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Niu L, Ding H, Hao R, Liu H, Wu X, Hu X, Wang W. A rapid and universal method for isolating starch granules in plant tissues. PLANT, CELL & ENVIRONMENT 2019; 42:3355-3371. [PMID: 31429107 DOI: 10.1111/pce.13631] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 07/23/2019] [Indexed: 06/10/2023]
Abstract
Starch is the major form of carbohydrate storage in plants and exists as discrete starch granules (SGs). Isolation of high-quality SGs in different plant tissues is a prerequisite for studying the roles of SGs during plant growth, development, and responses to abiotic stress. However, it is difficult to isolate transitory SGs from leaves and storage SGs from pollen grains due to their small sizes and low quantities. Herein, we develop a novel method for isolating SGs by using the aqueous two-phase system (ATS) of ethanol/NaH2 PO4 . The ATS method efficiently separated SGs from contaminants based on their differences in density, solubility, and polarity. Using this method, we first isolated and purified three kinds of SGs from maize seeds, pollen, and leaves. The biochemical, microscopic, and proteomic analyses demonstrated the high purity of the isolated SGs. Proteomic analysis revealed distinct differences in SG-bound proteins between seed SGs and pollen SGs. As a simple, rapid, and low-cost method, the ATS-based method exhibits highly universal and reproducible results for starch-containing tissues in various plant species.
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Affiliation(s)
- Liangjie Niu
- State Key Laboratory of Wheat and Maize Crop Science, College of Life Sciences, Henan Agricultural University, Zhengzhou, 450002, China
| | - Huiying Ding
- State Key Laboratory of Wheat and Maize Crop Science, College of Life Sciences, Henan Agricultural University, Zhengzhou, 450002, China
| | - Ruiqi Hao
- State Key Laboratory of Wheat and Maize Crop Science, College of Life Sciences, Henan Agricultural University, Zhengzhou, 450002, China
| | - Hui Liu
- State Key Laboratory of Wheat and Maize Crop Science, College of Life Sciences, Henan Agricultural University, Zhengzhou, 450002, China
| | - Xiaolin Wu
- State Key Laboratory of Wheat and Maize Crop Science, College of Life Sciences, Henan Agricultural University, Zhengzhou, 450002, China
| | - Xiuli Hu
- State Key Laboratory of Wheat and Maize Crop Science, College of Life Sciences, Henan Agricultural University, Zhengzhou, 450002, China
| | - Wei Wang
- State Key Laboratory of Wheat and Maize Crop Science, College of Life Sciences, Henan Agricultural University, Zhengzhou, 450002, China
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Sabella E, Aprile A, Genga A, Siciliano T, Nutricati E, Nicolì F, Vergine M, Negro C, De Bellis L, Luvisi A. Xylem cavitation susceptibility and refilling mechanisms in olive trees infected by Xylella fastidiosa. Sci Rep 2019; 9:9602. [PMID: 31270378 PMCID: PMC6610111 DOI: 10.1038/s41598-019-46092-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 06/19/2019] [Indexed: 01/09/2023] Open
Abstract
In olive trees, Xylella fastidiosa colonizes xylem vessels and compromises water transport causing the olive quick decline syndrome (OQDS). The loss of hydraulic conductivity could be attributed to vessel occlusions induced both by the bacteria biofilm and by plant responses (tyloses, gums, etc.) that could trigger embolism. The ability of the infected plants to detect embolism and to respond, by activating mechanisms to restore the hydraulic conductivity, can influence the severity of the disease symptomatology. In order to investigate these mechanisms in the X. fastidiosa-resistant olive cultivar Leccino and in the susceptible Cellina di Nardò, sections of healthy olive stems were analysed by laser scanning microscope to calculate the cavitation vulnerability index. Findings indicated that the cultivar Leccino seems to be constitutively less susceptible to cavitation than the susceptible one. Among the vascular refilling mechanisms, starch hydrolysis is a well-known strategy to refill xylem vessels that suffered cavitation and it is characterized by a dense accumulation of starch grains in the xylem parenchima; SEM-EDX analysis of stem cross-sections of infected plants revealed an aggregation of starch grains in the Leccino xylem vessels. These observations could indicate that this cultivar, as well as being anatomically less susceptible to cavitation, it also could be able to activate more efficient refilling mechanisms, restoring vessel's hydraulic conductivity. In order to verify this hypothesis, we analysed the expression levels of some genes belonging to families involved in embolism sensing and refilling mechanisms: aquaporins, sucrose transporters, carbohydrate metabolism and enzymes related to starch breakdown, alpha and beta-amylase. The obtained genes expression patterns suggested that the infected plants of the cultivar Leccino strongly modulates the genes involved in embolism sensing and refilling.
