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Zhang H, Wu J, Fu D, Zhang M, Wang L, Gong M. Prokaryotic expression, purification, and the in vitro and in vivo protection study of dehydrin WDHN2 from Triticum aestivum. PROTOPLASMA 2024; 261:771-781. [PMID: 38342804 DOI: 10.1007/s00709-024-01933-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Accepted: 01/28/2024] [Indexed: 02/13/2024]
Abstract
Dehydrins proteins accumulate and play important protective roles in most plants during abiotic stresses. The objective of this study was to characterize a YSK2-type dehydrin gene, WDHN2, isolated from Triticum aestivum previously. In this work, wheat dehydrin WDHN2 was expressed in Escherichia coli and purified by immobilized metal affinity chromatography, which exhibited as a single band by sodium dodecyl sulfonate polyacrylamide gel electrophoresis and western blotting. We show that WDHN2 is capable of alleviating lactate dehydrogenase inactivation from heat and desiccation in vitro enzyme activity protection assay. In vivo assay of Escherichia coli viability demonstrates the enhancement of cell survival by the overexpression of WDHN2. The protein aggregation prevention assay explores that WDHN2 has a broad protective effect on the cellular proteome. The results show that WDHN2 is mainly accumulated in the nucleus and cytosol, suggesting that this dehydrin may exert its function in both cellular compartments. Our data suggest that WDHN2 acts as a chaperone molecular in vivo.
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Affiliation(s)
- Hongmei Zhang
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, 471023, Henan, China
- Key Laboratory of Microbial Resources Exploitation and Utilization, Henan University of Science and Technology, Luoyang, 471023, Henan, China
| | - Jiafa Wu
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, 471023, Henan, China
- Key Laboratory of Microbial Resources Exploitation and Utilization, Henan University of Science and Technology, Luoyang, 471023, Henan, China
| | - Dandan Fu
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, 471023, Henan, China
| | - Min Zhang
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, 471023, Henan, China
| | - Lunji Wang
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, 471023, Henan, China
| | - Minggui Gong
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, 471023, Henan, China.
- Key Laboratory of Microbial Resources Exploitation and Utilization, Henan University of Science and Technology, Luoyang, 471023, Henan, China.
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Szlachtowska Z, Rurek M. Plant dehydrins and dehydrin-like proteins: characterization and participation in abiotic stress response. FRONTIERS IN PLANT SCIENCE 2023; 14:1213188. [PMID: 37484455 PMCID: PMC10358736 DOI: 10.3389/fpls.2023.1213188] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 06/12/2023] [Indexed: 07/25/2023]
Abstract
Abiotic stress has a significant impact on plant growth and development. It causes changes in the subcellular organelles, which, due to their stress sensitivity, can be affected. Cellular components involved in the abiotic stress response include dehydrins, widely distributed proteins forming a class II of late embryogenesis abundant protein family with characteristic properties including the presence of evolutionarily conserved sequence motifs (including lysine-rich K-segment, N-terminal Y-segment, and often phosphorylated S motif) and high hydrophilicity and disordered structure in the unbound state. Selected dehydrins and few poorly characterized dehydrin-like proteins participate in cellular stress acclimation and are also shown to interact with organelles. Through their functioning in stabilizing biological membranes and binding reactive oxygen species, dehydrins and dehydrin-like proteins contribute to the protection of fragile organellar structures under adverse conditions. Our review characterizes the participation of plant dehydrins and dehydrin-like proteins (including some organellar proteins) in plant acclimation to diverse abiotic stress conditions and summarizes recent updates on their structure (the identification of dehydrin less conserved motifs), classification (new proposed subclasses), tissue- and developmentally specific accumulation, and key cellular activities (including organellar protection under stress acclimation). Recent findings on the subcellular localization (with emphasis on the mitochondria and plastids) and prospective applications of dehydrins and dehydrin-like proteins in functional studies to alleviate the harmful stress consequences by means of plant genetic engineering and a genome editing strategy are also discussed.
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Szabała BM. The cationic nature of lysine-rich segments modulates the structural and biochemical properties of wild potato FSK 3 dehydrin. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2023; 194:480-488. [PMID: 36512982 DOI: 10.1016/j.plaphy.2022.11.039] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 11/23/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Dehydrins are hydrophilic stress-induced proteins that are thought to protect cellular machinery from the adverse effect of dehydration caused by low temperature, drought, or salinity. In the previous study, acidic FSK3 dehydrin DHN24 from Solanum sogarandinum was found to accumulate at multiple sites in phloem cells in response to cold treatment. This study investigated the biochemical and structural properties of recombinant DHN24. It was shown that the overexpression of DHN24 in Escherichia coli led to the inhibition of bacterial growth. The purified DHN24 was found to protect lactate dehydrogenase from freeze-induced denaturation. Circular dichroism (CD) analysis showed that DHN24 was disordered in aqueous solutions, but adopted α-helical conformation in a membrane-mimetic environment using sodium dodecyl sulfate micelles. DHN24 also interacted with anionic phosphatidic acid (PA). DHN24 contains four lysine-rich regions including three K-segments and a region upstream of the S-segment. The role of their local cationic nature is unknown. These segments are predicted to form helical structures. The CD analysis of mutant proteins in the membrane-mimetic environment matched these predictions most closely, revealing that the positively charged lysine residues in these regions promoted disorder-to-order transitions. Moreover, the inhibition of bacterial growth and interactions with PA were regulated by the local cationic nature of DHN24, while no such regulation was observed for its cryoprotective activity. The importance of the positive charge of the lysine-rich segments and disordered structure for DHN24 activity is discussed in relation to its possible biological function.
