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Your query returned 3 entries. Printable version
EC | 2.1.1.295 | ||||||||
Accepted name: | 2-methyl-6-phytyl-1,4-hydroquinone methyltransferase | ||||||||
Reaction: | (1) S-adenosyl-L-methionine + 2-methyl-6-phytylbenzene-1,4-diol = S-adenosyl-L-homocysteine + 2,3-dimethyl-6-phytylbenzene-1,4-diol (2) S-adenosyl-L-methionine + 2-methyl-6-all-trans-nonaprenylbenzene-1,4-diol = S-adenosyl-L-homocysteine + plastoquinol (3) S-adenosyl-L-methionine + 6-geranylgeranyl-2-methylbenzene-1,4-diol = S-adenosyl-L-homocysteine + 6-geranylgeranyl-2,3-dimethylbenzene-1,4-diol |
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For diagram of tocopherol biosynthesis, click here and for diagram of tocotrienol biosynthesis, click here | |||||||||
Other name(s): | VTE3 (gene name); 2-methyl-6-solanyl-1,4-hydroquinone methyltransferase; MPBQ/MSBQ methyltransferase; MPBQ/MSBQ MT | ||||||||
Systematic name: | S-adenosyl-L-methionine:2-methyl-6-phytyl-1,4-benzoquinol C-3-methyltransferase | ||||||||
Comments: | Involved in the biosynthesis of plastoquinol, as well as vitamin E (tocopherols and tocotrienols). | ||||||||
Links to other databases: | BRENDA, EXPASY, KEGG, MetaCyc | ||||||||
References: |
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EC | 2.5.1.115 | ||||||||
Accepted name: | homogentisate phytyltransferase | ||||||||
Reaction: | phytyl diphosphate + homogentisate = diphosphate + 2-methyl-6-phytylbenzene-1,4-diol + CO2 | ||||||||
For diagram of the homogentisate pathways, click here | |||||||||
Glossary: | 2-methyl-6-phytylbenzene-1,4-diol = MPBQ | ||||||||
Other name(s): | HPT; VTE2 (gene name) | ||||||||
Systematic name: | phytyl-diphosphate:homogentisate phytyltransferase | ||||||||
Comments: | Requires Mg2+ for activity [3]. Involved in the biosynthesis of the vitamin E tocopherols. While the enzyme from the cyanobacterium Synechocystis PCC 6803 has an appreciable activity with geranylgeranyl diphosphate (EC 2.5.1.116, homogentisate geranylgeranyltransferase), the enzyme from the plant Arabidopsis thaliana has only a low activity with that substrate [1,3,4]. | ||||||||
Links to other databases: | BRENDA, EXPASY, KEGG, MetaCyc | ||||||||
References: |
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EC | 5.5.1.24 | ||||||||
Accepted name: | tocopherol cyclase | ||||||||
Reaction: | (1) δ-tocopherol = 2-methyl-6-phytylbenzene-1,4-diol (2) γ-tocopherol = 2,3-dimethyl-6-phytylbenzene-1,4-diol (3) δ-tocotrienol = 6-geranylgeranyl-2-methylbenzene-1,4-diol (4) γ-tocotrienol = 6-geranylgeranyl-2,3-dimethylbenzene-1,4-diol |
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For diagram of tocopherol biosynthesis, click here and for diagram of tocotrienol biosynthesis, click here | |||||||||
Other name(s): | VTE1 (gene name); SXD1 (gene name); δ/γ-tocopherol lyase (decyclizing) | ||||||||
Systematic name: | δ/γ-tocopherol lyase (ring-opening) | ||||||||
Comments: | The enzyme has been described from plants and cyanobacteria. It has similar activity with all four listed benzoquinol substrates. Involved in the biosynthesis of vitamin E (tocopherols and tocotrienols). | ||||||||
Links to other databases: | BRENDA, EXPASY, KEGG, MetaCyc | ||||||||
References: |
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