Geranylgeranyl diphosphate reductase (, geranylgeranyl reductase, CHL P) is an enzyme with systematic name geranylgeranyl-diphosphate:NADP+ oxidoreductase. This enzyme catalises the following chemical reaction

 phytyl diphosphate + 3 NADP+  geranylgeranyl diphosphate + 3 NADPH + 3 H+

This enzyme also acts on geranylgeranyl-chlorophyll a.

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EC 1.3.1