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Narra M, Kota S, Velivela Y, Ellendula R, Allini VR, Abbagani S. Construction of chloroplast transformation vector and its functional evaluation in Momordica charantia L. 3 Biotech 2018; 8:140. [PMID: 29484279 PMCID: PMC5817051 DOI: 10.1007/s13205-018-1160-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2017] [Accepted: 02/06/2018] [Indexed: 12/20/2022] Open
Abstract
Chloroplast transformation vectors require an expression cassette flanked by homologous plastid sequences to drive plastome recombination. The rrn16-rrn23 plastome region was selected and using this region, a new species-specific plastid transformation vector CuIA was developed with pKS+II as a backbone by inserting the rrn16-trnI and trnA-rrn23 sequences from Cucumis sativus L. An independent expression cassette with aadA gene encoding aminoglycoside 3'-adenylyltransferase with psbA controlling elements is added into the trnI-trnA intergenic region that confers resistance to spectinomycin. An efficient plastid transformation in bitter melon (Momordica charantia L.) was achieved by bombardment of petiole segments. The frequency of transplastomic plants yielded using standardized biolistic parameters with CuIA vector was two per 15 bombarded plates, each containing 20 petiole explants. Integration of aadA gene was verified by PCR analysis in transplastomes. Transplastomic technology developed may be a novel approach for high level expression of pharmaceutical traits.
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Affiliation(s)
| | - Srinivas Kota
- Department of Biotechnology, Kakatiya University, Warangal, 506009 India
| | | | - Raghu Ellendula
- Department of Biotechnology, Kakatiya University, Warangal, 506009 India
| | - V. Rao Allini
- Department of Biotechnology, Kakatiya University, Warangal, 506009 India
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Non-photosynthetic plastids as hosts for metabolic engineering. Essays Biochem 2018; 62:41-50. [DOI: 10.1042/ebc20170047] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 01/13/2018] [Accepted: 01/22/2018] [Indexed: 01/11/2023]
Abstract
Using plants as hosts for production of complex, high-value compounds and therapeutic proteins has gained increasing momentum over the past decade. Recent advances in metabolic engineering techniques using synthetic biology have set the stage for production yields to become economically attractive, but more refined design strategies are required to increase product yields without compromising development and growth of the host system. The ability of plant cells to differentiate into various tissues in combination with a high level of cellular compartmentalization represents so far the most unexploited plant-specific resource. Plant cells contain organelles called plastids that retain their own genome, harbour unique biosynthetic pathways and differentiate into distinct plastid types upon environmental and developmental cues. Chloroplasts, the plastid type hosting the photosynthetic processes in green tissues, have proven to be suitable for high yield protein and bio-compound production. Unfortunately, chloroplast manipulation often affects photosynthetic efficiency and therefore plant fitness. In this respect, plastids of non-photosynthetic tissues, which have focused metabolisms for synthesis and storage of particular classes of compounds, might prove more suitable for engineering the production and storage of non-native metabolites without affecting plant fitness. This review provides the current state of knowledge on the molecular mechanisms involved in plastid differentiation and focuses on non-photosynthetic plastids as alternative biotechnological platforms for metabolic engineering.
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Rosales-Mendoza S, Monreal-Escalante E, González-Ortega O, Hernández M, Fragoso G, Garate T, Sciutto E. Transplastomic plants yield a multicomponent vaccine against cysticercosis. J Biotechnol 2018; 266:124-132. [PMID: 29253519 DOI: 10.1016/j.jbiotec.2017.12.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Revised: 12/12/2017] [Accepted: 12/14/2017] [Indexed: 11/30/2022]
Abstract
Low cost vaccines against cysticercosis are needed to fight this parasitosis, especially in developing countries. Herein polycistron arrangements were designed to accomplish the simultaneous expression of multiple protective antigens from Taenia solium in the plant cell as an attractive biofactory and delivery vehicle of vaccines. Transplastomic plants carrying synthetic polycistrons were able to simultaneously express the KETc1, KETc7, KETc12, GK1, and TSOL18/HP6-Tsol antigens; which retained their antigenicity and ability to induce humoral responses in BALB/c mice. These clones may be useful for the production of low-cost cysticercosis vaccine prototypes.
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Affiliation(s)
- Sergio Rosales-Mendoza
- Laboratorio de Biofarmacéuticos Recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, 78210, SLP. San Luis Potosí. México.
| | - Elizabeth Monreal-Escalante
- Laboratorio de Biofarmacéuticos Recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, 78210, SLP. San Luis Potosí. México
| | - Omar González-Ortega
- Laboratorio de Bioseparaciones, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, 78210, SLP. San Luis Potosí, México
| | - Marisela Hernández
- Dpto. Inmunología. Instituto De Investigaciones Biomédicas, Universidad Nacional Autónoma De México. Circuito Escolar. Ciudad Universitaria, C.p. 04510. Ciudad De México, México
| | - Gladis Fragoso
- Dpto. Inmunología. Instituto De Investigaciones Biomédicas, Universidad Nacional Autónoma De México. Circuito Escolar. Ciudad Universitaria, C.p. 04510. Ciudad De México, México
| | - Teresa Garate
- Dpto. De Parasitología, Centro Nacional De Microbiología, Instituto De Salud Carlos Iii, Majadahonda, 28220, Madrid, Spain
| | - Edda Sciutto
- Dpto. Inmunología. Instituto De Investigaciones Biomédicas, Universidad Nacional Autónoma De México. Circuito Escolar. Ciudad Universitaria, C.p. 04510. Ciudad De México, México.
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54
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El Hajj M, Hamdan MFB, Avila EM, Day A. Rescue of Deletion Mutants to Isolate Plastid Transformants in Higher Plants. Methods Mol Biol 2018; 1829:325-339. [PMID: 29987732 DOI: 10.1007/978-1-4939-8654-5_22] [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] [Indexed: 12/17/2023]
Abstract
Plastid transformation is an attractive alternative to nuclear transformation enabling manipulation of native plastid genes and the insertion of foreign genes into plastids for applications in agriculture and industrial biotechnology. Transformation is achieved using dominant positive selection markers that confer resistance to antibiotics. The very high copy number of plastid DNA means that a prolonged selection step is required to obtain a uniform population of transgenic plastid genomes. Repair of mutant plastid genes with the corresponding functional allele allows selection based on restoration of the wild type phenotype. The use of deletion rather than point mutants avoids spontaneous reversion back to wild type. Combining antibiotic resistance markers with native plastid genes speeds up the attainment of homoplasmy and allows early transfer of transplastomic lines to soil where antibiotic selection is replaced by selection for photoautotrophic growth. Here we describe our method using the wild type rbcL gene as a plastid transformation marker to restore pigmentation and photosynthesis to a pale green heterotrophic rbcL mutant.
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Affiliation(s)
- Mohammad El Hajj
- School of Biological Sciences, The University of Manchester, Manchester, UK
| | | | - Elena Martin Avila
- School of Biological Sciences, The University of Manchester, Manchester, UK
| | - Anil Day
- School of Biological Sciences, The University of Manchester, Manchester, UK.
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55
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Qu Y, Legen J, Arndt J, Henkel S, Hoppe G, Thieme C, Ranzini G, Muino JM, Weihe A, Ohler U, Weber G, Ostersetzer O, Schmitz-Linneweber C. Ectopic Transplastomic Expression of a Synthetic MatK Gene Leads to Cotyledon-Specific Leaf Variegation. FRONTIERS IN PLANT SCIENCE 2018; 9:1453. [PMID: 30337934 PMCID: PMC6180158 DOI: 10.3389/fpls.2018.01453] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 09/12/2018] [Indexed: 05/20/2023]
Abstract
Chloroplasts (and other plastids) harbor their own genetic material, with a bacterial-like gene-expression systems. Chloroplast RNA metabolism is complex and is predominantly mediated by nuclear-encoded RNA-binding proteins. In addition to these nuclear factors, the chloroplast-encoded intron maturase MatK has been suggested to perform as a splicing factor for a subset of chloroplast introns. MatK is essential for plant cell survival in tobacco, and thus null mutants have not yet been isolated. We therefore attempted to over-express MatK from a neutral site in the chloroplast, placing it under the control of a theophylline-inducible riboswitch. This ectopic insertion of MatK lead to a variegated cotyledons phenotype. The addition of the inducer theophylline exacerbated the phenotype in a concentration-dependent manner. The extent of variegation was further modulated by light, sucrose and spectinomycin, suggesting that the function of MatK is intertwined with photosynthesis and plastid translation. Inhibiting translation in the transplastomic lines has a profound effect on the accumulation of several chloroplast mRNAs, including the accumulation of an RNA antisense to rpl33, a gene coding for an essential chloroplast ribosomal protein. Our study further supports the idea that MatK expression needs to be tightly regulated to prevent detrimental effects and establishes another link between leaf variegation and chloroplast translation.
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Affiliation(s)
- Yujiao Qu
- Institut für Biologie, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Julia Legen
- Institut für Biologie, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Jürgen Arndt
- Institut für Biologie, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Stephanie Henkel
- Institut für Biologie, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Galina Hoppe
- Institut für Biologie, Humboldt-Universität zu Berlin, Berlin, Germany
| | | | - Giovanna Ranzini
- Institut für Biologie, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Jose M. Muino
- Institut für Biologie, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Andreas Weihe
- Institut für Biologie, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Uwe Ohler
- Computational Regulatory Genomics, Berlin Institute for Medical Systems Biology, Max Delbrück Center for Molecular Medicine, Berlin, Germany
| | - Gert Weber
- Institut für Biologie, Humboldt-Universität zu Berlin, Berlin, Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie, Joint Research Group Macromolecular Crystallography, Berlin, Germany
| | - Oren Ostersetzer
- Department of Plant and Environmental Sciences, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Christian Schmitz-Linneweber
- Institut für Biologie, Humboldt-Universität zu Berlin, Berlin, Germany
- *Correspondence: Christian Schmitz-Linneweber,
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56
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Horn P, Nausch H, Baars S, Schmidtke J, Schmidt K, Schneider A, Leister D, Broer I. Paternal inheritance of plastid-encoded transgenes in Petunia hybrida in the greenhouse and under field conditions. BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2017; 16:26-31. [PMID: 29159138 PMCID: PMC5684430 DOI: 10.1016/j.btre.2017.11.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 10/20/2017] [Accepted: 11/01/2017] [Indexed: 01/23/2023]
Abstract
As already demonstrated in greenhouse trials, outcrossing of transgenic plants can be drastically reduced via transgene integration into the plastid. We verified this result in the field with Petunia, for which the highest paternal leakage has been observed. The variety white 115 (W115) served as recipient and Pink Wave (PW) and the transplastomic variant PW T16, encoding the uidA reporter gene, as pollen donor. While manual pollination in the greenhouse led to over 90% hybrids for both crossings, the transgenic donor resulted only in 2% hybrids in the field. Nevertheless paternal leakage was detected in one case which proves that paternal inheritance of plastid-located transgenes is possible under artificial conditions. In the greenhouse, paternal leakage occurred in a frequency comparable to published results. As expected natural pollination reduced the hybrid formation in the field from 90 to 7.6% and the transgenic donor did not result in any hybrid.
