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Strini EJ, Bertolino LT, San Martin JAB, Souza HAO, Pessotti F, Pinoti VF, Ferreira PB, De Paoli HC, Lubini G, Del-Bem LE, Quiapim AC, Mondin M, Araujo APU, Eloy NB, Barberis M, Goldman MHS. Stigma/Style Cell-Cycle Inhibitor 1, a Regulator of Cell Proliferation, Interacts With a Specific 14-3-3 Protein and Is Degraded During Cell Division. FRONTIERS IN PLANT SCIENCE 2022; 13:857745. [PMID: 35444668 PMCID: PMC9013909 DOI: 10.3389/fpls.2022.857745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 03/14/2022] [Indexed: 06/14/2023]
Abstract
The final shape and size of plant organs are determined by a network of genes that modulate cell proliferation and expansion. Among those, SCI1 (Stigma/style Cell-cycle Inhibitor 1) functions by inhibiting cell proliferation during pistil development. Alterations in SCI1 expression levels can lead to remarkable stigma/style size changes. Recently, we demonstrated that SCI1 starts to be expressed at the specification of the Nicotiana tabacum floral meristem and is expressed at all floral meristematic cells. To elucidate how SCI1 regulates cell proliferation, we screened a stigma/style cDNA library through the yeast two-hybrid (Y2H) system, using SCI1 as bait. Among the interaction partners, we identified the 14-3-3D protein of the Non-Epsilon group. The interaction between SCI1 and 14-3-3D was confirmed by pulldown and co-immunoprecipitation experiments. 14-3-3D forms homo- and heterodimers in the cytoplasm of plant cells and interacts with SCI1 in the nucleus, as demonstrated by Bimolecular Fluorescence Complementation (BiFC). Analyses of SCI1-GFP fluorescence through the cell-cycle progression revealed its presence in the nucleoli during interphase and prophase. At metaphase, SCI1-GFP fluorescence faded and was no longer detected at anaphase, reappearing at telophase. Upon treatment with the 26S proteasome inhibitor MG132, SCI1-GFP was stabilized during cell division. Site-directed mutagenesis of seven serines into alanines in the predicted 14-3-3 binding sites on the SCI1 sequence prevented its degradation during mitosis. Our results demonstrate that SCI1 degradation at the beginning of metaphase is dependent on the phosphorylation of serine residues and on the action of the 26S proteasome. We concluded that SCI1 stability/degradation is cell-cycle regulated, consistent with its role in fine-tuning cell proliferation.
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Affiliation(s)
- Edward J. Strini
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
- PPG-Genética, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Lígia T. Bertolino
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
- PPG-Genética, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Juca A. B. San Martin
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Hebréia A. O. Souza
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Francine Pessotti
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
- PPG-Genética, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Vitor F. Pinoti
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
- PPG-Genética, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Pedro B. Ferreira
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
- PPG-Genética, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Henrique C. De Paoli
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
- PPG-Genética, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Greice Lubini
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
- PPG-Genética, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Luiz-Eduardo Del-Bem
- Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Andréa C. Quiapim
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Mateus Mondin
- Departamento de Genética, Escola Superior de Agricultura Luiz de Queiroz, University of São Paulo, Piracicaba, Brazil
| | - Ana Paula U. Araujo
- São Carlos Institute of Physics, University of São Paulo, São Carlos, Brazil
| | - Nubia B. Eloy
- Departamento de Ciências Biológicas, Escola Superior de Agricultura Luiz de Queiroz, University of São Paulo, Piracicaba, Brazil
| | - Matteo Barberis
- Systems Biology, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom
- Centre for Mathematical and Computational Biology, CMCB, University of Surrey, Guildford, United Kingdom
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Maria Helena S. Goldman
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
- PPG-Genética, Faculdade de Medicina de Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
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Hloušková P, Černý M, Kořínková N, Luklová M, Minguet EG, Brzobohatý B, Galuszka P, Bergougnoux V. Affinity chromatography revealed 14-3-3 interactome of tomato (Solanum lycopersicum L.) during blue light-induced de-etiolation. J Proteomics 2018; 193:44-61. [PMID: 30583044 DOI: 10.1016/j.jprot.2018.12.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 12/09/2018] [Accepted: 12/14/2018] [Indexed: 10/27/2022]
Abstract
De-etiolation is the first developmental process under light control allowing the heterotrophic seedling to become autotrophic. The phytohormones cytokinins (CKs) largely contribute to this process. Reversible phosphorylation is a key event of cell signaling, allowing proteins to become active or generating a binding site for specific protein interaction. 14-3-3 proteins regulate a variety of plant responses. The expression, hormonal regulation, and proteomic network under the control of 14-3-3s were addressed in tomato (Solanum lycopersicum L.) during blue light-induced photomorphogenesis. Two isoforms were specifically investigated due to their high expression during tomato de-etiolation. The multidisciplinary approach demonstrated that TFT9 expression, but not TFT6, was regulated by CKs and identified cis-regulating elements required for this response. Our study revealed >130 potential TFT6/9 interactors. Their functional annotation predicted that TFTs might regulate the activity of proteins involved notably in cell wall strengthening or primary metabolism. Several potential interactors were also predicted to be CK-responsive. For the first time, the 14-3-3 interactome linked to de-etiolation was investigated and evidenced that 14-3-3s might be involved in CK signaling pathway, cell expansion inhibition and steady-state growth rate establishment, and reprograming from heterotrophy to autotrophy. BIOLOGICAL SIGNIFICANCE: Tomato (Solanum lycopersicum L.) is one of the most important vegetables consumed all around the world and represents probably the most preferred garden crop. Regulation of hypocotyl growth by light plays an important role in the early development of a seedling, and consequently the homogeneity of the culture. The present study focuses on the importance of tomato 14-3-3/TFT proteins in this process. We provide here the first report of 14-3-3 interactome in the regulation of light-induced de-etiolation and subsequent photomorphogenesis. Our data provide new insights into light-induced de-etiolation and open new horizons for dissecting the post-transcriptional regulations.
