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:isopentenyl-diphosphate transtransferase (adding 5 isopentenyl units)

geranylgeranyl diphosphate + 5 isopentenyl diphosphate = 5 diphosphate + all-trans-nonaprenyl diphosphate [RN:R09251]

R09251 > R07267
Reaction

geranylgeranyl diphosphate [CPD:C00353];
isopentenyl diphosphate [CPD:C00129]

Geranylgeranyl diphosphate is preferred over farnesyl diphosphate as allylic substrate [1]. The plant Arabidopsis thaliana has two different enzymes that catalyse this reaction. SPS1 contributes to the biosynthesis of the ubiquinone side-chain while SPS2 supplies the precursor of the plastoquinone side-chains [2].

EC 2.5.1.85 created 1972 as EC 2.5.1.11, part transferred 2010 to EC 2.5.1.85

1  [PMID:12437513]

Hirooka K, Bamba T, Fukusaki E, Kobayashi A

Cloning and kinetic characterization of Arabidopsis thaliana solanesyl diphosphate synthase.

Biochem J 370:679-86 (2003)
DOI:10.1042/BJ20021311

[ath:AT1G78510]

2  [PMID:15784989]

Hirooka K, Izumi Y, An CI, Nakazawa Y, Fukusaki E, Kobayashi A

Functional analysis of two solanesyl diphosphate synthases from Arabidopsis thaliana.

Biosci Biotechnol Biochem 69:592-601 (2005)
DOI:10.1271/bbb.69.592

[ath:AT1G17050]

3  [PMID:15653808]

Jun L, Saiki R, Tatsumi K, Nakagawa T, Kawamukai M

Identification and subcellular localization of two solanesyl diphosphate synthases from Arabidopsis thaliana.

Plant Cell Physiol 45:1882-8 (2004)
DOI:10.1093/pcp/pch211

[ath:AT1G78510 AT1G17050]