ID   2.5.1.116
DE   homogentisate geranylgeranyltransferase.
AN   HGGT.
CA   (2E,6E,10E)-geranylgeranyl diphosphate + H(+) + homogentisate =
CA   6-geranylgeranyl-2-methylbenzene-1,4-diol + CO2 + diphosphate.
CC   -!- Involved in the biosynthesis of the vitamin E, tocotrienols.
CC   -!- While the enzyme from the bacterium Synechocystis PCC 6803 has higher
CC       activity with phytyl diphosphate (EC 2.5.1.115) the enzymes from
CC       barley, rice and wheat have only a low activity with that substrate.
DR   Q7XB14, HGGT_HORVU ;  Q0DAK7, HGGT_ORYSJ ;  Q7XB13, HGGT_WHEAT ;
//