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Affiliation(s)
- Bartosz M Szabała
- Institute of Plant Genetics, Polish Academy of Sciences, Strzeszyńska 34, 60-479, Poznań, Poland; Institute of Biology, Department of Genetics, Breeding and Plant Biotechnology, Warsaw University of Life Sciences (SGGW), Nowoursynowska 166 St., 02-787, Warsaw, Poland.
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A YSK-Type Dehydrin from Nicotiana tabacum Enhanced Copper Tolerance in Escherichia coli. Int J Mol Sci 2022; 23:ijms232315162. [PMID: 36499485 PMCID: PMC9737620 DOI: 10.3390/ijms232315162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 11/25/2022] [Accepted: 11/26/2022] [Indexed: 12/04/2022] Open
Abstract
Copper is an essential micronutrient for the maintenance of normal cell function but is toxic in excess. Dehydrins are group two late embryogenesis abundant proteins, which facilitate plant survival in harsh environmental conditions. Here, a YSK-type dehydrin, NtDhn17, was cloned from Nicotiana tabacum under copper toxicity and characterized using a heterologous expression system and in vitro or in vivo experiments and exhibited characteristics of intrinsic disorder during in vitro analyses. Heterologous expression of NtDHN17 enhanced the tolerance of E. coli to various metals, osmotic, and oxidative stress. NtDHN17 showed no Cu2+-binding properties in vivo or in vitro, indicating that metal ion binding is not universal among dehydrins. In vitro and in vivo experiments suggested that NtDHN17 behaved as a potent anti-aggregation agent providing strong protection to aggregated proteins induced by excess copper ions, an effect dependent on the K-segment but not on the Y- or S-segments. In summary, the protective role of NtDHN17 towards E. coli under conditions of copper toxicity may be related to anti-aggregation ability rather than its acting as an ion scavenger, which might be a valuable target for the genetic improvement of resistance to heavy metal stresses in plants.
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Physiological and omics analysis of maize inbred lines during late grain development. Genes Genomics 2022; 44:993-1006. [PMID: 35771389 DOI: 10.1007/s13258-022-01279-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 06/11/2022] [Indexed: 11/04/2022]
Abstract
BACKGROUND There were significant differences in the change of moisture content and grain composition at the late stage of grain development among different maize varieties, but the regulation mechanism is not clear. OBJECTIVE To explore the key genes causing the variation in physiological traits of two typical maize inbred lines in late grain development. METHODS The grains at different development stages were selected as materials to determine the content of water, sucrose, starch and ABA. Transcriptomic and proteomic analysis of the materials were performed to screen relevant genes. RESULTS The grain dehydration rate and the content of sucrose, starch and ABA were showed significant differences between two varieties in the late stage of grain development. The enrichment analysis of common differentially expressed genes (proteins) showed that most of the genes (proteins) were enriched in the extracellular region. The downregulated genes were mainly concentrated in carbohydrate metabolism and lipid metabolism, while the upregulated genes were mainly in response to stress. Furthermore, this study also identified many key candidate genes (dehydrin genes, pathogenesis-related genes, sucrose synthase and secondary metabolites related genes) related to late grain development of maize. CONCLUSIONS The suggested genes related to late grain development of maize can be candidates for further functional study.
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The Halophyte Dehydrin Sequence Landscape. Biomolecules 2022; 12:biom12020330. [PMID: 35204830 PMCID: PMC8869203 DOI: 10.3390/biom12020330] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/14/2022] [Accepted: 02/17/2022] [Indexed: 12/04/2022] Open
Abstract
Dehydrins (DHNs) belong to the LEA (late embryogenesis abundant) family group II, that comprise four conserved motifs (the Y-, S-, F-, and K-segments) and are known to play a multifunctional role in plant stress tolerance. Based on the presence and order of these segments, dehydrins are divided into six subclasses: YnSKn, FnSKn, YnKn, SKn, Kn, and KnS. DHNs are rarely studied in halophytes, and their contribution to the mechanisms developed by these plants to survive in extreme conditions remains unknown. In this work, we carried out multiple genomic analyses of the conservation of halophytic DHN sequences to discover new segments, and examine their architectures, while comparing them with their orthologs in glycophytic plants. We performed an in silico analysis on 86 DHN sequences from 10 halophytic genomes. The phylogenetic tree showed that there are different distributions of the architectures among the different species, and that FSKn is the only architecture present in every plant studied. It was found that K-, F-, Y-, and S-segments are highly conserved in halophytes and glycophytes with a few modifications, mainly involving charged amino acids. Finally, expression data collected for three halophytic species (Puccinillia tenuiflora, Eutrema salsugenium, and Hordeum marinum) revealed that many DHNs are upregulated by salt stress, and the intensity of this upregulation depends on the DHN architecture.
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Abdul Aziz M, Sabeem M, Mullath SK, Brini F, Masmoudi K. Plant Group II LEA Proteins: Intrinsically Disordered Structure for Multiple Functions in Response to Environmental Stresses. Biomolecules 2021; 11:1662. [PMID: 34827660 PMCID: PMC8615533 DOI: 10.3390/biom11111662] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 11/01/2021] [Accepted: 11/04/2021] [Indexed: 11/16/2022] Open
Abstract
In response to various environmental stresses, plants have evolved a wide range of defense mechanisms, resulting in the overexpression of a series of stress-responsive genes. Among them, there is certain set of genes that encode for intrinsically disordered proteins (IDPs) that repair and protect the plants from damage caused by environmental stresses. Group II LEA (late embryogenesis abundant) proteins compose the most abundant and characterized group of IDPs; they accumulate in the late stages of seed development and are expressed in response to dehydration, salinity, low temperature, or abscisic acid (ABA) treatment. The physiological and biochemical characterization of group II LEA proteins has been carried out in a number of investigations because of their vital roles in protecting the integrity of biomolecules by preventing the crystallization of cellular components prior to multiple stresses. This review describes the distribution, structural architecture, and genomic diversification of group II LEA proteins, with some recent investigations on their regulation and molecular expression under various abiotic stresses. Novel aspects of group II LEA proteins in Phoenix dactylifera and in orthodox seeds are also presented. Genome-wide association studies (GWAS) indicated a ubiquitous distribution and expression of group II LEA genes in different plant cells. In vitro experimental evidence from biochemical assays has suggested that group II LEA proteins perform heterogenous functions in response to extreme stresses. Various investigations have indicated the participation of group II LEA proteins in the plant stress tolerance mechanism, spotlighting the molecular aspects of group II LEA genes and their potential role in biotechnological strategies to increase plants' survival in adverse environments.
