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Chun Y, Fang J, Savelieva EM, Lomin SN, Shang J, Sun Y, Zhao J, Kumar A, Yuan S, Yao X, Liu CM, Arkhipov DV, Romanov GA, Li X. The cytokinin receptor OHK4/OsHK4 regulates inflorescence architecture in rice via an IDEAL PLANT ARCHITECTURE1/WEALTHY FARMER'S PANICLE-mediated positive feedback circuit. THE PLANT CELL 2023; 36:40-64. [PMID: 37811656 PMCID: PMC10734611 DOI: 10.1093/plcell/koad257] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 06/07/2023] [Accepted: 08/18/2023] [Indexed: 10/10/2023]
Abstract
Inflorescence architecture is important for rice (Oryza sativa) grain yield. The phytohormone cytokinin (CK) has been shown to regulate rice inflorescence development; however, the underlying mechanism mediated by CK perception is still unclear. Employing a forward genetic approach, we isolated an inactive variant of the CK receptor OHK4/OsHK4 gene named panicle length1, which shows decreased panicle size due to reduced inflorescence meristem (IM) activity. A 2-amino acid deletion in the long α-helix stalk of the sensory module of OHK4 impairs the homodimerization and ligand-binding capacity of the receptor, even though the residues do not touch the ligand-binding domain or the dimerization interface. This deletion impairs CK signaling that occurs through the type-B response regulator OsRR21, which acts downstream of OHK4 in controlling inflorescence size. Meanwhile, we found that IDEAL PLANT ARCHITECTURE1(IPA1)/WEALTHY FARMER'S PANICLE (WFP), encoding a positive regulator of IM development, acts downstream of CK signaling and is directly activated by OsRR21. Additionally, we revealed that IPA1/WFP directly binds to the OHK4 promoter and upregulates its expression through interactions with 2 TCP transcription factors, forming a positive feedback circuit. Altogether, we identified the OHK4-OsRR21-IPA1 regulatory module, providing important insights into the role of CK signaling in regulating rice inflorescence architecture.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | - Xueyong Li
- Author for correspondence: (X.L.), (G.A.R.)
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2
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Arkhipov DV, Lomin SN, Romanov GA. A Model of the Full-Length Cytokinin Receptor: New Insights and Prospects. Int J Mol Sci 2023; 25:73. [PMID: 38203244 PMCID: PMC10779265 DOI: 10.3390/ijms25010073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/11/2023] [Accepted: 12/15/2023] [Indexed: 01/12/2024] Open
Abstract
Cytokinins (CK) are one of the most important classes of phytohormones that regulate a wide range of processes in plants. A CK receptor, a sensor hybrid histidine kinase, was discovered more than 20 years ago, but the structural basis for its signaling is still a challenge for plant biologists. To date, only two fragments of the CK receptor structure, the sensory module and the receiver domain, were experimentally resolved. Some other regions were built up by molecular modeling based on structures of proteins homologous to CK receptors. However, in the long term, these data have proven insufficient for solving the structure of the full-sized CK receptor. The functional unit of CK receptor is the receptor dimer. In this article, a molecular structure of the dimeric form of the full-length CK receptor based on AlphaFold Multimer and ColabFold modeling is presented for the first time. Structural changes of the receptor upon interacting with phosphotransfer protein are visualized. According to mathematical simulation and available data, both types of dimeric receptor complexes with hormones, either half- or fully liganded, appear to be active in triggering signals. In addition, the prospects of using this and similar models to address remaining fundamental problems of CK signaling were outlined.
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Affiliation(s)
| | | | - Georgy A. Romanov
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia; (D.V.A.); (S.N.L.)
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3
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Liu Z, Li P, Ren W, Chen Z, Olukayode T, Mi G, Yuan L, Chen F, Pan Q. Hybrid performance evaluation and genome-wide association analysis of root system architecture in a maize association population. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2023; 136:194. [PMID: 37606710 DOI: 10.1007/s00122-023-04442-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 08/04/2023] [Indexed: 08/23/2023]
Abstract
KEY MESSAGE The genetic architecture of RSA traits was dissected by GWAS and coexpression networks analysis in a maize association population. Root system architecture (RSA) is a crucial determinant of water and nutrient uptake efficiency in crops. However, the maize genetic architecture of RSA is still poorly understood due to the challenges in quantifying root traits and the lack of dense molecular markers. Here, an association mapping panel including 356 inbred lines were crossed with a common tester, Zheng58, and the test crosses were phenotyped for 12 RSA traits in three locations. We observed a 1.3 ~ sixfold phenotypic variation for measured RSA in the association panel. The association panel consisted of four subpopulations, non-stiff stalk (NSS) lines, stiff stalk (SS), tropical/subtropical (TST), and mixed. Zheng58 × TST has a 2.1% higher crown root number (CRN) and 8.6% less brace root number (BRN) than Zheng58 × NSS and Zheng58 × SS, respectively. Using a genome-wide association study (GWAS) with 1.25 million SNPs and correction for population structure, 191 significant SNPs were identified for root traits. Ninety (47%) of the significant SNPs showed positive allelic effects, and 101 (53%) showed negative effects. Each locus could explain 0.39% to 11.8% of phenotypic variation. By integrating GWAS results and comparing coexpression networks, 26 high-priority candidate genes were identified. Gene GRMZM2G377215, which belongs to the COBRA-like gene family, affected root growth and development. Gene GRMZM2G468657 encodes the aspartic proteinase nepenthesin-1, related to root development and N-deficient response. Collectively, our research provides progress in the genetic dissection of root system architecture. These findings present the further possibility for the genetic improvement of root traits in maize.
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Affiliation(s)
- Zhigang Liu
- College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
- Global Institute for Food Security, University of Saskatchewan, Saskatoon, Canada
| | - Pengcheng Li
- Key Laboratory of Plant Functional Genomics of the Ministry of Education, Yangzhou University, Yangzhou, China
| | - Wei Ren
- College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
| | - Zhe Chen
- College of Resources and Environment, Jilin Agricultural University, Changchun, China
| | - Toluwase Olukayode
- Global Institute for Food Security, University of Saskatchewan, Saskatoon, Canada
| | - Guohua Mi
- College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
| | - Lixing Yuan
- College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
| | - Fanjun Chen
- College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China
- Sanya Institute of China Agricultural University, Sanya, China
| | - Qingchun Pan
- College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, Key Laboratory of Plant-Soil Interactions of MOE, China Agricultural University, Beijing, China.
- Sanya Institute of China Agricultural University, Sanya, China.
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Uyehara AN, Del Valle-Echevarria AR, Hunter CT, Nelissen H, Demuynck K, Cahill JF, Gorman Z, Jander G, Muszynski MG. Cytokinin Promotes Jasmonic Acid Accumulation in the Control of Maize Leaf Growth. PLANTS (BASEL, SWITZERLAND) 2023; 12:3014. [PMID: 37631225 PMCID: PMC10459232 DOI: 10.3390/plants12163014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 07/18/2023] [Accepted: 08/09/2023] [Indexed: 08/27/2023]
Abstract
Plant organ growth results from the combined activity of cell division and cell expansion. The co-ordination of these two processes depends on the interplay between multiple hormones that determine the final organ size. Using the semidominant Hairy Sheath Frayed1 (Hsf1) maize mutant that hypersignals the perception of cytokinin (CK), we show that CK can reduce leaf size and growth rate by decreasing cell division. Linked to CK hypersignaling, the Hsf1 mutant has an increased jasmonic acid (JA) content, a hormone that can inhibit cell division. The treatment of wild-type seedlings with exogenous JA reduces maize leaf size and growth rate, while JA-deficient maize mutants have increased leaf size and growth rate. Expression analysis revealed the increased transcript accumulation of several JA pathway genes in the Hsf1 leaf growth zone. A transient treatment of growing wild-type maize shoots with exogenous CK also induced the expression of JA biosynthetic genes, although this effect was blocked by the co-treatment with cycloheximide. Together, our results suggest that CK can promote JA accumulation, possibly through the increased expression of specific JA pathway genes.
