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Activation of stress-response genes by retrograde signaling-mediated destabilization of nuclear importin IMPα-9 and its interactor TPR2

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Molecular Plant 2024年第6期17卷 884-899页

作者： Liping Zeng Maria Fernanda Gomez Mendez Jingzhe Guo Jishan Jiang Bailong Zhang Hao Chen Brandon Le Haiyan Ke katayoon dehesh Department of Botany and Plant Sciences Institute of Integrative Genome BiologyUniversity of CaliforniaRiversideRiversideCA 92521USA School of Medicine University of CaliforniaRiversideRiversideCA 92521USA

Stress-induced retrograde signal transmission from the plastids to the nucleus has long puzzled plant *** address this,we performed a suppressor screen of the ceh1 mutant,which contains elevated 2-C-methyl-d-erythritol-2,4-cyclopyrophosphate(MEcPP)levels,and identified the gain-of-function mutant impα-9,which shows reversed dwarfism and suppressed expression of stress-response genes in the ceh1 background despite heightened *** genetic and biochemical analyses established that the accumulation of MEcPP initiates an upsurge in Arabidopsis SKP1-like 1(ASK1)abundance,a pivotal component in the proteasome degradation *** increase in ASK1 prompts the degradation of IMPα-***,we uncovered a protein-protein interaction between IMPα-9 and TPR2,a transcriptional co-suppressor and found that a reduction in IMPα-9 levels coincides with a decrease in TPR2 ***,the interaction between IMPα-9 and TPR2 was disrupted in impα-9 mutants,highlighting the critical role of a single amino acid alteration in maintaining their *** of their interaction results in the reversal of MEcPP-associated *** immunoprecipitation coupled with sequencing analyses revealed that TPR2 binds globally to stress-response genes and suggested that IMPα-9 associates with the *** function together to suppress the expression of stress-response genes under normal conditions,but this suppression is alleviated in response to stress through the degradation of the suppressing *** biological relevance of our discoveries was validated under high light stress,marked by MEcPP accumulation,elevated ASK1 levels,IMPα-9 degredation,reduced TPR2 abundance,and subsequent activation of a network of stress-response *** summary,our study collectively unveils fresh insights into plant adaptive mechanisms,highlighting intricate interactions among retrograde signaling,the proteasome,and nuclear transport machinery.

关键词： plastidial retrograde signal MEcPP ASK1 impα-9 TPR2

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Determinants of timing and amplitude in the plant general stress response

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Journal of Integrative Plant Biology 2016年第2期58卷 119-126页

作者： Marta Bjornson Abhaya Dandekar katayoon dehesh Department of Plant Sciences University of California Department of Plant Biology University of California

Plants have evolved intricate signaling cascades to rapidly and effectively respond to biotic and abiotic challenges. The precise timing of these responses enables optimal resource reallocation to maintain the balance between stress adaptation and growth. Thus, an in-depth understanding of the immediate and long-term mechanisms regulating resource allocation is critical in deciphering how plants withstand environmental challenges. To date however, understanding of this tradeoff has focused on the amplitude of long-term responses, rather than the timing of rapid stress responses. This review presents current knowledge on kinetics of secondary messengers involved in regulation of rapid and general stress responses, followed by rapid stress responsive transduction machinery, and finally the transcriptional response of a functional general stress responsive cis-element. Within this context we discuss the role of timing of initial peak activation and later oscillating peak responses, and explore hormonal and stress signaling crosstalk confounding greater understanding of these cascades.

关键词： Calcium general stress response mitogen-activated protein kinase rapid stress response element reactive oxygen species nitric oxide timing

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Molecular Mechanisms Regulating Rapid Stress Signaling Networks in Arabidopsis

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Journal of Integrative Plant Biology 2010年第4期52卷 354-359页

作者： Justin W. Walley katayoon dehesh Department of Plant Biology University of California Division of Biological Sciences University of California

As sessile organisms plants must ronmental conditions. To survive cope with ever changing enviplants have evolved elaborate mechanisms to perceive and rapidly respond to a diverse range of abiotic and biotic stresses. Central to this response is the ability to modulate gene expression at both the transcriptional and posttranscriptional levels. This review will focus on recent progress that has been made towards understanding the rapid reprogramming of the transcriptome that occurs in response to stress as well as emerging mechanisms underpinning the reprogramming of gene expression in response to stress,

关键词： Molecular Mechanisms Regulating Rapid Stress Signaling Networks in Arabidopsis CAF

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ORA59 and EIN3 interaction couples jasmonate-ethylene synergistic action to antagonistic salicylic acid regulation of PDF expression

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Journal of Integrative Plant Biology 2017年第4期59卷 275-287页

作者： Xiang He Jishan Jiang Chang-Quan Wang katayoon dehesh Department of Botany and Plant Sciences and Institute of Integrative Genome Biology University of CaliforniaRiversideCalifornia 92506USA Rice Research Institute Sichuan Agricultural UniversityChengduSichuan 611130China Department of Ornamental Horticulture College of HorticultureNaniing Agricultural UniversityNanjing 210095China

