Transferases;
Transferring alkyl or aryl groups, other than methyl groups;
Transferring alkyl or aryl groups, other than methyl groups (only sub-subclass identified to date)
BRITE hierarchy

geranylgeranyl-diphosphate:geranylgeranyl-diphosphate geranylgeranyltransferase (15-cis-phytoene-forming)

2 geranylgeranyl diphosphate = 15-cis-phytoene + 2 diphosphate (overall reaction) [RN:R10177];
(1a) 2 geranylgeranyl diphosphate = diphosphate + prephytoene diphosphate [RN:R02065];
(1b) prephytoene diphosphate = 15-cis-phytoene + diphosphate [RN:R04218]

R02065 R04218 R10177;
(other) R07270 R07916
Reaction

geranylgeranyl diphosphate [CPD:C00353];
prephytoene diphosphate [CPD:C03427]

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.

EC 2.5.1.32 created 1984, modified 2005, modified 2012