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EC 2.5.1.42 Details
EC number
2.5.1.42
Accepted name
geranylgeranylglycerol-phosphate geranylgeranyltransferase
Reaction
geranylgeranyl diphosphate + 3-(O-geranylgeranyl)-sn-glycerol 1-phosphate = diphosphate + 2,3-bis-(O-geranylgeranyl)-sn-glycerol 1-phosphate
Other name(s)
geranylgeranyloxyglycerol phosphate geranylgeranyltransferase, geranylgeranyltransferase II, (S)-2,3-di-O-geranylgeranylglyceryl phosphate synthase, DGGGP synthase, DGGGPS, geranylgeranyl diphosphate:sn-3-O-(geranylgeranyl)glycerol 1-phosphate geranylgeranyltransferase
Systematic name
geranylgeranyl-diphosphate:3-(O-geranylgeranyl)-sn-glycerol 1-phosphate geranylgeranyltransferase
CAS registry number
124650-68-6
Comment
This enzyme is an integral-membrane protein that carries out the second prenyltransfer reaction involved in the formation of polar membrane lipids in Archaea. Requires a divalent metal cation, such as Mg2+ or Mn2+, for activity [2]. 4-Hydroxybenzoate, 1,4-dihydroxy 2-naphthoate, homogentisate and α-glycerophosphate cannot act as prenyl-acceptor substrates [2]. The other enzymes involved in the biosynthesis of polar lipids in Archaea are EC 1.1.1.261 (sn-glycerol-1-phosphate dehydrogenase), EC 2.5.1.41 (phosphoglycerol geranylgeranyltransferase), which, together with this enzyme, alkylates the hydroxy groups of glycerol 1-phosphate to yield unsaturated archaetidic acid, which is acted upon by EC 2.7.7.67 [CDP-2,3-bis-(O-geranylgeranyl)-sn-glycerol synthase] to form CDP-unsaturated archaeol. The final step in the pathway involves the addition of L-serine, with concomitant removal of CMP, leading to the production of unsaturated archaetidylserine [3]. Belongs in the UbiA prenyltransferase family [2].
History
created 1992, modified 2009
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