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Affiliation(s)
- Erika Sabella
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Prov.le Monteroni 165, 73100, Lecce, Italy
| | - Alessio Aprile
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Prov.le Monteroni 165, 73100, Lecce, Italy.
| | - Alessandra Genga
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Prov.le Monteroni 165, 73100, Lecce, Italy
| | - Tiziana Siciliano
- Department of Physic and Math, University of Salento, via Prov.le Monteroni 165, 73100, Lecce, Italy
| | - Eliana Nutricati
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Prov.le Monteroni 165, 73100, Lecce, Italy
| | - Francesca Nicolì
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Prov.le Monteroni 165, 73100, Lecce, Italy
| | - Marzia Vergine
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Prov.le Monteroni 165, 73100, Lecce, Italy
| | - Carmine Negro
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Prov.le Monteroni 165, 73100, Lecce, Italy
| | - Luigi De Bellis
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Prov.le Monteroni 165, 73100, Lecce, Italy
| | - Andrea Luvisi
- Department of Biological and Environmental Sciences and Technologies, University of Salento, via Prov.le Monteroni 165, 73100, Lecce, Italy
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Olivry T, Bexley J. Cornstarch is less allergenic than corn flour in dogs and cats previously sensitized to corn. BMC Vet Res 2018; 14:207. [PMID: 29945608 PMCID: PMC6020376 DOI: 10.1186/s12917-018-1538-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 06/19/2018] [Indexed: 12/15/2022] Open
Abstract
Background Corn appears to be an uncommon food source of allergens in dogs and cats. There is limited information on the nature of the corn allergens in dogs and cats and their presence in the various foodstuffs used in commercial pet foods. The aim of this study was to determine if serum IgE from corn-sensitized dogs and cats recognized proteins in corn flour and cornstarch, which are common sources of carbohydrates in pet foods. Results We selected archived sera from allergy-suspected dogs (40) and cats (40) with either undetectable, low, medium or high serum levels of corn-specific IgE. These sera were tested then by ELISA on plates coated with extracts made from corn kernels, corn flour, cornstarch and the starch used in the commercially-available extensively-hydrolyzed pet food Anallergenic (Royal Canin). Immunoblotting was then performed on the same extracts with some of the sera from moderate-to-high corn-sensitized dogs and cats. Using ELISA, it is mostly the dogs and cats with moderate and high corn-specific IgE levels that also had IgE identifying allergens in the flour (dogs: 20/30 sera, 67% - cats: 20/29, 69%). In contrast, none of the tested sera had measurable IgE against proteins isolated from the cornstarch. Immunoblotting confirmed the existence of numerous major corn allergens in the corn kernel extract, fewer in that of the corn flour, while such allergens were not detectable using this technique in the two cornstarch extracts. Conclusions In this study, ELISA and immunoblotting results suggest that IgE from corn-sensitized dogs are less likely to recognize allergens in cornstarch than in kernel and flour extracts. As corn is not a common allergen source in dogs and cats, and as its starch seems to be less allergenic than its flour, pet foods containing cornstarch as a carbohydrate source are preferable for dogs and cats suspected of suffering from corn allergy. Electronic supplementary material The online version of this article (10.1186/s12917-018-1538-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Thierry Olivry
- Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, 1060 Willliam Moore Drive, Raleigh, NC, 27606, USA. .,Comparative Medicine Institute, College of Veterinary Medicine, North Carolina State University, Raleigh, NC, USA.