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Affiliation(s)
- Mughair Abdul Aziz
- Integrative Agriculture Department, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (M.A.A.); (M.S.)
| | - Miloofer Sabeem
- Integrative Agriculture Department, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (M.A.A.); (M.S.)
| | - Sangeeta Kutty Mullath
- Department of Vegetable Science, College of Agriculture, Kerala Agricultural University, Thrissur 680656, India;
| | - Faical Brini
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax (CBS), University of Sfax, B.P 1177, Sfax 3018, Tunisia;
| | - Khaled Masmoudi
- Integrative Agriculture Department, College of Agriculture and Veterinary Medicine, United Arab Emirates University, Al Ain 15551, United Arab Emirates; (M.A.A.); (M.S.)
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Upadhyaya G, Das A, Basu C, Agarwal T, Basak C, Chakraborty C, Halder T, Basu G, Ray S. Multiple copies of a novel amphipathic α-helix forming segment in Physcomitrella patens dehydrin play a key role in abiotic stress mitigation. J Biol Chem 2021; 296:100596. [PMID: 33781743 PMCID: PMC8100072 DOI: 10.1016/j.jbc.2021.100596] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 03/23/2021] [Accepted: 03/25/2021] [Indexed: 12/01/2022] Open
Abstract
Plants use a diverse set of proteins to mitigate various abiotic stresses. The intrinsically disordered protein dehydrin is an important member of this repertoire of proteins, characterized by a canonical amphipathic K-segment. It can also contain other stress-mitigating noncanonical segments—a likely reflection of the extremely diverse nature of abiotic stress encountered by plants. Among plants, the poikilohydric mosses have no inbuilt mechanism to prevent desiccation and therefore are likely to contain unique noncanonical stress-responsive motifs in their dehydrins. Here we report the recurring occurrence of a novel amphipathic helix-forming segment (D-segment: EGφφD(R/K)AKDAφ, where φ represents a hydrophobic residue) in Physcomitrella patens dehydrin (PpDHNA), a poikilohydric moss. NMR and CD spectroscopic experiments demonstrated the helix-forming tendency of the D-segment, with the shuffled D-segment as control. PpDHNA activity was shown to be size as well as D-segment dependent from in vitro, in vivo, and in planta studies using PpDHNA and various deletion mutants. Bimolecular fluorescence complementation studies showed that D-segment-mediated PpDHNA self-association is a requirement for stress abatement. The D-segment was also found to occur in two rehydrin proteins from Syntrichia ruralis, another poikilohydric plant like P. patens. Multiple occurrences of the D-segment in poikilohydric plant dehydrins/rehydrins, along with the experimental demonstration of the role of D-segment in stress abatement, implies that the D-segment mediates unique resurrection strategies, which may be employed by plant dehydrins that are capable of mitigating extreme stress.
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Affiliation(s)
- Gouranga Upadhyaya
- Plant Functional Genomics Laboratory, Department of Botany, University of Calcutta, Kolkata, India
| | - Arup Das
- Plant Functional Genomics Laboratory, Department of Botany, University of Calcutta, Kolkata, India
| | | | - Tanushree Agarwal
- Plant Functional Genomics Laboratory, Department of Botany, University of Calcutta, Kolkata, India
| | - Chandra Basak
- Plant Functional Genomics Laboratory, Department of Botany, University of Calcutta, Kolkata, India
| | - Chandrima Chakraborty
- Plant Functional Genomics Laboratory, Department of Botany, University of Calcutta, Kolkata, India
| | - Tanmoy Halder
- Plant Functional Genomics Laboratory, Department of Botany, University of Calcutta, Kolkata, India
| | - Gautam Basu
- Department of Biophysics, Bose Institute, Kolkata, India
| | - Sudipta Ray
- Plant Functional Genomics Laboratory, Department of Botany, University of Calcutta, Kolkata, India.
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Ev LD, Damé-Teixeira N, DO T, Maltz M, Parolo CCF. The role of Candida albicans in root caries biofilms: an RNA-seq analysis. J Appl Oral Sci 2020; 28:e20190578. [PMID: 32348446 PMCID: PMC7185980 DOI: 10.1590/1678-7757-2019-0578] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 01/19/2020] [Indexed: 11/30/2022] Open
Abstract
Objective This study sought to analyze the gene expression of Candida albicans in sound root surface and root caries lesions, exploring its role in root caries pathogenesis. Methodology The differential gene expression of C. albicans and the specific genes related to cariogenic traits were studied in association with samples of biofilm collected from exposed sound root surface (SRS, n=10) and from biofilm and carious dentin of active root carious lesions (RC, n=9). The total microbial RNA was extracted, and the cDNA libraries were prepared and sequenced on the Illumina Hi-Seq2500. Unique reads were mapped to 163 oral microbial reference genomes including two chromosomes of C. albicans SC5314 (14,217 genes). The putative presence of C. albicans was estimated (sum of reads/total number of genes≥1) in each sample. Count data were normalized (using the DESeq method package) to analyze differential gene expression (using the DESeq2R package) applying the Benjamini-Hochberg correction (FDR<0.05). Results Two genes (CaO19.610, FDR=0.009; CaO19.2506, FDR=0.018) were up-regulated on SRS, and their functions are related to biofilm formation. Seven genes ( UTP20 , FDR=0.018; ITR1 , FDR=0.036; DHN6 , FDR=0.046; CaO19.7197 , FDR=0.046; CaO19.7838 , FDR=0.046; STT4 , FDR=0.046; GUT1 , FDR=0.046) were up-regulated on RC and their functions are related to metabolic activity, sugar transport, stress tolerance, invasion and pH regulation. The use of alternative carbon sources, including lactate, and the ability to form hypha may be a unique trait of C. albicans influencing biofilm virulence. Conclusions C. albicans is metabolically active in SRS and RC biofilm, with different roles in health and disease.
