Abstract
In the mitochondria of animal steroidogenic tissues, cytochrome P450SCC encoded by the CYP11A1 gene catalyzes the conversion of cholesterol into pregnenolone—the general precursor of all steroid hormones. In this work we study the steroid metabolism in transgenic tobacco plants carrying the CYP11A1 cDNA encoding cytochrome P450SCC from the bovine adrenal cortex. The transgenic plants under investigation markedly surpass the control wild-type plants by size and are characterized by a shortened period of vegetative growth (by rapid flowering); their leaves contain pregnenolone—the product of a reaction catalyzed by cytochrome P450SCC. The level of progesterone in transgenic tobacco leaves is higher than in the control plants of the wild type. The seeds of the transgenic plants contain less (24R)-brassinosteroids than the wild-type tobacco plants. The results obtained indicate that the synthesis of an active P450SCC cytochrome in transgenic Nicotiana tabacum plants has a profound effect on steroid metabolism and is responsible for the specific phenotypic features of transgenic plants bearing CYP11A1 cDNA.
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Abbreviations
- 3β-HSD:
-
Δ5-hydroxysteroid dehydrogenase/Δ5-Δ4-ketosteroid isomerase
- 5αR:
-
steroid 5α-reductase
- mRNA:
-
messenger RNA
- RT-PCR:
-
reverse transcription coupled with polymerase chain reaction
- SCC:
-
side-chain cleavage
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Original Russian Text © S.G. Spivak, I.N. Berdichevets, R.P. Litvinovskaya, S.V. Drach, N.A. Kartel, G.V. Shpakovski, 2010, published in Bioorganicheskaya Khimiya, 2010, Vol. 36, No. 2, pp. 241–250.
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Spivak, S.G., Berdichevets, I.N., Litvinovskaya, R.P. et al. Some peculiarities of steroid metabolism in transgenic Nicotiana tabacum plants bearing the CYP11A1 cDNA of cytochrome P450SCC from the bovine adrenal cortex. Russ J Bioorg Chem 36, 224–232 (2010). https://doi.org/10.1134/S1068162010020123
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DOI: https://doi.org/10.1134/S1068162010020123