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Affiliation(s)
- Patricia Horn
- University of Rostock, Faculty of Agricultural and Environmental Sciences, Department of Agrobiotechnology and Risk Assessment for Bio- und Gene Technology, Justus-von-Liebig Weg 8, 18059 Rostock, Germany
| | - Henrik Nausch
- University of Rostock, Faculty of Agricultural and Environmental Sciences, Department of Agrobiotechnology and Risk Assessment for Bio- und Gene Technology, Justus-von-Liebig Weg 8, 18059 Rostock, Germany
| | - Susanne Baars
- University of Rostock, Faculty of Agricultural and Environmental Sciences, Department of Agrobiotechnology and Risk Assessment for Bio- und Gene Technology, Justus-von-Liebig Weg 8, 18059 Rostock, Germany
| | - Jörg Schmidtke
- BioMath GmbH, Friedrich-Barnewitz-Str. 8, 18119, Rostock-Warnemünde, Germany
| | - Kerstin Schmidt
- BioMath GmbH, Friedrich-Barnewitz-Str. 8, 18119, Rostock-Warnemünde, Germany
| | - Anja Schneider
- Ludwig-Maximilians-University Munich (LMU), Faculty of Biology, Chair of Plant Molecular Biology (Botany), Großhaderner Str. 2, 82152 Planegg-Martinsried, Germany
| | - Dario Leister
- Ludwig-Maximilians-University Munich (LMU), Faculty of Biology, Chair of Plant Molecular Biology (Botany), Großhaderner Str. 2, 82152 Planegg-Martinsried, Germany
| | - Inge Broer
- University of Rostock, Faculty of Agricultural and Environmental Sciences, Department of Agrobiotechnology and Risk Assessment for Bio- und Gene Technology, Justus-von-Liebig Weg 8, 18059 Rostock, Germany
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57
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Shao M, Blechl A, Thomson JG. Small serine recombination systems ParA-MRS and CinH-RS2 perform precise excision of plastid DNA. PLANT BIOTECHNOLOGY JOURNAL 2017; 15:1577-1589. [PMID: 28421718 PMCID: PMC5698047 DOI: 10.1111/pbi.12740] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 03/23/2017] [Accepted: 03/24/2017] [Indexed: 06/07/2023]
Abstract
Selectable marker genes (SMGs) are necessary for selection of transgenic plants. However, once stable transformants have been identified, the marker gene is no longer needed. In this study, we demonstrate the use of the small serine recombination systems, ParA-MRS and CinH-RS2, to precisely excise a marker gene from the plastid genome of tobacco. Transplastomic plants transformed with the pTCH-MRS and pTCH-RS2 vectors, containing the visual reporter gene DsRed flanked by directly oriented MRS and RS2 recognition sites, respectively, were crossed with nuclear-genome transformed tobacco plants expressing plastid-targeted ParA and CinH recombinases, respectively. One hundred per cent of both types of F1 hybrids exhibited excision of the DsRed marker gene. PCR and Southern blot analyses of DNA from F2 plants showed that approximately 30% (CinH-RS2) or 40% (ParA-MRS) had lost the recombinase genes by segregation. The postexcision transformed plastid genomes were stable and the excision events heritable. The ParA-MRS and CinH-RS2 recombination systems will be useful tools for site-specific manipulation of the plastid genome and for generating marker-free plants, an essential step for reuse of SMG and for addressing concerns about the presence of antibiotic resistance genes in transgenic plants.
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Affiliation(s)
- Min Shao
- UC Davis Department of Plant SciencesDavisCAUSA
| | - Ann Blechl
- USDA‐WRRC‐ARS Crop Improvement and Genetics Research UnitAlbanyCAUSA
| | - James G. Thomson
- USDA‐WRRC‐ARS Crop Improvement and Genetics Research UnitAlbanyCAUSA
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58
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Gene editing in tomatoes. Emerg Top Life Sci 2017; 1:183-191. [DOI: 10.1042/etls20170056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 10/13/2017] [Accepted: 10/16/2017] [Indexed: 11/17/2022]
Abstract
Tomato is an effective model plant species because it possesses the qualities necessary for genetic and functional studies, but is also a food crop making what is learned more translatable for crop improvement when compared with other non-food crop models. The availability of genome sequences for many genotypes and amenability to transformation methodologies (Agrobacterium-mediated, direct DNA uptake via protoplasts, biolistics) make tomato the perfect platform to study the application of gene-editing technologies. This review includes information related to tomato transformation methodology, one of the necessary requirements for gene editing, along with the status of site-directed mutagenesis by TALENs (transcription activator-like effector nucleases) and CRISPR/Cas (clustered regularly interspaced short palindromic repeats and CRISPR-associated Proteins). In addition to the reports on proof-of-concept experiments to demonstrate the feasibility of gene editing in tomato, there are many reports that show the power of these technologies for modification of traits, such as fruit characteristics (ripening, size, and parthenocarpy), pathogen susceptibility, architecture (plant and inflorescence), and metabolic engineering. Also highlighted in this review are reports on the application of a recent CRISPR technology called base editing that allows the modification of one base pair in a gene sequence and a strategy that takes advantage of a geminivirus replicon for delivery of DNA repair template.
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59
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Lu Y, Stegemann S, Agrawal S, Karcher D, Ruf S, Bock R. Horizontal Transfer of a Synthetic Metabolic Pathway between Plant Species. Curr Biol 2017; 27:3034-3041.e3. [PMID: 28943084 DOI: 10.1016/j.cub.2017.08.044] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Revised: 08/01/2017] [Accepted: 08/18/2017] [Indexed: 12/22/2022]
Abstract
Transgene expression from the plastid (chloroplast) genome provides unique advantages, including high levels of foreign protein accumulation, convenient transgene stacking in operons, and increased biosafety due to exclusion of plastids from pollen transmission [1, 2]. However, applications in biotechnology and synthetic biology are severely restricted by the very small number of plant species whose plastid genomes currently can be transformed [3, 4]. Here we report a simple method for the introduction of useful plastid transgenes into non-transformable species. The transgenes tested comprised a synthetic operon encoding three components of a biosynthetic pathway for producing the high-value ketocarotenoid astaxanthin in the plastids of the cigarette tobacco, Nicotiana tabacum. Transplastomic N. tabacum plants accumulated astaxanthin to up to 1% of the plants' dry weight. We then used grafting, a procedure recently shown to facilitate horizontal genome transfer between plants [5-7], to let the transgenic chloroplast genome move across the graft junction from N. tabacum plants into plants of the nicotine-free tree species Nicotiana glauca. Transplastomic N. glauca trees expressing the synthetic pathway were recovered at high frequency, thus providing a straightforward method for extension of the transplastomic technology to new species.
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Affiliation(s)
- Yinghong Lu
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Sandra Stegemann
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Shreya Agrawal
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Daniel Karcher
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Stephanie Ruf
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany
| | - Ralph Bock
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany.
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60
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Lee JH, Ko K. Production of Recombinant Anti-Cancer Vaccines in Plants. Biomol Ther (Seoul) 2017; 25:345-353. [PMID: 28554196 PMCID: PMC5499611 DOI: 10.4062/biomolther.2016.126] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 12/13/2016] [Accepted: 02/06/2017] [Indexed: 12/24/2022] Open
Abstract
Plant expression systems have been developed to produce anti-cancer vaccines. Plants have several advantages as bioreactors for the production of subunit vaccines: they are considered safe, and may be used to produce recombinant proteins at low production cost. However, several technical issues hinder large-scale production of anti-cancer vaccines in plants. The present review covers design strategies to enhance the immunogenicity and therapeutic potency of anti-cancer vaccines, methods to increase vaccine-expressing plant biomass, and challenges facing the production of anti-cancer vaccines in plants. Specifically, the issues such as low expression levels and plant-specific glycosylation are described, along with their potential solutions.
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Affiliation(s)
- Jeong Hwan Lee
- Department of Medicine, Therapeutic Protein Engineering Lab, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Kisung Ko
- Department of Medicine, Therapeutic Protein Engineering Lab, College of Medicine, Chung-Ang University, Seoul 06974, Republic of Korea
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61
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Tabatabaei I, Ruf S, Bock R. A bifunctional aminoglycoside acetyltransferase/phosphotransferase conferring tobramycin resistance provides an efficient selectable marker for plastid transformation. PLANT MOLECULAR BIOLOGY 2017; 93:269-281. [PMID: 27858324 PMCID: PMC5306187 DOI: 10.1007/s11103-016-0560-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 11/10/2016] [Indexed: 05/22/2023]
Abstract
KEY MESSAGE A new selectable marker gene for stable transformation of the plastid genome was developed that is similarly efficient as the aadA, and produces no background of spontaneous resistance mutants. More than 25 years after its development for Chlamydomonas and tobacco, the transformation of the chloroplast genome still represents a challenging technology that is available only in a handful of species. The vast majority of chloroplast transformation experiments conducted thus far have relied on a single selectable marker gene, the spectinomycin resistance gene aadA. Although a few alternative markers have been reported, the aadA has remained unrivalled in efficiency and is, therefore, nearly exclusively used. The development of new marker genes for plastid transformation is of crucial importance to all efforts towards extending the species range of the technology as well as to those applications in basic research, biotechnology and synthetic biology that involve the multistep engineering of plastid genomes. Here, we have tested a bifunctional resistance gene for its suitability as a selectable marker for chloroplast transformation. The bacterial enzyme aminoglycoside acetyltransferase(6')-Ie/aminoglycoside phosphotransferase(2″)-Ia possesses an N-terminal acetyltransferase domain and a C-terminal phosphotransferase domain that can act synergistically and detoxify aminoglycoside antibiotics highly efficiently. We report that, in combination with selection for resistance to the aminoglycoside tobramycin, the aac(6')-Ie/aph(2″)-Ia gene represents an efficient marker for plastid transformation in that it produces similar numbers of transplastomic lines as the spectinomycin resistance gene aadA. Importantly, no spontaneous antibiotic resistance mutants appear under tobramycin selection.
