Plant Physiology最新文献

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Message hidden in α-helices – towards a better understanding of plant ABCG transporters’ multispecificity 隐藏在α-螺旋中的信息——更好地理解植物ABCG转运体的多特异性
IF 7.4 1区 生物学
Plant Physiology Pub Date : 2025-04-12 DOI: 10.1093/plphys/kiaf146
Wanda Biała-Leonhard, Aleksandra Bigos, Jan Brezovsky, Michał Jasiński
{"title":"Message hidden in α-helices – towards a better understanding of plant ABCG transporters’ multispecificity","authors":"Wanda Biała-Leonhard, Aleksandra Bigos, Jan Brezovsky, Michał Jasiński","doi":"10.1093/plphys/kiaf146","DOIUrl":"https://doi.org/10.1093/plphys/kiaf146","url":null,"abstract":"ABC transporters are ubiquitous in all organisms and constitute one of the largest protein families. The substantial expansion of this family in plants coincided with the emergence of fundamental novelties that facilitated successful adaptation to a sessile lifestyle on land. It also resulted in selectivity and multispecificity toward endogenous molecules observed for certain ABC transporters. Understanding the molecular determinants behind this intriguing feature remains an ongoing challenge for the functional characterization of these proteins. This review synthesizes current achievements and methodologies that enhance our mechanistic understanding of how ABCG transporters, which are particularly numerous in land plants, specifically recognize and transport endogenous compounds. We examine in silico modeling and the recent advancements in the structural biology of ABCGs. Furthermore, we highlight internal and external factors that potentially influence the substrate selectivity of those proteins. Ultimately, this review contributes to rationalizing our current capacity to fully understand how plants orchestrate membrane transport fulfilled by these proteins.","PeriodicalId":20101,"journal":{"name":"Plant Physiology","volume":"27 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Jasmonic acid signaling and glutathione coordinate plant recovery from high light stress 茉莉酸信号和谷胱甘肽协调植物从强光胁迫中恢复
IF 7.4 1区 生物学
Plant Physiology Pub Date : 2025-04-10 DOI: 10.1093/plphys/kiaf143
Mehmet Kılıç, Peter J Gollan, Eva-Mari Aro, Eevi Rintamäki
{"title":"Jasmonic acid signaling and glutathione coordinate plant recovery from high light stress","authors":"Mehmet Kılıç, Peter J Gollan, Eva-Mari Aro, Eevi Rintamäki","doi":"10.1093/plphys/kiaf143","DOIUrl":"https://doi.org/10.1093/plphys/kiaf143","url":null,"abstract":"High light (HL)-induced chloroplast retrograde signaling originates from the photosynthetic apparatus and regulates nuclear gene expression to enhance photoprotection and coordination of cell metabolism. Here, we analyzed the transcript profiles and accumulation of ROS, stress hormones, and small molecule antioxidants to investigate the signaling mechanisms operating under HL stress, particularly during plant recovery under growth light condition. Exposure of Arabidopsis (Arabidopsis thaliana) rosettes to HL for 15 min induced several 1O2- and H2O2-responsive genes and accumulation of an oxidized form of glutathione, the hallmarks of oxidative stress in cells. Prolonged exposure to HL resulted in accumulation of transcripts encoding oxylipin biosynthesis enzymes, leading to accumulation of 12-oxo-phytodienoic acid and jasmonic acid. However, the expression of several jasmonic acid-responsive genes, already induced by HL, peaked during the recovery, together with accumulation of jasmonic acid and reduced glutathione and ascorbate, highlighting the critical role of jasmonic acid signaling in restoring chloroplast redox balance following HL stress. The involvement of jasmonic acid signaling in recovery-sustained gene expression was further confirmed via experiments with jasmonic acid receptor mutants. HL exposure of only 2 min was sufficient to induce some recovery-sustained genes, indicating the rapid response of plants to changing light conditions. We propose that ROS production at HL induces the signaling cascade for early oxylipin biosynthesis and 12-oxo-phytodienoic acid accumulation, while increased accumulation of jasmonic acid in the recovery phase activates genes that fully restore the glutathione metabolism, ultimately allowing recovery from short-term HL stress.","PeriodicalId":20101,"journal":{"name":"Plant Physiology","volume":"34 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143813755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
