Catalysis of the reactions: delta-tocopherol = 2-methyl-6-phytyl-1,4-benzene-1,4-diol, gamma-tocopherol = 2,3-dimethyl-6-phytylbenzene-1,4-diol. delta-tocotrienol = 6-geranylgeranyl-2-methylbenzene-1,4-diol gamma-tocotrienol, and = 6-geranylgeranyl-2,3-dimethylbenzene-1,4-diol.
tocopherol cyclase activity