Reaction catalyzed by ketol-acid reductoisomerase (NADP+) (1.1.1.86)
+
NADP+
=
+
NADPH
+
(2R)-2,3-dihydroxy-3-methylbutanoate
+
NADP+
=
(2S)-2-hydroxy-2-methyl-3-oxobutanoate
+
NADPH
+
H+
