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Light-stabilized FHA2 suppresses miRNA biogenesis through interactions with DCL1 and HYL1

Molecular Plant 2021年第4期14卷 647-663页

作者： Seung Jun Park Suk Won Choi Gu Min Kim christian moller Hyun-Sook Pai Seong Wook Yang Department of Systems Biology College of Life Science and BiotechnologyYonsei UniversitySeoul 120749Korea EDepartment of Systems Biology Institute of Life Science and BiotechnologyYonsei UniversitySeoul 120-749Korea Department of Plant and Environnental Sciences Faculty of ScienceUniversity of CopenhagenThorvaldsensvei 40DK-1871 FrederiksbergCopenhagenDenmark Pohang University of Science and Technology(POSTECH) 77 Cheongam-RoNam-GuPohangGyeongbuk37673.Korea These authors contributed equally to this article.

The precise regulation of microRNA(miRNA)biogenesis is crucial for plant development,which requires core microprocessors and many fine tuners to coordinate their miRNA processing activity/specificity in fluctuating cellular *** de-etiolation,light triggers a dramatic accumulation of core microprocessors and primary miRNAs(pri-miRNAs)but decreases pri-miRNA processing activity,resulting in relatively constant miRNA *** mechanisms underlying these seemingly contradictory regulatory changes remain *** this study,we identified forkhead-associated domain 2(FHA2)as a light-stabilized suppressor of miRNA *** found that FHA2 deficiency increased the level of mature miRNAs,accompanied by a reduction in pri-miRNAs and target *** assays showed that FHA2 associates with the core microprocessors DCL1,HYL1,and SE,forming a complex to suppress their pri-miRNA processing *** analyses revealed that FHA2 promotes HYL1 binding but inhibits the binding of DCL1-PAZ-RNase-RNA-binding domains(DCL1-PRR)to miRNAs,whereas FHA2 does not directly bind to these ***,we found that FHA2 protein is unstable in the dark but stabilized by light during ***,disruption of FH A led to defects in light-triggered changes in miRNA expression and reduced the survival rate of deetiolated seedlings after prolonged light ***,these data suggest that FHA2 is a novel light-stabilized suppressor of miRNA biogenesis and plays a role in fine-tuning miRNA processing during de-etiolation.

关键词： miRNA biogenesis Suppressor of the microprocessor miRNA-biogenetic inconsistency

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Complex Regulation of Prolyl-4-Hydroxylases Impacts Root Hair Expansion

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Molecular Plant 2015年第5期8卷 734-746页

作者： Silvia M. Velasauez Martiniano M. Ricardi christian Peter Poulsen Ai Oikawa Adiphol Dilokpimol Adnan Halim Silvina Mangano Silvina Paola Denita Juarez Eliana Marzol Juan D. Salgado Salter Javier Gloazzo Dorosz Cecilia Borassi Svenning Rune moller Rafael Buono Yukiko Ohsawa Ken Matsuoka Marisa S. Otegui Henrik V. Scheller Naomi Geshi Bent Larsen Petersen Norberto D. lusem Jose M. Estevez Instituto de Fisiologfa Biologia Molecular y Neurociencias (IFIBYNE-CONICET) Facultad de Ciencias Exactas y Naturales Universidad de Buenos AiresBuenos Aires C1428EGA Argentina VKR Research Centre Department of Plant and Environmental Sciences University of Copenhagen DK-1871 Frededksberg C Denmark Joint BioEnergy Institute Feedstocks Division Lawrence Berkeley National Laboratory 5885 Hollis Street Emeryville CA 94608 USA Copenhagen Center for Glycomios Department of Cellular and Molecular Faculty of Health and Medical Sciences University of CopenhagenDK-2200 Copenhagen N Denmark Department of Botany University of Wisconsin Madison WI 53706 USA RIKEN Plant Science Center Tsurumi-ku Yokohama 230-0045 Japan Laboratory of Plant Nutrition Faculty of Agriculture Kyushu University Hakozaki 6-10-1 Higashi-ku Fukuoka 812-8581 Japan Departamento de Fisiologia Biologia Molecular y Celular Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires Buenos Aires C1428EGAArgentina These authors contributed equally to the article. Present address: Fungal Physiology CBS-KNAW Fungal Biodiversity Center Uppsalalaan 8 Utrecht 3584 CT The Netherlands Present address: The Danish Stem Cell Center The Panum Institute Blegdamsvej 3B DK-2200 Copenhagen Denmark

Root hairs are single cells that develop by tip growth, a process shared with pollen tubes, axons, and fungal hyphae. However, structural plant cell walls impose constraints to accomplish tip growth. In addition to polysaccharides, plant cell walls are composed of hydroxyproline-rich glycoproteins （HRGPs）, which include several groups of O-glycoproteins, including extensins （EXTs）. Proline hydroxylation, an early post-translational modification （PTM） of HRGPs catalyzed by prolyl 4-hydroxylases （P4Hs）, defines their subsequent O-glycosylation sites. In this work, our genetic analyses prove that P4H5, and to a lesser extent P4H2 and P4H13, are pivotal for root hair tip growth. Second, we demonstrate that P4H5 has in vitro preferred specificity for EXT substrates rather than for other HRGPs. Third, by P4H promoter and protein swapping approaches, we show that P4H2 and P4H13 have interchangeable functions but cannot replace P4H5. These three P4Hs are shown to be targeted to the secretory pathway, where P4H5 forms dimers with P4H2 and P4H13. Finally, we explore the impact of deficient proline hydroxylation on the cell wall architec- ture. Taken together, our results support a model in which correct peptidyl-proline hydroxylation on EXTs, and possibly in other HRGPs, is required for proper cell wall self-assembly and hence root hair elongation in Arabidopsis thaliana.

关键词： enzymology cell expansion cell walls protein targeting proline hydroxylation root hairs

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术中二维相干光断层扫描作为前节手术的一个新工具

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美国医学会眼科杂志（中文版） 2005年第4期17卷 221-224,255页

作者： Gerd Geerling Maya Müller christian Winter Hans Hoerauf Stefan Oelckers Horst Laqua Reginald Birngruber 李晓宁（译）任泽钦（校） Department of Ophthalmology Medical University of Labeck Labeck Germany 4optics Lübeck Germany moller-Wedel Wedel Germany Medical Laser Center Lübeck Germany 不详

我们测试了1310nm相干光断层扫描仪与手术显微镜前部镜头的分光镜连接后对前节手术过程中术中的非接触性成像。这项对相干光断层成像技术的新改进可完成前节手术术中角膜、巩膜的高分辨率横断面的成像与厚度测量。其在板层切开技术如深... 详细信息

我们测试了1310nm相干光断层扫描仪与手术显微镜前部镜头的分光镜连接后对前节手术过程中术中的非接触性成像。这项对相干光断层成像技术的新改进可完成前节手术术中角膜、巩膜的高分辨率横断面的成像与厚度测量。其在板层切开技术如深层前板层角膜移植术和小梁切除术中尤为有用。

关键词：断层扫描仪手术过程相干光术中前板层角膜移植术断层成像技术工具二维手术显微镜非接触性

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