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Affiliation(s)
- Iman Tabatabaei
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476, Potsdam-Golm, Germany
| | - Stephanie Ruf
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476, Potsdam-Golm, Germany
| | - Ralph Bock
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476, Potsdam-Golm, Germany.
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Ahmad N, Michoux F, Lössl AG, Nixon PJ. Challenges and perspectives in commercializing plastid transformation technology. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:5945-5960. [PMID: 27697788 DOI: 10.1093/jxb/erw360] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Plastid transformation has emerged as an alternative platform to generate transgenic plants. Attractive features of this technology include specific integration of transgenes-either individually or as operons-into the plastid genome through homologous recombination, the potential for high-level protein expression, and transgene containment because of the maternal inheritance of plastids. Several issues associated with nuclear transformation such as gene silencing, variable gene expression due to the Mendelian laws of inheritance, and epigenetic regulation have not been observed in the plastid genome. Plastid transformation has been successfully used for the production of therapeutics, vaccines, antigens, and commercial enzymes, and for engineering various agronomic traits including resistance to biotic and abiotic stresses. However, these demonstrations have usually focused on model systems such as tobacco, and the technology per se has not yet reached the market. Technical factors limiting this technology include the lack of efficient protocols for the transformation of cereals, poor transgene expression in non-green plastids, a limited number of selection markers, and the lengthy procedures required to recover fully segregated plants. This article discusses the technology of transforming the plastid genome, the positive and negative features compared with nuclear transformation, and the current challenges that need to be addressed for successful commercialization.
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Affiliation(s)
- Niaz Ahmad
- Agricultural Biotechnology Division, National Institute for Biotechnology and Genetic Engineering, Jhang Road, Faisalabad, Pakistan
| | - Franck Michoux
- Alkion Biopharma SAS, 4 rue Pierre Fontaine, 91058 Evry, France
| | - Andreas G Lössl
- Department of Applied Plant Sciences and Plant Biotechnology, University of Natural Resources and Applied Life Sciences (BOKU), Vienna, Austria
| | - Peter J Nixon
- Department of Life Sciences, Sir Ernst Chain Building-Wolfson Laboratories, Imperial College, South Kensington Campus, London SW7 2AZ, UK
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63
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Muralikrishna N, Srinivas K, Kumar KB, Sadanandam A. Stable plastid transformation in Scoparia dulcis L. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2016; 22:575-581. [PMID: 27924130 PMCID: PMC5120043 DOI: 10.1007/s12298-016-0386-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 09/28/2016] [Accepted: 10/10/2016] [Indexed: 05/16/2023]
Abstract
In the present investigation we report stable plastid transformation in Scoparia dulcis L., a versatile medicinal herb via particle gun method. The vector KNTc, harbouring aadA as a selectable marker and egfp as a reporter gene which were under the control of synthetic promoter pNG1014a, targets inverted repeats, trnR/trnN of the plastid genome. By use of this heterologous vector, recovery of transplastomic lines with suitable selection protocol have been successfully established with overall efficiency of two transgenic lines for 25 bombarded leaf explants. PCR and Southern blot analysis demonstrated stable integration of foreign gene into the target sequences. The results represent a significant advancement of the plastid transformation technology in medicinal plants, which relevantly implements a change over in enhancing and regulating of certain metabolic pathways.
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Affiliation(s)
| | - Kota Srinivas
- Department of Biotechnology, Kakatiya University, Warangal, 506009 India
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Gottschamel J, Lössl A, Ruf S, Wang Y, Skaugen M, Bock R, Clarke JL. Production of dengue virus envelope protein domain III-based antigens in tobacco chloroplasts using inducible and constitutive expression systems. PLANT MOLECULAR BIOLOGY 2016; 91:497-512. [PMID: 27116001 DOI: 10.1007/s11103-016-0484-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Accepted: 04/17/2016] [Indexed: 06/05/2023]
Abstract
Dengue fever is a disease in many parts of the tropics and subtropics and about half the world's population is at risk of infection according to the World Health Organization. Dengue is caused by any of the four related dengue virus serotypes DEN-1, -2, -3 and -4, which are transmitted to people by Aedes aegypti mosquitoes. Currently there is only one vaccine (Dengvaxia(®)) available (limited to a few countries) on the market since 2015 after half a century's intensive efforts. Affordable and accessible vaccines against dengue are hence still urgently needed. The dengue envelop protein domain III (EDIII), which is capable of eliciting serotype-specific neutralizing antibodies, has become the focus for subunit vaccine development. To contribute to the development of an accessible and affordable dengue vaccine, in the current study we have used plant-based vaccine production systems to generate a dengue subunit vaccine candidate in tobacco. Chloroplast genome engineering was applied to express serotype-specific recombinant EDIII proteins in tobacco chloroplasts using both constitutive and ethanol-inducible expression systems. Expression of a tetravalent antigen fusion construct combining EDIII polypeptides from all four serotypes was also attempted. Transplastomic EDIII-expressing tobacco lines were obtained and homoplasmy was verified by Southern blot analysis. Northern blot analyses showed expression of EDIII antigen-encoding genes. EDIII protein accumulation levels varied for the different recombinant EDIII proteins and the different expression systems, and reached between 0.8 and 1.6 % of total cellular protein. Our study demonstrates the suitability of the chloroplast compartment as a production site for an EDIII-based vaccine candidate against dengue fever and presents a Gateway(®) plastid transformation vector for inducible transgene expression.
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Affiliation(s)
- Johanna Gottschamel
- NIBIO-Norwegian Institute of Bioeconomy Research, P.O. Box 115, 1431, Ås, Norway
- BOKU-University of Natural Resources and Life Sciences, Gregor-Mendel-Straße 33, 1180, Vienna, Austria
| | - Andreas Lössl
- BOKU-University of Natural Resources and Life Sciences, Gregor-Mendel-Straße 33, 1180, Vienna, Austria
| | - Stephanie Ruf
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam-Golm, Germany
| | - Yanliang Wang
- NIBIO-Norwegian Institute of Bioeconomy Research, P.O. Box 115, 1431, Ås, Norway
| | | | - Ralph Bock
- Max Planck Institute of Molecular Plant Physiology, Am Mühlenberg 1, 14476, Potsdam-Golm, Germany.
| | - Jihong Liu Clarke
- NIBIO-Norwegian Institute of Bioeconomy Research, P.O. Box 115, 1431, Ås, Norway.
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Daniell H, Lin CS, Yu M, Chang WJ. Chloroplast genomes: diversity, evolution, and applications in genetic engineering. Genome Biol 2016; 17:134. [PMID: 27339192 PMCID: PMC4918201 DOI: 10.1186/s13059-016-1004-2] [Citation(s) in RCA: 750] [Impact Index Per Article: 93.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Chloroplasts play a crucial role in sustaining life on earth. The availability of over 800 sequenced chloroplast genomes from a variety of land plants has enhanced our understanding of chloroplast biology, intracellular gene transfer, conservation, diversity, and the genetic basis by which chloroplast transgenes can be engineered to enhance plant agronomic traits or to produce high-value agricultural or biomedical products. In this review, we discuss the impact of chloroplast genome sequences on understanding the origins of economically important cultivated species and changes that have taken place during domestication. We also discuss the potential biotechnological applications of chloroplast genomes.
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Affiliation(s)
- Henry Daniell
- Department of Biochemistry, School of Dental Medicine, University of Pennsylvania, South 40th St, Philadelphia, PA, 19104-6030, USA.
| | - Choun-Sea Lin
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
| | - Ming Yu
- Department of Biochemistry, School of Dental Medicine, University of Pennsylvania, South 40th St, Philadelphia, PA, 19104-6030, USA
| | - Wan-Jung Chang
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
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Li Y, Wang R, Hu Z, Li H, Lu S, Zhang J, Lin Y, Zhou F. Expression of a Codon-Optimized dsdA Gene in Tobacco Plastids and Rice Nucleus Confers D-Serine Tolerance. FRONTIERS IN PLANT SCIENCE 2016; 7:640. [PMID: 27242842 PMCID: PMC4863892 DOI: 10.3389/fpls.2016.00640] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Accepted: 04/26/2016] [Indexed: 06/05/2023]
Abstract
D-serine is toxic to plants. D-serine ammonia lyase, which is encoded by the dsdA gene, can attenuate this toxicity with high specificity. In the present study, we explored the function of codon-optimized dsdA with tobacco plastids and rice nuclear transformation system. It was shown that dsdA gene was site-specifically integrated into the tobacco plastid genome and displayed a high level of expression. Genetic analysis of the progenies showed that dsdA gene is maternally inherited and confers sufficient D-serine resistance in tobacco. The effective screening concentrations of D-serine for seed germination, callus regeneration and foliar spray were 10, 30, and 75 mM, respectively. In addition, calluses from homozygous transgenic rice lines also showed significant tolerance to D-serine (up to 75 mM). Our study proves the feasibility of using dsdA gene as a selectable marker in both plastid and nuclear transformation systems.
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Cheng S, Xie X, Xu Y, Zhang C, Wang X, Zhang J, Wang Y. Genetic transformation of a fruit-specific, highly expressed stilbene synthase gene from Chinese wild Vitis quinquangularis. PLANTA 2016; 243:1041-53. [PMID: 26781778 DOI: 10.1007/s00425-015-2459-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 12/22/2015] [Indexed: 05/09/2023]
Abstract
The stilbene synthase gene VqSTS6, from Chinese wild type Vitis quinquangularis accession Danfeng-2, increases the resveratrol content and pathogen resistance of transgenic plants of V. vinifera Thompson Seedless. This study successfully created transgenic plants of V. vinifera Thompson Seedless which overexpressed VqSTS6, cloned from Chinese wild type V. quinquangularis accession Danfeng-2. Western blot and qRT-PCR showed a variable range in transcript levels among transgenic lines. The resistance to powdery mildew (Uncinula necator) was particularly enhanced in lines most highly expressing VqSTS6. Compared with the non-transformed controls, trans-resveratrol and other stilbene compounds were significantly increased in the transgenic lines. The correlation between high resveratrol content and high pathogen resistance in transgenic grapes is discussed. We hypothesize that the fruit-specific, highly expressed gene VqSTS6 from Chinese wild V. quinquangularis accession Danfeng-2, is directly involved in the resveratrol synthesis pathway in grapes, and plays an important role in the plant's defense against pathogens. Genetic transformation of VqSTS6 explored the potential of the wild Chinese grape species for use in breeding, the results of which would raise both the disease resistance and the fruit quality of V. vinifera grapevines.