MYB80 and TEK: Dynamic duo regulating callose wall degradation and pollen exine development. MYB80和TEK:调节胼胝质壁降解和花粉外壁发育的动态组合。
IF 7.4 1区 生物学
Plant Physiology Pub Date : 2025-04-10 DOI: 10.1093/plphys/kiaf147
Nilesh D Gawande
{"title":"MYB80 and TEK: Dynamic duo regulating callose wall degradation and pollen exine development.","authors":"Nilesh D Gawande","doi":"10.1093/plphys/kiaf147","DOIUrl":"https://doi.org/10.1093/plphys/kiaf147","url":null,"abstract":"","PeriodicalId":20101,"journal":{"name":"Plant Physiology","volume":"4 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The transcription factor DAL1 links age to reproductive development via regulation of LEAFY homologs in conifers 在针叶树中,转录因子DAL1通过调节叶类同源物将年龄与生殖发育联系起来
IF 7.4 1区 生物学
Plant Physiology Pub Date : 2025-04-10 DOI: 10.1093/plphys/kiaf139
Yi-Tong Song, Shuang-Wei Liu, Jing-Jing Ma, Xi Chen, Feng-Yi Li, Pei-Yi Wang, Fang-Xu Han, Shi-Hui Niu
{"title":"The transcription factor DAL1 links age to reproductive development via regulation of LEAFY homologs in conifers","authors":"Yi-Tong Song, Shuang-Wei Liu, Jing-Jing Ma, Xi Chen, Feng-Yi Li, Pei-Yi Wang, Fang-Xu Han, Shi-Hui Niu","doi":"10.1093/plphys/kiaf139","DOIUrl":"https://doi.org/10.1093/plphys/kiaf139","url":null,"abstract":"Age-dependent reproductive development is pivotal for plant adaptability and for species perpetuation. While substantial progress has been made in elucidating age-related regulatory mechanisms in angiosperms, the molecular basis of how aging pathway interacts with reproductive development in gymnosperms, particularly conifers, remains elusive. Here, we demonstrate that DEFICIENS-AGAMOUS-LIKE 1 (DAL1), an age marker protein in conifers, binds to and activates two LEAFY (LFY) homologs, PtLEAFY (PtLFY) and PtNEEDLY (PtNLY), in Pinus tabuliformis. Furthermore, PtLFY and PtNLY directly regulate class B and C MADS-box genes, which are essential for specifying reproductive organ identity. Notably, PtLFY exerts a stronger regulatory effect on downstream class B and C genes compared to PtNLY, suggesting potential functional divergence between these two paralogous genes. This study reveals a PtDAL1-mediated regulatory cascade that links aging to reproductive development in conifers. These findings provide insights into the evolutionary conservation and divergence of the reproduction-associated regulatory networks across plant lineages, broadening our understanding of the genetic and molecular mechanisms underlying the reproductive development of gymnosperms.","PeriodicalId":20101,"journal":{"name":"Plant Physiology","volume":"21 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143813754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The transcription factors PIF4 and PIF5 interact with WRINKLED1 to modulate fatty acid biosynthesis during seed maturation. 转录因子PIF4和PIF5与褶皱1相互作用,调节种子成熟过程中脂肪酸的生物合成。
IF 7.4 1区 生物学
Plant Physiology Pub Date : 2025-04-10 DOI: 10.1093/plphys/kiaf141
Huimei Liao,Bojing Feng,Mengrui Wen,Chang Du,Xiaoqing Zhong,Qiuchan Lu,Guanping Gong,Jianhai Mo,Huizi Huang,Shengchun Zhang,Ruihua Huang