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Affiliation(s)
- Petra Hloušková
- Department of Molecular Biology, Centre of the Region Hana for Biotechnological and Agricultural Research, Palacky University in Olomouc, Šlechtitelu 27, 783 71 Olomouc, Czechia
| | - Martin Černý
- Laboratory of Plant Molecular Biology, Institute of Biophysics AS CR and CEITEC-Central European Institute of Technology, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czechia
| | - Nikola Kořínková
- Department of Molecular Biology, Centre of the Region Hana for Biotechnological and Agricultural Research, Palacky University in Olomouc, Šlechtitelu 27, 783 71 Olomouc, Czechia
| | - Markéta Luklová
- Laboratory of Plant Molecular Biology, Institute of Biophysics AS CR and CEITEC-Central European Institute of Technology, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czechia
| | - Eugenio Gómez Minguet
- Instituto de Biología Molecular y Celular de Plantas (UPV-Consejo Superior de Investigaciones Científicas), Universidad Politécnica de Valencia, 46022, Valencia, Spain
| | - Břetislav Brzobohatý
- Laboratory of Plant Molecular Biology, Institute of Biophysics AS CR and CEITEC-Central European Institute of Technology, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czechia
| | - Petr Galuszka
- Department of Molecular Biology, Centre of the Region Hana for Biotechnological and Agricultural Research, Palacky University in Olomouc, Šlechtitelu 27, 783 71 Olomouc, Czechia
| | - Véronique Bergougnoux
- Department of Molecular Biology, Centre of the Region Hana for Biotechnological and Agricultural Research, Palacky University in Olomouc, Šlechtitelu 27, 783 71 Olomouc, Czechia.
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Li B, Xiao G, Luo K, Wang Z, Mao B, Lin X, Guo X. Overexpression of PvGF14c from Phyllostachys violascens Delays Flowering Time in Transgenic Arabidopsis. FRONTIERS IN PLANT SCIENCE 2018; 9:105. [PMID: 29491870 PMCID: PMC5817094 DOI: 10.3389/fpls.2018.00105] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Accepted: 01/19/2018] [Indexed: 05/19/2023]
Abstract
14-3-3 Proteins are a family of highly conserved regulatory molecules expressed in all eukaryotic cells and regulate a diverse set of biological responses in plants. However, their functions in flowering of Phyllostachys violascens are poorly understood. In this study, four non-𝜀 Pv14-3-3 genes from P. violascens were identified and named PvGF14b, PvGF14c, PvGF14e, and PvGF14f. qRT-PCR analyses revealed that PvGF14b and PvGF14e exhibited widely expressed in all tested bamboo tissues. PvGF14b was highest expression in root and lowest in immature leaf. Whereas PvGF14c and PvGF14f showed tissue-specific expression. PvGF14c was mainly expressed in immature and mature leaves. PvGF14f was highest expression in mature leaves. These four genes were not significantly differentially expressed in mature leaf before bamboo flowering and during flower development. PvGF14b and PvGF14c were not induced by circadian rhythm. PvGF14c displayed subcellular localization in the cytoplasm and PvFT in nucleus and cytoplasm. Yeast two-hybrid screening and bimolecular fluorescence complementation confirmed the interaction between PvGF14c and PvFT. The overexpression of PvGF14b, PvGF14c, and PvGF14e significantly delayed flowering time in transgenic Arabidopsis under long-day condition. These findings suggested that at least three PvGF14 genes are involved in flowering and may act as a negative regulator of flowering by interacting with PvFT in bamboo.