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Koziol AG, Marquez BK, Huebsch MP, Smith JC, Altosaar I. Commercially Produced Rice and Maize Starches Contain Nonhost Proteins, as Shown by Mass Spectrometry. Cereal Chem 2012. [DOI: 10.1094/cchem-04-12-0043-n] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Adam G. Koziol
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada, K1H 8M5
| | - Benazir K. Marquez
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada, K1H 8M5
| | - Matthew P. Huebsch
- Department of Chemistry, Carleton University, Ottawa, Ontario, Canada, K1S 5B6
| | - Jeffrey C. Smith
- Department of Chemistry, Carleton University, Ottawa, Ontario, Canada, K1S 5B6
| | - Illimar Altosaar
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada, K1H 8M5
- Corresponding author. Phone: (613) 562-5800, ext. 6374. Fax: (613) 562-5452. E-mail:
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Koziol AG, Loit E, McNulty M, MacFarlane AJ, Scott FW, Altosaar I. Seed storage proteins of the globulin family are cleaved post-translationally in wheat embryos. BMC Res Notes 2012; 5:385. [PMID: 22838494 PMCID: PMC3434096 DOI: 10.1186/1756-0500-5-385] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2012] [Accepted: 07/09/2012] [Indexed: 01/26/2023] Open
Abstract
Background The 7S globulins are plant seed storage proteins that have been associated with the development of a number of human diseases, including peanut allergy. Immune reactivity to the wheat seed storage protein globulin-3 (Glo-3) has been associated with the development of the autoimmune disease type 1 diabetes in diabetes-prone rats and mice, as well as in a subset of human patients. Findings The present study characterized native wheat Glo-3 in salt-soluble wheat seed protein extracts. Glo-3-like peptides were observed primarily in the wheat embryo. Glo-3-like proteins varied significantly in their molecular masses and isoelectric points, as determined by two dimensional electrophoresis and immunoblotting with anti-Glo-3A antibodies. Five major polypeptide spots were identified by mass spectrometry and N-terminal sequencing as belonging to the Glo-3 family. Conclusions These results in combination with our previous findings have allowed for the development of a hypothetical model of the post-translational events contributing to the wheat 7S globulin profile in mature wheat kernels.
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Affiliation(s)
- Adam G Koziol
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada
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Taga I, Lan CQ, Altosaar I. Plant Essential Oils and Mastitis Disease: Their Potential Inhibitory Effects on Pro-inflammatory Cytokine Production in Response to Bacteria Related Inflammation. Nat Prod Commun 2012. [DOI: 10.1177/1934578x1200700534] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
This paper highlights the role of plant volatile organic compounds, found in essential oils, for the treatment of bacteria related inflammation. This report is focused on tea tree oil, particularly its main compound terpinen-4-ol. Analysis of the published literature shows that many essential oils have significant antibacterial, antifungal and anti-inflammatory effects. Some of their major components, such as terpinen-4-ol, act by inhibiting pro-inflammatory cytokine expression while stimulating production of anti-inflammatory cytokines. Such observations may be exploited to encourage biotherapy against mastitis. The use of synthetic antibiotics is being increasingly discouraged because their presence in dairy milk may have potential downstream effects on population health and the agri-food chain. In the context of inflammation and related mammalian responses, understanding the interplay between volatile organic compounds, especially terpinen-4-ol, and cytokines during bacteria related inflammation should clarify their mode of action to control mastitis.
