The Enzyme Database

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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
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:
1.  Shintani, D.K., Cheng, Z. and DellaPenna, D. The role of 2-methyl-6-phytylbenzoquinone methyltransferase in determining tocopherol composition in Synechocystis sp. PCC6803. FEBS Lett. 511 (2002) 1–5. [DOI] [PMID: 11821038]
2.  Cheng, Z., Sattler, S., Maeda, H., Sakuragi, Y., Bryant, D.A. and DellaPenna, D. Highly divergent methyltransferases catalyze a conserved reaction in tocopherol and plastoquinone synthesis in cyanobacteria and photosynthetic eukaryotes. Plant Cell 15 (2003) 2343–2356. [DOI] [PMID: 14508009]
3.  Van Eenennaam, A.L., Lincoln, K., Durrett, T.P., Valentin, H.E., Shewmaker, C.K., Thorne, G.M., Jiang, J., Baszis, S.R., Levering, C.K., Aasen, E.D., Hao, M., Stein, J.C., Norris, S.R. and Last, R.L. Engineering vitamin E content: from Arabidopsis mutant to soy oil. Plant Cell 15 (2003) 3007–3019. [DOI] [PMID: 14630966]
[EC 2.1.1.295 created 2014]
 
 
EC 2.5.1.117     
Accepted name: homogentisate solanesyltransferase
Reaction: all-trans-nonaprenyl diphosphate + homogentisate = diphosphate + 2-methyl-6-all-trans-nonaprenylbenzene-1,4-diol + CO2
For diagram of the homogentisate pathways, click here
Glossary: 2-methyl-6-all-trans-nonaprenylbenzene-1,4-diol = 2-methyl-6-solanesylbenzene-1,4-diol = MSBQ
Other name(s): HST; PDS2 (gene name)
Systematic name: all-trans-nonaprenyl-diphosphate:homogentisate nonaprenyltransferase
Comments: Requires Mg2+ for activity. Part of the biosynthesis pathway of plastoquinol-9. The enzymes purified from the plant Arabidopsis thaliana and the alga Chlamydomonas reinhardtii are also active in vitro with unsaturated C10 to C20 prenyl diphosphates, producing main products that are not decarboxylated [2].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Sadre, R., Gruber, J. and Frentzen, M. Characterization of homogentisate prenyltransferases involved in plastoquinone-9 and tocochromanol biosynthesis. FEBS Lett. 580 (2006) 5357–5362. [DOI] [PMID: 16989822]
2.  Sadre, R., Frentzen, M., Saeed, M. and Hawkes, T. Catalytic reactions of the homogentisate prenyl transferase involved in plastoquinone-9 biosynthesis. J. Biol. Chem. 285 (2010) 18191–18198. [DOI] [PMID: 20400515]
[EC 2.5.1.117 created 2014]
 
 


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