ID 1.3.1.111 DE Geranylgeranyl-bacteriochlorophyllide a reductase. CA Bacteriochlorophyll a + 3 NADP(+) = CA geranylgeranyl bacteriochlorophyllide a + 3 NADPH. CC -!- The enzyme catalyzes the successive reduction of the geranylgeraniol CC esterifying group to phytol, reducing three out of four double bonds, CC and transforming geranylgeranyl bacteriochlorophyllide a via CC dihydrogeranylgeranyl bacteriochlorophyllide a and CC tetrahydrogeranylgeranyl bacteriochlorophyllide a to CC bacteriochlorophyll a. CC -!- The enzyme can also accept the pheophytin derivative geranylgeranyl CC bacteriopheophytin, converting it to bacteriopheophytin a. //