Reaction catalyzed by thioredoxin-disulfide reductase (1.8.1.9), NADH:ubiquinone reductase (H+-translocating) (7.1.1.2), NADH:ubiquinone reductase (Na+-transporting) (7.2.1.1)

	NADH	+			=		NAD+	+
	NADH	+		ubiquinone-10	=		NAD+	+		ubiquinol-10