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Affiliation(s)
- Laís Daniela Ev
- Departamento de Odontologia Preventiva e Social, Faculdade de Odontologia, Universidade de Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
| | - Nailê Damé-Teixeira
- Departamento de Odontologia, Faculdade de Ciências da Saúde, Universidade de Brasília, Brasília, Distrito Federal, Brasil
| | - Thuy DO
- School of Dentistry, Faculty of Medicine & Health, University of Leeds, Leeds, United Kingdom
| | - Marisa Maltz
- Departamento de Odontologia Preventiva e Social, Faculdade de Odontologia, Universidade de Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
| | - Clarissa Cavalcanti Fatturi Parolo
- Departamento de Odontologia Preventiva e Social, Faculdade de Odontologia, Universidade de Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil
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Li QF, Zhou Y, Xiong M, Ren XY, Han L, Wang JD, Zhang CQ, Fan XL, Liu QQ. Gibberellin recovers seed germination in rice with impaired brassinosteroid signalling. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 293:110435. [PMID: 32081273 DOI: 10.1016/j.plantsci.2020.110435] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 01/26/2020] [Accepted: 02/01/2020] [Indexed: 05/25/2023]
Abstract
Seed germination is essential for ensuring grain yield and quality. Germination rate, uniformity, and post-germination growth all contribute to cultivation. Although the phytohormones gibberellin (GA) and brassinosteroid (BR) are known to regulate germination, the underlying mechanism of their crosstalk in co-regulating rice seed germination remains unclear. In this study, the isobaric tags for relative and absolute quantitation (iTRAQ) proteomic approach was employed to identify target proteins responsive to GA during recovery of germination in BR-deficient and BR-insensitive rice. A total of 42 differentially abundant proteins were identified in both BR-deficient and BR-insensitive plants, and most were altered consistently in the two groups. Gene Ontology (GO) analysis revealed enrichment in proteins with binding and catalytic activity. A potential protein-protein interaction network was constructed using STRING analysis, and five Late Embryogenesis Abundant (LEA) family members were markedly down-regulated at both mRNA transcript and protein levels. These LEA genes were specifically expressed in rice seeds, especially during the latter stages of seed development. Mutation of LEA33 affected rice grain size and seed germination, possibly by reducing BR accumulation and enhancing GA biosynthesis. The findings improve our knowledge of the mechanisms by which GA and BR coordinate seed germination.
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Affiliation(s)
- Qian-Feng Li
- Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, College of Agriculture, Yangzhou University, Yangzhou, 225009, China; Co-Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province, Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, Yangzhou University, Yangzhou, 225009, China.
| | - Yu Zhou
- Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, College of Agriculture, Yangzhou University, Yangzhou, 225009, China
| | - Min Xiong
- Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, College of Agriculture, Yangzhou University, Yangzhou, 225009, China
| | - Xin-Yu Ren
- Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, College of Agriculture, Yangzhou University, Yangzhou, 225009, China
| | - Li Han
- Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, College of Agriculture, Yangzhou University, Yangzhou, 225009, China
| | - Jin-Dong Wang
- Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, College of Agriculture, Yangzhou University, Yangzhou, 225009, China
| | - Chang-Quan Zhang
- Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, College of Agriculture, Yangzhou University, Yangzhou, 225009, China; Co-Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province, Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, Yangzhou University, Yangzhou, 225009, China
| | - Xiao-Lei Fan
- Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, College of Agriculture, Yangzhou University, Yangzhou, 225009, China; Co-Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province, Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, Yangzhou University, Yangzhou, 225009, China
| | - Qiao-Quan Liu
- Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, College of Agriculture, Yangzhou University, Yangzhou, 225009, China; Co-Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province, Joint International Research Laboratory of Agriculture and Agri-Product Safety of the Ministry of Education, Yangzhou University, Yangzhou, 225009, China.