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Affiliation(s)
- Siyan Cheng
- College of Horticulture, Northwest A & F University, No.3, Taicheng Road, Yangling, 712100, Shaanxi, People's Republic of China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Xiaoqing Xie
- College of Horticulture, Northwest A & F University, No.3, Taicheng Road, Yangling, 712100, Shaanxi, People's Republic of China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Yan Xu
- College of Horticulture, Northwest A & F University, No.3, Taicheng Road, Yangling, 712100, Shaanxi, People's Republic of China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Chaohong Zhang
- College of Horticulture, Northwest A & F University, No.3, Taicheng Road, Yangling, 712100, Shaanxi, People's Republic of China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Xiping Wang
- College of Horticulture, Northwest A & F University, No.3, Taicheng Road, Yangling, 712100, Shaanxi, People's Republic of China
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China
| | - Jianxia Zhang
- College of Horticulture, Northwest A & F University, No.3, Taicheng Road, Yangling, 712100, Shaanxi, People's Republic of China.
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China.
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
| | - Yuejin Wang
- College of Horticulture, Northwest A & F University, No.3, Taicheng Road, Yangling, 712100, Shaanxi, People's Republic of China.
- Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China, Ministry of Agriculture, Yangling, 712100, Shaanxi, People's Republic of China.
- State Key Laboratory of Crop Stress Biology in Arid Areas, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China.
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Boehm CR, Ueda M, Nishimura Y, Shikanai T, Haseloff J. A Cyan Fluorescent Reporter Expressed from the Chloroplast Genome of Marchantia polymorpha. PLANT & CELL PHYSIOLOGY 2016; 57:291-9. [PMID: 26634291 PMCID: PMC4788411 DOI: 10.1093/pcp/pcv160] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 10/21/2015] [Indexed: 05/10/2023]
Abstract
Recently, the liverwort Marchantia polymorpha has received increasing attention as a basal plant model for multicellular studies. Its ease of handling, well-characterized plastome and proven protocols for biolistic plastid transformation qualify M. polymorpha as an attractive platform to study the evolution of chloroplasts during the transition from water to land. In addition, chloroplasts of M. polymorpha provide a convenient test-bed for the characterization of genetic elements involved in plastid gene expression due to the absence of mechanisms for RNA editing. While reporter genes have proven valuable to the qualitative and quantitative study of gene expression in chloroplasts, expression of green fluorescent protein (GFP) in chloroplasts of M. polymorpha has proven problematic. We report the design of a codon-optimized gfp varian, mturq2cp, which allowed successful expression of a cyan fluorescent protein under control of the tobacco psbA promoter from the chloroplast genome of M. polymorpha. We demonstrate the utility of mturq2cp in (i) early screening for transplastomic events following biolistic transformation of M. polymorpha spores; (ii) visualization of stromules as elements of plastid structure in Marchantia; and (iii) quantitative microscopy for the analysis of promoter activity.
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Affiliation(s)
- Christian R Boehm
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
| | - Minoru Ueda
- Department of Botany, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan Present address: RIKEN Center for Sustainable Resource Science, 1-7-22 Suehiro, Tsurumi, Yokohama, 230-0045 Japan
| | - Yoshiki Nishimura
- Department of Botany, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan
| | - Toshiharu Shikanai
- Department of Botany, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502 Japan CREST, Japan Science and Technology Agency, Chiyoda-ku, Tokyo, 102-0076 Japan
| | - Jim Haseloff
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
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Quétier F. The CRISPR-Cas9 technology: Closer to the ultimate toolkit for targeted genome editing. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2016; 242:65-76. [PMID: 26566825 DOI: 10.1016/j.plantsci.2015.09.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 09/01/2015] [Accepted: 09/02/2015] [Indexed: 05/23/2023]
Abstract
The first period of plant genome editing was based on Agrobacterium; chemical mutagenesis by EMS (ethyl methanesulfonate) and ionizing radiations; each of these technologies led to randomly distributed genome modifications. The second period is associated with the discoveries of homing and meganuclease enzymes during the 80s and 90s, which were then engineered to provide efficient tools for targeted editing. From 2006 to 2012, a few crop plants were successfully and precisely modified using zinc-finger nucleases. A third wave of improvement in genome editing, which led to a dramatic decrease in off-target events, was achieved in 2009-2011 with the TALEN technology. The latest revolution surfaced in 2013 with the CRISPR-Cas9 system, whose high efficiency and technical ease of use is really impressive; scientists can use in-house kits or commercially available kits; the only two requirements are to carefully choose the location of the DNA double strand breaks to be induced and then to order an oligonucleotide. While this close-to- ultimate toolkit for targeted editing of genomes represents dramatic scientific progress which allows the development of more complex useful agronomic traits through synthetic biology, the social acceptance of genome editing remains regularly questioned by anti-GMO citizens and organizations.
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Affiliation(s)
- Francis Quétier
- University of Evry Val d'Essonne, Evry 91025, France; Genopole, Evry 91025, France.
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70
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Klinger J, Fischer R, Commandeur U. Comparison of Thermobifida fusca Cellulases Expressed in Escherichia coli and Nicotiana tabacum Indicates Advantages of the Plant System for the Expression of Bacterial Cellulases. FRONTIERS IN PLANT SCIENCE 2015; 6:1047. [PMID: 26648951 PMCID: PMC4664618 DOI: 10.3389/fpls.2015.01047] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 11/09/2015] [Indexed: 06/05/2023]
Abstract
The economic conversion of lignocellulosic biomass to biofuels requires in addition to pretreatment techniques access to large quantities of inexpensive cellulases to be competitive with established first generation processes. A solution to this problem could be achieved by plant based expression of these enzymes. We expressed the complete set of six cellulases and an additional β-glucosidase expressed from Thermobifida fusca in the bacterium Escherichia coli and in tobacco plants (Nicotiana tabacum). This was done to determine whether functional enzyme expression was feasible in these organisms. In extracts of recombinant E. coli cells, five of the proteins were detected by western blot analysis, but exocellulases E3 and E6 were undetectable. In the plant-based expression system we were able to detect all six cellulases but not the β-glucosidase even though activity was detectable. When E. coli was used as the expression system, endocellulase E2 was active, while endocellulases E1 and E5 showed only residual activity. The remaining cellulases appeared completely inactive against the model substrates azo-carboxymethyl-cellulose (Azo-CMC) and 4-methylumbelliferyl-cellobioside (4-MUC). Only the β-glucosidase showed high activity against 4-MUC. In contrast, all the plant-derived enzymes were active against the respective model substrates. Our data indicate that some enzymes of bacterial origin are more active and more efficiently expressed in plants than in a bacterial host.
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Affiliation(s)
- Johannes Klinger
- Institute for Biology VII (Molecular Biotechnology), RWTH Aachen UniversityAachen, Germany
| | - Rainer Fischer
- Institute for Biology VII (Molecular Biotechnology), RWTH Aachen UniversityAachen, Germany
- Fraunhofer Institute for Molecular Biology and Applied EcologyAachen, Germany
| | - Ulrich Commandeur
- Institute for Biology VII (Molecular Biotechnology), RWTH Aachen UniversityAachen, Germany
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71
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Tohge T, Fernie AR. Metabolomics-Inspired Insight into Developmental, Environmental and Genetic Aspects of Tomato Fruit Chemical Composition and Quality. PLANT & CELL PHYSIOLOGY 2015; 56:1681-96. [PMID: 26228272 DOI: 10.1093/pcp/pcv093] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 06/12/2015] [Indexed: 05/20/2023]
Abstract
Tomato was one of the first plant species to be evaluated using metabolomics and remains one of the best characterized, with tomato fruit being both an important source of nutrition in the human diet and a valuable model system for the development of fleshy fruits. Additionally, given the broad habitat range of members of the tomato clade and the extensive use of exotic germplasm in tomato genetic research, it represents an excellent genetic model system for understanding both metabolism per se and the importance of various metabolites in conferring stress tolerance. This review summarizes technical approaches used to characterize the tomato metabolome to date and details insights into metabolic pathway structure and regulation that have been obtained via analysis of tissue samples taken under different developmental or environmental circumstance as well as following genetic perturbation. Particular attention is paid to compounds of importance for nutrition or the shelf-life of tomatoes. We propose furthermore how metabolomics information can be coupled to the burgeoning wealth of genome sequence data from the tomato clade to enhance further our understanding of (i) the shifts in metabolic regulation occurring during development and (ii) specialization of metabolism within the tomato clade as a consequence of either adaptive evolution or domestication.
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Affiliation(s)
- Takayuki Tohge
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany
| | - Alisdair R Fernie
- Max-Planck-Institute of Molecular Plant Physiology, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany
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Larraya LM, Fernández‐San Millán A, Ancín, M, Farran I, Veramendi J. Post‐harvest light treatment increases expression levels of recombinant proteins in transformed plastids of potato tubers. Biotechnol J 2015; 10:1803-13. [DOI: 10.1002/biot.201500028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 05/21/2015] [Accepted: 06/25/2015] [Indexed: 01/22/2023]
Affiliation(s)
- Luis M. Larraya
- Instituto de Agrobiotecnología, Universidad Pública de Navarra‐CSIC, Departamento de Producción Agraria, Pamplona, Spain
| | - Alicia Fernández‐San Millán
- Instituto de Agrobiotecnología, Universidad Pública de Navarra‐CSIC, Departamento de Producción Agraria, Pamplona, Spain
| | - María Ancín,
- Instituto de Agrobiotecnología, Universidad Pública de Navarra‐CSIC, Departamento de Producción Agraria, Pamplona, Spain
| | - Inmaculada Farran
- Instituto de Agrobiotecnología, Universidad Pública de Navarra‐CSIC, Departamento de Producción Agraria, Pamplona, Spain
| | - Jon Veramendi
- Instituto de Agrobiotecnología, Universidad Pública de Navarra‐CSIC, Departamento de Producción Agraria, Pamplona, Spain
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Espinoza-Sánchez EA, Álvarez-Hernández MH, Torres-Castillo JA, Rascón-Cruz Q, Gutiérrez-Díez A, Zavala-García F, Sinagawa-García SR. Stable expression and characterization of a fungal pectinase and bacterial peroxidase genes in tobacco chloroplast. ELECTRON J BIOTECHN 2015. [DOI: 10.1016/j.ejbt.2015.03.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
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Bock R. Engineering plastid genomes: methods, tools, and applications in basic research and biotechnology. ANNUAL REVIEW OF PLANT BIOLOGY 2015; 66:211-41. [PMID: 25494465 DOI: 10.1146/annurev-arplant-050213-040212] [Citation(s) in RCA: 218] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The small bacterial-type genome of the plastid (chloroplast) can be engineered by genetic transformation, generating cells and plants with transgenic plastid genomes, also referred to as transplastomic plants. The transformation process relies on homologous recombination, thereby facilitating the site-specific alteration of endogenous plastid genes as well as the precisely targeted insertion of foreign genes into the plastid DNA. The technology has been used extensively to analyze chloroplast gene functions and study plastid gene expression at all levels in vivo. Over the years, a large toolbox has been assembled that is now nearly comparable to the techniques available for plant nuclear transformation and that has enabled new applications of transplastomic technology in basic and applied research. This review describes the state of the art in engineering the plastid genomes of algae and land plants (Embryophyta). It provides an overview of the existing tools for plastid genome engineering, discusses current technological limitations, and highlights selected applications that demonstrate the immense potential of chloroplast transformation in several key areas of plant biotechnology.
