Dwarfism and cytochrome P450-mediated C-6 oxidation of plant steroid hormones

G. Bishop, T. Nomura, T. Yokota, T. Montoya, J. Castle, K. Harrison, T. Kushiro, Y. Kamiya, S. Yamaguchi, S. Bancos, A. M. Szatmári, M. Szekeres

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    BRs (brassinosteroids) are plant steroid hormones that are essential for normal plant development. The dramatic dwarfism exhibited by mutants in the CYP (cytochrome P450) enzymes involved in BR biosynthesis indicates a role for these hormones in plant growth and development. Since the mid-1990s, collaborative research has been geared towards developing a better understanding of the CYP85 class of CYPs involved in BR biosynthesis in both Arabidopsis and tomato. Some of the most recent observations include the fact that certain CYP85 CYPs catalyse the synthesis of the most bioactive BR, BL (brassinolide). Current evidence suggests that evolution of this function may have occurred independently in different dicotyledonous species. Interestingly, BL accumulates in tomato fruits, highlighting a key role for this hormone in fruit development. At the same time as developing a better understanding of the enzymatic function of these CYPs,we have also carried out experiments towards characterizingwhere andwhen these genes are expressed and mechanisms of their regulation. As expected for a hormone involved in growth and development, biosynthetic gene promoter activity is associated with young rapidly growing cells and with fruit development.

    Original languageEnglish
    Pages (from-to)1199-1201
    Number of pages3
    JournalBiochemical Society Transactions
    Issue number6
    Publication statusPublished - 2006 Dec 1


    • Arabidopsis
    • Brassinolide
    • Brassinosteroid
    • Cytochrome P450
    • Dwarfism
    • Plant steroid hormone

    ASJC Scopus subject areas

    • Biochemistry

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    Bishop, G., Nomura, T., Yokota, T., Montoya, T., Castle, J., Harrison, K., Kushiro, T., Kamiya, Y., Yamaguchi, S., Bancos, S., Szatmári, A. M., & Szekeres, M. (2006). Dwarfism and cytochrome P450-mediated C-6 oxidation of plant steroid hormones. Biochemical Society Transactions, 34(6), 1199-1201. https://doi.org/10.1042/BST0341199