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Kishor PBK, Suravajhala R, Rajasheker G, Marka N, Shridhar KK, Dhulala D, Scinthia KP, Divya K, Doma M, Edupuganti S, Suravajhala P, Polavarapu R. Lysine, Lysine-Rich, Serine, and Serine-Rich Proteins: Link Between Metabolism, Development, and Abiotic Stress Tolerance and the Role of ncRNAs in Their Regulation. FRONTIERS IN PLANT SCIENCE 2020; 11:546213. [PMID: 33343588 PMCID: PMC7744598 DOI: 10.3389/fpls.2020.546213] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 10/30/2020] [Indexed: 05/06/2023]
Abstract
Lysine (Lys) is indispensable nutritionally, and its levels in plants are modulated by both transcriptional and post-transcriptional control during plant ontogeny. Animal glutamate receptor homologs have been detected in plants, which may participate in several plant processes through the Lys catabolic products. Interestingly, a connection between Lys and serotonin metabolism has been established recently in rice. 2-Aminoadipate, a catabolic product of Lys appears to play a critical role between serotonin accumulation and the color of rice endosperm/grain. It has also been shown that expression of some lysine-methylated proteins and genes encoding lysine-methyltransferases (KMTs) are regulated by cadmium even as it is known that Lys biosynthesis and its degradation are modulated by novel mechanisms. Three complex pathways co-exist in plants for serine (Ser) biosynthesis, and the relative preponderance of each pathway in relation to plant development or abiotic stress tolerance are being unfolded slowly. But the phosphorylated pathway of L-Ser biosynthesis (PPSB) appears to play critical roles and is essential in plant metabolism and development. Ser, which participates indirectly in purine and pyrimidine biosynthesis and plays a pivotal role in plant metabolism and signaling. Also, L-Ser has been implicated in plant responses to both biotic and abiotic stresses. A large body of information implicates Lys-rich and serine/arginine-rich (SR) proteins in a very wide array of abiotic stresses. Interestingly, a link exists between Lys-rich K-segment and stress tolerance levels. It is of interest to note that abiotic stresses largely influence the expression patterns of SR proteins and also the alternative splicing (AS) patterns. We have checked if any lncRNAs form a cohort of differentially expressed genes from the publicly available PPSB, sequence read archives of NCBI GenBank. Finally, we discuss the link between Lys and Ser synthesis, catabolism, Lys-proteins, and SR proteins during plant development and their myriad roles in response to abiotic stresses.
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Affiliation(s)
- P. B. Kavi Kishor
- Department of Biotechnology, Vignan’s Foundation for Science, Technology and Research (Deemed to be University), Guntur, India
- *Correspondence: P. B. Kavi Kishor,
| | | | | | - Nagaraju Marka
- Biochemistry Division, National Institute of Nutrition-ICMR, Hyderabad, India
| | | | - Divya Dhulala
- Department of Genetics, Osmania University, Hyderabad, India
| | | | - Kummari Divya
- Department of Genetics, Osmania University, Hyderabad, India
| | - Madhavi Doma
- Department of Genetics, Osmania University, Hyderabad, India
| | | | - Prashanth Suravajhala
- Department of Biotechnology and Bioinformatics, Birla Institute of Scientific Research, Jaipur, India
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Artur MAS, Rienstra J, Dennis TJ, Farrant JM, Ligterink W, Hilhorst H. Structural Plasticity of Intrinsically Disordered LEA Proteins from Xerophyta schlechteri Provides Protection In Vitro and In Vivo. FRONTIERS IN PLANT SCIENCE 2019; 10:1272. [PMID: 31681372 PMCID: PMC6798065 DOI: 10.3389/fpls.2019.01272] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 09/11/2019] [Indexed: 05/27/2023]
Abstract
Late embryogenesis abundant (LEA) proteins are essential to the ability of resurrection plants and orthodox seeds to protect the subcellular milieu against irreversible damage associated with desiccation. In this work, we investigated the structure and function of six LEA proteins expressed during desiccation in the monocot resurrection species Xerophyta schlechteri (XsLEAs). In silico analyses suggested that XsLEAs are hydrophilic proteins with variable intrinsically disordered protein (IDP) properties. Circular dichroism (CD) analysis indicated that these proteins are mostly unstructured in water but acquire secondary structure in hydrophobic solution, suggesting that structural dynamics may play a role in their function in the subcellular environment. The protective property of XsLEAs was demonstrated by their ability to preserve the activity of the enzyme lactate dehydrogenase (LDH) against desiccation, heat and oxidative stress, as well as growth of Escherichia coli upon exposure to osmotic and salt stress. Subcellular localization analysis indicated that XsLEA recombinant proteins are differentially distributed in the cytoplasm, membranes and nucleus of Nicotiana benthamiana leaves. Interestingly, a LEA_1 family protein (XsLEA1-8), showing the highest disorder-to-order propensity and protective ability in vitro and in vivo, was also able to enhance salt and drought stress tolerance in Arabidopsis thaliana. Together, our results suggest that the structural plasticity of XsLEAs is essential for their protective activity to avoid damage of various subcellular components caused by water deficit stress. XsLEA1-8 constitutes a potential model protein for engineering structural stability in vitro and improvement of water-deficit stress tolerance in plants.
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Affiliation(s)
| | - Juriaan Rienstra
- Laboratory of Plant Physiology, Wageningen University, Wageningen, Netherlands
| | - Timothy J. Dennis
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, South Africa
| | - Jill M. Farrant
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, South Africa
| | - Wilco Ligterink
- Laboratory of Plant Physiology, Wageningen University, Wageningen, Netherlands
| | - Henk Hilhorst
- Laboratory of Plant Physiology, Wageningen University, Wageningen, Netherlands
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13
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Genome-wide identification of and functional insights into the late embryogenesis abundant (LEA) gene family in bread wheat (Triticum aestivum). Sci Rep 2019; 9:13375. [PMID: 31527624 PMCID: PMC6746774 DOI: 10.1038/s41598-019-49759-w] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 08/29/2019] [Indexed: 12/20/2022] Open
Abstract
Late embryogenesis abundant (LEA) proteins are involved in the responses and adaptation of plants to various abiotic stresses, including dehydration, salinity, high temperature, and cold. Here, we report the first comprehensive survey of the LEA gene family in “Chinese Spring” wheat (Triticum aestivum). A total of 179 TaLEA genes were identified in T. aestivum and classified into eight groups. All TaLEA genes harbored the LEA conserved motif and had few introns. TaLEA genes belonging to the same group exhibited similar gene structures and chromosomal locations. Our results revealed that most TaLEA genes contained abscisic acid (ABA)-responsive elements (ABREs) and various cis-acting elements associated with the stress response in the promoter region and were induced under ABA and abiotic stress treatments. In addition, 8 genes representing each group were introduced into E. coli and yeast to investigate the protective function of TaLEAs under heat and salt stress. TaLEAs enhanced the tolerance of E. coli and yeast to salt and heat, indicating that these proteins have protective functions in host cells under stress conditions. These results increase our understanding of LEA genes and provide robust candidate genes for future functional investigations aimed at improving the stress tolerance of wheat.