{"title":"The transcription factors PIF4 and PIF5 interact with WRINKLED1 to modulate fatty acid biosynthesis during seed maturation.","authors":"Huimei Liao,Bojing Feng,Mengrui Wen,Chang Du,Xiaoqing Zhong,Qiuchan Lu,Guanping Gong,Jianhai Mo,Huizi Huang,Shengchun Zhang,Ruihua Huang","doi":"10.1093/plphys/kiaf141","DOIUrl":"https://doi.org/10.1093/plphys/kiaf141","url":null,"abstract":"PHYTOCHROME-INTERACTING FACTORS (PIFs), members of the basic helix-loop-helix (bHLH) transcription factor (TF) family, regulate various developmental processes in Arabidopsis (Arabidopsis thaliana). However, their involvement in fatty acid biosynthesis and seed maturation is largely unknown. WRINKLED1 (WRI1) is a pivotal TF regulating plant fatty acid biosynthesis. In this study, we identified WRI1 as an interacting partner of PIF4 and PIF5. PIF4 and PIF5, similar to WRI1, are expressed during seed maturation. Over-expressing PIF4 or PIF5 triggers increased seed fatty acid biosynthesis, while loss-of-function pif4 and pif5 mutants exhibit reduced seed fatty acid biosynthesis and delayed seed maturation. Further analysis revealed that PIF4 and PIF5 promote WRI1-dependent expression of fatty acid biosynthesis genes. Together, our findings suggest that PIF4 and PIF5 interact with WRI1, thereby promoting fatty acid biosynthesis gene expression and increasing fatty acid biosynthesis. This study reports a previously uncharacterized regulatory mechanism that fine-tunes seed fatty acid biosynthesis and seed maturation.","PeriodicalId":20101,"journal":{"name":"Plant Physiology","volume":"60 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Conducting environmental impact assessment in agricultural system to comprehensively understand the field 开展农业系统环境影响评价,全面了解该领域
IF 7.4 1区 生物学
Plant Physiology Pub Date : 2025-04-10 DOI: 10.1093/plphys/kiaf148
Jianling Fan, Ling Li, Cuiying Liu, Chao Pan, Yingping Mo, Hongyan Zhang
{"title":"Conducting environmental impact assessment in agricultural system to comprehensively understand the field","authors":"Jianling Fan, Ling Li, Cuiying Liu, Chao Pan, Yingping Mo, Hongyan Zhang","doi":"10.1093/plphys/kiaf148","DOIUrl":"https://doi.org/10.1093/plphys/kiaf148","url":null,"abstract":"Agricultural environmental impact assessment provides potential measures to mitigate negative impacts, would help plant scientists broaden their view of the agricultural system.","PeriodicalId":20101,"journal":{"name":"Plant Physiology","volume":"4 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143813455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
OsHDAC1 deacetylates the aldehyde dehydrogenase OsALDH2B1, repressing OsGR3 and decreasing salt tolerance in rice OsHDAC1 可使醛脱氢酶 OsALDH2B1 去乙酰化,从而抑制 OsGR3 并降低水稻的耐盐性
IF 7.4 1区 生物学
Plant Physiology Pub Date : 2025-04-10 DOI: 10.1093/plphys/kiaf149
Yequn Wu, Jiaqi Hou, Huangzhuo Xiao, Shiqi Ye, Daoyi Tu, Ronghua Qiu, Xiaoci Ma, Yating Zhao, Tingyu Chen, Lijia Li
{"title":"OsHDAC1 deacetylates the aldehyde dehydrogenase OsALDH2B1, repressing OsGR3 and decreasing salt tolerance in rice","authors":"Yequn Wu, Jiaqi Hou, Huangzhuo Xiao, Shiqi Ye, Daoyi Tu, Ronghua Qiu, Xiaoci Ma, Yating Zhao, Tingyu Chen, Lijia Li","doi":"10.1093/plphys/kiaf149","DOIUrl":"https://doi.org/10.1093/plphys/kiaf149","url":null,"abstract":"Salt stress poses a significant challenge to the growth and productivity of rice (Oryza sativa L.). Histone deacetylases (HDACs) play a vital role in modulating responses to various abiotic stresses. However, how OsHDAC1 responds to salt stress remains largely unknown. Here, we report that OsHDAC1 decreases salt tolerance in rice through post-translational modification of metabolic enzymes. Specifically, the rice OsHDAC1 RNAi lines exhibited enhanced resilience to salt stress, while plants overexpressing OsHDAC1 were notably more sensitive. OsHDAC1 interacts with the aldehyde dehydrogenase (ALDH) OsALDH2B1 and deacetylates it at K311 and K531, triggering ubiquitin-proteasome-mediated degradation of OsALDH2B1. OsALDH2B1 can directly target OsGR3, which encodes a type of glutathione reductase critical for reactive oxygen species (ROS) scavenging. Compared with wild-type plants, OsALDH2B1-overexpressing plants exhibited higher OsGR3 expression levels and increased salt resistance, whereas OsALDH2B1 RNAi lines showed reduced OsGR3 expression and lower salt resistance. Collectively, our data suggest that salt stress down-regulates OsHDAC1, resulting in an increase in the acetylation level of OsALDH2B1, which in turn stabilizes OsALDH2B1 and promotes its activity in the regulation of OsGR3 transcription. This OsHDAC1/OsALDH2B1/OsGR3 regulatory module represents an alternative pathway for governing salt stress adaptation in rice.","PeriodicalId":20101,"journal":{"name":"Plant Physiology","volume":"62 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143819030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A VqMAPK4-VqGT3-VqNSTS6 module regulates powdery mildew resistance via stilbene biosynthesis in Chinese wild grapevine VqMAPK4-VqGT3-VqNSTS6 模块通过二苯乙烯生物合成调控中国野生葡萄的白粉病抗性
