Accepted name: geranylgeranyl diphosphate reductase
Reaction: phytyl diphosphate + 3 NADP+ = geranylgeranyl diphosphate + 3 NADPH + 3 H+
Other name(s): geranylgeranyl reductase; CHL P
Systematic name: geranylgeranyl-diphosphate:NADP+ oxidoreductase
Comments: This enzyme also acts on geranylgeranyl-chlorophyll a. The reaction occurs in three steps. Which order the three double bonds are reduced is not known.
1.  Soll, J., Schultz, G., Rudiger, W. and Benz, J. Hydrogenation of geranylgeraniol : two pathways exist in spinach chloroplasts. Plant Physiol. 71 (1983) 849–854. [PMID: 16662918]
2.  Tanaka, R., Oster, U., Kruse, E., Rudiger, W. and Grimm, B. Reduced activity of geranylgeranyl reductase leads to loss of chlorophyll and tocopherol and to partially geranylgeranylated chlorophyll in transgenic tobacco plants expressing antisense RNA for geranylgeranyl reductas. Plant Physiol. 120 (1999) 695–704. [PMID: 10398704]
3.  Keller, Y., Bouvier, F., d'Harlingue, A. and Camara, B. Metabolic compartmentation of plastid prenyllipid biosynthesis—evidence for the involvement of a multifunctional geranylgeranyl reductase. Eur. J. Biochem. 251 (1998) 413–417. [PMID: 9492312]
[EC created 2009]

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