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Affiliation(s)
- Aimee N. Uyehara
- Department of Tropical Plant and Soil Sciences, University of Hawaiʻi at Mānoa, Honolulu, HI 96822, USA
| | | | - Charles T. Hunter
- Chemistry Research, Center for Medical, Agricultural and Veterinary Entomology, USDA-ARS, Gainesville, FL 32608, USA; (C.T.H.)
| | - Hilde Nelissen
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Gent, Belgium
- Center for Plant Systems Biology, VIB, 9052 Gent, Belgium
| | - Kirin Demuynck
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Gent, Belgium
- Center for Plant Systems Biology, VIB, 9052 Gent, Belgium
| | - James F. Cahill
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA 50011, USA
| | - Zachary Gorman
- Chemistry Research, Center for Medical, Agricultural and Veterinary Entomology, USDA-ARS, Gainesville, FL 32608, USA; (C.T.H.)
| | - Georg Jander
- Boyce Thompson Institute, Cornell University, Ithaca, NY 14853, USA
| | - Michael G. Muszynski
- Department of Tropical Plant and Soil Sciences, University of Hawaiʻi at Mānoa, Honolulu, HI 96822, USA
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Feng Y, Ren Y, Zhang H, Heng Y, Wang Z, Wang Y. Halostachys caspica pathogenesis-related protein 10 acts as a cytokinin reservoir to regulate plant growth and development. FRONTIERS IN PLANT SCIENCE 2023; 14:1116985. [PMID: 37180382 PMCID: PMC10169677 DOI: 10.3389/fpls.2023.1116985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 04/04/2023] [Indexed: 05/16/2023]
Abstract
Pathogenesis-related class 10 (PR-10) proteins play a role in plant growth and development, but the underlying molecular mechanisms are unclear. Here, we isolated a salt-induced PR-10 gene from the halophyte Halostachys caspica and named it HcPR10. HcPR10 was constitutively expressed during development and HcPR10 localized to the nucleus and cytoplasm. HcPR10-mediated phenotypes including bolting, earlier flowering, increased branch number and siliques per plant are highly correlated with increased cytokinin levels in transgenic Arabidopsis. Meanwhile, increased levels of cytokinin in plants is temporally correlated with HcPR10 expression patterns. Although the expression of cytokinin biosynthesis genes validated was not upregulated, cytokinin-related genes including chloroplast-related genes, cytokinin metabolism and cytokinin responses genes and flowering-related genes were significantly upregulated in the transgenic Arabidopsis compared to the wild type by transcriptome deep sequencing. Analysis of the crystal structure of HcPR10 revealed a trans-zeatin riboside (a type of cytokinin) located deep in its cavity, with a conserved conformation and protein-ligand interactions, supporting HcRP10 acts as a cytokinin reservoir. Moreover, HcPR10 in Halostachys caspica predominantly accumulated in vascular tissue, the site of long-distance translocation of plant hormones. Collectively, we draw that HcPR10 as a cytokinin reservoir induces cytokinin-related signal transduction in plants, thereby promoting plant growth and development. These findings could provide intriguing insights into the role of HcPR10 proteins in phytohormone regulation in plants and advance our understanding of cytokinin-mediated plant development and could facilitate the breeding of transgenic crops with earlier mature, higher yielding agronomic traits.
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Affiliation(s)
- Yudan Feng
- Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi, China
| | - Yanpeng Ren
- Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education, College of Life Sciences, Beijing Normal University, Beijing, China
| | - Hua Zhang
- Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi, China
| | - Youqiang Heng
- Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi, China
| | - Zhanxin Wang
- Key Laboratory of Cell Proliferation and Regulation Biology of Ministry of Education, College of Life Sciences, Beijing Normal University, Beijing, China
| | - Yan Wang
- Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi, China
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Matušková V, Zatloukal M, Pospíšil T, Voller J, Vylíčilová H, Doležal K, Strnad M. From synthesis to the biological effect of isoprenoid 2'-deoxyriboside and 2',3'-dideoxyriboside cytokinin analogues. PHYTOCHEMISTRY 2023; 205:113481. [PMID: 36283448 DOI: 10.1016/j.phytochem.2022.113481] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 10/16/2022] [Accepted: 10/17/2022] [Indexed: 06/16/2023]
Abstract
Isoprenoid cytokinins are a class of naturally occurring plant signaling molecules. A series of prepared compounds derived from isoprenoid cytokinins (isopentenyladenine, trans-zeatin and cis-zeatin) with attached 2'-deoxy-d-ribose or 2',3'-dideoxy-d-ribose at the N9 position of the purine were prepared and their biological activities were examined. Different synthetic approaches were employed. The final compounds were characterized with variety of physicochemical methods (TLC, HPLC-MS, and NMR) and their cytokinin activity was determined in classical bioassays such as Amaranthus, tobacco callus, detached wheat leaf senescence and Arabidopsis thaliana root elongation inhibition assay. In addition, compounds were screened for activation of the cytokinin signaling pathway (bacterial receptor, competitive ligand binding and ARR5::GUS assay) to provide a detailed assessment of CK structure-activity relationship. The prepared compounds were found to be non-toxic to human cells and the majority of assays exhibited the highest activity of free bases while 2',3'-dideoxyribosides had very weak or no activity. In contrast to the free bases, all 2'-deoxyriboside derivatives were not toxic to tobacco callus even at the highest tested concentration (10-4 moL/l) and compound 1 (iPdR) induced betacyanin synthesis at higher concentration even stronger than iP free base in the Amaranthus bioassay. The general cytokinin activity pattern base > riboside >2'-deoxyriboside > 2',3'-dideoxyriboside was distinguished.
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Affiliation(s)
- Vlasta Matušková
- Department of Chemical Biology, Faculty of Science, Palacký University, Šlechtitelů 241/27, CZ-78371 Olomouc, Czech Republic.
| | - Marek Zatloukal
- Department of Chemical Biology, Faculty of Science, Palacký University, Šlechtitelů 241/27, CZ-78371 Olomouc, Czech Republic
| | - Tomáš Pospíšil
- Department of Chemical Biology, Faculty of Science, Palacký University, Šlechtitelů 241/27, CZ-78371 Olomouc, Czech Republic
| | - Jiří Voller
- Department of Experimental Biology, Faculty of Science, Palacký University, Šlechtitelů 241/27, CZ-78371 Olomouc, Czech Republic
| | - Hana Vylíčilová
- Department of Chemical Biology, Faculty of Science, Palacký University, Šlechtitelů 241/27, CZ-78371 Olomouc, Czech Republic
| | - Karel Doležal
- Department of Chemical Biology, Faculty of Science, Palacký University, Šlechtitelů 241/27, CZ-78371 Olomouc, Czech Republic; Laboratory of Growth Regulators, Faculty of Science, Institute of Experimental Botany of the Czech Academy of Sciences, Palacký University, Šlechtitelů 241/27, CZ-78371 Olomouc, Czech Republic
| | - Miroslav Strnad
- Laboratory of Growth Regulators, Faculty of Science, Institute of Experimental Botany of the Czech Academy of Sciences, Palacký University, Šlechtitelů 241/27, CZ-78371 Olomouc, Czech Republic
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7
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Savelieva EM, Zenchenko AA, Drenichev MS, Kozlova AA, Kurochkin NN, Arkhipov DV, Chizhov AO, Oslovsky VE, Romanov GA. In Planta, In Vitro and In Silico Studies of Chiral N6-Benzyladenine Derivatives: Discovery of Receptor-Specific S-Enantiomers with Cytokinin or Anticytokinin Activities. Int J Mol Sci 2022; 23:ijms231911334. [PMID: 36232653 PMCID: PMC9569578 DOI: 10.3390/ijms231911334] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 09/17/2022] [Accepted: 09/19/2022] [Indexed: 01/12/2023] Open
Abstract
Cytokinins, classical phytohormones, affect all stages of plant ontogenesis, but their application in agriculture is limited because of the lack of appropriate ligands, including those specific for individual cytokinin receptors. In this work, a series of chiral N6-benzyladenine derivatives were studied as potential cytokinins or anticytokinins. All compounds contained a methyl group at the α-carbon atom of the benzyl moiety, making them R- or S-enantiomers. Four pairs of chiral nucleobases and corresponding ribonucleosides containing various substituents at the C2 position of adenine heterocycle were synthesized. A nucleophilic substitution reaction by secondary optically active amines was used. A strong influence of the chirality of studied compounds on their interaction with individual cytokinin receptors of Arabidopsis thaliana was uncovered in in vivo and in vitro assays. The AHK2 and CRE1/AHK4 receptors were shown to have low affinity for the studied S-nucleobases while the AHK3 receptor exhibited significant affinity for most of them. Thereby, three synthetic AHK3-specific cytokinins were discovered: N6-((S)-α-methylbenzyl)adenine (S-MBA), 2-fluoro,N6-((S)-α-methylbenzyl)adenine (S-FMBA) and 2-chloro,N6-((S)-α-methylbenzyl)adenine (S-CMBA). Interaction patterns between individual receptors and specific enantiomers were rationalized by structure analysis and molecular docking. Two other S-enantiomers (N6-((S)-α-methylbenzyl)adenosine, 2-amino,N6-((S)-α-methylbenzyl)adenosine) were found to exhibit receptor-specific and chirality-dependent anticytokinin properties.
