Reaction catalyzed by geranylgeranyl diphosphate reductase (1.3.1.83), geranylgeranyl-bacteriochlorophyllide a reductase (1.3.1.111)
+
3
NADPH
+
3
=
+
3
NADP+
geranylgeranyl-bacteriochlorophyll a
+
3 NADPH
+
3 H+
=
phytyl-bacteriochlorophyll a
+
3 NADP+