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Affiliation(s)
- Bingjuan Li
- The State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou, China
| | - Guohui Xiao
- The State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou, China
| | - Kaisheng Luo
- School of Geography and Remote Sensing, Nanjing University of Information Science and Technology, Nanjing, China
| | - Zhengyi Wang
- Institute of Biotechnology, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Bizeng Mao
- Institute of Biotechnology, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, China
| | - Xinchun Lin
- The State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou, China
| | - Xiaoqin Guo
- The State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou, China
- Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-efficiency Utilization, Zhejiang A & F University, Hangzhou, China
- *Correspondence: Xiaoqin Guo,
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Ermert AL, Mailliet K, Hughes J. Holophytochrome-Interacting Proteins in Physcomitrella: Putative Actors in Phytochrome Cytoplasmic Signaling. FRONTIERS IN PLANT SCIENCE 2016; 7:613. [PMID: 27242820 PMCID: PMC4867686 DOI: 10.3389/fpls.2016.00613] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2016] [Accepted: 04/21/2016] [Indexed: 05/26/2023]
Abstract
Phytochromes are the principle photoreceptors in light-regulated plant development, primarily acting via translocation of the light-activated photoreceptor into the nucleus and subsequent gene regulation. However, several independent lines of evidence indicate unambiguously that an additional cytoplasmic signaling mechanism must exist. Directional responses in filament tip cells of the moss Physcomitrella patens are steered by phy4 which has been shown to interact physically with the blue light receptor phototropin at the plasma membrane. This complex might perceive and transduce vectorial information leading to cytoskeleton reorganization and finally a directional growth response. We developed yeast two-hybrid procedures using photochemically functional, full-length phy4 as bait in Physcomitrella cDNA library screens and growth assays under different light conditions, revealing Pfr-dependent interactions possibly associated with phytochrome cytoplasmic signaling. Candidate proteins were then expressed in planta with fluorescent protein tags to determine their intracellular localization in darkness and red light. Of 14 candidates, 12 were confirmed to interact with phy4 in planta using bimolecular fluorescence complementation. We also used database information to study their expression patterns relative to those of phy4. We discuss the likely functional characteristics of these holophytochrome-interacting proteins (HIP's) and their possible roles in signaling.
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Yoon GM. New Insights into the Protein Turnover Regulation in Ethylene Biosynthesis. Mol Cells 2015; 38:597-603. [PMID: 26095506 PMCID: PMC4507024 DOI: 10.14348/molcells.2015.0152] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Accepted: 06/08/2015] [Indexed: 11/30/2022] Open
Abstract
Biosynthesis of the phytohormone ethylene is under tight regulation to satisfy the need for appropriate levels of ethylene in plants in response to exogenous and endogenous stimuli. The enzyme 1-aminocyclopropane-1-carboxylic acid synthase (ACS), which catalyzes the rate-limiting step of ethylene biosynthesis, plays a central role to regulate ethylene production through changes in ACS gene expression levels and the activity of the enzyme. Together with molecular genetic studies suggesting the roles of post-translational modification of the ACS, newly emerging evidence strongly suggests that the regulation of ACS protein stability is an alternative mechanism that controls ethylene production, in addition to the transcriptional regulation of ACS genes. In this review, recent new insight into the regulation of ACS protein turnover is highlighted, with a special focus on the roles of phosphorylation, ubiquitination, and novel components that regulate the turnover of ACS proteins. The prospect of cross-talk between ethylene biosynthesis and other signaling pathways to control turnover of the ACS protein is also considered.
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Affiliation(s)
- Gyeong Mee Yoon
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana 47907,
USA
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Li X, Dhaubhadel S. Soybean 14-3-3 gene family: identification and molecular characterization. PLANTA 2011; 233:569-82. [PMID: 21120521 DOI: 10.1007/s00425-010-1315-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Accepted: 11/03/2010] [Indexed: 05/08/2023]
Abstract
The 14-3-3s are a group of proteins that are ubiquitously found in eukaryotes. Plant 14-3-3 proteins are encoded by a large multigene family and are involved in signaling pathways to regulate plant development and protection from stress. Recent studies in Arabidopsis and rice have demonstrated the isoform specificity in 14-3-3s and their client protein interactions. However, detailed characterization of 14-3-3 gene family in legumes has not been reported. In this study, soybean 14-3-3 proteins were identified and their molecular characterization performed. Data mining of soybean genome and expressed sequence tag databases identified 18 14-3-3 genes, of them 16 are transcribed. All 16 SGF14s have higher expression in embryo tissues suggesting their potential role in seed development. Subcellular localization of all transcribed SGF14s demonstrated that 14-3-3 proteins in soybean have isoform specificity, however, some overlaps were also observed between closely related isoforms. A comparative analysis of SGF14s with Arabidopsis and rice 14-3-3s indicated that SGF14s also group into epsilon and non-epsilon classes. However, unlike Arabidopsis and rice 14-3-3s, SGF14s contained only one kind of gene structure belonging to each class. Overall, soybean consists of the largest family of 14-3-3 proteins characterized to date. Our results provide a solid framework for further investigations into the role of SGF14s and their involvement in legume-specific functions.
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Affiliation(s)
- Xuyan Li
- Southern Crop Protection and Food Research Center, Agriculture and Agri-Food Canada, 1391 Sandford Street, London, ON, N5V 4T3, Canada
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