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Affiliation(s)
- Ekaterina M. Savelieva
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya str. 35, 127276 Moscow, Russia
| | - Anastasia A. Zenchenko
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str. 32, 119991 Moscow, Russia
| | - Mikhail S. Drenichev
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str. 32, 119991 Moscow, Russia
| | - Anna A. Kozlova
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str. 32, 119991 Moscow, Russia
| | - Nikolay N. Kurochkin
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str. 32, 119991 Moscow, Russia
| | - Dmitry V. Arkhipov
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya str. 35, 127276 Moscow, Russia
| | - Alexander O. Chizhov
- Zelinsky Institute of Organic Chemistry, Russian Academy of Science, Leninsky pr. 47, 119991 Moscow, Russia
| | - Vladimir E. Oslovsky
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str. 32, 119991 Moscow, Russia
| | - Georgy A. Romanov
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya str. 35, 127276 Moscow, Russia
- Correspondence: or
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8
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Cytokinin Perception in Ancient Plants beyond Angiospermae. Int J Mol Sci 2021; 22:ijms222313077. [PMID: 34884882 PMCID: PMC8657898 DOI: 10.3390/ijms222313077] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 11/29/2021] [Accepted: 11/30/2021] [Indexed: 11/17/2022] Open
Abstract
Cytokinins (CKs) control many plant developmental processes and responses to environmental cues. Although the CK signaling is well understood, we are only beginning to decipher its evolution. Here, we investigated the CK perception apparatus in early-divergent plant species such as bryophyte Physcomitrium patens, lycophyte Selaginella moellendorffii, and gymnosperm Picea abies. Of the eight CHASE-domain containing histidine kinases (CHKs) examined, two CHKs, PpCHK3 and PpCHK4, did not bind CKs. All other CHK receptors showed high-affinity CK binding (KD of nM range), with a strong preference for isopentenyladenine over other CK nucleobases in the moss and for trans-zeatin over cis-zeatin in the gymnosperm. The pH dependences of CK binding for these six CHKs showed a wide range, which may indicate different subcellular localization of these receptors at either the plasma- or endoplasmic reticulum membrane. Thus, the properties of the whole CK perception apparatuses in early-divergent lineages were demonstrated. Data show that during land plant evolution there was a diversification of the ligand specificity of various CHKs, in particular, the rise in preference for trans-zeatin over cis-zeatin, which indicates a steadily increasing specialization of receptors to various CKs. Finally, this distinct preference of individual receptors to different CK versions culminated in vascular plants, especially angiosperms.
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Tran LH, Urbanowicz A, Jasiński M, Jaskolski M, Ruszkowski M. 3D Domain Swapping Dimerization of the Receiver Domain of Cytokinin Receptor CRE1 From Arabidopsis thaliana and Medicago truncatula. FRONTIERS IN PLANT SCIENCE 2021; 12:756341. [PMID: 34630499 PMCID: PMC8498639 DOI: 10.3389/fpls.2021.756341] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 08/30/2021] [Indexed: 06/13/2023]
Abstract
Cytokinins are phytohormones regulating many biological processes that are vital to plants. CYTOKININ RESPONSE1 (CRE1), the main cytokinin receptor, has a modular architecture composed of a cytokinin-binding CHASE (Cyclases/Histidine kinases Associated Sensory Extracellular) domain, followed by a transmembrane fragment, an intracellular histidine kinase (HK) domain, and a receiver domain (REC). Perception of cytokinin signaling involves (i) a hormone molecule binding to the CHASE domain, (ii) CRE1 autophosphorylation at a conserved His residue in the HK domain, followed by a phosphorelay to (iii) a conserved Asp residue in the REC domain, (iv) a histidine-containing phosphotransfer protein (HPt), and (v) a response regulator (RR). This work focuses on the crystal structures of the REC domain of CRE1 from the model plant Arabidopsis thaliana and from the model legume Medicago truncatula. Both REC domains form tight 3D-domain-swapped dimers. Dimerization of the REC domain agrees with the quaternary assembly of the entire CRE1 but is incompatible with a model of its complex with HPt, suggesting that a considerable conformational change should occur to enable the signal transduction. Indeed, phosphorylation of the REC domain can change the HPt-binding properties of CRE1, as shown by functional studies.
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Affiliation(s)
- Linh H. Tran
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznań, Poland
| | - Anna Urbanowicz
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznań, Poland
| | - Michał Jasiński
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznań, Poland
- Department of Biochemistry and Biotechnology, Poznan University of Life Sciences, Poznań, Poland
| | - Mariusz Jaskolski
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznań, Poland
- Department of Crystallography, Faculty of Chemistry, A. Mickiewicz University, Poznań, Poland
| | - Milosz Ruszkowski
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznań, Poland
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The Hulks and the Deadpools of the Cytokinin Universe: A Dual Strategy for Cytokinin Production, Translocation, and Signal Transduction. Biomolecules 2021; 11:biom11020209. [PMID: 33546210 PMCID: PMC7913349 DOI: 10.3390/biom11020209] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 01/27/2021] [Accepted: 01/28/2021] [Indexed: 02/06/2023] Open
Abstract
Cytokinins are plant hormones, derivatives of adenine with a side chain at the N6-position. They are involved in many physiological processes. While the metabolism of trans-zeatin and isopentenyladenine, which are considered to be highly active cytokinins, has been extensively studied, there are others with less obvious functions, such as cis-zeatin, dihydrozeatin, and aromatic cytokinins, which have been comparatively neglected. To help explain this duality, we present a novel hypothesis metaphorically comparing various cytokinin forms, enzymes of CK metabolism, and their signalling and transporter functions to the comics superheroes Hulk and Deadpool. Hulk is a powerful but short-lived creation, whilst Deadpool presents a more subtle and enduring force. With this dual framework in mind, this review compares different cytokinin metabolites, and their biosynthesis, translocation, and sensing to illustrate the different mechanisms behind the two CK strategies. This is put together and applied to a plant developmental scale and, beyond plants, to interactions with organisms of other kingdoms, to highlight where future study can benefit the understanding of plant fitness and productivity.
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11
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Halawa M, Cortleven A, Schmülling T, Heyl A. Characterization of CHARK, an unusual cytokinin receptor of rice. Sci Rep 2021; 11:1722. [PMID: 33462253 PMCID: PMC7814049 DOI: 10.1038/s41598-020-80223-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 10/21/2020] [Indexed: 11/14/2022] Open
Abstract
The signal transduction of the plant hormone cytokinin is mediated by a His-to-Asp phosphorelay. The canonical cytokinin receptor consists of an extra cytoplasmic hormone binding domain named cyclase/histidine kinase associated sensory extracellular (CHASE) and cytoplasmic histidine kinase and receiver domains. In addition to classical cytokinin receptors, a different type receptor—named CHASE domain receptor serine/threonine kinase (CHARK)—is also present in rice. It contains the same ligand binding domain as other cytokinin receptors but has a predicted Ser/Thr—instead of a His-kinase domain. Bioinformatic analysis indicates that CHARK is a retrogene and a product of trans-splicing. Here, we analyzed whether CHARK can function as a bona fide cytokinin receptor. A biochemical assay demonstrated its ability to bind cytokinin. Transient expression of CHARK in protoplasts increased their response to cytokinin. Expression of CHARK in an Arabidopsis receptor double mutant complemented its growth defects and restored the ability to activate cytokinin response genes, clearly demonstrating that CHARK functions as a cytokinin receptor. We propose that the CHARK gene presents an evolutionary novelty in the cytokinin signaling system.
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Affiliation(s)
- Mhyeddeen Halawa
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Science, Freie Universität Berlin, Albrecht-Thaer-Weg 6, 14195, Berlin, Germany
| | - Anne Cortleven
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Science, Freie Universität Berlin, Albrecht-Thaer-Weg 6, 14195, Berlin, Germany
| | - Thomas Schmülling
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Science, Freie Universität Berlin, Albrecht-Thaer-Weg 6, 14195, Berlin, Germany
| | - Alexander Heyl
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Science, Freie Universität Berlin, Albrecht-Thaer-Weg 6, 14195, Berlin, Germany. .,Biology Department, Adelphi University, 1 South Avenue, Garden City, NY, 11530-0701, USA.
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12
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Takeuchi J, Fukui K, Seto Y, Takaoka Y, Okamoto M. Ligand-receptor interactions in plant hormone signaling. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 105:290-306. [PMID: 33278046 DOI: 10.1111/tpj.15115] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 11/23/2020] [Accepted: 11/30/2020] [Indexed: 05/28/2023]
Abstract
Small-molecule plant hormones principally control plant growth, development, differentiation, and environmental responses. Nine types of plant hormones are ubiquitous in angiosperms, and the molecular mechanisms of their hormone actions have been elucidated during the last two decades by genomic decoding of model plants with genetic mutants. In particular, the discovery of hormone receptors has greatly contributed to the understanding of signal transduction systems. The three-dimensional structure of the ligand-receptor complex has been determined for eight of the nine hormones by X-ray crystal structure analysis, and ligand perception mechanisms have been revealed at the atomic level. Collective research has revealed the molecular function of plant hormones that act as either molecular glue or an allosteric regulator for activation of receptors. In this review, we present an overview of the respective hormone signal transduction and describe the structural bases of ligand-receptor interactions.
