Baccatin III - CAS 27548-93-2
Catalog number: B0005-465215
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Baccatin III is a tetracyclic diterpenoid isolated from the barks of Taxus yunnanensis. It can be used as an intermediate in the synthesis of paclitaxel.
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B0005-465215 250 mg $198 In stock
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(2aR,4S,4aS,6R,9S,11S,12S,12aR,12bS)-6,12b-Bis(acetyloxy)-12-(benzoyloxy)-1,2a,3,4,4a,6,9,10,11,12,12a,12b-dodecahydro-4,9,11-trihydroxy-4a,8,13,13-tetramethyl-7,11-methano-5H-cyclodeca[3,4]benz[1,2-b]oxet-5-one; NSC 330753; Paclitaxel Impurity N
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1.Differential regulation of mitogen-activated protein kinases by microtubule-binding agents in human breast cancer cells.
Shtil AA;Mandlekar S;Yu R;Walter RJ;Hagen K;Tan TH;Roninson IB;Kong AN Oncogene. 1999 Jan 14;18(2):377-84.
Drug design targeted at microtubules has led to the advent of some potent anti-cancer drugs. In the present study, we demonstrated that microtubule-binding agents (MBAs) taxol and colchicine induced immediate early gene (c-jun and ATF3) expression, cell cycle arrest, and apoptosis in the human breast cancer cell line MCF-7. To elucidate the signal transduction pathways that mediate such biological activities of MBAs, we studied the involvement of mitogen-activated protein (MAP) kinases. Treatment with taxol, colchicine, or other MBAs (vincristine, podophyllotoxin, nocodazole) stimulated the activity of c-jun N-terminal kinase 1 (JNK1) in MCF-7 cells. In contrast, p38 was activated only by taxol and none of the MBAs changed the activity of extracellular signal-regulated protein kinase 2 (ERK2). Activation of JNK1 or p38 by MBAs occurred subsequent to the morphological changes in the microtubule cytoskeleton induced by these compounds. Furthermore, baccatine III and beta-lumicolchicine, inactive analogs of taxol and colchicine, respectively, did not activate JNKI or p38. These results suggest that interactions between microtubules and MBAs are essential for the activation of these kinases.
2.13C NMR investigation of solid-state polymorphism in 10-deacetyl baccatin III.
Harper JK;Facelli JC;Barich DH;McGeorge G;Mulgrew AE;Grant DM J Am Chem Soc. 2002 Sep 4;124(35):10589-95.
To investigate the origins of solid-state NMR shift differences in polymorphs, carbon NMR chemical shift tensors are measured for two forms of solid 10-deacetyl baccatin III: a dimethyl sulfoxide (DMSO) solvate and an unsolvated form. A comparison of ab initio computed tensors that includes and omits the DMSO molecules demonstrates that lattice interactions cannot fully account for the shift differences in the two forms. Instead, conformational differences in the cyclohexenyl, benzoyl, and acetyl moieties are postulated to create the differences observed. X-ray analysis of six baccatin III analogues supports the suggested changes in the cyclohexenyl and benzoyl systems. The close statistical match of the (13)C chemical shifts of both polymorphic forms with those calculated using the X-ray geometry of 10-deacetyl baccatin III supports the contention that the B, C, and D rings are fairly rigid. Therefore, the observed tensor differences appear to arise primarily from conformational variations in ring substituents and the cyclohexenyl ring.
3.Changes in gene transcription and taxane production in elicited cell cultures of Taxus × media and Taxus globosa.
Ramirez-Estrada K;Osuna L;Moyano E;Bonfill M;Tapia N;Cusido RM;Palazon J Phytochemistry. 2015 Sep;117:174-84. doi: 10.1016/j.phytochem.2015.06.013. Epub 2015 Jun 16.
The response of two Taxus cell systems to the action of cyclodextrin (CD) and coronatine (CORO), supplied to the culture medium either separately or together, was studied. Two-stage Taxus globosa and Taxus media cell cultures were established and the elicitors were added at the beginning of the second stage. Growth, taxane production, and the expression of known taxol biosynthetic genes, including the recently characterized CoA ligase gene, were studied. Although CORO reduced the growth capacity of both cell lines, CD apparently counteracted this negative effect. Taxane production was significantly enhanced by the simultaneous addition of CD and CORO to the medium. The total taxane production in the T. media cell line was more than double that of T. globosa, but in the latter more than 90% of the taxanes produced were excreted to the medium. Individual taxane patterns also differed: at the height of production, the main taxanes in T. globosa cultures were cephalomannine and 10-deacetyltaxol, and in T. media, taxol and baccatin III. The low transcript levels of taxane biosynthetic genes found in T. globosa cells mirrored the lower taxane production in these cultures, while a high expression was strongly correlated with a high taxane production in T.
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CAS 27548-93-2 Baccatin III

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