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14
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Causal Enzymology and Physiological Aspects May Be Accountable to Membrane Integrity in Response to Salt Stress in Arabidopsis thaliana Lines. BIOMED RESEARCH INTERNATIONAL 2019; 2019:3534943. [PMID: 31396528 PMCID: PMC6668528 DOI: 10.1155/2019/3534943] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 06/19/2019] [Accepted: 07/08/2019] [Indexed: 11/18/2022]
Abstract
Apart from their significance in the protection against stress conditions, the plant cell membranes are essential for proper development of the diverse surface structures formed on aerial plant organs. In addition, we signal that membrane remodeling and integrity are function of some of causal physiological and enzymological aspects such as the MDA, the ion leakage and also the monitoring of some phytozymes involved in lipid and cellulose metabolisms. Those last ones are related to the membrane structure (lipases and cellulases), that were assessed in durum wheat dehydrin transgenic context (YS, K1-K2, DH2, and DH4), proline metabolic mutant (P5CS1-4) per comparison with the wild-type plant (Wt). We report also the docking data reinforcing the fact that the membrane integrity seems to be function of causal enzymological behaviors, through the molecular dynamic investigation resulting from the dehydrin-phytozyme interactions and also from the inhibition effect of the durum wheat LTP4 on the lipase activity.
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15
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Lv A, Su L, Liu X, Xing Q, Huang B, An Y, Zhou P. Characterization of Dehydrin protein, CdDHN4-L and CdDHN4-S, and their differential protective roles against abiotic stress in vitro. BMC PLANT BIOLOGY 2018; 18:299. [PMID: 30477420 PMCID: PMC6258397 DOI: 10.1186/s12870-018-1511-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 10/29/2018] [Indexed: 05/13/2023]
Abstract
BACKGROUND Dehydrins play positive roles in regulating plant abiotic stress responses. The objective of this study was to characterize two dehydrin genes, CdDHN4-L and CdDHN4-S, generated by alternative splicing of CdDHN4 in bermudagrass. RESULTS Overexpression of CdDHN4-L with φ-segment and CdDHN4-S lacking of φ-segment in Arabidopsis significantly increased tolerance against abiotic stresses. The growth phenotype of Arabidopsis exposed to NaCl at 100 mM was better in plants overexpressing CdDHN4-L than those overexpressing CdDHN4-S, as well as better in E.coli cells overexpressing CdDHN4-L than those overexpressing CdDHN4-S in 300 and 400 mM NaCl, and under extreme temperature conditions at - 20 °C and 50 °C. The CdDHN4-L had higher disordered characterization on structures than CdDHN4-S at temperatures from 10 to 90 °C. The recovery activities of lactic dehydrogenase (LDH) and alcohol dehydrogenase (ADH) in presence of CdDHN4-L and CdDHN4-S were higher than that of LDH and ADH alone under freeze-thaw damage and heat. Protein-binding and bimolecular fluorescence complementation showed that both proteins could bind to proteins with positive isoelectric point via electrostatic forces. CONCLUSIONS These results indicate that CdDHN4-L has higher protective ability against abiotic stresses due to its higher flexible unfolded structure and thermostability in comparison with CdDHN4-S. These provided direct evidence of the function of the φ-segment in dehydrins for protecting plants against abiotic stress and to show the electrostatic interaction between dehydrins and client proteins.
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Affiliation(s)
- Aimin Lv
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Liantai Su
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Xingchen Liu
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Qiang Xing
- Shanghai Chenshan Botanical Garden, Shanghai, 201602 People’s Republic of China
| | - Bingru Huang
- Department of Plant Biology and Pathology, Rutgers, the State University of New Jersey, New Jersey, NJ 08901 USA
| | - Yuan An
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
- Key Laboratory of Urban Agriculture, Ministry of Agriculture, Shanghai, 201101 People’s Republic of China
| | - Peng Zhou
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
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16
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Hanin M, Ebel C, Ngom M, Laplaze L, Masmoudi K. New Insights on Plant Salt Tolerance Mechanisms and Their Potential Use for Breeding. FRONTIERS IN PLANT SCIENCE 2016; 7:1787. [PMID: 27965692 PMCID: PMC5126725 DOI: 10.3389/fpls.2016.01787] [Citation(s) in RCA: 288] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Accepted: 11/14/2016] [Indexed: 05/18/2023]
Abstract
Soil salinization is a major threat to agriculture in arid and semi-arid regions, where water scarcity and inadequate drainage of irrigated lands severely reduce crop yield. Salt accumulation inhibits plant growth and reduces the ability to uptake water and nutrients, leading to osmotic or water-deficit stress. Salt is also causing injury of the young photosynthetic leaves and acceleration of their senescence, as the Na+ cation is toxic when accumulating in cell cytosol resulting in ionic imbalance and toxicity of transpiring leaves. To cope with salt stress, plants have evolved mainly two types of tolerance mechanisms based on either limiting the entry of salt by the roots, or controlling its concentration and distribution. Understanding the overall control of Na+ accumulation and functional studies of genes involved in transport processes, will provide a new opportunity to improve the salinity tolerance of plants relevant to food security in arid regions. A better understanding of these tolerance mechanisms can be used to breed crops with improved yield performance under salinity stress. Moreover, associations of cultures with nitrogen-fixing bacteria and arbuscular mycorrhizal fungi could serve as an alternative and sustainable strategy to increase crop yields in salt-affected fields.