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Affiliation(s)
- Ralph Bock
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, D-14476 Potsdam-Golm, Germany;
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Rogalski M, do Nascimento Vieira L, Fraga HP, Guerra MP. Plastid genomics in horticultural species: importance and applications for plant population genetics, evolution, and biotechnology. FRONTIERS IN PLANT SCIENCE 2015; 6:586. [PMID: 26284102 PMCID: PMC4520007 DOI: 10.3389/fpls.2015.00586] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 07/15/2015] [Indexed: 05/20/2023]
Abstract
During the evolution of the eukaryotic cell, plastids, and mitochondria arose from an endosymbiotic process, which determined the presence of three genetic compartments into the incipient plant cell. After that, these three genetic materials from host and symbiont suffered several rearrangements, bringing on a complex interaction between nuclear and organellar gene products. Nowadays, plastids harbor a small genome with ∼130 genes in a 100-220 kb sequence in higher plants. Plastid genes are mostly highly conserved between plant species, being useful for phylogenetic analysis in higher taxa. However, intergenic spacers have a relatively higher mutation rate and are important markers to phylogeographical and plant population genetics analyses. The predominant uniparental inheritance of plastids is like a highly desirable feature for phylogeny studies. Moreover, the gene content and genome rearrangements are efficient tools to capture and understand evolutionary events between different plant species. Currently, genetic engineering of the plastid genome (plastome) offers a number of attractive advantages as high-level of foreign protein expression, marker gene excision, gene expression in operon and transgene containment because of maternal inheritance of plastid genome in most crops. Therefore, plastid genome can be used for adding new characteristics related to synthesis of metabolic compounds, biopharmaceutical, and tolerance to biotic and abiotic stresses. Here, we describe the importance and applications of plastid genome as tools for genetic and evolutionary studies, and plastid transformation focusing on increasing the performance of horticultural species in the field.
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Affiliation(s)
- Marcelo Rogalski
- Laboratório de Fisiologia Molecular de Plantas, Departamento de Biologia Vegetal, Universidade Federal de ViçosaViçosa, Brazil
| | - Leila do Nascimento Vieira
- Laboratório de Fisiologia do Desenvolvimento e Genética Vegetal, Programa de Pós-graduação em Recursos Genéticos Vegetais, Centro de Ciências Agrárias, Universidade Federal de Santa CatarinaFlorianópolis, Brazil
| | - Hugo P. Fraga
- Laboratório de Fisiologia do Desenvolvimento e Genética Vegetal, Programa de Pós-graduação em Recursos Genéticos Vegetais, Centro de Ciências Agrárias, Universidade Federal de Santa CatarinaFlorianópolis, Brazil
| | - Miguel P. Guerra
- Laboratório de Fisiologia do Desenvolvimento e Genética Vegetal, Programa de Pós-graduação em Recursos Genéticos Vegetais, Centro de Ciências Agrárias, Universidade Federal de Santa CatarinaFlorianópolis, Brazil
- *Correspondence: Miguel P. Guerra, Laboratório de Fisiologia do Desenvolvimento e Genética Vegetal, Programa de Pós-graduação em Recursos Genéticos Vegetais, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina, Rod. Admar Gonzaga, 1346 Florianópolis, SC 88034-000, Brazil,
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76
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Gerszberg A, Hnatuszko-Konka K, Kowalczyk T. In vitro regeneration of eight cultivars of Brassica oleracea var. capitata. IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY. PLANT : JOURNAL OF THE TISSUE CULTURE ASSOCIATION 2015; 51:80-87. [PMID: 25774081 DOI: 10.1007/s11240-014-0664-4] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Accepted: 09/08/2014] [Indexed: 05/22/2023]
Abstract
Eight cultivars of Brassica oleracea var. capitata and two types of explant (hypocotyl and cotyledon) were tested for their potential to regenerate under in vitro conditions. Hypocotyl and cotyledon explants from 10-d-old seedlings were subcultured onto different callus induction media based on Murashige and Skoog (MS) basal medium supplemented with 1% sucrose and different concentrations and combinations of plant growth regulators. Hypocotyl explants were found to be more suitable for callus induction and organogenesis than cotyledon explants for all cultivars tested. In terms of regeneration, the cv. 'Amager' was significantly more responsive than the other cultivars tested and produced the highest number of shoots/buds per explant. Moreover, among five types of media tested, MS + 8.88 μM 6-benzyloaminopurine (BAP) + 0.53 μM α-naphthylacetic acid (NAA) was most effective for shoot regeneration. Rooting was achieved within 10-15 d on all the rooting media, but MS medium containing 5.37 μM NAA produced the maximum number of strong and healthy roots. Plantlets (95%) were subsequently established in the greenhouse, and no phenotypic variations were observed among regenerated plants. This plant regeneration protocol could be suitable for a wide range of cabbage cultivars.
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Affiliation(s)
- Aneta Gerszberg
- Department of Genetics Plant Molecular Biology and Biotechnology, University of Lodz, Banacha Street 12/16, 90-237 Lodz, Poland
| | - Katarzyna Hnatuszko-Konka
- Department of Genetics Plant Molecular Biology and Biotechnology, University of Lodz, Banacha Street 12/16, 90-237 Lodz, Poland
| | - Tomasz Kowalczyk
- Department of Genetics Plant Molecular Biology and Biotechnology, University of Lodz, Banacha Street 12/16, 90-237 Lodz, Poland
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Ramundo S, Rochaix JD. Controlling expression of genes in the unicellular alga Chlamydomonas reinhardtii with a vitamin-repressible riboswitch. Methods Enzymol 2014; 550:267-81. [PMID: 25605390 DOI: 10.1016/bs.mie.2014.10.035] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Chloroplast genomes of land plants and algae contain generally between 100 and 150 genes. These genes are involved in plastid gene expression and photosynthesis and in various other tasks. The function of some chloroplast genes is still unknown and some of them appear to be essential for growth and survival. Repressible and reversible expression systems are highly desirable for functional and biochemical characterization of these genes. We have developed a genetic tool that allows one to regulate the expression of any coding sequence in the chloroplast genome of the unicellular alga Chlamydomonas reinhardtii. Our system is based on vitamin-regulated expression of the nucleus-encoded chloroplast Nac2 protein, which is specifically required for the expression of any plastid gene fused to the psbD 5'UTR. With this approach, expression of the Nac2 gene in the nucleus and, in turn, that of the chosen chloroplast gene artificially driven by the psbD 5'UTR, is controlled by the MetE promoter and Thi4 riboswitch, which can be inactivated in a reversible way by supplying vitamin B12 and thiamine to the growth medium, respectively. This system opens interesting possibilities for studying the assembly and turnover of chloroplast multiprotein complexes such as the photosystems, the ribosome, and the RNA polymerase. It also provides a way to overcome the toxicity often associated with the expression of proteins of biotechnological interest in the chloroplast.
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Affiliation(s)
- Silvia Ramundo
- Departments of Molecular Biology and Plant Biology, University of Geneva, Geneva, Switzerland
| | - Jean-David Rochaix
- Departments of Molecular Biology and Plant Biology, University of Geneva, Geneva, Switzerland.
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78
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Abstract
Petunia hybrida is a commercial ornamental plant and is also an important model species for genetic analysis and transgenic research. Here we describe the steps required to isolate stable plastid transformants in P. hybrida using the commercial Pink Wave cultivar. Wave cultivars are popular spreading Petunias sold as ground cover and potted plants. Transgenes introduced into P. hybrida plastids exhibit stable expression over many generations. The development of plastid transformation in P. hybrida provides an enabling technology to bring the benefits of plastid engineering, including maternal inheritance and stable expression of performance-enhancing trait genes, to the important floriculture and horticulture industries.
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79
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Yang Y, Yuanye D, Qing L, Jinjian L, Xiwen L, Yitao W. Complete chloroplast genome sequence of poisonous and medicinal plant Datura stramonium: organizations and implications for genetic engineering. PLoS One 2014; 9:e110656. [PMID: 25365514 PMCID: PMC4217734 DOI: 10.1371/journal.pone.0110656] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Accepted: 09/24/2014] [Indexed: 11/19/2022] Open
Abstract
Datura stramonium is a widely used poisonous plant with great medicinal and economic value. Its chloroplast (cp) genome is 155,871 bp in length with a typical quadripartite structure of the large (LSC, 86,302 bp) and small (SSC, 18,367 bp) single-copy regions, separated by a pair of inverted repeats (IRs, 25,601 bp). The genome contains 113 unique genes, including 80 protein-coding genes, 29 tRNAs and four rRNAs. A total of 11 forward, 9 palindromic and 13 tandem repeats were detected in the D. stramonium cp genome. Most simple sequence repeats (SSR) are AT-rich and are less abundant in coding regions than in non-coding regions. Both SSRs and GC content were unevenly distributed in the entire cp genome. All preferred synonymous codons were found to use A/T ending codons. The difference in GC contents of entire genomes and of the three-codon positions suggests that the D. stramonium cp genome might possess different genomic organization, in part due to different mutational pressures. The five most divergent coding regions and four non-coding regions (trnH-psbA, rps4-trnS, ndhD-ccsA, and ndhI-ndhG) were identified using whole plastome alignment, which can be used to develop molecular markers for phylogenetics and barcoding studies within the Solanaceae. Phylogenetic analysis based on 68 protein-coding genes supported Datura as a sister to Solanum. This study provides valuable information for phylogenetic and cp genetic engineering studies of this poisonous and medicinal plant.
