Reaction: narcotine hemiacetal + NAD+ = noscapine + NADH + H+
For diagram of reaction click here.
Glossary: noscapine = (3S)-6,7-dimethoxy-3-[(5R)-4-methoxy-6-methyl-5,6,7,8-tetrahydro[1,3]dioxolo[4,5-g]isoquinolin-5-yl]isobenzofuran-1(3H)-one
narcotine hemiacetal = (3S)-6,7-dimethoxy-3-[(5R)-4-methoxy-6-methyl-5,6,7,8-tetrahydro[1,3]dioxolo[4,5-g]isoquinolin-5-yl]-1,3-dihydroisobenzofuran-1-ol
Other name(s): NOS (gene name)
Systematic name: narcotine hemiacetal:NAD+ 1-oxidoreductase
Comments: The enzyme, characterized from the plant Papaver somniferum (opium poppy), catalyses the last step in the biosynthesis of the isoquinoline alkaloid noscapine.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:
1. Chen, X. and Facchini, P.J. Short-chain dehydrogenase/reductase catalyzing the final step of noscapine biosynthesis is localized to laticifers in opium poppy. Plant J. 77 (2014) 173-184. [PMID: 24708518]
2. Li, Y., Li, S., Thodey, K., Trenchard, I., Cravens, A. and Smolke, C.D. Complete biosynthesis of noscapine and halogenated alkaloids in yeast. Proc. Natl Acad. Sci. USA 115 (2018) E3922-E3931. [PMID: 29610307]