2.1.1.140: (S)-coclaurine-N-methyltransferase
This is an abbreviated version!
For detailed information about (S)-coclaurine-N-methyltransferase, go to the full flat file.
Word Map on EC 2.1.1.140
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2.1.1.140
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benzylisoquinoline
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n-methylated
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japonica
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coptis
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isoquinoline
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norreticuline
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s-reticuline
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n-methyltransferases
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norcoclaurine
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poppy
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scoulerine
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somniferum
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3\'-hydroxylase
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4\'omt
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magnoflorine
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6-o-methyltransferase
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opium
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papaver
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tetrahydroisoquinoline
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aporphine
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medicine
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biotechnology
- 2.1.1.140
-
benzylisoquinoline
-
n-methylated
- japonica
- coptis
- isoquinoline
- norreticuline
-
s-reticuline
- n-methyltransferases
- norcoclaurine
- poppy
- scoulerine
- somniferum
-
3\'-hydroxylase
-
4\'omt
- magnoflorine
-
6-o-methyltransferase
-
opium
-
papaver
- tetrahydroisoquinoline
-
aporphine
- medicine
- biotechnology
Reaction
Synonyms
(S)-Coclaurine N-methyltransferase, 6OMT, CjCNMT, CMT, CNMT, CNMT protein, coclaurine N-methyltransferase, coclaurine-N-methyltransferase, FspC, S-adenosyl-L-methionine:coclaurine N-methyltransferase
ECTree
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General Information
General Information on EC 2.1.1.140 - (S)-coclaurine-N-methyltransferase
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malfunction
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plants exhibiting reduced CNMT transcript levels show a significant fourfold increase in the relative abundance of papaverine, and a reduction in the accumulation of thebaine and noscapine. Norlaudanine is only detected in CNMT-suppressed plants. The levels of several N-methylated compounds, including N-methylcoclaurine, N,N-dimethylcoclaurine, 4'-O-methyl-N-methylcoclaurine, reticuline, N,N-dimethylreticuline, codamine, laudanine, laudanosine and salutaridine, and four phathelideisoquinoline alkaloids (i.e. narcotoline, noscapine, N,N-dimethylnarcotine and another noscapine-like compound) are also reduced in CNMT-suppressed plants
metabolism
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the enzyme is involved in the biosynthesis pathways of alkaloids in Papaver somniferum, overview. Subsequent 6-O-methylation, N-methylation, 3'-hydroxylation and 4'-O-methylation convert (S)-norcoclaurine to (S)-reticuline, which is a branch-point intermediate in the formation of most BIA structural sub-groups, including morphinan (e.g. morphine), phthalideisoquinoline (e.g. noscapine) and benzophenanthridine (e.g. sanguinarine) alkaloids
physiological function
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fumisoquin biosynthesis requires the N-methyltransferase FsqC and the FAD-dependent oxidase FsqB, which represent functional analogs of coclaurine N-methyltransferase and berberine bridge enzyme in plants. Deletion of the N-methyltransferase FsqC, phenol 2-monooxygenase FsqG, or FAD-dependent oxidase FsqB in a strain overexpressing FsqA leads to complete abolishment of isoquinoline alkaloid production and accumulation of a series of benzyl pyrroles, including fumipyrrole