IF 7.4 1区 生物学
Plant Physiology Pub Date : 2025-04-08 DOI: 10.1093/plphys/kiaf140
Wandi Liu, Chaohui Yan, Zhi Li, Ruimin Li, Guotian Liu, Yuejin Wang
{"title":"A VqMAPK4-VqGT3-VqNSTS6 module regulates powdery mildew resistance via stilbene biosynthesis in Chinese wild grapevine","authors":"Wandi Liu, Chaohui Yan, Zhi Li, Ruimin Li, Guotian Liu, Yuejin Wang","doi":"10.1093/plphys/kiaf140","DOIUrl":"https://doi.org/10.1093/plphys/kiaf140","url":null,"abstract":"Grapes are widely cultivated around the world and valued for their rich nutritional content and versatile use in various industries. However, grape powdery mildew (PM) threatens grape production. This study aimed to identify and characterize PM resistance genes in Chinese wild grapevine (Vitis quinquangularis). Grape powdery mildew resistance is associated with stilbene synthases (STSs). Here, we isolated VqNSTS6 from the Chinese wild grapevine accession ‘Danfeng-2’ that exhibits high PM resistance. Overexpression of VqNSTS6 in the susceptible ‘Thompson Seedless’ variety induced PM resistance, whereas its transient knockdown in ‘Danfeng-2’ diminished this resistance. Furthermore, VqNSTS6 expression was upregulated by VqGT3, resulting in stilbene accumulation and enhanced PM resistance. However, stilbene overaccumulation induced Mitogen-Activated Protein Kinase 4 (MAPK4) phosphorylation, which in turn triggered VqGT3 phosphorylation and degradation, consequently downregulating VqNSTS6 and mitigating excessive stilbene accumulation. Additionally, VqNSTS6-GFP moved toward and wrapped around pathogen haustoria, forming a barrier preventing Golovinomyces cichoracearum invasion of Arabidopsis (Arabidopsis thaliana). The characterization of the STS gene VqNSTS6 conferring PM resistance opens avenues for breeding PM-resistant grapevine genotypes.","PeriodicalId":20101,"journal":{"name":"Plant Physiology","volume":"59 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143813760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The thylakoid membrane remodeling protein VIPP1 forms bundled oligomers in tobacco chloroplasts 类囊体膜重塑蛋白VIPP1在烟草叶绿体中形成束状低聚物
IF 7.4 1区 生物学
Plant Physiology Pub Date : 2025-04-08 DOI: 10.1093/plphys/kiaf137
Sarah W Gachie, Alexandre Muhire, Di Li, Akihiro Kawamoto, Noriko Takeda-Kamiya, Yumi Goto, Mayuko Sato, Kiminori Toyooka, Ryo Yoshimura, Tsuneaki Takami, Lingang Zhang, Genji Kurisu, Toru Terachi, Wataru Sakamoto
{"title":"The thylakoid membrane remodeling protein VIPP1 forms bundled oligomers in tobacco chloroplasts","authors":"Sarah W Gachie, Alexandre Muhire, Di Li, Akihiro Kawamoto, Noriko Takeda-Kamiya, Yumi Goto, Mayuko Sato, Kiminori Toyooka, Ryo Yoshimura, Tsuneaki Takami, Lingang Zhang, Genji Kurisu, Toru Terachi, Wataru Sakamoto","doi":"10.1093/plphys/kiaf137","DOIUrl":"https://doi.org/10.1093/plphys/kiaf137","url":null,"abstract":"The thylakoid membrane (TM) serves as the scaffold for oxygen-evolving photosynthesis, hosting the protein complexes responsible for the light reactions and ATP synthesis. Vesicle Inducing Protein in Plastid 1 (VIPP1), a key protein in TM remodeling, has been recognized as essential for TM homeostasis. In vitro studies of cyanobacterial VIPP1 demonstrated its ability to form large homo-oligomers (> 2 MDa) manifesting as ring-like or filament-like assemblies associated with membranes. Similarly, VIPP1 in Chlamydomonas reinhardtii assembles into rods that encapsulate liposomes