Hormonal crosstalk is central for tailoring plant responses to the nature of challenges encountered. The role of antagonism between the two major defense hormones, salicylic acid （SA） and jasmonic acid （JA）, and modulation of this interplay by ethylene （ET） in favor of JA signaling pathway in plant stress responses is well recognized, but the underlying mechanism is not fully understood. Here, we show the opposing function of two transcription factors, ethylene insensitive3 （EIN3） and EIN3-Like1 （EIL1）, in SA-mediated suppression and JA- mediated activation of PLANT DEFENSINI.2 （PDFI.2）. This functional duality is mediated via their effect on protein, not transcript levels of the PDF1.2 transcriptional activator octadecanoid-responsive Arabidopsis59 （ORA59）. Specifically, JA induces ORA59 protein levels independently of EIN3/EIL1, whereas SA reduces the protein levels dependently of EIN3/EIL1. Co-infiltration assays revealed nuclear co-localization of ORA59 and EIN3, and split- luciferase together with yeast-two-hybrid assays established their physical interaction. The functional ramification of the physical interaction is EIN3-dependent degradation of ORA59 by the 26S proteasome. These findings allude to SA-responsive reduction of ORA59 levels mediated by EIN3 binding to and targeting of ORA59 for degrada4tion, thus nominating ORA59 pool as a coordination node for the antagonistic function of ET/JA and SA.

关键词： EIN ORA59 and EIN3 interaction couples jasmonate-ethylene synergistic action to antagonistic salicylic acid regulation of PDF expression PDF EIL acid

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Oxylipin Pathway in Rice and Arabidopsis

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Journal of Integrative Plant Biology 2007年第1期49卷 43-51页

作者： E. Wassim Chehab John V. Perea Banu Gopalan Steve Theg katayoon dehesh Section of Plant Biology University of California-Davis Davis CA 95616 USA

Plants have evolved complex signaling pathways to coordinate responses to developmental and environmental Information. The oxylipin pathway Is one pivotal lipid-based signaling network, composed of several competing branch pathways, that determines the plant＇s ability to adapt to various stimuli. Activation of the oxyllpln pathway Induces the de novo synthesis of biologically active metabolltes called ＂oxyllplns＂. The relative levels of these metabolltes are a distinct indicator of each plant species and determine the ability of plants to adapt to different stimuli. The two major branches of the oxyllpln pathway, allene oxide synthase （AOS） and hydroperoxlde lyase （HPL） are responsible for production of the signaling compounds, jasmonates and aldehydes respectively. Here, we compare and contrast the regulation of AOS and HPL branch pathways In rice and Arabidopsis as model monocotyledonous and dicotyledonous systems. These analyses provide new Insights Into the evolution of JAs and aldehydes signaling pathways, and the complex network of processes responsible for stress adaptations In monocots and dicots.

关键词： aldehydes allene oxide synthase Arabidopsis hydroperoxide lyase jasmonates oxylipin pathway rice

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Fatty acid-mediated transcriptional regulation of stress signaling pathway in plants

Fatty acid-mediated transcriptional regulation of stress sig...

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第十一届全国植物基因组学大会

作者： katayoon dehesh Plant Biology Department UC DavisUSA

Fatty acid structure affects cellular activities both through changes in membrane lipid composition and the generation of a diversity of bioactive derivatives,and the regulation of transcriptional activity. Eicosapoly...

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nitiation of ER Body Formation and Indole Glucosinolate Metabolism by the Plastidia Retrograde Signaling Metabolite, MEcPP

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Molecular Plant 2017年第11期10卷 1400-1416页

作者： Jin-Zheng Wang Baohua Li Yanmei Xiao Yu Ni Haiyan Ke Panyu Yang Amancio de Souza Marta Bjornson Xiang He Zhouxin Shen Gerd Ulrich Balcke Steve P. Briggs Alain Tissier Daniel J. Kliebenstein katayoon dehesh Institute for Integrative Genome Biology and Department of Botany and Plant Sciences University of California Riverside CA 92521 USA Department of Plant Biology University of California Davis CA 95616 USA Department of Plant Sciences University of California Davis CA 95616 USA Division of Biological Sciences University of California San Diego La Jolla CA 92093 USA Department of Cell and Metabolic Biology Leibniz-lnstitute of Plant Biochemistry Halle Germany Present address: College of Agronomy and Biotechnology Southwest University Chongqing P.R. China Present address: Rice Research Institute Sichuan Agricultural University Changdu Sichuan 611130 China