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Affiliation(s)
- Yang Yang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Dang Yuanye
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Li Qing
- Department of Pharmacy, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Lu Jinjian
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
| | - Li Xiwen
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
| | - Wang Yitao
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau, China
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80
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Low frequency paternal transmission of plastid genes in Brassicaceae. Transgenic Res 2014; 24:267-77. [PMID: 25343875 DOI: 10.1007/s11248-014-9842-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Accepted: 10/14/2014] [Indexed: 11/25/2022]
Abstract
Plastid-encoded genes are maternally inherited in most plant species. Transgenes located on the plastid genome are thus within a natural confinement system, preventing their distribution via pollen. However, a low-frequency leakage of plastids via pollen seems to be universal in plants. Here we report that a very low-level paternal inheritance in Arabidopsis thaliana occurs under field conditions. As pollen donor an Arabidopsis accession (Ler-Ely) was used, which carried a plastid-localized atrazine resistance due to a point mutation in the psbA gene. The frequency of pollen transmission into F1 plants, based on their ability to express the atrazine resistance was 1.9 × 10(-5). We extended our analysis to another cruciferous species, the world-wide cultivated crop Brassica napus. First, we isolated a fertile and stable plastid transformant (T36) in a commercial cultivar of B. napus (cv Drakkar). In T36 the aadA and the bar genes were integrated in the inverted repeat region of the B. napus plastid DNA following particle bombardment of hypocotyl segments. Southern blot analysis confirmed transgene integration and homoplasmy of plastid DNA. Line T36 expressed Basta resistance from the inserted bar gene and this trait was used to estimate the frequency of pollen transmission into F1 plants. A frequency of <2.6 × 10(-5) was determined in the greenhouse. Taken together, our data show a very low rate of paternal plastid transmission in Brassicacea. Moreover, the establishment of plastid transformation in B. napus facilitates a safe use of this important crop plant for plant biotechnology.
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81
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Vafaee Y, Staniek A, Mancheno-Solano M, Warzecha H. A modular cloning toolbox for the generation of chloroplast transformation vectors. PLoS One 2014; 9:e110222. [PMID: 25302695 PMCID: PMC4193872 DOI: 10.1371/journal.pone.0110222] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 09/15/2014] [Indexed: 11/18/2022] Open
Abstract
Plastid transformation is a powerful tool for basic research, but also for the generation of stable genetically engineered plants producing recombinant proteins at high levels or for metabolic engineering purposes. However, due to the genetic makeup of plastids and the distinct features of the transformation process, vector design, and the use of specific genetic elements, a large set of basic transformation vectors is required, making cloning a tedious and time-consuming effort. Here, we describe the adoption of standardized modular cloning (GoldenBraid) to the design and assembly of the full spectrum of plastid transformation vectors. The modular design of genetic elements allows straightforward and time-efficient build-up of transcriptional units as well as construction of vectors targeting any homologous recombination site of choice. In a three-level assembly process, we established a vector fostering gene expression and formation of griffithsin, a potential viral entry inhibitor and HIV prophylactic, in the plastids of tobacco. Successful transformation as well as transcript and protein production could be shown. In concert with the aforesaid endeavor, a set of modules facilitating plastid transformation was generated, thus augmenting the GoldenBraid toolbox. In short, the work presented in this study enables efficient application of synthetic biology methods to plastid transformation in plants.
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Affiliation(s)
- Yavar Vafaee
- Plant Biotechnology and Metabolic Engineering, Technische Universität Darmstadt, Darmstadt, Germany
| | - Agata Staniek
- Plant Biotechnology and Metabolic Engineering, Technische Universität Darmstadt, Darmstadt, Germany
| | - Maria Mancheno-Solano
- Plant Biotechnology and Metabolic Engineering, Technische Universität Darmstadt, Darmstadt, Germany
| | - Heribert Warzecha
- Plant Biotechnology and Metabolic Engineering, Technische Universität Darmstadt, Darmstadt, Germany
- * E-mail:
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82
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Dutt M, Dhekney SA, Soriano L, Kandel R, Grosser JW. Temporal and spatial control of gene expression in horticultural crops. HORTICULTURE RESEARCH 2014; 1:14047. [PMID: 26504550 PMCID: PMC4596326 DOI: 10.1038/hortres.2014.47] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 07/19/2014] [Accepted: 08/06/2014] [Indexed: 05/05/2023]
Abstract
Biotechnology provides plant breeders an additional tool to improve various traits desired by growers and consumers of horticultural crops. It also provides genetic solutions to major problems affecting horticultural crops and can be a means for rapid improvement of a cultivar. With the availability of a number of horticultural genome sequences, it has become relatively easier to utilize these resources to identify DNA sequences for both basic and applied research. Promoters play a key role in plant gene expression and the regulation of gene expression. In recent years, rapid progress has been made on the isolation and evaluation of plant-derived promoters and their use in horticultural crops, as more and more species become amenable to genetic transformation. Our understanding of the tools and techniques of horticultural plant biotechnology has now evolved from a discovery phase to an implementation phase. The availability of a large number of promoters derived from horticultural plants opens up the field for utilization of native sequences and improving crops using precision breeding. In this review, we look at the temporal and spatial control of gene expression in horticultural crops and the usage of a variety of promoters either isolated from horticultural crops or used in horticultural crop improvement.
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Affiliation(s)
- Manjul Dutt
- Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL 33850, USA
| | - Sadanand A Dhekney
- Department of Plant Sciences, Sheridan Research and Extension Center, University of Wyoming, Sheridan, WY 82801, USA
| | - Leonardo Soriano
- Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL 33850, USA
- Universidade de Sao Paulo, Centro de Energia Nuclear na Agricultura, Piracicaba, Brazil
| | - Raju Kandel
- Department of Plant Sciences, Sheridan Research and Extension Center, University of Wyoming, Sheridan, WY 82801, USA
| | - Jude W Grosser
- Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, FL 33850, USA
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83
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Scharff LB, Bock R. Synthetic biology in plastids. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2014; 78:783-98. [PMID: 24147738 DOI: 10.1111/tpj.12356] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 10/08/2013] [Accepted: 10/16/2013] [Indexed: 05/21/2023]
Abstract
Plastids (chloroplasts) harbor a small gene-dense genome that is amenable to genetic manipulation by transformation. During 1 billion years of evolution from the cyanobacterial endosymbiont to present-day chloroplasts, the plastid genome has undergone a dramatic size reduction, mainly as a result of gene losses and the large-scale transfer of genes to the nuclear genome. Thus the plastid genome can be regarded as a naturally evolved miniature genome, the gradual size reduction and compaction of which has provided a blueprint for the design of minimum genomes. Furthermore, because of the largely prokaryotic genome structure and gene expression machinery, the high transgene expression levels attainable in transgenic chloroplasts and the very low production costs in plant systems, the chloroplast lends itself to synthetic biology applications that are directed towards the efficient synthesis of green chemicals, biopharmaceuticals and other metabolites of commercial interest. This review describes recent progress with the engineering of plastid genomes with large constructs of foreign or synthetic DNA, and highlights the potential of the chloroplast as a model system in bottom-up and top-down synthetic biology approaches.
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Affiliation(s)
- Lars B Scharff
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476, Potsdam-Golm, Germany
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84
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Chen PJ, Senthilkumar R, Jane WN, He Y, Tian Z, Yeh KW. Transplastomic Nicotiana benthamiana plants expressing multiple defence genes encoding protease inhibitors and chitinase display broad-spectrum resistance against insects, pathogens and abiotic stresses. PLANT BIOTECHNOLOGY JOURNAL 2014; 12:503-15. [PMID: 24479648 DOI: 10.1111/pbi.12157] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 11/29/2013] [Accepted: 11/29/2013] [Indexed: 05/07/2023]
Abstract
Plastid engineering provides several advantages for the next generation of transgenic technology, including the convenient use of transgene stacking and the generation of high expression levels of foreign proteins. With the goal of generating transplastomic plants with multiresistance against both phytopathogens and insects, a construct containing a monocistronic patterned gene stack was transformed into Nicotiana benthamiana plastids harbouring sweet potato sporamin, taro cystatin and chitinase from Paecilomyces javanicus. Transplastomic lines were screened and characterized by Southern/Northern/Western blot analysis for the confirmation of transgene integration and respective expression level. Immunogold localization analyses confirmed the high level of accumulation proteins that were specifically expressed in leaf and root plastids. Subsequent functional bioassays confirmed that the gene stacks conferred a high level of resistance against both insects and phytopathogens. Specifically, larva of Spodoptera litura and Spodoptera exigua either died or exhibited growth retardation after ingesting transplastomic plant leaves. In addition, the inhibitory effects on both leaf spot diseases caused by Alternaria alternata and soft rot disease caused by Pectobacterium carotovorum subsp. carotovorum were markedly observed. Moreover, tolerance to abiotic stresses such as salt/osmotic stress was highly enhanced. The results confirmed that the simultaneous expression of sporamin, cystatin and chitinase conferred a broad spectrum of resistance. Conversely, the expression of single transgenes was not capable of conferring such resistance. To the best of our knowledge, this is the first study to demonstrate an efficacious stacked combination of plastid-expressed defence genes which resulted in an engineered tolerance to various abiotic and biotic stresses.
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Affiliation(s)
- Peng-Jen Chen
- Institute of Plant Biology, College of Life Science, National Taiwan University, Taipei, Taiwan
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85
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Shchelkunov SN, Shchelkunova GA. Plant-based vaccines against human hepatitis B virus. Expert Rev Vaccines 2014; 9:947-55. [DOI: 10.1586/erv.10.67] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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86
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Valkov VT, Gargano D, Scotti N, Cardi T. Plastid transformation in potato: Solanum tuberosum. Methods Mol Biol 2014; 1132:295-303. [PMID: 24599861 DOI: 10.1007/978-1-62703-995-6_18] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Although plastid transformation has attractive advantages and potential applications in plant biotechnology, for long time it has been highly efficient only in tobacco. The lack of efficient selection and regeneration protocols and, for some species, the inefficient recombination using heterologous flanking regions in transformation vectors prevented the extension of the technology to major crops. However, the availability of this technology for species other than tobacco could offer new possibilities in plant breeding, such as resistance management or improvement of nutritional value, with no or limited environmental concerns. Herein we describe an efficient plastid transformation protocol for potato (Solanum tuberosum subsp. tuberosum). By optimizing the tissue culture system and using transformation vectors carrying homologous potato flanking sequences, we obtained up to one transplastomic shoot per bombardment. Such efficiency is comparable to that usually achieved in tobacco. The method described in this chapter can be used to regenerate potato transplastomic plants expressing recombinant proteins in chloroplasts as well as in amyloplasts.