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Affiliation(s)
- Moez Hanin
- Laboratoire de Biotechnologie et Amélioration des Plantes, Centre de Biotechnologie de SfaxSfax, Tunisia
- Institut Supérieur de Biotechnologie, Université de SfaxSfax, Tunisia
| | - Chantal Ebel
- Laboratoire de Biotechnologie et Amélioration des Plantes, Centre de Biotechnologie de SfaxSfax, Tunisia
- Institut Supérieur de Biotechnologie, Université de SfaxSfax, Tunisia
| | - Mariama Ngom
- Laboratoire mixte international Adaptation des Plantes et microorganismes associés aux Stress EnvironnementauxDakar, Senegal
- Laboratoire Commun de Microbiologie, Institut de Recherche pour le Développement/Institut Sénégalais de Recherches Agricoles/Université Cheikh Anta DiopDakar, Senegal
| | - Laurent Laplaze
- Laboratoire mixte international Adaptation des Plantes et microorganismes associés aux Stress EnvironnementauxDakar, Senegal
- Laboratoire Commun de Microbiologie, Institut de Recherche pour le Développement/Institut Sénégalais de Recherches Agricoles/Université Cheikh Anta DiopDakar, Senegal
- Institut de Recherche pour le Développement, Unités Mixtes de Recherche, Diversité, Adaptation, Développement des Plantes (DIADE), MontpellierFrance
| | - Khaled Masmoudi
- Department of Aridland, College of Food and Agriculture, United Arab Emirates UniversityAl Ain, UAE
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Drira M, Hanin M, Masmoudi K, Brini F. Comparison of full-length and conserved segments of wheat dehydrin DHN-5 overexpressed in Arabidopsis thaliana showed different responses to abiotic and biotic stress. FUNCTIONAL PLANT BIOLOGY : FPB 2016; 43:1048-1060. [PMID: 32480525 DOI: 10.1071/fp16134] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 07/06/2016] [Indexed: 05/20/2023]
Abstract
Dehydrins (DHNs) are among the most common proteins accumulated in plants under water-related stress. They typically contain at least three conserved sequences designated as the Y-, S- and K-segments. The present work aims to highlight the role of the K-segments in plant tolerance to biotic and abiotic stresses. For this purpose, transgenic Arabidopsis thaliana (L.) Heyhn. lines expressing distinct wheat (Triticum aestivum L.) DHN-5 truncated constructs with or without the K-segments were generated. Our results showed that unlike the derivative lacking a K-segment, constructs containing only one or two K-segments enhanced the tolerance of A. thaliana to diverse stresses and were similar to the full-length wheat DHN-5. Moreover, compared with the wild-type and the YS form, the transgenic plants overexpressing wheat DHN-5 with K-segments maintained higher superoxide dismutase, catalase and peroxide dismutase enzymatic activity, and accumulated lower levels of H2O2 and malondialdehyde. In addition, we demonstrated that lines like A. thaliana overexpressing wheat DHN-5 showed increased resistance to fungal infections caused by Botrytis cinerea and Alternaria solani. Finally, the overexpression of the different forms of wheat DHN-5 led to the regulation of the expression of several genes involved in the jasmonic acid signalling pathway.
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Affiliation(s)
- Marwa Drira
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax, University of Sfax, BP 1177, 3018, Sfax, Tunisia
| | - Moez Hanin
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax, University of Sfax, BP 1177, 3018, Sfax, Tunisia
| | - Khaled Masmoudi
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax, University of Sfax, BP 1177, 3018, Sfax, Tunisia
| | - Faiçal Brini
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax, University of Sfax, BP 1177, 3018, Sfax, Tunisia
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18
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Saibi W, Zouari N, Masmoudi K, Brini F. Role of the durum wheat dehydrin in the function of proteases conferring salinity tolerance in Arabidopsis thaliana transgenic lines. Int J Biol Macromol 2016; 85:311-6. [PMID: 26751399 DOI: 10.1016/j.ijbiomac.2015.12.062] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Revised: 12/16/2015] [Accepted: 12/17/2015] [Indexed: 10/22/2022]
Abstract
Dehydrins are claimed to stabilize macromolecules against freezing damage, dehydration, ionic or osmotic stresses, thermal stress and re-folding yield. However, their precise function remains unknown. In this context, we report the behavior of protease activities in dehydrin transgenic Arabidopsis lines against the wild type plant under salt stress (100mM NaCl). Indeed, proteases play key roles in plants, maintaining strict protein quality control and degrading specific sets of proteins in response to diverse environmental and developmental stimuli. We proved that durum wheat DHN-5 modulates the activity of some proteases, summarized on the promotion of the Cysteinyl protease and the decrease of the Aspartyl protease activity. This fact is also upgraded in salt stress conditions. We conclude that the dehydrin transgenic context encodes salinity tolerance in transgenic lines through the modulation of the interaction not only at transcriptional level but also at protein level and also with the impact of salt stress as an endogenous and exogenous effector on some biocatalysts like proteases.
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Affiliation(s)
- Walid Saibi
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax, University of Sfax, B.P 1177, 3018 Sfax, Tunisia.
