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Coordinated regulation of the mitochondrial retrograde response by circadian clock regulators and ANAC017

Plant Communications 2023年第1期4卷 250-271页

作者： Yanqiao Zhu Reena Narsai Cunman He Yan Wang Oliver Berkowitz James Whelan Lim Chee Liew College of Life Science Zhejiang UniversityHangzhouZhejiang 310058P.R.China Department of Animal Plant and Soil ScienceARC Centre of Excellence in Plant Energy BiologyLa Trobe UniversityBundooraVIC 3086Australia

Mitochondrial retrograde signaling(MRS)supports photosynthetic function under a variety of conditions.Induction of mitochondrial dysfunction with myxothiazol(a specific inhibitor of the mitochondrial bc1 complex)or antimycin A(an inhibitor of the mitochondrial bc1 complex and cyclic electron transport in the chloroplast under light conditions)in the light and dark revealed diurnal control of MRS.This was evidenced by(1)significantly enhanced binding of ANAC017 to promoters in the light compared with the dark in Arabidopsis plants treated with myxothiazol(but not antimycin A),(2)overlap in the experimentally determined binding sites for ANAC017 and circadian clock regulators in the promoters of ANAC013 and AOX1a,(3)a diurnal expression pattern for ANAC017 and transcription factors it regulates,(4)altered expression of ANAC017-regulated genes in circadian clock mutants with and without myxothiazol treatment,and(5)a decrease in the magnitude of LHY and CCA1 expression in an ANAC017-overexpressing line and protein–protein interaction between ANAC017 and PIF4.This study also shows a large difference in transcriptome responses to antimycin A and myxothiazol in the dark:these responses are ANAC017 independent,observed in shoots and roots,similar to biotic challenge and salicylic acid responses,and involve ERF and ZAT transcription factors.This suggests that antimycin A treatment stimulates a second MRS pathway that is mediated or converges with salicylic acid signaling and provides a merging point with chloroplast retrograde signaling.

关键词： mitochondria chloroplast retrograde signaling diurnal circadian clock ANAC017

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An update on the function and regulation of methylerythritol phosphate and mevalonate pathways and their evolutionary dynamics

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Journal of Integrative Plant Biology 2021年第7期63卷 1211-1226页

作者： Xiaojun Pu Xiumei Dong Qing Li Zexi Chen Li Liu State Key Laboratory of Biocatalysis and Enzyme Engineering Hubei Collaborative Innovation Center for Green Transformation of BioResourcesHubei Key Laboratory of Industrial BiotechnologySchool of Life SciencesHubei UniversityWuhan 434200China Key Laboratory for Economic Plants and Biotechnology Kunming Institute of Botanythe Chinese Academy of Sciencesand Yunnan Key Laboratory for Wild Plant ResourcesKunming 650201China School of Life Sciences Yunnan UniversityKunming 650091China University of the Chinese Academy of Sciences Beijing 100049China

Isoprenoids are among the largest and most chemically diverse classes of organic compounds in nature and are involved in the processes of photosynthesis, respiration, growth, development,and plant responses to stress. The basic building block units for isoprenoid synthesis-isopentenyl diphosphate and its isomer dimethylallyl diphosphate-are generated by the mevalonate (MVA) and methylerythritol phosphate(MEP) pathways. Here, we summarize recent advances on the roles of the MEP and MVA pathways in plant growth, development and stress responses, and attempt to define the underlying gene networks that orchestrate the MEP and MVA pathways in response to developmental or environmental cues.Through phylogenomic analysis, we also provide a new perspective on the evolution of the plant isoprenoid pathway. We conclude that the presence of the MVA pathway in plants may be associated with the transition from aquatic to subaerial and terrestrial environments, as lineages for its core components are absent in green algae. The emergence of the MVA pathway has acted as a key evolutionary event in plants that facilitated land colonization and subsequent embryo development, as well as adaptation to new and varied environments.

关键词： evolutionary innovation MEP pathway MVA pathway retrograde signaling stress

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Inactivation of Mitochondrial Complex Ⅰ Induces the Expression of a Twin Cysteine Protein that Targets and Affects Cytosolic, Chloroplastidic and Mitochondrial Function

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Molecular Plant 2016年第5期9卷 696-710页

作者： Yan Wang Wenhui Lyu Oliver Berkowitz Jordan D. Radomiljac Simon R. Law Monika W. Murcha Chris Carrie Pedro F. Teixeira Beata Kmiec Owen Duncan Olivier Van Aken Reena Narsai Elzbieta Glaser Shaobai Huang Ute Roessner A. Harvey Millar James Whelan Department of Animal Plant and Soil Science Australian Research Council Centre of Excellence in Plant Energy Biology School of Life Science La Trobe University Bundoora VIC 3086 Australia Ume(a)Plant Science Centre(UPSC) Faculty of Science and Technology Ume(a)University Ume(a) Sweden Australian Research Council Centre of Excellence in Plant Energy Biology University of Western Australia 35 Stirling Highway Crawley WA 6009 Australia Department of Biology I Botany Ludwig-Maximilians-Universitat Munchen Groβhaderner Strasse 2-4 82152 Planegg-Martinsried Germany Department of Biochemistry and Biophysics Stockholm University Atrhenius Laboratories for Natural Sciences 10691 Stockholm Sweden School of BioSciences The University of Melbourne Melbourne VIC 3010 Australia

