Functional characterization of CYP71D443, a cytochrome P450 catalyzing C-22 hydroxylation in the 20-hydroxyecdysone biosynthesis of Ajuga hairy roots
Abstract
20-Hydroxyecdysone (20HE), a molting hormone of insects, is also distributed among a variety of plant families. 20HE is thought to play a role in protecting plants from insect herbivores. In insects, biosynthesis of 20HE from cholesterol proceeds via 7-dehydrocholesterol and 3β,14α-dihydroxy-5β-cholest-7-en-6-one (5β-ketodiol), the latter being converted to 20HE through sequential hydroxylation catalyzed by four P450 enzymes, which have been cloned and identified. In contrast, little is known about plant 20HE biosynthesis, and no biosynthetic 20HE gene has been reported thus far. We recently proposed involvement of 3β-hydroxy-5β-cholestan-6-one (5β-ketone) in 20HE biosynthesis in the hairy roots of Ajuga reptans var. atropurpurea (Lamiaceae). In this study, an Ajuga EST library was generated from the hairy roots and P450 genes were deduced from the library. Five genes with a high expression level (CYP71D443, CYP76AH19, CYP76AH20, CYP76AH21 and CYP716D27) were screened for a possible involvement in 20HE biosynthesis. As a result, CYP71D443 was shown to have C-22 hydroxylation activity for the 5β-ketone substrate using a yeast expression system. The hydroxylated product, 22-hydroxy-5β-ketone, had a 22R configuration in agreement with that of 20HE. Furthermore, labeling experiments indicated that (22R)-22-hydroxy-5β-ketone was converted to 20HE in Ajuga hairy roots. Based on the present results, a possible 20HE biosynthetic pathway in Ajuga plants involved CYP71D443 is proposed.
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Most enzymes of ecdysteroid biosynthesis, except 14α-hydroxylase and 22-hydroxylase, have been identified only in insects/arthropods.
“Moreover, most of the enzymes, except 14α-hydroxylase [179] and 22-hydroxylase [36], have been identified only in insects/arthropods.”
From Ecdysteroids (2021) · cites this paper as [36]
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- Authors
- Tsukagoshi, Y., Ohyama, K., Seki, H., Akashi, T., Muranaka, T., Suzuki, H., & Fujimoto, Y.
- Affiliations
- Tokyo Institute of Technology (JP)
- The University of Osaka (JP)
- Nihon University (JP)
- Kazusa DNA Research Institute (JP)
- Corresponding author
- Fujimoto, Yoshinori
- Venue
- Phytochemistry
- Publisher
- Elsevier BV
- Published
- 2016-07
- Volume
- 127
- Pages
- 23-28
- ISSN
- 0031-9422 (ISSN-L)
- OpenAlex
- W2310379724
- Cited by
- 27
- References
- 44
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 2 · 2023: 3 · 2022: 3 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 5 · 2016: 1
- FWCI
- 1.39
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Phytochemistry (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Ministry of Education, Culture, Sports, Science and Technology
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Plant biochemistry and biosynthesis
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Plant tissue culture and regeneration
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
- Keywords
- 20-hydroxyecdysone, cytochrome P450, hairy roots, ecdysteroid biosynthesis, insect molting hormone, yeast expression system, stereochemistry
- MeSH terms
- Cholestanones, Cholesterol, Cytochrome P-450 Enzyme System, Dehydrocholesterols, Ecdysterone, Molecular Structure, Plant Roots, Cytochrome P-450 CYP1A1, Lamiaceae, Ecdysteroids, Ajuga
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