2003 Fiscal Year Final Research Report Summary
Development of inhibitors for abscisic acid biosynthesis or catabolism
| Project/Area Number |
14560088
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Bioproduction chemistry/Bioorganic chemistry
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| Research Institution | RIKEN (The Institute of Physical and Chemical Research) |
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Principal Investigator |
ASAMI Tadao RIKEN (The Institute of Physical and Chemical Research), Plant Functions Laboratory, Senior Scientist, 植物機能研究室, 副主任研究員 (90231901)
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| Co-Investigator(Kenkyū-buntansha) |
NAKANO Takeshi RIKEN (The Institute of Physical and Chemical Research), Plant Functions Laboratory, Senior Research Scientist, 植物機能研究室, 先任研究員 (30281653)
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| Project Period (FY) |
2002 – 2003
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| Keywords | abscisic acid / dioxygenase / carotenoid cleaving enzyme / phaseic acid / catabolism enzyme / cytochrome P450 / triazole / plant hormones |
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| Research Abstract |
In higher plants, the ABA biosynthesis pathway involves the oxidative cleavage of 9-cis-epoxycarotenoids, which may be the key regulatory step in the pathway catalyzed by 9-cis-epoxycarotenoid dioxygenase (NCED). We developed a new inhibitor of ABA biosynthesis targeting NCED and named it abamine (abscisic acid biosynthesis inhibitor with an amine moiety). Abamine is a competitive inhibitor of NCED, with a K_i of 38.8 μM. In 0.4 M mannitol solution, which mimics the effects of osmotic stress, abamine both inhibited stomatal closure in spinach leaves, which was restored by co-application of ABA, and increased luminescence intensity in RD29B::LUC transgenic Arabidopsis. The ABA content of plants in 0.4 M mannitol was increased approximately 16-fold as compared with that of controls, whereas 50 to 100 μM abamine inhibited about 50% of this ABA accumulation in both spinach leaves and Arabidopsis. Abamine-treated Arabidopsis was more sensitive to drought stress and showed a significant decrease in drought tolerance than untreated Arabidopsis. These results suggest that abamine is a novel ABA biosynthesis inhibitor that targets the enzyme catalyzing oxidative cleavage of 9-cis-epoxycarotenoids. To test the effect of abamine on plants other than Arabidopsis, it was applied to cress plants. Abamine enhanced radicle elongation in cress seeds, which could be due to a decrease in the ABA content of abamine-treated plants. Thus, it is possible to think that abamine should enable us to elucidate the functions of ABA in cells or plants and to find new mutants involved in ABA signaling.
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[Publications] Han SY, Inoue H, Terada T, Kamoda S, Saburi Y, Sekimata K, Saito T, Kobayashi M, Shinozaki K, Yoshida S, Asami T: "Design and synthesis of lignostilbene-α,β-dioxygenase ; inhibitors."Bioorg Med Chem Lett. 12. 1139-1142 (2002)
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[Publications] Cheng WH, Endo A, Zhou L, Penney J, Chen HC, Arroyo A, Leon P, Nambara E, Asami T, Seo M, Koshiba T, Sheen J: "A unique short-chain dehydrogenase/reductase in Arabidopsis glucose signaling and abscisic acid biosynthesis and functions."Plant Cell. 14. 2723-2743 (2002)
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[Publications] Han SY, Inoue H, Terada T, Kamoda M, Saburi Y, Sekimata K, Saito T, Kobayashi M, Shinozaki K, Yoshida S, Asami T: "N-Benzylideneaniline and N-benzylaniline are potent inhibitors of lignostilbene-α,β-dioxygenase, a key enzyme in oxidative cleavage of the central double bond of lignostilbene."J Enzyme Inhibit Med Chem. 18. 279-283 (2003)
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