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EC 2.5.1.32 Details
EC number
2.5.1.32
Accepted name
15-cis-phytoene synthase
Reaction
2 geranylgeranyl diphosphate = 15-cis-phytoene + 2 diphosphate (overall reaction);;(1a) 2 geranylgeranyl diphosphate = diphosphate + prephytoene diphosphate;;(1b) prephytoene diphosphate = 15-cis-phytoene + diphosphate
Other name(s)
PSY (gene name), crtB (gene name), prephytoene-diphosphate synthase, phytoene synthetase, PSase, geranylgeranyl-diphosphate geranylgeranyltransferase
Systematic name
geranylgeranyl-diphosphate:geranylgeranyl-diphosphate geranylgeranyltransferase (15-cis-phytoene-forming)
CAS registry number
50936-61-3
Comment
Requires Mn2+ for activity. The enzyme condenses two molecules of geranylgeranyl diphosphate to give prephytoene diphosphate, followed by rearrangement of the cyclopropylcarbinyl intermediate to 15-cis-phytoene.
History
created 1984, modified 2005, modified 2012
EC Tree
2.5.1.12 created 1972, deleted 1976
2.5.1.13 created 1972, deleted 1976
2.5.1.14 created 1972, deleted 1976
2.5.1.37 created 1989, deleted 2004
2.5.1.40 created 1992, deleted 1999