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Affiliation(s)
- Jun Takeuchi
- Faculty of Agriculture, Shizuoka University, Shizuoka, 422-8529, Japan
| | - Kosuke Fukui
- Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Okayama, 700-0005, Japan
| | - Yoshiya Seto
- Department of Agricultural Chemistry, School of Agriculture, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki, Kanagawa, 214-8571, Japan
| | - Yousuke Takaoka
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan
| | - Masanori Okamoto
- Center for Bioscience Research and Education, Utsunomiya University, 350 Mine-cho, Utsunomiya, Tochigi, 321-8505, Japan
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13
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Lomin SN, Myakushina YA, Kolachevskaya OO, Getman IA, Savelieva EM, Arkhipov DV, Deigraf SV, Romanov GA. Global View on the Cytokinin Regulatory System in Potato. FRONTIERS IN PLANT SCIENCE 2020; 11:613624. [PMID: 33408733 PMCID: PMC7779595 DOI: 10.3389/fpls.2020.613624] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 11/19/2020] [Indexed: 06/12/2023]
Abstract
Cytokinins (CKs) were earlier shown to promote potato tuberization. Our study aimed to identify and characterize CK-related genes which constitute CK regulatory system in the core potato (Solanum tuberosum) genome. For that, CK-related genes were retrieved from the sequenced genome of the S. tuberosum doubled monoploid (DM) Phureja group, classified and compared with Arabidopsis orthologs. Analysis of selected gene expression was performed with a transcriptome database for the S. tuberosum heterozygous diploid line RH89-039-16. Genes responsible for CK signaling, biosynthesis, transport, and metabolism were categorized in an organ-specific fashion. According to this database, CK receptors StHK2/3 predominate in leaves and flowers, StHK4 in roots. Among phosphotransmitters, StHP1a expression largely predominates. Surprisingly, two pseudo-phosphotransmitters intended to suppress CK effects are hardly expressed in studied organs. Among B-type RR genes, StRR1b, StRR11, and StRR18a are actively expressed, with StRR1b expressing most uniformly in all organs and StRR11 exhibiting the highest expression in roots. By cluster analysis four types of prevailing CK-signaling chains were identified in (1) leaves and flowers, StHK2/3→S t H P1a→StRR1b/+; (2) shoot apical meristems, stolons, and mature tubers, StHK2/4→S t H P1a→StRR1b/+; (3) stems and young tubers, StHK2/4→S t H P1a→StRR1b/11/18a; and (4) roots and tuber sprouts, StHK4→S t H P1a→StRR11/18a. CK synthesis genes StIPT3/5 and StCYP735A are expressed mainly in roots followed by tuber sprouts, but rather weakly in stolons and tubers. By contrast, CK-activation genes StLOGs are active in stolons, and StLOG3b expression is even stolon-confined. Apparently, the main CK effects on tuber initiation are realized via activity of StLOG1/3a/3b/7c/8a genes in stolons. Current advances and future directions in potato research are discussed.
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Aremu AO, Fawole OA, Makunga NP, Masondo NA, Moyo M, Buthelezi NMD, Amoo SO, Spíchal L, Doležal K. Applications of Cytokinins in Horticultural Fruit Crops: Trends and Future Prospects. Biomolecules 2020; 10:biom10091222. [PMID: 32842660 PMCID: PMC7563339 DOI: 10.3390/biom10091222] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2020] [Revised: 08/15/2020] [Accepted: 08/17/2020] [Indexed: 12/15/2022] Open
Abstract
Cytokinins (CKs) are a chemically diverse class of plant growth regulators, exhibiting wide-ranging actions on plant growth and development, hence their exploitation in agriculture for crop improvement and management. Their coordinated regulatory effects and cross-talk interactions with other phytohormones and signaling networks are highly sophisticated, eliciting and controlling varied biological processes at the cellular to organismal levels. In this review, we briefly introduce the mode of action and general molecular biological effects of naturally occurring CKs before highlighting the great variability in the response of fruit crops to CK-based innovations. We present a comprehensive compilation of research linked to the application of CKs in non-model crop species in different phases of fruit production and management. By doing so, it is clear that the effects of CKs on fruit set, development, maturation, and ripening are not necessarily generic, even for cultivars within the same species, illustrating the magnitude of yet unknown intricate biochemical and genetic mechanisms regulating these processes in different fruit crops. Current approaches using genomic-to-metabolomic analysis are providing new insights into the in planta mechanisms of CKs, pinpointing the underlying CK-derived actions that may serve as potential targets for improving crop-specific traits and the development of new solutions for the preharvest and postharvest management of fruit crops. Where information is available, CK molecular biology is discussed in the context of its present and future implications in the applications of CKs to fruits of horticultural significance.
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Affiliation(s)
- Adeyemi O. Aremu
- Indigenous Knowledge Systems Centre, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2745, South Africa;
- Food Security and Safety Niche Area, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2745, South Africa
- Correspondence: (A.O.A.); (O.A.F.); (N.P.M.); Tel.: +27-18-389-2573 (A.O.A.); +27-11-559-7237 (O.A.F.); +27-21-808-3061 (N.P.M.)
| | - Olaniyi A. Fawole
- Postharvest Research Laboratory, Department of Botany and Plant Biotechnology, Faculty of Science, University of Johannesburg, Auckland Park Kingsway Campus, P.O. Box 524, Auckland Park 2006, South Africa;
- Correspondence: (A.O.A.); (O.A.F.); (N.P.M.); Tel.: +27-18-389-2573 (A.O.A.); +27-11-559-7237 (O.A.F.); +27-21-808-3061 (N.P.M.)
| | - Nokwanda P. Makunga
- Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa;
- Correspondence: (A.O.A.); (O.A.F.); (N.P.M.); Tel.: +27-18-389-2573 (A.O.A.); +27-11-559-7237 (O.A.F.); +27-21-808-3061 (N.P.M.)
| | - Nqobile A. Masondo
- Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa;
| | - Mack Moyo
- Department of Horticulture, Faculty of Applied Sciences, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa;
| | - Nana M. D. Buthelezi
- Postharvest Research Laboratory, Department of Botany and Plant Biotechnology, Faculty of Science, University of Johannesburg, Auckland Park Kingsway Campus, P.O. Box 524, Auckland Park 2006, South Africa;
| | - Stephen O. Amoo
- Indigenous Knowledge Systems Centre, Faculty of Natural and Agricultural Sciences, North-West University, Private Bag X2046, Mmabatho 2745, South Africa;
- Postharvest Research Laboratory, Department of Botany and Plant Biotechnology, Faculty of Science, University of Johannesburg, Auckland Park Kingsway Campus, P.O. Box 524, Auckland Park 2006, South Africa;
- Agricultural Research Council, Roodeplaat Vegetable and Ornamental Plants, Private Bag X293, Pretoria 0001, South Africa
| | - Lukáš Spíchal
- Department of Chemical Biology and Genetics, Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University, Šlechtitelů 27, CZ-783 71 Olomouc, Czech Republic; (L.S.); (K.D.)
| | - Karel Doležal
- Department of Chemical Biology and Genetics, Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University, Šlechtitelů 27, CZ-783 71 Olomouc, Czech Republic; (L.S.); (K.D.)
- Laboratory of Growth Regulators, Faculty of Science, Palacký University & Institute of Experimental Botany AS CR, Šlechtitelů 11, CZ-783 71 Olomouc, Czech Republic
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15
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Oshchepkov MS, Kalistratova AV, Savelieva EM, Romanov GA, Bystrova NA, Kochetkov KA. Natural and synthetic cytokinins and their applications in biotechnology, agrochemistry and medicine. RUSSIAN CHEMICAL REVIEWS 2020. [DOI: 10.1070/rcr4921] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The review is devoted to cytokinins — classical plant hormones known for more than six decades. Nevertheless, different aspects of the action of cytokinins are still being investigated. Relevant studies produced interesting, often unexpected, results, which cast doubt on the old paradigms and open new prospects for the use of these phytohormones. Particular attention is given to recent advances in the applications of natural cytokinins and their synthetic analogues in biotechnology, agriculture, medicine and cosmetics. The chemical synthesis, properties and the possible use of artificial cytokinins are considered in detail. The review is aimed at researchers interested in the development and applications of new biologically active compounds with a wide spectrum of action on diverse biological objects, from plants to humans.
The bibliography includes 233 references.
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16
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Wheeldon CD, Bennett T. There and back again: An evolutionary perspective on long-distance coordination of plant growth and development. Semin Cell Dev Biol 2020; 109:55-67. [PMID: 32576500 DOI: 10.1016/j.semcdb.2020.06.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 06/09/2020] [Accepted: 06/16/2020] [Indexed: 12/17/2022]
Abstract
Vascular plants, unlike bryophytes, have a strong root-shoot dichotomy in which the tissue systems are mutually interdependent; roots are completely dependent on shoots for photosynthetic sugars, and shoots are completely dependent on roots for water and mineral nutrients. Long-distance communication between shoot and root is therefore critical for the growth, development and survival of vascular plants, especially with regard to variable environmental conditions. However, this long-distance signalling does not appear an ancestral feature of land plants, and has likely arisen in vascular plants to service the radical alterations in body-plan seen in this taxon. In this review, we examine the defined hormonal root-to-shoot and shoot-to-root signalling pathways that coordinate the growth of vascular plants, with a particular view to understanding how these pathways may have evolved. We highlight the completely divergent roles of isopentenyl-adenine and trans-zeatin cytokinin species in long-distance signalling, and ask whether cytokinin can really be considered as a single class of hormones in the light of recent research. We also discuss the puzzlingly sparse evidence for auxin as a shoot-to-root signal, the evolutionary re-purposing of strigolactones and gibberellins as hormonal signals, and speculate on the possible role of sugars as long-distance signals. We conclude by discussing the 'design principles' of long-distance signalling in vascular plants.
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Affiliation(s)
- Cara D Wheeldon
- School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK
| | - Tom Bennett
- School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, UK.
