All-trans-phytoene synthase (, prephytoene-diphosphate synthase, phytoene synthetase, PSase, geranylgeranyl-diphosphate geranylgeranyltransferase, 15-trans-phytoene synthase) is an enzyme with systematic name geranylgeranyl-diphosphate:geranylgeranyl-diphosphate geranylgeranyltransferase (all-trans-phytoene forming). This enzyme catalyses the following chemical reaction
2 geranylgeranyl diphosphate all-trans-phytoene + 2 diphosphate (overall reaction) (1a) 2 geranylgeranyl diphosphate diphosphate + prephytoene diphosphate (1b) prephytoene diphosphate all-trans-phytoene + diphosphate
This enzyme requires Mn2+ for activity.
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