or into stacked spiral structures. However, the nature of VIPP1 assemblies in chloroplasts, particularly in Arabidopsis, remains uncharacterized. Here, we expressed Arabidopsis thaliana VIPP1 fused to GFP (AtVIPP1-GFP) in tobacco (Nicotiana tabacum) chloroplasts and performed transmission electron microscopy (TEM). A purified AtVIPP1-GFP fraction was enriched with long filamentous tubule-like structures. Detailed TEM observations of chloroplasts in fixed resin-embedded tissues identified VIPP1 assemblies in situ that appeared to colocalize with GFP fluorescence. Electron tomography demonstrated that the AtVIPP1 oligomers consisted of bundled filaments near membranes, some of which appeared connected to the TM or inner chloroplast envelope at their contact sites. The observed bundles were never detected in wild-type Arabidopsis but were observed in Arabidopsis vipp1 mutants expressing AtVIPP1-GFP. Taken together, we propose that the bundled filaments are the dominant AtVIPP1 oligomers that represent its static state in vivo.","PeriodicalId":20101,"journal":{"name":"Plant Physiology","volume":"38 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Diphthamide formation in Arabidopsis requires DPH1-interacting DPH2 for light and oxidative stress resistance 拟南芥中二甲氰胺的形成需要dph1与DPH2相互作用以抵抗光和氧化胁迫
IF 7.4 1区 生物学
Plant Physiology Pub Date : 2025-04-07 DOI: 10.1093/plphys/kiaf128
Hongliang Zhang, Nadežda Janina, Koray Ütkür, Thirishika Manivannan, Lei Zhang, Lizhen Wang, Christopher Grefen, Raffael Schaffrath, Ute Krämer
{"title":"Diphthamide formation in Arabidopsis requires DPH1-interacting DPH2 for light and oxidative stress resistance","authors":"Hongliang Zhang, Nadežda Janina, Koray Ütkür, Thirishika Manivannan, Lei Zhang, Lizhen Wang, Christopher Grefen, Raffael Schaffrath, Ute Krämer","doi":"10.1093/plphys/kiaf128","DOIUrl":"https://doi.org/10.1093/plphys/kiaf128","url":null,"abstract":"Diphthamide is a post-translationally modified histidine residue of eukaryotic TRANSLATION ELONGATION FACTOR 2 (eEF2) and the target of diphtheria toxin in human cells. In yeast and mammals, the 4Fe-4S cluster-containing proteins Dph1 and Dph2 catalyze the first biosynthetic step of diphthamide formation. Here, we identify Arabidopsis (Arabidopsis thaliana) DPH2 and show that it is required for diphthamide biosynthesis, localizes to the cytosol and interacts physically with AtDPH1. Arabidopsis dph2 mutants form shorter primary roots and smaller rosettes than the wild type, similar to dph1 mutants which we characterized previously. Additionally, increased ribosomal -1 frameshifting error rates and attenuated TARGET OF RAPAMYCIN (TOR) kinase activity in dph2 mutants also phenocopy the dph1 mutant. Beyond the known heavy-metal hypersensitivity and heat shock tolerance of dph1, we show here that both dph1 and dph2 mutants are hypersensitive to elevated light intensities and oxidative stress, and that wild-type Arabidopsis seedlings accumulate diphthamide-unmodified eEF2 under oxidative stress. Both mutants share the deregulation of 1,186 transcripts associated with several environmental and hormone responses. AtDPH1 and AtDPH2 do not complement the corresponding mutants of Saccharomyces cerevisiae. In summary, DPH2 and DPH1 interact to function inter-dependently in diphthamide formation, the maintenance of translational fidelity, wild-type growth rates and TOR kinase activation, and they contribute to mitigating damage from elevated light intensities and oxidative stress. Under oxidative stress, a dose-dependent loss of diphthamide could potentiate downstream effects in a feed-forward loop. This work advances our understanding of translation and its interactions with growth regulation and stress responses in plants.","PeriodicalId":20101,"journal":{"name":"Plant Physiology","volume":"10 2 1","pages":""},"PeriodicalIF":7.4,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143805711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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