Reaction catalyzed by xanthine dehydrogenase (1.17.1.4)
2
+
2
NAD+
+
2
H2O
=
+
+
2
NADH
+
2
2 hypoxanthine
+
2 NAD+
+
2 H2O
=
xanthine
+
6,8-dihydroxypurine
+
2 NADH
+
2 H+
