نتایج جستجو برای: alkaloid biosynthesis
تعداد نتایج: 79452 فیلتر نتایج به سال:
Molecular clones encoding nine consecutive biosynthetic enzymes that catalyze the conversion of l-dopa to the protoberberine alkaloid (S)-canadine were isolated from meadow rue (Thalictrum flavum ssp glaucum). The predicted proteins showed extensive sequence identity with corresponding enzymes involved in the biosynthesis of related benzylisoquinoline alkaloids in other species, such as opium p...
Bioactivity-directed fractionation led to the isolation of a new N-(methoxycarbonyl) phenanthrene alkaloid, romucosine I (1), along with three known N-(methoxycarbonyl) alkaloids, romucosine C (2), tuduranine (3), and promucosine (4). The structures of these compounds were identified on the basis of spectral data and chemical evidence. A proposed biogenesis about these isolates is also reported...
Optimized nutrient medium for galanthamine production in Leucojum aestivum L. in vitro shoot system.
The common effect of NH4+, NO3-, KH2PO4 and sucrose on the biosynthesis of galanthamine by a Leucojum aestivum shoot culture was studied. Polynominal regression models were elaborated for the description of the galanthamine biosynthesis as a consequence of variation of the investigated variables (NH4+ between 0.20 and 0.54 g/L; NO3- between 1.44 and 3.44 g/L; KH2PO4 between 0.10 and 0.24 g/L, a...
The esterification of methylecgonine (2-carbomethoxy-3β-tropine) with benzoic acid is the final step in the biosynthetic pathway leading to the production of cocaine in Erythoxylum coca. Here we report the identification of a member of the BAHD family of plant acyltransferases as cocaine synthase. The enzyme is capable of producing both cocaine and cinnamoylcocaine via the activated benzoyl- or...
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