All-trans-phytoene synthase

Template:Short description Template:Infobox enzyme All-trans-phytoene synthase (Template:EC number, 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 $\rightleftharpoons$ all-trans-phytoene + 2 diphosphate (overall reaction)

(1a) 2 geranylgeranyl diphosphate $\rightleftharpoons$ diphosphate + prephytoene diphosphate

(1b) prephytoene diphosphate $\rightleftharpoons$ all-trans-phytoene + diphosphate

This enzyme requires Mn²⁺ for activity.

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