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17
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Liu P, Wang S, Wang X, Yang X, Li Q, Wang C, Chen C, Shi Q, Ren Z, Wang L. Genome-wide characterization of two-component system (TCS) genes in melon (Cucumis melo L.). PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 151:197-213. [PMID: 32229405 DOI: 10.1016/j.plaphy.2020.03.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 03/12/2020] [Accepted: 03/14/2020] [Indexed: 06/10/2023]
Abstract
To better understand cytokinin signaling in melon (Cucumis melo L.), one of the most important fruit crops in the Cucurbitaceae family, we identified and characterized melon two-component system (TCS) genes in this study. The results showed that there were 51 genes encoding putative TCS proteins in melon, and these TCS genes were classified into 3 subgroups, with 17 HK(L)s (histidine kinase/histidine-kinase like; 9 HKs and 8 HKLs), 9 HPs (histidine phosphotransfer proteins; 6 authentic and 3 pseudo), and 25 RRs (response regulators; 8 Type-A, 11 Type-B and 6 pseudo). The identity values of these cytokinin signaling proteins were revealed by analyzing their conserved motifs, domains and amino acid sequences. By analyzing TCS genes in different plant species, we found that melon HK(L)s, HPs and RRs had closer phylogenetic relationships with cucumber genes than with the genes of other plants, and the expansion of melon cytokinin signaling genes might be attributed to segmental duplication events. Analysis of the putative promoter regions (2-kb upstream regions of the start codon) revealed the enrichment of stress- and hormone-response cis-elements. The involvement of these putative TCS genes in melon cytokinin signaling was further supported by qRT-PCR data.
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Affiliation(s)
- Panjing Liu
- State Key Laboratory of Crop Biology, Tai'an, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Tai'an, China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, China
| | - Shuoshuo Wang
- State Key Laboratory of Crop Biology, Tai'an, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Tai'an, China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, China
| | - Xiangfei Wang
- State Key Laboratory of Crop Biology, Tai'an, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Tai'an, China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, China
| | - Xiaoyu Yang
- College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
| | - Qiang Li
- State Key Laboratory of Crop Biology, Tai'an, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Tai'an, China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, China
| | - Chao Wang
- State Key Laboratory of Crop Biology, Tai'an, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Tai'an, China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, China
| | - Chunhua Chen
- State Key Laboratory of Crop Biology, Tai'an, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Tai'an, China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, China
| | - Qinghua Shi
- State Key Laboratory of Crop Biology, Tai'an, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Tai'an, China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, China
| | - Zhonghai Ren
- State Key Laboratory of Crop Biology, Tai'an, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Tai'an, China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, China.
| | - Lina Wang
- State Key Laboratory of Crop Biology, Tai'an, China; Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Huanghuai Region), Tai'an, China; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, China.
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18
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Arkhipov DV, Lomin SN, Myakushina YA, Savelieva EM, Osolodkin DI, Romanov GA. Modeling of Protein⁻Protein Interactions in Cytokinin Signal Transduction. Int J Mol Sci 2019; 20:E2096. [PMID: 31035389 PMCID: PMC6539988 DOI: 10.3390/ijms20092096] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 04/23/2019] [Accepted: 04/24/2019] [Indexed: 01/20/2023] Open
Abstract
The signaling of cytokinins (CKs), classical plant hormones, is based on the interaction of proteins that constitute the multistep phosphorelay system (MSP): catalytic receptors-sensor histidine kinases (HKs), phosphotransmitters (HPts), and transcription factors-response regulators (RRs). Any CK receptor was shown to interact in vivo with any of the studied HPts and vice versa. In addition, both of these proteins tend to form a homodimer or a heterodimeric complex with protein-paralog. Our study was aimed at explaining by molecular modeling the observed features of in planta protein-protein interactions, accompanying CK signaling. For this purpose, models of CK-signaling proteins' structure from Arabidopsis and potato were built. The modeled interaction interfaces were formed by rather conserved areas of protein surfaces, complementary in hydrophobicity and electrostatic potential. Hot spots amino acids, determining specificity and strength of the interaction, were identified. Virtual phosphorylation of conserved Asp or His residues affected this complementation, increasing (Asp-P in HK) or decreasing (His-P in HPt) the affinity of interacting proteins. The HK-HPt and HPt-HPt interfaces overlapped, sharing some of the hot spots. MSP proteins from Arabidopsis and potato exhibited similar properties. The structural features of the modeled protein complexes were consistent with the experimental data.
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Affiliation(s)
- Dmitry V Arkhipov
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia.
| | - Sergey N Lomin
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia.
| | - Yulia A Myakushina
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia.
| | - Ekaterina M Savelieva
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia.
| | - Dmitry I Osolodkin
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia.
- FSBSI "Chumakov FSC R&D IBP RAS", Poselok Instituta Poliomelita 8 bd. 1, Poselenie Moskovsky, 108819 Moscow, Russia.
- Institute of Translational Medicine and Biotechnology, Sechenov First Moscow State Medical University, Trubetskaya ul. 8, 119991 Moscow, Russia.
| | - Georgy A Romanov
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia.
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory 1, Bld. 40, 119992 Moscow, Russia.
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19
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Lomin SN, Myakushina YA, Kolachevskaya OO, Getman IA, Arkhipov DV, Savelieva EM, Osolodkin DI, Romanov GA. Cytokinin perception in potato: new features of canonical players. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:3839-3853. [PMID: 29800344 PMCID: PMC6054150 DOI: 10.1093/jxb/ery199] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 05/15/2018] [Indexed: 05/11/2023]
Abstract
Potato is the most economically important non-cereal food crop. Tuber formation in potato is regulated by phytohormones, cytokinins (CKs) in particular. The present work studied CK signal perception in potato. The sequenced potato genome of doubled monoploid Phureja was used for bioinformatic analysis and as a tool for identification of putative CK receptors from autotetraploid potato cv. Désirée. All basic elements of multistep phosphorelay required for CK signal transduction were identified in the Phureja genome, including three genes orthologous to three CK receptor genes (AHK 2-4) of Arabidopsis. As distinct from Phureja, autotetraploid potato contains at least two allelic isoforms of each receptor type. Putative receptor genes from Désirée plants were cloned, sequenced and expressed, and the main characteristics of encoded proteins were determined, in particular their consensus motifs, modelled structure, ligand-binding properties, and ability to transmit CK signals. In all studied aspects the predicted sensor histidine kinases met the requirements for genuine CK receptors. Expression of potato CK receptors was found to be organ-specific and sensitive to growth conditions, particularly to sucrose content. Our results provide a solid basis for further in-depth study of CK signaling system and biotechnological improvement of potato.
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Affiliation(s)
- Sergey N Lomin
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, Russia
| | - Yulia A Myakushina
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, Russia
| | | | - Irina A Getman
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, Russia
| | - Dmitry V Arkhipov
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, Russia
| | - Ekaterina M Savelieva
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, Russia
| | - Dmitry I Osolodkin
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, Russia
- Institute of Poliomyelitis and Viral Encephalitides, FSBSI Chumakov FSC R&D IBP RAS, Poselok Instituta Poliomelita 8 bd 1, Poselenie Moskovsky, Moscow, Russia
- Sechenov First Moscow State Medical University, Moscow, Russia
| | - Georgy A Romanov
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Moscow, Russia
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory, Moscow, Russia
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Abstract
It was recently reported that the human-exclusive pathogen Mycobacterium tuberculosis secretes cytokinins, which had only been known as plant hormones. While cytokinins are well-established, adenine-based signaling molecules in plants, they have never been shown to participate in signal transduction in other kingdoms of life. M. tuberculosis is not known to interact with plants. Therefore, we tested the hypothesis that cytokinins trigger transcriptional changes within this bacterial species. Here, we show cytokinins induced the strong expression of the M. tuberculosis gene Rv0077c. We found that Rv0077c expression is repressed by a TetR-like transcriptional repressor, Rv0078. Strikingly, cytokinin-induced expression of Rv0077c resulted in a loss of acid-fast staining of M. tuberculosis While acid-fast staining is thought to be associated with changes in the bacterial cell envelope and virulence, Rv0077c-induced loss of acid-fastness did not affect antibiotic susceptibility or attenuate bacterial growth in mice, consistent with an unaltered mycolic acid profile of Rv0077c-expressing cells. Collectively, these findings show cytokinins signal transcriptional changes that can affect M. tuberculosis acid-fastness and that cytokinin signaling is no longer limited to the kingdom Plantae.IMPORTANCE Cytokinins have only previously been known as plant hormones. The discovery that they can be used as signaling molecules outside of plants broadens the repertoire of small molecules that can potentially affect gene expression in all domains of life.
