ID   1.3.1.111
DE   geranylgeranyl-bacteriochlorophyllide a reductase.
CA   bacteriochlorophyll a + 3 NADP(+) = geranylgeranyl-bacteriochlorophyllide
CA   a + 3 H(+) + 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.
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