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Caffeate methyltransferase

Figure 3-4. The general phenylpropanoid pathway. The enzymes involved in this pathway are (a) phenylalanine ammonia lyase (PAL E.C. 4.3.1.5), (b) cinnamic acid 4-hydroxylase (C4H E.C. 1.14.13.11), and (J) 4-coumaric acid CoA ligase (4CL E.C. 6.2.1.12). (a) depicts tyrosine ammonia lyase activity in PAL of graminaceous species. The grey structures in the box represent an older version of the phenylpropanoid pathway in which the ring substitution reactions were thought to occur at the level of the hydroxycinnamic acids and/or hydroxycinnamoyl esters. The enzymes involved in these conversions are (c) coumarate 3-hydroxylase (C3H E.C. 1.14.14.1), (d) caffeate O-methyltransferase (COMT EC 2.1.1.68), (e) ferulate 5-hydroxylase (F5H EC 1.14.13), and (g) caffeoyl-CoA O-methyltransferase (CCoA-OMT EC 2.1.1.104). These enzymes are discussed in more detail in Section 10. Figure 3-4. The general phenylpropanoid pathway. The enzymes involved in this pathway are (a) phenylalanine ammonia lyase (PAL E.C. 4.3.1.5), (b) cinnamic acid 4-hydroxylase (C4H E.C. 1.14.13.11), and (J) 4-coumaric acid CoA ligase (4CL E.C. 6.2.1.12). (a) depicts tyrosine ammonia lyase activity in PAL of graminaceous species. The grey structures in the box represent an older version of the phenylpropanoid pathway in which the ring substitution reactions were thought to occur at the level of the hydroxycinnamic acids and/or hydroxycinnamoyl esters. The enzymes involved in these conversions are (c) coumarate 3-hydroxylase (C3H E.C. 1.14.14.1), (d) caffeate O-methyltransferase (COMT EC 2.1.1.68), (e) ferulate 5-hydroxylase (F5H EC 1.14.13), and (g) caffeoyl-CoA O-methyltransferase (CCoA-OMT EC 2.1.1.104). These enzymes are discussed in more detail in Section 10.
Syringyl Lignin Pathways Two key enzymes (beyond the coniferyl alcohol pathway) are required for the production of sinapyl alcohol, which is the essential monolignol for production of syringyl units in lignins. Ferulate 5-hydroxylase, FH5, now perhaps more appropriately called CAld-5H to reflect coniferaldehyde as the preferred substrate [347,348], effects the 5-hydroxylation. Caffeate 0-methyltransferase,... [Pg.195]

It shlklmate dehydrogenase, 2t phenylalanine ammonia-lyase, 3> cinnamic acid 4-hydroxylase, 4 SAMI caffeate 3-0-methyltransferase, 5t hy-droxyclnnamatet CoA llgase, 6t "flavanone synthase", 7t chalcone-flavanone isomerase, 8t SAMt 3, 4 -dihydroxyflavonoid 3 0-methyltrans-[Pg.236]

Figure 9.3 The lignin biosynthesis pathway. Abbreviations of enzymes are PAL = phenylalanine-ammonia-lyase C4H = cinnamate 4-hydroxylase 4CL = hydroxycinnamate CoA-ligase C3H = 4-hydroxycinnamate 3-hydroxylase COMT = S-adenosyl-methionine caffeate/5-hydroxyferulate-0-methyltransferase CAD = hydroxycinnamyl alcohol dehydrogenase C5H = coniferaldehyde-5-hydroxylase. Figure 9.3 The lignin biosynthesis pathway. Abbreviations of enzymes are PAL = phenylalanine-ammonia-lyase C4H = cinnamate 4-hydroxylase 4CL = hydroxycinnamate CoA-ligase C3H = 4-hydroxycinnamate 3-hydroxylase COMT = S-adenosyl-methionine caffeate/5-hydroxyferulate-0-methyltransferase CAD = hydroxycinnamyl alcohol dehydrogenase C5H = coniferaldehyde-5-hydroxylase.
Phenylalanine ammonia-lyase 2 cinnamate 4-monooxygenase 3 phenol oxidase 4 0-methyl-transferases, e.g., caffeate 0-methyltransferase... [Pg.431]

See other pages where Caffeate methyltransferase is mentioned: [Pg.191]    [Pg.193]    [Pg.1102]    [Pg.993]    [Pg.54]   
See also in sourсe #XX -- [ Pg.54 , Pg.431 ]



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