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21
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Savelieva EM, Oslovsky VE, Karlov DS, Kurochkin NN, Getman IA, Lomin SN, Sidorov GV, Mikhailov SN, Osolodkin DI, Romanov GA. Cytokinin activity of N 6-benzyladenine derivatives assayed by interaction with the receptors in planta, in vitro, and in silico. PHYTOCHEMISTRY 2018; 149:161-177. [PMID: 29544164 DOI: 10.1016/j.phytochem.2018.02.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Revised: 02/11/2018] [Accepted: 02/14/2018] [Indexed: 06/08/2023]
Abstract
Biological effects of hormones in both plants and animals are based on high-affinity interaction with cognate receptors resulting in their activation. The signal of cytokinins, classical plant hormones, is perceived in Arabidopsis by three homologous membrane receptors: AHK2, AHK3, and CRE1/AHK4. To study the cytokinin-receptor interaction, we used 25 derivatives of potent cytokinin N6-benzyladenine (BA) with substituents in the purine heterocycle and/or in the side chain. The study was focused primarily on individual cytokinin receptors from Arabidopsis. The main in planta assay system was based on Arabidopsis double mutants retaining only one isoform of cytokinin receptors and harboring cytokinin-sensitive reporter gene. Classical cytokinin biotest with Amaranthus seedlings was used as an additional biotest. In parallel, the binding of ligands to individual cytokinin receptors was assessed in the in vitro test system. Quantitative comparison of results of different assays confirmed the partial similarity of ligand-binding properties of receptor isoforms. Substituents at positions 8 and 9 of adenine moiety, elongated linker up to 4 methylene units, and replacement of N6 by sulfur or oxygen have resulted in the suppression of cytokinin activity of the derivative toward all receptors. Introduction of a halogen into position 2 of adenine moiety, on the contrary, often increased the ligand activity, especially toward AHK3. Features both common and distinctive of cytokinin receptors in Arabidopsis and Amaranthus were revealed, highlighting species specificity of the cytokinin perception apparatus. Correlations between the extent to which a compound binds to a receptor in vitro and its ability to activate the same receptor in planta were evaluated for each AHK protein. Interaction patterns between individual receptors and ligands were rationalized by structure analysis and molecular docking in sensory modules of AHK receptors. The best correlation between docking scores and specific binding was observed for AHK3. In addition, receptor-specific ligands have been discovered with unique properties to predominantly activate or block distinct cytokinin receptors. These ligands are promising for practical application and as molecular tools in the study of the cytokinin perception by plant cells.
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Affiliation(s)
- Ekaterina M Savelieva
- Laboratory of Signaling Systems of Ontogeny Control, Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia.
| | - Vladimir E Oslovsky
- Laboratory of Design and Synthesis of Biologically Active Compounds, Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov Str. 32, 119991 Russia.
| | - Dmitry S Karlov
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, Moscow, 143026 Russia; Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia; Institute of Physiologically Active Compounds, Russian Academy of Sciences, Severny Proezd 1, Chernogolovka, Moscow Region, 142432 Russia.
| | - Nikolay N Kurochkin
- Laboratory of Design and Synthesis of Biologically Active Compounds, Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov Str. 32, 119991 Russia.
| | - Irina A Getman
- Laboratory of Signaling Systems of Ontogeny Control, Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia.
| | - Sergey N Lomin
- Laboratory of Signaling Systems of Ontogeny Control, Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia.
| | - Georgy V Sidorov
- Laboratory of Isotope Labelled Physiologically Active Compounds, Institute of Molecular Genetics, Russian Academy of Sciences, Pl. Akad. Kurchatova 2, 123182 Moscow, Russia.
| | - Sergey N Mikhailov
- Laboratory of Design and Synthesis of Biologically Active Compounds, Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov Str. 32, 119991 Russia.
| | - Dmitry I Osolodkin
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia; Institute of Poliomyelitis and Viral Encephalitides, FSBSI Chumakov FSC R&D IBP RAS, Poselok Instituta Poliomelita 8 bd. 1, Poselenie Moskovsky, Moscow 108819, Russia; Institute of Pharmacy and Translational Medicine, Sechenov First Moscow State Medical University, Trubetskaya Str. 8, Moscow 119991, Russia.
| | - Georgy A Romanov
- Laboratory of Signaling Systems of Ontogeny Control, Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia; Department of Molecular Basis of Ontogenesis, Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory 1, Bld. 40, 119992 Moscow, Russia.
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Romanov GA, Lomin SN, Schmülling T. Cytokinin signaling: from the ER or from the PM? That is the question! THE NEW PHYTOLOGIST 2018; 218:41-53. [PMID: 29355964 DOI: 10.1111/nph.14991] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 12/02/2017] [Indexed: 05/06/2023]
Abstract
Content Summary 47 I. Introduction 47 II. Historical outline 48 III. Recent developments 49 IV. Towards an integrative concept for cytokinin receptor signaling 54 Acknowledgements 57 References 57 SUMMARY: Cytokinin signaling plays an important role in plant growth and development, and therefore its molecular characteristics are under extensive study. One characteristic is the subcellular localization of cytokinin signal initiation. This localization determines both the pathway for hormone delivery to the receptor, as well as molecular aspects of signal transfer to the primary cellular targets. Subcellular sites for the onset of cytokinin signaling are still uncertain and experimental data are in part controversial. A few years ago, cytokinin receptors were shown to be localized predominantly in the membrane of the endoplasmic reticulum (ER) and to possess some features, such as their pH activity profile, typical for intracellular proteins. Very recently, new data corroborating the functionality of ER-located cytokinin receptors were reported. However, other work argued for cytokinin perception to occur at the plasma membrane (PM). Here, we discuss in detail these partially conflicting data and present an integrative model for cytokinin perception and signaling. In our opinion, the prevailing evidence argues for the ER being the predominant site of cytokinin signal perception but also that signal initiation at the PM might be relevant in some circumstances as well. The roles of these pathways in long-distance, paracrine and autocrine cytokinin signaling are discussed.
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Affiliation(s)
- Georgy A Romanov
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, Moscow, 127276, Russia
| | - Sergey N Lomin
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, Moscow, 127276, Russia
| | - Thomas Schmülling
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences (DCPS), Freie Universität Berlin, Albrecht-Thaer-Weg 6, Berlin, D-14195, Germany
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23
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Lomin SN, Myakushina YA, Arkhipov DV, Leonova OG, Popenko VI, Schmülling T, Romanov GA. Studies of cytokinin receptor-phosphotransmitter interaction provide evidences for the initiation of cytokinin signalling in the endoplasmic reticulum. FUNCTIONAL PLANT BIOLOGY : FPB 2018; 45:192-202. [PMID: 32291033 DOI: 10.1071/fp16292] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Accepted: 01/11/2017] [Indexed: 05/06/2023]
Abstract
Cytokinin receptors were shown recently to be localised mainly to the endoplasmic reticulum (ER); however, the activity of ER-located receptors was not proven. We have therefore tested the functionality of ER-located Arabidopsis receptors. The first step of cytokinin signal transduction is the transfer of a phosphoryl group from the activated receptor to a phosphotransfer protein. To determine the subcellular localisation of receptor-phosphotransmitter interaction in planta, BiFC experiments were performed. Receptors ARABIDOPSIS HISTIDINE KINASE 2 (AHK2), AHK3 and AHK4 (CRE1) and phosphotransmitters ARABIDOPSIS HISTIDINE-CONTAINING PHOSPHOTRANSMITTER 1 (AHP1), AHP2 and AHP3 fused to split-eYFP were transiently expressed in Nicotiana benthamiana leaves. Receptor-phosphotransmitter pairs were shown to interact in every possible combination in a pattern reflecting the ER. Receptor dimers, an active form of the receptors, were also detected in the ER. According to BiFC and protease protection data, the catalytic part of AHK3 was located in the cytoplasm whereas the hormone binding module faced the ER lumen. This topology is consistent with receptor signalling from the ER membrane. Finally, the functionality of receptors in different membrane fractions was tested using an in vitro kinase assay visualising the phosphorylation of phosphotransfer proteins. The detected cytokinin-dependent phosphotransfer activity was confined mainly to the ER-enriched fraction. Collectively, our data demonstrate that ER-located cytokinin receptors are active in cytokinin signal transduction. Hence, intracellular cytokinins appear to play an essential role in cytokinin signalling. An updated model for the spatial organisation of cytokinin transport form activation, intracellular trafficking and signalling from the ER is proposed.
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Affiliation(s)
- Sergey N Lomin
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya str. 35, 127276 Moscow, Russia
| | - Yulia A Myakushina
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya str. 35, 127276 Moscow, Russia
| | - Dmitry V Arkhipov
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya str. 35, 127276 Moscow, Russia
| | - Olga G Leonova
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str. 32, 119991 Moscow, Russia
| | - Vladimir I Popenko
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str. 32, 119991 Moscow, Russia
| | - Thomas Schmülling
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences, Freie Universität Berlin, Albrecht-Thaer-Weg 6, D-14195 Berlin, Germany
| | - Georgy A Romanov
- Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya str. 35, 127276 Moscow, Russia
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24
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Daudu D, Allion E, Liesecke F, Papon N, Courdavault V, Dugé de Bernonville T, Mélin C, Oudin A, Clastre M, Lanoue A, Courtois M, Pichon O, Giron D, Carpin S, Giglioli-Guivarc’h N, Crèche J, Besseau S, Glévarec G. CHASE-Containing Histidine Kinase Receptors in Apple Tree: From a Common Receptor Structure to Divergent Cytokinin Binding Properties and Specific Functions. FRONTIERS IN PLANT SCIENCE 2017; 8:1614. [PMID: 28979279 PMCID: PMC5611679 DOI: 10.3389/fpls.2017.01614] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 09/04/2017] [Indexed: 05/07/2023]
Abstract
Cytokinin signaling is a key regulatory pathway of many aspects in plant development and environmental stresses. Herein, we initiated the identification and functional characterization of the five CHASE-containing histidine kinases (CHK) in the economically important Malus domestica species. These cytokinin receptors named MdCHK2, MdCHK3a/MdCHK3b, and MdCHK4a/MdCHK4b by homology with Arabidopsis AHK clearly displayed three distinct profiles. The three groups exhibited architectural variations, especially in the N-terminal part including the cytokinin sensing domain. Using a yeast complementation assay, we showed that MdCHK2 perceives a broad spectrum of cytokinins with a substantial sensitivity whereas both MdCHK4 homologs exhibit a narrow spectrum. Both MdCHK3 homologs perceived some cytokinins but surprisingly they exhibited a basal constitutive activity. Interaction studies revealed that MdCHK2, MdCHK4a, and MdCHK4b homodimerized whereas MdCHK3a and MdCHK3b did not. Finally, qPCR analysis and bioinformatics approach pointed out contrasted expression patterns among the three MdCHK groups as well as distinct sets of co-expressed genes. Our study characterized for the first time the five cytokinin receptors in apple tree and provided a framework for their further functional studies.
