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All-trans-phytoene synthase

Class of enzymes

Field	Value
Name	All-trans-phytoene synthase
EC_number	2.5.1.99

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 \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.

References

(March 1974). "The stereochemistry of trans-phytoene synthesis. Some observations on lycopersene as a carotene precursor and a mechanism for the synthesis of cis- and trans-phytoene". Biochemistry.
(March 2003). "Bacterial phytoene synthase: molecular cloning, expression, and characterization of Erwinia herbicola phytoene synthase". Biochemistry.

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ec-2.5.1

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