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Affiliation(s)
- Vladimir T Valkov
- CNR-IBBR, National Research Council of Italy, Institute of Biosciences and BioResources, Naples, Italy
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87
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Abstract
The plastid genome (plastome) has proved a valuable source of data for evaluating evolutionary relationships among angiosperms. Through basic and applied approaches, plastid transformation technology offers the potential to understand and improve plant productivity, providing food, fiber, energy and medicines to meet the needs of a burgeoning global population. The growing genomic resources available to both phylogenetic and biotechnological investigations are allowing novel insights and expanding the scope of plastome research to encompass new species. In this chapter we present an overview of some of the seminal and contemporary research that has contributed to our current understanding of plastome evolution and attempt to highlight the relationship between evolutionary mechanisms and tools of plastid genetic engineering.
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Affiliation(s)
- Tracey A Ruhlman
- Integrative Biology, University of Texas at Austin, Austin, TX, USA
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88
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Bergougnoux V. The history of tomato: From domestication to biopharming. Biotechnol Adv 2014; 32:170-89. [DOI: 10.1016/j.biotechadv.2013.11.003] [Citation(s) in RCA: 169] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 10/24/2013] [Accepted: 11/03/2013] [Indexed: 11/28/2022]
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89
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Abstract
Tomato (Solanum lycopersicum) is one of the most important vegetable crops and has long been an important model species in plant biology. Plastid biology in tomato is especially interesting due to the chloroplast-to-chromoplast conversion occurring during fruit ripening. Moreover, as tomato represents a major food crop with an edible fruit that can be eaten raw, the development of a plastid transformation protocol for tomato was of particular interest to plant biotechnology. Recent methodological improvements have made tomato plastid transformation more efficient and facilitated applications in metabolic engineering and molecular farming. This article describes the basic methods involved in the generation and analysis of tomato plants with transgenic chloroplast genomes and summarizes current applications of tomato plastid transformation.
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90
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Bock R. Strategies for metabolic pathway engineering with multiple transgenes. PLANT MOLECULAR BIOLOGY 2013; 83:21-31. [PMID: 23504453 DOI: 10.1007/s11103-013-0045-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 03/11/2013] [Indexed: 05/21/2023]
Abstract
The engineering of metabolic pathways in plants often requires the concerted expression of more than one gene. While with traditional transgenic approaches, the expression of multiple transgenes has been challenging, recent progress has greatly expanded our repertoire of powerful techniques making this possible. New technological options include large-scale co-transformation of the nuclear genome, also referred to as combinatorial transformation, and transformation of the chloroplast genome with synthetic operon constructs. This review describes the state of the art in multigene genetic engineering of plants. It focuses on the methods currently available for the introduction of multiple transgenes into plants and the molecular mechanisms underlying successful transgene expression. Selected examples of metabolic pathway engineering are used to illustrate the attractions and limitations of each method and to highlight key factors that influence the experimenter's choice of the best strategy for multigene engineering.
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Affiliation(s)
- Ralph Bock
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, 14476 Potsdam-Golm, Germany.
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91
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Krech K, Fu HY, Thiele W, Ruf S, Schöttler MA, Bock R. Reverse genetics in complex multigene operons by co-transformation of the plastid genome and its application to the open reading frame previously designated psbN. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2013; 75:1062-74. [PMID: 23738654 DOI: 10.1111/tpj.12256] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 05/24/2013] [Accepted: 06/03/2013] [Indexed: 05/28/2023]
Abstract
Reverse genetics approaches have contributed enormously to the elucidation of gene functions in plastid genomes and the determination of structure-function relationships in chloroplast multiprotein complexes. Gene knock-outs are usually performed by disrupting the reading frame of interest with a selectable marker cassette. Site-directed mutagenesis is done by placing the marker into the adjacent intergenic spacer and relying on co-integration of the desired mutation by homologous recombination. These strategies are not applicable to genes residing in large multigene operons or other gene-dense genomic regions, because insertion of the marker cassette into an operon-internal gene or into the nearest intergenic spacer is likely to interfere with expression of adjacent genes in the operon or disrupt cis-elements for the expression of neighboring genes and operons. Here we have explored the possibility of using a co-transformation strategy to mutate a small gene of unknown function (psbN) that is embedded in a complex multigene operon. Although inactivation of psbN resulted in strong impairment of photosynthesis, homoplasmic knock-out lines were readily recovered by co-transformation with a selectable marker integrating >38 kb away from the targeted psbN. Our results suggest co-transformation as a suitable strategy for the functional analysis of plastid genes and operons, which allows the recovery of unselected homoplasmic mutants even if the introduced mutations entail a significant selective disadvantage. Moreover, our data provide evidence for involvement of the psbN gene product in the biogenesis of both photosystem I and photosystem II. We therefore propose to rename the gene product 'photosystem biogenesis factor 1' and the gene pbf1.
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Affiliation(s)
- Katharina Krech
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476, Potsdam-Golm, Germany
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92
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Clarke JL, Waheed MT, Lössl AG, Martinussen I, Daniell H. How can plant genetic engineering contribute to cost-effective fish vaccine development for promoting sustainable aquaculture? PLANT MOLECULAR BIOLOGY 2013; 83:33-40. [PMID: 23729352 PMCID: PMC3755229 DOI: 10.1007/s11103-013-0081-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Accepted: 05/23/2013] [Indexed: 05/19/2023]
Abstract
Aquaculture, the fastest growing food-producing sector, now accounts for nearly 50 % of the world's food fish (FAO in The state of world fisheries and aquaculture. FAO, Rome, 2010). The global aquaculture production of food fish reached 62.7 million tonnes in 2011 and is continuously increasing with an estimated production of food fish of 66.5 million tonnes in 2012 (a 9.4 % increase in 1 year, FAO, www.fao.org/fishery/topic/16140 ). Aquaculture is not only important for sustainable protein-based food fish production but also for the aquaculture industry and economy worldwide. Disease prevention is the key issue to maintain a sustainable development of aquaculture. Widespread use of antibiotics in aquaculture has led to the development of antibiotic-resistant bacteria and the accumulation of antibiotics in the environment, resulting in water and soil pollution. Thus, vaccination is the most effective and environmentally-friendly approach to combat diseases in aquaculture to manage fish health. Furthermore, when compared to >760 vaccines against human diseases, there are only about 30 fish vaccines commercially available, suggesting the urgent need for development and cost-effective production of fish vaccines for managing fish health, especially in the fast growing fish farming in Asia where profit is minimal and therefore given high priority. Plant genetic engineering has made significant contributions to production of biotech crops for food, feed, valuable recombinant proteins etc. in the past three decades. The use of plants for vaccine production offers several advantages such as low cost, safety and easy scaling up. To date a large number of plant-derived vaccines, antibodies and therapeutic proteins have been produced for human health, of which a few have been made commercially available. However, the development of animal vaccines in plants, especially fish vaccines by genetic engineering, has not yet been addressed. Therefore, there is a need to exploit plant biotechnology for cost effective fish vaccine development in plants, in particular, edible crops for oral fish vaccines. This review provides insight into (1) the current status of fish vaccine and vaccination in aquaculture, (2) plant biotechnology and edible crops for fish vaccines for oral administration, (3) regulatory constraints and (4) conclusions and future perspectives.
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Affiliation(s)
- Jihong Liu Clarke
- Bioforsk, Norwegian Institute for Agricultural and Environmental Research, Ås, Norway.
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93
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Bock R. Genetic engineering of the chloroplast: novel tools and new applications. Curr Opin Biotechnol 2013; 26:7-13. [PMID: 24679252 DOI: 10.1016/j.copbio.2013.06.004] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Accepted: 06/28/2013] [Indexed: 10/26/2022]
Abstract
The plastid genome represents an attractive target of genetic engineering in crop plants. Plastid transgenes often give high expression levels, can be stacked in operons and are largely excluded from pollen transmission. Recent research has greatly expanded our toolbox for plastid genome engineering and many new proof-of-principle applications have highlighted the enormous potential of the transplastomic technology in both crop improvement and the development of plants as bioreactors for the sustainable and cost-effective production of biopharmaceuticals, enzymes and raw materials for the chemical industry. This review describes recent technological advances with plastid transformation in seed plants. It focuses on novel tools for plastid genome engineering and transgene expression and summarizes progress with harnessing the potential of plastid transformation in biotechnology.
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Affiliation(s)
- Ralph Bock
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany.
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94
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Sang Y, Millwood RJ, Neal Stewart C. Gene use restriction technologies for transgenic plant bioconfinement. PLANT BIOTECHNOLOGY JOURNAL 2013; 11:649-658. [PMID: 23730743 DOI: 10.1111/pbi.12084] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 04/03/2013] [Accepted: 04/09/2013] [Indexed: 06/02/2023]
Abstract
The advances of modern plant technologies, especially genetically modified crops, are considered to be a substantial benefit to agriculture and society. However, so-called transgene escape remains and is of environmental and regulatory concern. Genetic use restriction technologies (GURTs) provide a possible solution to prevent transgene dispersal. Although GURTs were originally developed as a way for intellectual property protection (IPP), we believe their maximum benefit could be in the prevention of gene flow, that is, bioconfinement. This review describes the underlying signal transduction and components necessary to implement any GURT system. Furthermore, we review the similarities and differences between IPP- and bioconfinement-oriented GURTs, discuss the GURTs' design for impeding transgene escape and summarize recent advances. Lastly, we go beyond the state of the science to speculate on regulatory and ecological effects of implementing GURTs for bioconfinement.