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Affiliation(s)
- Dimitri Daudu
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - Elsa Allion
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - Franziska Liesecke
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - Nicolas Papon
- EA 3142 Groupe d’Etude des Interactions Hôte-Pathogène, Université AngersAngers, France
| | - Vincent Courdavault
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | | | - Céline Mélin
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - Audrey Oudin
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - Marc Clastre
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - Arnaud Lanoue
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - Martine Courtois
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - Olivier Pichon
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - David Giron
- UMR 7261 Institut de Recherche sur la Biologie de l’Insecte, Centre National de la Recherche Scientifique (CNRS), Université François-RabelaisTours, France
| | - Sabine Carpin
- EA 1207 Laboratoire de Biologie des Ligneux et des Grandes Cultures, Université d’OrléansOrléans, France
| | | | - Joël Crèche
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - Sébastien Besseau
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
| | - Gaëlle Glévarec
- EA 2106 Biomolécules et Biotechnologies Végétales, Université François-RabelaisTours, France
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Takano S, Matsuda S, Funabiki A, Furukawa JI, Yamauchi T, Tokuji Y, Nakazono M, Shinohara Y, Takamure I, Kato K. The rice RCN11 gene encodes β1,2-xylosyltransferase and is required for plant responses to abiotic stresses and phytohormones. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2015; 236:75-88. [PMID: 26025522 DOI: 10.1016/j.plantsci.2015.03.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 03/17/2015] [Accepted: 03/30/2015] [Indexed: 05/23/2023]
Abstract
Seed germination rates and plant development and growth under abiotic stress are important aspects of crop productivity. Here, our characterization of the rice (Oryza sativa L.) mutant reduced culm number11 (rcn11) showed that RCN11 controls growth of plants exposed to abnormal temperature, salinity and drought conditions. RCN11 also mediates root aerenchyma formation under oxygen-deficient conditions and ABA sensitivity during seed germination. Molecular studies showed that the rcn11 mutation resulted from a 966-bp deletion that caused loss of function of β1,2-xylosyltransferase (OsXylT). This enzyme is located in the Golgi apparatus where it catalyzes the transfer of xylose from UDP-xylose to the core β-linked mannose of N-glycans. RCN11/OsXylT promoter activity was observed in the basal part of the shoot containing the shoot and axillary meristems and in the base of crown roots. The level of RCN11/OsXylT expression was regulated by multiple phytohormones and various abiotic stresses suggesting that plant specific N-glycosylation is regulated by multiple signals in rice plants. The present study is the first to demonstrate that rice β1,2-linked xylose residues on N-glycans are critical for seed germination and plant development and growth under conditions of abiotic stress.
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Affiliation(s)
- Sho Takano
- Department of Agro-environmental Science, Obihiro University of Agricultural and Veterinary Medicine, 2-11 Nishi, Inada, Obihiro, Hokkaido 080-8555, Japan
| | - Shuichi Matsuda
- Department of Agro-environmental Science, Obihiro University of Agricultural and Veterinary Medicine, 2-11 Nishi, Inada, Obihiro, Hokkaido 080-8555, Japan
| | - Atsushi Funabiki
- Department of Agro-environmental Science, Obihiro University of Agricultural and Veterinary Medicine, 2-11 Nishi, Inada, Obihiro, Hokkaido 080-8555, Japan
| | - Jun-ichi Furukawa
- Graduate School of Advanced Life Science, Laboratory of Advanced Chemical Biology, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Takaki Yamauchi
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8601, Japan
| | - Yoshihiko Tokuji
- Department of Food Science, Obihiro University of Agricultural and Veterinary Medicine, 2-11 Nishi, Inada, Obihiro, Hokkaido 080-8555, Japan
| | - Mikio Nakazono
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8601, Japan
| | - Yasuro Shinohara
- Graduate School of Advanced Life Science, Laboratory of Advanced Chemical Biology, Hokkaido University, Kita 10 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Itsuro Takamure
- Graduate School of Agriculture, Hokkaido University, Kita 9 Nishi 9, Kita-ku, Sapporo, Hokkaido 060-8589, Japan
| | - Kiyoaki Kato
- Department of Agro-environmental Science, Obihiro University of Agricultural and Veterinary Medicine, 2-11 Nishi, Inada, Obihiro, Hokkaido 080-8555, Japan.
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26
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Lomin SN, Krivosheev DM, Steklov MY, Arkhipov DV, Osolodkin DI, Schmülling T, Romanov GA. Plant membrane assays with cytokinin receptors underpin the unique role of free cytokinin bases as biologically active ligands. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:1851-63. [PMID: 25609827 PMCID: PMC4378623 DOI: 10.1093/jxb/eru522] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 12/05/2014] [Accepted: 12/19/2014] [Indexed: 05/18/2023]
Abstract
Cytokinin receptors play a key role in cytokinin-dependent processes regulating plant growth, development, and adaptation; therefore, the functional properties of these receptors are of great importance. Previously the properties of cytokinin receptors were investigated in heterologous assay systems using unicellular microorganisms, mainly bacteria, expressing receptor proteins. However, within microorganisms receptors reside in an alien environment that might distort the receptor properties. Therefore, a new assay system has been developed allowing studies of individual receptors within plant membranes (i.e. closer to their natural environment). The main ligand-binding characteristics of receptors from Arabidopsis [AHK2, AHK3, and AHK4] and maize (ZmHK1) were refined in this new system, and the properties of full-length Arabidopsis receptor AHK2 were characterized for the first time. Ligand specificity profiles of receptors towards cytokinin bases were comparable with the profiles retrieved in bacterial assay systems. In contrast, cytokinin-9-ribosides displayed a strongly reduced affinity for receptors in the plant assay system, indicating that ribosides as the common transport form of cytokinins have no or very weak cytokinin activity. This underpins the central role of free bases as the sole biologically active cytokinin compounds. According to molecular modelling and docking studies, N (9)-ribosylation alters the bonding pattern in cytokinin-receptor interaction and prevents β6-β7 loop movement important for tight hormone binding. A common feature of all receptors was a greatly reduced ligand binding at low (5.0-5.5) pH. The particularly high sensitivity of ZmHK1 to pH changes leads to the suggestion that some cytokinin receptors may play an additional role as pH sensors in the lumen of the endoplasmic reticulum.
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Affiliation(s)
- Sergey N Lomin
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia
| | - Dmitry M Krivosheev
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia
| | - Mikhail Yu Steklov
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia
| | - Dmitry V Arkhipov
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia
| | - Dmitry I Osolodkin
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1/3, 119991 Moscow, Russia
| | - Thomas Schmülling
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences, Freie Universität Berlin, Albrecht-Thaer-Weg 6, D-14195 Berlin, Germany
| | - Georgy A Romanov
- Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory 1, 119992 Moscow, Russia
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27
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Gruhn N, Seidl MF, Halawa M, Heyl A. Members of a recently discovered subfamily of cytokinin receptors display differences and similarities to their classical counterparts. PLANT SIGNALING & BEHAVIOR 2015; 10:e984512. [PMID: 25826259 PMCID: PMC4623499 DOI: 10.4161/21659087.2014.984512] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 10/13/2014] [Accepted: 10/13/2014] [Indexed: 05/05/2023]
Abstract
Cytokinins represent a group of plant hormones that have been shown to be essential for plant growth and development. A recent large-scale phylogenetic analysis of components of the cytokinin signal transduction pathway revealed, among other findings, the existence of a second, previously unknown subfamily of cytokinin receptors. Here we report that the cytokinin binding domains of the members of the 2 subfamilies contain residues that are highly conserved in either or in both subfamilies. Experiments using fluorescence microscopy hint at an ER and a plasma membrane localization for 2 members of the newly identified subfamily. These data provide new insights in the conservation of sequence and localization properties among the 2 subfamilies.
