred	−350 to −500	335
	Cytochrome c: Fe3+ + e− → Fe2+	235	335
	NAD+ + H+ + 2e− → NADH	−320	335
	Ubiquinone: U + 2H+ + 2e− → UH2	45	335
		90	262
	Menaquinone: M + 2H+ + 2e− → MH2	−70	262
Aio	Rieske: [(Cys)2Fe2S2(His)2] + e− → [(Cys)2Fe2S2(His)2]−	−140 to +350	337