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Affiliation(s)
- Yi Sang
- Department of Plant Sciences, University of Tennessee, Knoxville, TN, USA
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95
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Kolotilin I, Kaldis A, Pereira EO, Laberge S, Menassa R. Optimization of transplastomic production of hemicellulases in tobacco: effects of expression cassette configuration and tobacco cultivar used as production platform on recombinant protein yields. BIOTECHNOLOGY FOR BIOFUELS 2013; 6:65. [PMID: 23642171 PMCID: PMC3655837 DOI: 10.1186/1754-6834-6-65] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 04/29/2013] [Indexed: 05/21/2023]
Abstract
BACKGROUND Chloroplast transformation in tobacco has been used extensively to produce recombinant proteins and enzymes. Chloroplast expression cassettes can be designed with different configurations of the cis-acting elements that govern foreign gene expression. With the aim to optimize production of recombinant hemicellulases in transplastomic tobacco, we developed a set of cassettes that incorporate elements known to facilitate protein expression in chloroplasts and examined expression and accumulation of a bacterial xylanase XynA. Biomass production is another important factor in achieving sustainable and high-volume production of cellulolytic enzymes. Therefore, we compared productivity of two tobacco cultivars - a low-alkaloid and a high-biomass - as transplastomic expression platforms. RESULTS Four different cassettes expressing XynA produced various mutant phenotypes of the transplastomic plants, affected their growth rate and resulted in different accumulation levels of the XynA enzyme. The most productive cassette was identified and used further to express XynA and two additional fungal xylanases, Xyn10A and Xyn11B, in a high-biomass tobacco cultivar. The high biomass cultivar allowed for a 60% increase in XynA production per plant. Accumulation of the fungal enzymes reached more than 10-fold higher levels than the bacterial enzyme, constituting up to 6% of the total soluble protein in the leaf tissue. Use of a well-characterized translational enhancer with the selected expression cassette revealed inconsistent effects on accumulation of the recombinant xylanases. Additionally, differences in the enzymatic activity of crude plant extracts measured in leaves of different age suggest presence of a specific xylanase inhibitor in the green leaf tissue. CONCLUSION Our results demonstrate the pivotal importance of the expression cassette design and appropriate tobacco cultivar for high-level transplastomic production of recombinant proteins.
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Affiliation(s)
- Igor Kolotilin
- Southern Crop Protection and Food Research Centre, Agriculture and Agri-Food Canada, London, ON, Canada
| | - Angelo Kaldis
- Southern Crop Protection and Food Research Centre, Agriculture and Agri-Food Canada, London, ON, Canada
| | - Eridan Orlando Pereira
- Southern Crop Protection and Food Research Centre, Agriculture and Agri-Food Canada, London, ON, Canada
- Department of Biology, Western University, London, ON, Canada
| | - Serge Laberge
- Soils and Crops Research Development Center, Agriculture and Agri-Food Canada, Québec, QC, Canada
| | - Rima Menassa
- Southern Crop Protection and Food Research Centre, Agriculture and Agri-Food Canada, London, ON, Canada
- Department of Biology, Western University, London, ON, Canada
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96
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Michoux F, Ahmad N, Hennig A, Nixon PJ, Warzecha H. Production of leafy biomass using temporary immersion bioreactors: an alternative platform to express proteins in transplastomic plants with drastic phenotypes. PLANTA 2013; 237:903-8. [PMID: 23262582 PMCID: PMC3579415 DOI: 10.1007/s00425-012-1829-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Accepted: 12/03/2012] [Indexed: 05/30/2023]
Abstract
Chloroplast transformation technology is a promising approach for the production of foreign proteins in plants with expression levels of up to 70 % of total soluble protein (TSP) achieved in tobacco. However, expression of foreign protein in the chloroplast can lead to drastic or even lethal effects in transplastomic plants grown in soil, thereby potentially limiting the applicability of this technology. For instance, previous attempts to express the outer surface protein A (OspA) from Borrelia burgdorferi in tobacco chloroplasts led to plant death when expressed at 10 % TSP. We show here that this earlier transplastomic line, as well as a new plant line, OspA:YFP, expressing OspA fused to the yellow fluorescent protein, can be propagated in temporary immersion bioreactors (TIBs) using AlkaBurst™ technology to produce leafy biomass that expressed OspA at levels of up to 7.6 % TSP, to give a maximum yield of OspA of about 108 mg/L. Our results show that TIBs provide an alternative method for the production of transplastomic biomass expressing proteins toxic for plants and is a particularly useful approach when 'absolute' containment is required.
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Affiliation(s)
- Franck Michoux
- Alkion Biopharma SAS, 4 rue Pierre Fontaine, 91058, Evry, France.
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97
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Lu Y, Rijzaani H, Karcher D, Ruf S, Bock R. Efficient metabolic pathway engineering in transgenic tobacco and tomato plastids with synthetic multigene operons. Proc Natl Acad Sci U S A 2013; 110:E623-32. [PMID: 23382222 PMCID: PMC3581966 DOI: 10.1073/pnas.1216898110] [Citation(s) in RCA: 147] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The engineering of complex metabolic pathways requires the concerted expression of multiple genes. In plastids (chloroplasts) of plant cells, genes are organized in operons that are coexpressed as polycistronic transcripts and then often are processed further into monocistronic mRNAs. Here we have used the tocochromanol pathway (providing tocopherols and tocotrienols, collectively also referred to as "vitamin E") as an example to establish principles of successful multigene engineering by stable transformation of the chloroplast genome, a technology not afflicted with epigenetic variation and/or instability of transgene expression. Testing a series of single-gene constructs (encoding homogentisate phytyltransferase, tocopherol cyclase, and γ-tocopherol methyltransferase) and rationally designed synthetic operons in tobacco and tomato plants, we (i) confirmed previous results suggesting homogentisate phytyltransferase as the limiting enzymatic step in the pathway, (ii) comparatively characterized the bottlenecks in tocopherol biosynthesis in transplastomic leaves and tomato fruits, and (iii) achieved an up to tenfold increase in total tocochromanol accumulation. In addition, our results uncovered an unexpected light-dependent regulatory link between tocochromanol metabolism and the pathways of photosynthetic pigment biosynthesis. The synthetic operon design developed here will facilitate future synthetic biology applications in plastids, especially the design of artificial operons that introduce novel biochemical pathways into plants.
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Affiliation(s)
- Yinghong Lu
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, D-14476 Potsdam-Golm, Germany
| | | | - Daniel Karcher
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, D-14476 Potsdam-Golm, Germany
| | - Stephanie Ruf
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, D-14476 Potsdam-Golm, Germany
| | - Ralph Bock
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, D-14476 Potsdam-Golm, Germany
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98
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Caroca R, Howell KA, Hasse C, Ruf S, Bock R. Design of chimeric expression elements that confer high-level gene activity in chromoplasts. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2013; 73:368-79. [PMID: 23004223 DOI: 10.1111/tpj.12031] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 09/14/2012] [Accepted: 09/17/2012] [Indexed: 05/05/2023]
Abstract
Non-green plastids, such as chromoplasts, generally have much lower activity of gene expression than chloroplasts in photosynthetically active tissues. Suppression of plastid genes in non-green tissues occurs through a complex interplay of transcriptional and translational control, with the contribution of regulation of transcript abundance versus translational activity being highly variable between genes. Here, we have investigated whether the low expression of the plastid genome in chromoplasts results from inherent limitations in gene expression capacity, or can be overcome by designing appropriate combinations of promoters and translation initiation signals in the 5' untranslated region (5'-UTR). We constructed chimeric expression elements that combine promoters and 5'-UTRs from plastid genes, which are suppressed during chloroplast-to-chromoplast conversion in Solanum lycopersicum (tomato) fruit ripening, either just at the translational level or just at the level of mRNA accumulation. These chimeric expression elements were introduced into the tomato plastid genome by stable chloroplast transformation. We report the identification of promoter-UTR combinations that confer high-level gene expression in chromoplasts of ripe tomato fruits, resulting in the accumulation of reporter protein GFP to up to 1% of total cellular protein. Our work demonstrates that non-green plastids are capable of expressing genes to high levels. Moreover, the chimeric cis-elements for chromoplasts developed here are widely applicable in basic and applied research using transplastomic methods.
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Affiliation(s)
- Rodrigo Caroca
- Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476, Potsdam-Golm, Germany
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99
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Production of pharmaceutical proteins in solanaceae food crops. Int J Mol Sci 2013; 14:2753-73. [PMID: 23434646 PMCID: PMC3588013 DOI: 10.3390/ijms14022753] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 01/11/2013] [Accepted: 01/22/2013] [Indexed: 12/13/2022] Open
Abstract
The benefits of increased safety and cost-effectiveness make vegetable crops appropriate systems for the production and delivery of pharmaceutical proteins. In particular, Solanaceae edible crops could be inexpensive biofactories for oral vaccines and other pharmaceutical proteins that can be ingested as minimally processed extracts or as partially purified products. The field of crop plant biotechnology is advancing rapidly due to novel developments in genetic and genomic tools being made available today for the scientific community. In this review, we briefly summarize data now available regarding genomic resources for the Solanaceae family. In addition, we describe novel strategies developed for the expression of foreign proteins in vegetable crops and the utilization of these techniques to manufacture pharmaceutical proteins.
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100
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Shanmugabalaji V, Besagni C, Piller LE, Douet V, Ruf S, Bock R, Kessler F. Dual targeting of a mature plastoglobulin/fibrillin fusion protein to chloroplast plastoglobules and thylakoids in transplastomic tobacco plants. PLANT MOLECULAR BIOLOGY 2013; 81:13-25. [PMID: 23086498 DOI: 10.1007/s11103-012-9977-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Accepted: 10/08/2012] [Indexed: 05/10/2023]
Abstract
Plastoglobules (PG) are lipid droplets in chloroplasts and other plastid types having important functions in lipid metabolism. Plastoglobulins (PGL) also known as fibrillins (FBN) are evolutionary conserved proteins present at the PG surface but also to various extents at the thylakoid membrane. PGLs are thought to have structural functions in PG formation and maintenance. The targeting of an Arabidopsis PGL (PGL34) to PG required the full protein sequence with the exception of a short C-terminal stretch. This indicated that PGL targeting relies on correct folding rather than a discrete sequence. PGLs lack strongly hydrophic regions and may therefore extrinsically associate with PG and thylakoid membranes via interaction with hydrophilic headgroups of surface lipids. Here, we report on the expression of the Arabidopsis plastoglobulin of 35kD (PGL35 or FBN1a) expressed as a mature protein fused to HIVp24 (human immunodeficiency virus capsid particle p24) or HCV (hepatitis C virus core protein) in transplastomic tobacco. A PGL35-HIVp24 fusion targeted in part to plastoglobules but a larger proportion was recovered in the thylakoid fraction. The findings indicate that transplastomic PGL35-HIVp24 folded correctly after its synthesis inside the chloroplast and then dually targeted to plastoglobules as well as thylakoid membranes.
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