The Enzyme Database

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Accepted name: tocopherol O-methyltransferase
Reaction: (1) S-adenosyl-L-methionine + γ-tocopherol = S-adenosyl-L-homocysteine + α-tocopherol
(2) S-adenosyl-L-methionine + δ-tocopherol = S-adenosyl-L-homocysteine + β-tocopherol
(3) S-adenosyl-L-methionine + γ-tocotrienol = S-adenosyl-L-homocysteine + α-tocotrienol
(4) S-adenosyl-L-methionine + δ-tocotrienol = S-adenosyl-L-homocysteine + β-tocotrienol
For diagram of tocopherol biosynthesis, click here and for diagram of tocotrienol biosynthesis, click here
Other name(s): γ-tocopherol methyltransferase; VTE4 (gene name)
Systematic name: S-adenosyl-L-methionine:γ-tocopherol 5-O-methyltransferase
Comments: The enzymes from plants and photosynthetic bacteria have similar efficiency with the γ and δ isomers of tocopherols and tocotrienols.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 84788-82-9
1.  Camara, B. and D'Harlingue, A. Demonstration and solubilization of S-adenosylmethionine - γ-tocopherol methyltransferase from capsicum chromoplasts. Plant Cell Rep. 4 (1985) 31–32. [PMID: 24253640]
2.  Koch, M., Lemke, R., Heise, K.P. and Mock, H.P. Characterization of γ-tocopherol methyltransferases from Capsicum annuum L and Arabidopsis thaliana. Eur. J. Biochem. 270 (2003) 84–92. [DOI] [PMID: 12492478]
3.  Zhang, G.Y., Liu, R.R., Xu, G., Zhang, P., Li, Y., Tang, K.X., Liang, G.H. and Liu, Q.Q. Increased α-tocotrienol content in seeds of transgenic rice overexpressing Arabidopsis γ-tocopherol methyltransferase. Transgenic Res. 22 (2013) 89–99. [DOI] [PMID: 22763462]
[EC created 1989, modified 2013]

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