Reaction catalyzed by ketol-acid reductoisomerase (NADP+) (1.1.1.86)
+
NADP+
=
+
NADPH
+
2-aceto-2-hydroxybutyrate
+
NADP+
=
(2R,3R)-2,3-dihydroxy-3-methylvalerate
+
NADPH
+
H+