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Affiliation(s)
- Nijuscha Gruhn
- Institute of Biology/Applied Genetics; Dahlem Centre of Plant Sciences; Freie Universität; Berlin, Germany
| | - Michael F Seidl
- Laboratory of Phytopathology; Wageningen University; Wageningen, The Netherlands
| | - Mhyeddeen Halawa
- Institute of Biology/Applied Genetics; Dahlem Centre of Plant Sciences; Freie Universität; Berlin, Germany
| | - Alexander Heyl
- Institute of Biology/Applied Genetics; Dahlem Centre of Plant Sciences; Freie Universität; Berlin, Germany
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28
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Kuderová A, Gallová L, Kuricová K, Nejedlá E, Čurdová A, Micenková L, Plíhal O, Šmajs D, Spíchal L, Hejátko J. Identification of AHK2- and AHK3-like cytokinin receptors in Brassica napus reveals two subfamilies of AHK2 orthologues. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:339-53. [PMID: 25336686 DOI: 10.1093/jxb/eru422] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Cytokinin (CK) signalling is known to play key roles in the regulation of plant growth and development, crop yields, and tolerance to both abiotic stress and pathogen defences, but the mechanisms involved are poorly characterized in dicotyledonous crops. Here the identification and functional characterization of sensor histidine kinases homologous to Arabidopsis CK receptors AHK2 and AHK3 in winter oilseed rape are presented. Five CHASE-containing His kinases were identified in Brassica napus var. Tapidor (BnCHK1-BnCHK5) by heterologous hybridization of its genomic library with gene-specific probes from Arabidopsis. The identified bacterial artificial chromosome (BAC) clones were fingerprinted and representative clones in five distinct groups were sequenced. Using a bioinformatic approach and cDNA cloning, the precise gene and putative protein domain structures were determined. Based on phylogenetic analysis, four AHK2 (BnCHK1-BnCHK4) homologues and one AHK3 (BnCHK5) homologue were defined. It is further suggested that BnCHK1 and BnCHK3, and BnCHK5 are orthologues of AHK2 and AHK3, originally from the B. rapa A genome, respectively. BnCHK1, BnCHK3, and BnCHK5 displayed high affinity for trans-zeatin (1-3nM) in a live-cell competitive receptor assay, but not with other plant hormones (indole acetic acid, GA3, and abscisic acid), confirming the prediction that they are genuine CK receptors. It is shown that BnCHK1 and BnCHK3, and BnCHK5 display distinct preferences for various CK bases and metabolites, characteristic of their AHK counterparts, AHK2 and AHK3, respectively. Interestingly, the AHK2 homologues could be divided into two subfamilies (BnCHK1/BnCK2 and BnCHK3/BnCHK4) that differ in putative transmembrane domain topology and CK binding specificity, thus implying potential functional divergence.
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Affiliation(s)
- Alena Kuderová
- Functional Genomics and Proteomics of Plants, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Lucia Gallová
- Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - Katarína Kuricová
- Functional Genomics and Proteomics of Plants, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Eliška Nejedlá
- Functional Genomics and Proteomics of Plants, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Anna Čurdová
- Functional Genomics and Proteomics of Plants, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Lenka Micenková
- Faculty of Medicine, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Ondřej Plíhal
- Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - David Šmajs
- Faculty of Medicine, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Lukáš Spíchal
- Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
| | - Jan Hejátko
- Functional Genomics and Proteomics of Plants, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
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29
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Gruhn N, Halawa M, Snel B, Seidl MF, Heyl A. A subfamily of putative cytokinin receptors is revealed by an analysis of the evolution of the two-component signaling system of plants. PLANT PHYSIOLOGY 2014; 165:227-37. [PMID: 24520157 PMCID: PMC4012582 DOI: 10.1104/pp.113.228080] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 02/07/2014] [Indexed: 05/05/2023]
Abstract
The two-component signaling system--the major signaling pathway of bacteria--is found among higher eukaryotes only in plants, where it regulates diverse processes, such as the signaling of the phytohormone cytokinin. Cytokinin is perceived by a hybrid histidine (His) kinase receptor, and the signal is transduced by a multistep phosphorelay system of His phosphotransfer proteins and different classes of response regulators (RRs). To shed light on the origin and evolution of the two-component signaling system members in plants, we conducted a comprehensive domain-based phylogenetic study across the relevant kingdoms, including Charophyceae algae, the group of green algae giving rise to land plants. Surprisingly, we identified a subfamily of cytokinin receptors with members only from the early diverging land plants Marchantia polymorpha and Physcomitrella patens and then experimentally characterized two members of this subfamily. His phosphotransfer proteins of Charophyceae seemed to be more closely related to land plants than to other groups of green algae. Farther down the signaling pathway, the type-B RRs were found across all plant clades, but many members lack either the canonical Asp residue or the DNA binding domain. In contrast, the type-A RRs seemed to be limited to land plants. Finally, the analysis provided hints that one additional group of RRs, the type-C RRs, might be degenerated receptors and thus, of a different evolutionary origin than bona fide RRs.
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Affiliation(s)
- Nijuscha Gruhn
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences, Freie Universität, 14195 Berlin, Germany (N.G., M.H., A.H.)
- Theoretical Biology and Bioinformatics, Department of Biology, Utrecht University, 3584 CH, Utrecht, The Netherlands (B.S., M.F.S.); and
- Centre for BioSystems Genomics, 6700 AB, Wageningen, The Netherlands (B.S., M.F.S.)
| | - Mhyeddeen Halawa
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences, Freie Universität, 14195 Berlin, Germany (N.G., M.H., A.H.)
- Theoretical Biology and Bioinformatics, Department of Biology, Utrecht University, 3584 CH, Utrecht, The Netherlands (B.S., M.F.S.); and
- Centre for BioSystems Genomics, 6700 AB, Wageningen, The Netherlands (B.S., M.F.S.)
| | - Berend Snel
- Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences, Freie Universität, 14195 Berlin, Germany (N.G., M.H., A.H.)
- Theoretical Biology and Bioinformatics, Department of Biology, Utrecht University, 3584 CH, Utrecht, The Netherlands (B.S., M.F.S.); and
- Centre for BioSystems Genomics, 6700 AB, Wageningen, The Netherlands (B.S., M.F.S.)
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30
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Genomic analysis of cyclic-di-GMP-related genes in rhizobial type strains and functional analysis in Rhizobium etli. Appl Microbiol Biotechnol 2014; 98:4589-602. [PMID: 24728599 DOI: 10.1007/s00253-014-5722-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 03/04/2014] [Accepted: 03/22/2014] [Indexed: 12/28/2022]
Abstract
Rhizobia are soil bacteria that can fix nitrogen in symbiosis with leguminous plants or exist free living in the rhizosphere. Crucial to their complex lifestyle is the ability to sense and respond to diverse environmental stimuli, requiring elaborate signaling pathways. In the majority of bacteria, the nucleotide-based second messenger cyclic diguanosine monophosphate (c-di-GMP) is involved in signal transduction. Surprisingly, little is known about the importance of c-di-GMP signaling in rhizobia. We have analyzed the genome sequences of six well-studied type species (Bradyrhizobium japonicum, Mesorhizobium loti, Rhizobium etli, Rhizobium leguminosarum, Sinorhizobium fredii, and Sinorhizobium meliloti) for proteins possibly involved in c-di-GMP signaling based on the presence of four domains: GGDEF (diguanylate cyclase), EAL and HD-GYP (phosphodiesterase), and PilZ (c-di-GMP sensor). We find that rhizobia possess a high number of these proteins. Conservation analysis suggests that c-di-GMP signaling proteins modulate species-specific pathways rather than ancient rhizobia-specific processes. Two hybrid GGDEF-EAL proteins were selected for functional analysis, R. etli RHE_PD00105 (CdgA) and RHE_PD00137 (CdgB). Expression of cdgA and cdgB is repressed by the alarmone (p)ppGpp. cdgB is significantly expressed on plant roots and free living. Mutation of cdgA, cdgB, or both does not affect plant root colonization, nitrogen fixation capacity, biofilm formation, motility, and exopolysaccharide production. However, heterologous expression of the individual GGDEF and EAL domains of each protein in Escherichia coli strongly suggests that CdgA and CdgB are bifunctional proteins, possessing both diguanylate cyclase and phosphodiesterase activities. Taken together, our results provide a platform for future studies of c-di-GMP signaling in rhizobia.
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Strasser R. Biological significance of complex N-glycans in plants and their impact on plant physiology. FRONTIERS IN PLANT SCIENCE 2014; 5:363. [PMID: 25101107 PMCID: PMC4105690 DOI: 10.3389/fpls.2014.00363] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 07/08/2014] [Indexed: 05/18/2023]
Abstract
Asparagine (N)-linked protein glycosylation is a ubiquitous co- and post-translational modification which can alter the biological function of proteins and consequently affects the development, growth, and physiology of organisms. Despite an increasing knowledge of N-glycan biosynthesis and processing, we still understand very little about the biological function of individual N-glycan structures in plants. In particular, the N-glycan-processing steps mediated by Golgi-resident enzymes create a structurally diverse set of protein-linked carbohydrate structures. Some of these complex N-glycan modifications like the presence of β1,2-xylose, core α1,3-fucose or the Lewis a-epitope are characteristic for plants and are evolutionary highly conserved. In mammals, complex N-glycans are involved in different cellular processes including molecular recognition and signaling events. In contrast, the complex N-glycan function is still largely unknown in plants. Here, in this short review, I focus on important recent developments and discuss their implications for future research in plant glycobiology and plant biotechnology.
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Affiliation(s)
- Richard Strasser
- *Correspondence: Richard Strasser, Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria e-mail:
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