Plants have evolved tightly regulated signaling networks to respond and adapt to environmental perturbations, but the nature of the signaling hub（s） involved have remained an enigma. We have previously established that methylerythritol cyclodiphosphate （MEcPP）, a precursor of plastidial isoprenoids and a stress- specific retrograde signaling metabolite, enables cellular readjustments for high-order adaptive functions. Here, we specifically show that MEcPP promotes two Brassicaceae-specific traits, namely endoplasmic reticulum （ER） body formation and induction of indole glucosinolate （IGs） metabolism selectively, via tran- scriptional regulation of key regulators NAIl for ER body formation and MYB51/122 for IGs biosynthesis）. The specificity of MEcPP is further confirmed by the lack of induction of wound-inducible ER body genes as well as IGs by other altered methylerythritol phosphate pathway enzymes. Genetic analyses revealed MEcPP-mediated COil-dependent induction of these traits. Moreover, MEcPP signaling integrates the biosynthesis and hydrolysis of IGs through induction of nitrile-specifier protein1 and reduction of the sup- pressor, ESM1, and production of simple nitriles as the bioactive end product. The findings position the plastidial metabolite, MEcPP, as the initiation hub, transducing signals to adjust the activity of hard- wired gene circuitry to expand phytochemical diversity and alter the associated subcellular structure required for functionality of the secondary metabolites, thereby tailoring plant stress responses.

关键词： glucosinolates ER body retrograde signaling MEP pathway MEcPP stress

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Understanding Plant Development and Stress Responses through Integrative Approaches

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Journal of Integrative Plant Biology 2010年第4期52卷 350-353页

作者： Katie dehesh Chun-Ming Liu Issue Editor Department of Plant Biology University of California Davis USA Issue Editor Institute of Botany Chinese Academy of Sciences China

As the name reflects, integrative plant biology is the core topic of JIPB. In the past few years JIPB has been pursuing the development of this area, to assist the scientific community to bring together all possible research tools to understand plant growth, development and stress responses in micro- and macro-scales. As part of these efforts, JIPB and Yantai University organized the 1st International Symposium on Integrative Plant Biology in the seaside town of Yantai during August 10-12, 2009 （Figure 1） The symposium was co-sponsored by Botanical Society of China, Chinese Society for Cell Biology, Genetics Society of China, and Chinese Society for Plant Physiology.

关键词： Understanding Plant Development and Stress Responses through Integrative Approaches SDG gene As COI

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Intracellular Communication

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Molecular Plant 2014年第7期7卷 1071-1074页

作者： Bernhard Grimm, Kayatoon dehesh, Lixin Zhang Dario Leister Guest Editors

Gene expression of the nuclear, plastid, and mitochon- drial genomes in plants is mutually dependent and highly coordinately regulated. This ensures adequate synthesis of proteins functioning in common protein complexes for organellar gene expression and energy-transducing activities in chloroplasts and mitochondria. The concept of intracellular communication includes an anterograde and retrograde signaling network between nucleus and the two organelles, enabling this interactive exchange of information essential for cellular hemostasis. By definition, the intracellular communication is based on the inter-orga- nellar reciprocity whereby the transcriptional activities in the nucleus are regulated in part by signaling pathways derived from plastids and mitochondria （retrograde sign- aling）, while the organellar gene expression is controlled by information received form the nucleus （anterograde signaling）.

关键词： Gene expression plastid mitochondrial genomes

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Prevalence of cryptosporidiosis in animals in Iran: A systematic review and meta-analysis

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Asian Pacific Journal of Tropical Medicine 2021年第3期14卷 99-112页

作者： Mohammad Jokar Mohammad Hasan Rabiee Saied Bokaie Vahid Rahmanian Paria dehesh Hamideh Hasannejad Kiavash Hushmandi Hadi Keshipour Faculty of Veterinary Medicine Karaj BranchIslamic Azad UniversityKarajIran Divisions of Epidemiology Department of Food Hygiene and Quality ControlFaculty of Veterinary MedicineUniversity of TehranIran Zoonoses Research Center Jahrom University of Medical SciencesJahromIran Department of Epidemiology School of Public HealthIran University of Medical SciencesTehranIran

Objective:To review the prevalence of cryptosporidiosis among animal population of ***:Data were systematically gathered from 1 January 2000 to 1 January 2020 in the Islamic Republic of Iran from the following electronic databases:Pub Med,Springer,Google Scholar,Science Direct,Scopus,Web of Science,Magiran,and Scientific Information Database(SID).According to the preferred reporting items for systematic reviews and meta-analyses(PRISMA)and inclusion criteria,88 eligible studies were ***:The pooled prevalence of cryptosporidiosis using random and fixed effects model according to heterogeneity among animals was as follows:rodents 18.8%(95%CI 12.6%-25.0%),camels 17.1%(95%CI 8.6%-25.7%),cattle 16.8%(95%CI 13.4%-20.1%),goats 14.1%(95%CI 5.2%-23.0%),horses 12.2%(95%CI 8.3%-16.2%),birds 10.5%(95%CI 7.6%-13.4%),sheep 9.9%(95%CI 2.4%-4.9%),cats 8.8%(95%CI 4.8%-12.8%)and dogs 3.7%(95%CI 7.0%-12.8%).Conclusions:Cryptosporidiosis has been reported and present in a wide range of animals in Iran over the years and has a high prevalence in most of these species.

关键词： Cryptosporidiosis Animals Prevalence Iran

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