EC Number   |
Natural Substrates |
|---|
    1.3.1.83 | geranylgeranyl diphosphate + 3 NADPH + 3 H+ |
- |
| 1.3.1.83 | geranylgeranyl diphosphate + NADPH + H+ |
due to its multifunctionality and weak hydrophobicity, it is suggested that in plastids the same geranylgeranyl reductase is recruited into the chlorophyll, the tocopherol and the phylloquinone pathways. The geranylgeranyl reductase gene is up-regulated during etioplast to chloroplast and chloroplast to chromoplast development |
| 1.3.1.83 | geranylgeranyl diphosphate + NADPH + H+ |
the transcription of geranylgeranyl diphosphate reductase is likely to be regulated during leaf development. Transcription is stimulated by light, but repressed by dark and cold stress. Geranylgeranyl diphosphate reductase expression is regulated by photosynthetic activity and is possibly involved in the defence response |
| 1.3.1.83 | geranylgeranyl diphosphate + NADPH + H+ |
this enzyme P provides phytol for both tocopherol and chlorophyll synthesis |
| 1.3.1.83 | geranylgeranyl-chlorophyll + 3 NADPH + 3 H+ |
reduction in enzyme activity in transgenic Nicotiana tabacum plants is accompanied by the reduction in total chlorophyll and tocopherol content and the accumulation of geranylgeranylated chlorophyll. The presence of geranylgeranylated chlorophyll has no influence on harvesting and transfer of light energy in either photosystem. However, the reduced tocopherol content of the thylakoid membrane is a limiting factor for defensive reactions to photo-oxidative stress |
| 1.3.1.83 | more |
geranylgeranyl reductase catalyses the reduction of geranylgeranyl diphosphate to phytyl diphosphate required for synthesis of chlorophylls, phylloquinone and tocopherols |