| | - Nabil Zouari
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax, University of Sfax, B.P 1177, 3018 Sfax, Tunisia
| | - Khaled Masmoudi
- International Center for Biosaline Agriculture (ICBA), P.O.Box 14660, Dubai, United Arab Emirates
| | - Faiçal Brini
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax, University of Sfax, B.P 1177, 3018 Sfax, Tunisia
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19
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Saibi W, Feki K, Ben Mahmoud R, Brini F. Durum wheat dehydrin (DHN-5) confers salinity tolerance to transgenic Arabidopsis plants through the regulation of proline metabolism and ROS scavenging system. PLANTA 2015; 242:1187-94. [PMID: 26105651 DOI: 10.1007/s00425-015-2351-z] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 06/09/2015] [Indexed: 05/18/2023]
Abstract
The wheat dehydrin (DHN-5) gives birth to salinity tolerance to transgenic Arabidopsis plants by the regulation of proline metabolism and the ROS scavenging system. Dehydrins (DHNs) are involved in plant abiotic stress tolerance. In this study, we reported that salt tolerance of transgenic Arabidopsis plants overexpressing durum wheat dehydrin (DHN-5) was closely related to the activation of the proline metabolism enzyme (P5CS) and some antioxidant biocatalysts. Indeed, DHN-5 improved P5CS activity in the transgenic plants generating a significant proline accumulation. Moreover, salt tolerance of Arabidopsis transgenic plants was accompanied by an excellent activation of antioxidant enzymes like catalase (CAT), superoxide dismutase (SOD) and peroxide dismutase (POD) and generation of a lower level of hydrogen peroxide (H2O2) in leaves compared to the wild-type plants. The enzyme activities were enhanced in these transgenic plants in the presence of exogenous proline. Nevertheless, proline accumulation was slightly reduced in transgenic plants promoting chlorophyll levels. All these results suggest the crucial role of DHN-5 in response to salt stress through the activation of enzymes implicated in proline metabolism and in ROS scavenging enzymes.
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Affiliation(s)
- Walid Saibi
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax-University of Sfax, B.P 1177, 3018, Sfax, Tunisia.
| | - Kaouthar Feki
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax-University of Sfax, B.P 1177, 3018, Sfax, Tunisia
| | - Rihem Ben Mahmoud
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax-University of Sfax, B.P 1177, 3018, Sfax, Tunisia
| | - Faiçal Brini
- Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax-University of Sfax, B.P 1177, 3018, Sfax, Tunisia
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20
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Yang W, Zhang L, Lv H, Li H, Zhang Y, Xu Y, Yu J. The K-segments of wheat dehydrin WZY2 are essential for its protective functions under temperature stress. FRONTIERS IN PLANT SCIENCE 2015. [PMID: 26124763 DOI: 10.3389/fpls.2015.00406ref] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Dehydrins (DHNs), group 2 of late embryogenesis abundant (LEA) proteins, are up-regulated in most plants during cold, drought, heat, or salinity stress. All DHNs contain at least one K-segment, which is believed to play a significant role in DHN function by forming an amphipathic helix. In previous studies, wzy2, an YSK2-type DHN gene, was isolated from the Zhengyin 1 cultivar of Triticum aestivum under cold and drought stress treatment conditions. Four WZY2 truncated derivatives were constructed to knock out the K-, Y- or S-segment, which potentially affect the function of the protein. In vivo assays of Escherichia coli viability enhancement, in vitro lactate dehydrogenase (LDH) activity protection and ex vivo protein aggregation prevention assays revealed that WZY2 acted as a protectant and improved stress tolerance during temperature variation. The results also showed that unlike the truncated derivative without K-segments, the derivative containing two K-segments had remarkable effects that were similar to those of full-length WZY2, indicating that the K-segment is the major functional component of WZY2. Moreover, compared with the other segments, the first K-segment might be the most critical contributor to WZY2 functionality. In general, this work highlights the behavior of DHNs in relieving cold stress ex vivo and the contribution of the K-segment to DHN function.
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Affiliation(s)
- Wenbo Yang
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling China
| | - Linsheng Zhang
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling China
| | - Hui Lv
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling China
| | - He Li
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling China
| | - Yane Zhang
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling China
| | - Yang Xu
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling China
| | - Jianing Yu
- College of Life Sciences, Shaanxi Normal University Xi'an, China
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21
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Yang W, Zhang L, Lv H, Li H, Zhang Y, Xu Y, Yu J. The K-segments of wheat dehydrin WZY2 are essential for its protective functions under temperature stress. FRONTIERS IN PLANT SCIENCE 2015; 6:406. [PMID: 26124763 PMCID: PMC4467595 DOI: 10.3389/fpls.2015.00406] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 05/19/2015] [Indexed: 05/02/2023]
Abstract
Dehydrins (DHNs), group 2 of late embryogenesis abundant (LEA) proteins, are up-regulated in most plants during cold, drought, heat, or salinity stress. All DHNs contain at least one K-segment, which is believed to play a significant role in DHN function by forming an amphipathic helix. In previous studies, wzy2, an YSK2-type DHN gene, was isolated from the Zhengyin 1 cultivar of Triticum aestivum under cold and drought stress treatment conditions. Four WZY2 truncated derivatives were constructed to knock out the K-, Y- or S-segment, which potentially affect the function of the protein. In vivo assays of Escherichia coli viability enhancement, in vitro lactate dehydrogenase (LDH) activity protection and ex vivo protein aggregation prevention assays revealed that WZY2 acted as a protectant and improved stress tolerance during temperature variation. The results also showed that unlike the truncated derivative without K-segments, the derivative containing two K-segments had remarkable effects that were similar to those of full-length WZY2, indicating that the K-segment is the major functional component of WZY2. Moreover, compared with the other segments, the first K-segment might be the most critical contributor to WZY2 functionality. In general, this work highlights the behavior of DHNs in relieving cold stress ex vivo and the contribution of the K-segment to DHN function.
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Affiliation(s)
- Wenbo Yang
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, YanglingChina
| | - Linsheng Zhang
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, YanglingChina
- *Correspondence: Linsheng Zhang, College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Xinong Road No.22, Yangling, Shaanxi 712100, China
| | - Hui Lv
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, YanglingChina
| | - He Li
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, YanglingChina
| | - Yane Zhang
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, YanglingChina
| | - Yang Xu
- College of Life Sciences/State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, YanglingChina
| | - Jianing Yu
- College of Life Sciences, Shaanxi Normal UniversityXi’an, China
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