At12Cys-1 （At5g64400） and At12Cys-2 （At5g09570） are two closely related isogenes that encode small, twin cysteine proteins, typically located in mitochondria. At12Cys-2 transcript is induced in a variety of mutants with disrupted mitochondrial proteins, but an increase in At12Cys protein is only detected in mutants with reduced mitochondrial complex I abundance. Induction of At12Cys protein in mutants that lack mitochondrial complex I is accompanied by At12Cys protein located in mitochondria, chloroplasts, and the cytosoh Biochemical analyses revealed that even single gene deletions, i.e., At12cys-1 orAtl2cys-2, have an effect on mitochondrial and chloroplast functions. However, only double mutants, i.e., At12cys-1：At12cys.2, affect the abundance of protein and mRNA transcripts encoding translation elongation factors as well as rRNA abundance. Blue native PAGE showed that At12Cys co-migrated with mitochondrial supercomplex I ＋ lU. Likewise, deletion of both At12cys-1 and At12cys-2 genes, but not single gene deletions, results in enhanced tolerance to drought and light stress and increased anti-oxidant capacity. The induction and multiple localization of At12Cys upon a reduction in complex I abundance provides a mechanism to specifically signal mitochondrial dysfunction to the cytosol and then beyond to other organelles in the cell.

关键词： mitochondria complex I retrograde signaling chloroplast cytosol

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The Translational Apparatus of Plastids and Its Role in Plant Development

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Molecular Plant 2014年第7期7卷 1105-1120页

作者： Nadine Tiller Ralph Bock Max-Planck-Institut for Molekulare Pflanzenphysiologie Am Muhlenberg 1 D-14476 Potsdam-Golm Germany

Chloroplasts （plastids） possess a genome and their own machinery to express it. Translation in plastids occurs on bacterial-type 70S ribosomes utilizing a set of tRNAs that is entirely encoded in the plastid genome. In recent years, the components of the chloroplast translational apparatus have been intensely studied by proteomic approaches and by reverse genetics in the model systems tobacco （plastid-encoded components） and Arabidopsis （nucleus-encoded components）. This work has provided important new insights into the structure, function, and biogenesis of chloroplast ribosomes, and also has shed fresh light on the molecular mechanisms of the translation process in plastids. In addition, mutants affected in plastid translation have yielded strong genetic evidence for chloroplast genes and gene products influencing plant develop- ment at various levels, presumably via retrograde signaling pathway（s）. In this review, we describe recent progress with the functional analysis of components of the chloroplast translational machinery and discuss the currently available evidence that supports a significant impact of plastid translational activity on plant anatomy and morphology.

关键词： plastid translation ribosome ribosomal protein evolution plastid transformation retrograde signaling leaf development palisade cell.

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Identification of Target Genes and Transcription Factors Implicated in Translation-Dependent retrograde Sig- naling in Arabidopsis

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Molecular Plant 2014年第7期7卷 1228-1247页

作者： Dario Leister Isidora Romani Lukas Mittermayr Francesca Paieri Elena Fenino Tatjana Kleine Plant Molecular Biology (Botany) Department Biology I Ludwig-Maximilians-University Munich Gro0haderner Str. 2 D-82152Martinsried Germany

Changes in organellar gene expression （OGE） trigger retrograde signaling. The molecular dissection of OGE-dependent retrograde signaling based on analyses of mutants with altered OGE is complicated by compensatory responses that mask the primary signaling defect and by secondary effects that influence other retrograde signaling pathways. Therefore, to identify the earliest effects of altered OGE on nuclear transcript accumulation, we have induced OGE defects in adult plants by ethanol-dependent repression of PRORS1, which encodes a prolyl-tRNA synthetase located in chloroplasts and mitochondria. After 32 h of PRORS1 repression, the translational capacity of chloroplasts was reduced, and this effect subsequently intensified, while basic photosynthetic parameters were still unchanged at 51 h. Analysis of changes in whole-genome transcriptomes during exposure to ethanol revealed that induced PRORS1 silencing affects the expression of 1020 genes in all. Some of these encode photosynthesis-related proteins, including several down-regulated light-harvesting chlorophyll a/b binding （LHC） proteins. Interestingly, genes for presumptive endoplasmic reticulum pro- teins are transiently up-regulated. Furthermore, several NAC-domain-containing proteins are among the transcription factors regulated. Candidate cis-acting elements which may coordinate the transcriptional co-regulation of genes sets include both G-box variants and sequence motifs with no similarity to known plant c/s-elements.

关键词： Arabidopsis chloroplast mitochondrion retrograde signaling target genes transcription factors cis-elements.

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