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EC 2.5.1.116 Details
EC number
2.5.1.116
Accepted name
homogentisate geranylgeranyltransferase
Reaction
geranylgeranyl diphosphate + homogentisate = diphosphate + 6-geranylgeranyl-2-methylbenzene-1,4-diol + CO2
Other name(s)
HGGT, slr1736 (gene name)
Systematic name
geranylgeranyl-diphosphate:homogentisate geranylgeranyltransferase
Comment
Requires Mg2+ for activity. Involved in the biosynthesis of the vitamin E, tocotrienols. While the enzyme from the bacterium Synechocystis PCC 6803 has higher activity with phytyl diphosphate (EC 2.5.1.115, homogentisate phytyltransferase), the enzymes from barley, rice and wheat have only a low activity with that substrate [2].
History
created 2014
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