Enzymes
| UniProtKB help_outline | 1 proteins |
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- Name help_outline (S)-norreticuline Identifier CHEBI:143273 Charge 1 Formula C18H22NO4 InChIKeyhelp_outline FVEMXQCEJGGXJB-AWEZNQCLSA-O SMILEShelp_outline C1=C(C(=CC2=C1[C@@H]([NH2+]CC2)CC3=CC=C(C(=C3)O)OC)OC)O 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline S-adenosyl-L-methionine Identifier CHEBI:59789 Charge 1 Formula C15H23N6O5S InChIKeyhelp_outline MEFKEPWMEQBLKI-AIRLBKTGSA-O SMILEShelp_outline C[S+](CC[C@H]([NH3+])C([O-])=O)C[C@H]1O[C@H]([C@H](O)[C@@H]1O)n1cnc2c(N)ncnc12 2D coordinates Mol file for the small molecule Search links Involved in 842 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline (S)-norcodamine Identifier CHEBI:143271 Charge 1 Formula C19H24NO4 InChIKeyhelp_outline YUUVQMNYXHZRSK-HNNXBMFYSA-O SMILEShelp_outline C1=C(C(=CC2=C1[C@@H]([NH2+]CC2)CC3=CC=C(C(=C3)OC)OC)OC)O 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,176 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline S-adenosyl-L-homocysteine Identifier CHEBI:57856 Charge 0 Formula C14H20N6O5S InChIKeyhelp_outline ZJUKTBDSGOFHSH-WFMPWKQPSA-N SMILEShelp_outline Nc1ncnc2n(cnc12)[C@@H]1O[C@H](CSCC[C@H]([NH3+])C([O-])=O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 768 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:22180 | RHEA:22181 | RHEA:22182 | RHEA:22183 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
| UniProtKB help_outline |
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Publications
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Characterization of three O-methyltransferases involved in noscapine biosynthesis in opium poppy.
Dang T.T., Facchini P.J.
Noscapine is a benzylisoquinoline alkaloid produced in opium poppy (Papaver somniferum) and other members of the Papaveraceae. It has been used as a cough suppressant and more recently was shown to possess anticancer activity. However, the biosynthesis of noscapine in opium poppy has not been esta ... >> More
Noscapine is a benzylisoquinoline alkaloid produced in opium poppy (Papaver somniferum) and other members of the Papaveraceae. It has been used as a cough suppressant and more recently was shown to possess anticancer activity. However, the biosynthesis of noscapine in opium poppy has not been established. A proposed pathway leading from (S)-reticuline to noscapine includes (S)-scoulerine, (S)-canadine, and (S)-N-methylcanadine as intermediates. Stem cDNA libraries and latex extracts of eight opium poppy cultivars displaying different alkaloid profiles were subjected to massively parallel pyrosequencing and liquid chromatography-tandem mass spectrometry, respectively. Comparative transcript and metabolite profiling revealed the occurrence of three cDNAs encoding O-methyltransferases designated as SOMT1, SOMT2, and SOMT3 that correlated with the accumulation of noscapine in the eight cultivars. SOMT transcripts were detected in all opium poppy organs but were most abundant in aerial organs, where noscapine primarily accumulates. SOMT2 and SOMT3 showed strict substrate specificity and regiospecificity as 9-O-methyltransferases targeting (S)-scoulerine. In contrast, SOMT1 was able to sequentially 9- and 2-O-methylate (S)-scoulerine, yielding (S)-tetrahydropalmatine. SOMT1 also sequentially 3'- and 7-O-methylated both (S)-norreticuline and (S)-reticuline with relatively high substrate affinity, yielding (S)-tetrahydropapaverine and (S)-laudanosine, respectively. The metabolic functions of SOMT1, SOMT2, and SOMT3 were investigated in planta using virus-induced gene silencing. Reduction of SOMT1 or SOMT2 transcript levels resulted in a significant decrease in noscapine accumulation. Reduced SOMT1 transcript levels also caused a decrease in papaverine accumulation, confirming the selective roles for these enzymes in the biosynthesis of both alkaloids in opium poppy. << Less
Plant Physiol. 159:618-631(2012) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.