baccatin iii/taxus cuspidata

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Studies on factors influencing stability and recovery of paclitaxel from suspension media and cultures of Taxus cuspidata cv Densiformis by high-performance liquid chromatography.

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An HPLC method was developed for quick scanning of taxanes from large numbers of plant cell suspension samples. The method was optimized for analysis of a range of taxanes of differing polarity. Identification of a standard mixture of paclitaxel and 12 related taxanes was achieved in less than 15

Accelerated solvent extraction of paclitaxel and related compounds from the bark of taxus cuspidata

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Accelerated solvent extraction (ASE) of paclitaxel and related compounds from Taxus cuspidata (Japanese yew) bark has been investigated under various conditions. In ASE, pressure is applied to the sample extraction cell to maintain the heated solvent in a liquid state during the extraction. This

Expression profiling of genes involved in paclitaxel biosynthesis for targeted metabolic engineering.

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Taxus plant suspension cell cultures provide a sustainable source of paclitaxel (Taxol) for the treatment of many cancers. To develop an optimal bioprocess for paclitaxel supply, taxane biosynthetic pathway regulation must be better understood. Here we examine the expression profile of paclitaxel

Partial purification and characterization of acetyl coenzyme A: taxa-4(20),11(12)-dien-5alpha-ol O-acetyl transferase that catalyzes the first acylation step of taxol biosynthesis.

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The acetylation of taxa-4(20),11(12)-dien-5alpha-ol is considered to be the third specific step of Taxol biosynthesis that precedes further hydroxylation of the taxane nucleus. An operationally soluble acetyl CoA:taxadienol-O-acetyl transferase was demonstrated in extracts of Taxus canadensis and

Rapid screening for taxanes by tandem mass spectrometry.

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A highly specific and sensitive method is described for determining taxol, cephalomannine, and baccatin III in crude plant extracts. Radical anions of the taxanes are formed by desorption chemical ionization, and a parent tandem mass spectrometric scan is used to recognize these compounds by their

Rapid separation of four main taxoids in Taxus species by a combined LLP-SPE-HPLC (PAD) procedure.

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A method is described for the simultaneous determination of paclitaxel and three related taxoids, 10-deacetylbaccatin III (10-DAB III), baccatin III, and cephalomannine, in the extracts from the needles of three Chinese yew species, Taxus cuspidata, T. chinensis, and T. media. SPE was applied as the

The taxol pathway 10-O-acetyltransferase shows regioselective promiscuity with the oxetane hydroxyl of 4-deacetyltaxanes.

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The 10-deacetylbaccatin III:10beta-O-acetyltransferase isolated from Taxus cuspidata regiospecifically transfers short-chain alkanoyl groups from their corresponding CoA thioesters to the C10 hydroxyl of 10-deacetylbaccatin III. This 10-O-acetyltransferase along with five other Taxus

Molecular cloning of a 10-deacetylbaccatin III-10-O-acetyl transferase cDNA from Taxus and functional expression in Escherichia coli.

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The cDNA clone for a 10-deacetylbaccatin III-10-O-acetyl transferase, which catalyzes formation of the last diterpene intermediate in the Taxol biosynthetic pathway, has been isolated from Taxus cuspidata. By using consensus sequences from an assembly of transacylases of plant origin and from many

Determination of paclitaxel and other six taxoids in Taxus species by high-performance liquid chromatography-tandem mass spectrometry.

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A method of high-performance liquid chromatography-tandem mass spectrometry (LC-MS-MS) has been developed for the trace analysis of paclitaxel and other six taxoids in three Taxus species including Taxus cuspidata, Taxus media and Taxus chinensis var. mairiei. Seven taxoids were separated using a

Microbial transformation of cephalomannine by Luteibacter sp.

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Luteibacter sp., a new bacterium isolated from the soil around a Taxus cuspidata Sieb. et Zucc plant, was studied for its capability to metabolize cephalomannine (1). After preparative fermentation, eight metabolites were obtained and characterized as baccatin III (2), baccatin V (3),

Taxane recovery from cells of Taxus in micro- and hypergravity.

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Cell suspension cultures of Taxus cuspidata produce taxanes that are released from the outer surface of cells into the culture medium as free and bound alkaloids. Paclitaxel (Taxol (TM)), is an anti-cancer drug in short supply. It has a taxane ring derived from baccatin III and a C-13

Molecular cloning and heterologous expression of the C-13 phenylpropanoid side chain-CoA acyltransferase that functions in Taxol biosynthesis.

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The structural pharmacophore of Taxol, responsible for binding the N terminus of the beta-subunit of tubulin to arrest cell proliferation, comprises, in part, the 13-O-(N-benzoyl-3-phenylisoserinoyl) side chain. To identify the side chain transferase of Taxol biosynthesis, a set of transacylases

The kinetics of taxoid accumulation in cell suspension cultures of Taxus following elicitation with methyl jasmonate.

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Cell suspension cultures of Taxus canadensis and Taxus cuspidata rapidly produced paclitaxel (Taxol) and other taxoids in response to elicitation with methyl jasmonate. By optimizing the concentration of the elicitor, and the timing of elicitation, we have achieved the most rapid accumulation of

Cell cycle analysis of Taxus suspension cultures at the single cell level as an indicator of culture heterogeneity.

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Single cell growth and division was measured via flow cytometry in order to characterize the metabolic variability of Taxus cuspidata suspension cultures, which produce the valuable secondary metabolite Taxol. Good agreement was observed between the cell cycle distribution and biomass accumulation

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Herbal & Natural Medicine

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