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On improving strigolactone mimics for induction of suicidal germination of the root parasitic plant Striga hermonthica

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aBIOTECH 2021年第1期2卷 1-13页

作者： Ikuo takahashi Kosuke Fukui Tadao asami Graduate School of Agricultural and Life Sciences The University of TokyoTokyo 113-8657Japan

Strigolactones(SLs)are plant hormones that regulate the branching of plants and seed germination stimulants of root parasitic *** root parasites are a great threat to agricultural production,the use of SL agonists could be anticipated to provide an efficient method for regulating root parasites as suicidal germination inducers.A series of phenoxyfuranone-type SL mimics,termed debranones,has been reported to show potent bioactivities,including reduction of the tiller number on rice,and stimulation of seed germination in the root parasite Striga *** exert both activities,two substituents on the phenyl ring of the molecules were important but at least a substituent at the 2-position must be an electron-withdrawing ***,little is known about the effect of the properties of the substituents at the 2-position on ***,we found that different substituents at the 2-position give different preferences for *** debranones were more effective than the others and SL agonist GR24 for inhibiting rice tiller but far less effective in the induction of *** ***,nitrile and methyl derivatives clearly stimulated the germination of *** *** their IC_(50) values were 100 times higher than that of GR24 in the receptor competitive binding assay,their physiological activities were approximately 1/10 of *** differences could be due to their uptake in plants and/or their physicochemical stability under our experimental *** findings could support the design of more potent and selective SL agonists that could contribute to solving big agricultural issues.

关键词： Agonist Rice Root parasitic weed Seed germination Strigolactone Tillering

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普林斯顿大学路易斯艺术中心美国新泽西州,普林斯顿

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世界建筑导报 2020年第5期35卷 39-43页

作者：史蒂文·霍尔 RA Noah Yaffe Christina Yessios Jongseo Lee Nathan Rich Whitney Forward Chris McVoy Martin Kropac Scott Fredricks Alfonso Simelio Arseni Timofejev Michael Haddy Yasmin Vobis Zach Cohen Jing Han Laetitia Buchter Ying Yi Cai Gary He asami takahashi Ebbie Wisecarver 史蒂文·霍尔建筑师事务所

新建的路易斯艺术中心位于校园南端,毗邻麦卡特剧院。配备了崭新的最先进的设施,大幅度扩展艺术表演、彩排及教学空间,将普林斯顿大学的艺术教育提升到更高的维度。这座综合体大楼创建了一个新的校园入口,重新塑造了校园空间,同时最大... 详细信息

新建的路易斯艺术中心位于校园南端,毗邻麦卡特剧院。配备了崭新的最先进的设施,大幅度扩展艺术表演、彩排及教学空间,将普林斯顿大学的艺术教育提升到更高的维度。这座综合体大楼创建了一个新的校园入口,重新塑造了校园空间,同时最大限度地提升了多孔性与活跃度。该项目由斯蒂文•霍尔建筑事务所和BNIM事务所合作设计,集合了舞蹈、戏剧、音乐剧和普林斯顿大学工作室,并为音乐学院扩建的新音乐大楼增设了教学和研究配置。建筑群体包含华莱士舞蹈大楼及剧院;由赫尔利画廊、行政办公室和其他工作室组成的艺术大楼;以及新音乐大楼。三幢大楼聚集在一个占地8,000平方英尺(约743平方米)的开放性室内大厅,作为艺术活动的主要场所。大厅之上是一个有着倒影水池的室外广场,自然光透过水池映射到底下的大厅中。

关键词：普林斯顿大学建筑事务所建筑群体教学空间赫尔利工作室校园空间美国新泽西州

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Triazole Ureas Covalently Bind to Strigolactone Receptor and Antagonize Strigolactone Responses

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Molecular Plant 2019年第1期12卷 44-58页

作者： Hidemitsu Nakamura Kei Hirabayashi Takuya Miyakawa Ko Kikuzato Wenqian Hu Yuqun Xu Kai Jiang Ikuo takahashi Ruri Niiyama Naoshi Dohmae Masaru Tanokura Tadao asami Graduate School of Agricultural and Life Sciences The University of Tokyo1-1-1 YayoiBunkyo-kuTokyo 113-8657Japan ar Characterization Unit RIKEN Center for Sustainable Resource ScienceWakoSaitamaJapan Department of Biochemistry Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia

Strigolactones,a class of plant hormones with multiple functions,mediate plant-plant and plantmicroorganism communications in the *** this study,we developed potent strigolactone antagonists,which covalently bindto the strigolactone receptor D14,by preparing an array of triazole urea *** yeast two-hybrid and rice-tillering assays,we identified a triazole urea compound KK094 as a potent inhibitor of strigolactone *** chromatography-tandem mass spectrometry analysis and X-ray crystallography revealed that KK094 was hydrolyzed by D14,and that a reaction product of this degradation covalently binds to the Ser residue of the catalytic triad of ***,we identified two triazole urea compounds KK052 and KK073,whose effects on D14-D53/D14-SLR1 complex formation were opposite due to the absence (KK052)or presence (KK073)of a trifluoromethyl group on their phenyl *** results demonstrate that triazole urea compounds are potentially powerful tools for agricultural application and may be useful for the elucidation of the complicated mechanism underlying strigolactone perception.

关键词： strigolactone covalent antagonist triazole urea crystal structure

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Efficient Mimics for Elucidating Zaxinone Biology and Promoting Agricultural Applications

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Molecular Plant 2020年第11期13卷 1654-1661页

作者： Jian You Wang Muhammad Jamil Pei-Yu Lin Tsuyoshi Ota Valentina Fiorilli Mara Novero Randa A.Zarban Boubacar AKountche Ikuo takahashi Claudio Martinez Luisa Lanfranco Paola Bonfante Angel R.de Lera Tadao asami Salim Al-Babili King Abdullah University of Science and Technology Division of Biological and Environmental Science and Engineeringthe BioActives LabThuwal 23955-6900Saudi Arabia Graduate School of Agricultural and Life Sciences The University of TokyoTokyoJapan Department of Life Sciences and Systems Biology University of TorinoTorinoItaly Universidade de Vigo Facultade de Quimica and CINBIOVigoSpain

Zaxinone is an apocarotenoid regulatory metabolite required for normal rice growth and *** addition,zaxinone has a large application potential in agriculture,due to its growth-promoting activity and capability to alleviate infestation by the root parasitic plant Striga through decreasing strigolactone(SL)***,zaxinone is poorly accessible to the scientific community because of its laborious organic synthesis that impedes its further investigation and *** this study,we developed easy-to-synthesize and highly efficient mimics of zaxinone(MiZax).We performed a structure-activity relationship study using a series of apocarotenoids distinguished from zaxinone by different structural *** the obtained results,we designed several phenyl-based compounds synthesized with a high-yield through a simple *** tests showed that MiZax3 and MiZax5 exert zaxinone activity in rescuing root growth of a zaxinone-deficient rice mutant,promoting growth,and reducing SL content in roots and root exudates of wild-type ***,these compounds were at least as efficient as zaxinone in suppressing transcript level of SL biosynthesis genes and in alleviating Striga infestation under greenhouse conditions,and did not negatively impact *** together,MiZax are a promising tool for elucidating zaxinone biology and investigating rice development,and suitable candidates for combating Striga and increasing crop growth.

关键词： apocarotenoids zaxinone zaxinone mimics strigolactone Striga root parasitic plants

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