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Affiliation(s)
- Ibrahim Taga
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, K1H 8M5, Canada
| | - Christopher Q. Lan
- Department of Chemical and Biological Engineering, Faculty of Engineering, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Illimar Altosaar
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Ontario, K1H 8M5, Canada
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The starch granule associated proteomes of commercially purified starch reference materials from rice and maize. J Proteomics 2012; 75:993-1003. [DOI: 10.1016/j.jprot.2011.10.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 10/17/2011] [Accepted: 10/21/2011] [Indexed: 11/24/2022]
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Finnie C, Sultan A, Grasser KD. From protein catalogues towards targeted proteomics approaches in cereal grains. PHYTOCHEMISTRY 2011; 72:1145-1153. [PMID: 21134685 DOI: 10.1016/j.phytochem.2010.11.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Revised: 11/09/2010] [Accepted: 11/11/2010] [Indexed: 05/27/2023]
Abstract
Due to their importance for human nutrition, the protein content of cereal grains has been a subject of intense study for over a century and cereal grains were not surprisingly one of the earliest subjects for 2D-gel-based proteome analysis. Over the last two decades, countless cereal grain proteomes, mostly derived using 2D-gel based technologies, have been described and hundreds of proteins identified. However, very little is still known about post-translational modifications, subcellular proteomes, and protein-protein interactions in cereal grains. Development of techniques for improved extraction, separation and identification of proteins and peptides is facilitating functional proteomics and analysis of sub-proteomes from small amounts of starting material, such as seed tissues. The combination of proteomics with structural and functional analysis is increasingly applied to target subsets of proteins. These "next-generation" proteomics studies will vastly increase our depth of knowledge about the processes controlling cereal grain development, nutritional and processing characteristics.
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Affiliation(s)
- Christine Finnie
- Enzyme and Protein Chemistry, Department of Systems Biology, Technical University of Denmark, Søltofts Plads, Bldg 224, DK-2800 Kgs. Lyngby, Denmark.
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Knief C, Delmotte N, Vorholt JA. Bacterial adaptation to life in association with plants - A proteomic perspective from culture to in situ conditions. Proteomics 2011; 11:3086-105. [PMID: 21548095 DOI: 10.1002/pmic.201000818] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 02/01/2011] [Accepted: 02/17/2011] [Indexed: 12/13/2022]
Abstract
Diverse bacterial taxa that live in association with plants affect plant health and development. This is most evident for those bacteria that undergo a symbiotic association with plants or infect the plants as pathogens. Proteome analyses have contributed significantly toward a deeper understanding of the molecular mechanisms underlying the development of these associations. They were applied to obtain a general overview of the protein composition of these bacteria, but more so to study effects of plant signaling molecules on the cytosolic proteome composition or metabolic adaptations upon plant colonization. Proteomic analyses are particularly useful for the identification of secreted proteins, which are indispensable to manipulate a host plant. Recent advances in the field of proteome analyses have initiated a new research area, the analysis of more complex microbial communities. Such studies are just at their beginning but hold great potential for the future to elucidate not only the interactions between bacteria and their host plants, but also of bacteria-bacteria interactions between different bacterial taxa when living in association with plants. These include not only the symbiotic and pathogenic bacteria, but also the commensal bacteria that are consistently found in association with plants and whose functions remain currently largely uncovered.
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Affiliation(s)
- Claudia Knief
- Institute of Microbiology, ETH Zurich, Zurich, Switzerland
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Spencer WJ, Binette A, Ward TL, Davis LDR, Blais DR, Harrold J, Mack DR, Altosaar I. Alpha-lactalbumin in human milk alters the proteolytic degradation of soluble CD14 by forming a complex. Pediatr Res 2010; 68:490-3. [PMID: 20717070 DOI: 10.1203/pdr.0b013e3181f70f21] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Mother's milk represents a foundational step in the proper development of newborn immunity. This is achieved, in part, through the action of numerous regulatory proteins such as soluble cluster of differentiation 14 (sCD14) found in significant quantities in human milk (~25-50 μg/mL). In adults, CD14 stimulates cytokine production in response to lipopolysaccharide (LPS), the major lipid component found in the outer membrane of Gram-negative bacteria. However, the fate and function of sCD14 in the neonatal gastrointestinal (GI) tract are unknown and may function differently from adults. Therefore, we administered human sCD14 to experimental animals and observed that it persisted in the upper GI tract after feeding. In our search for potential proteolytic protectants, immunoprecipitation of sCD14 from human milk revealed a 15-kD novel protein that copurified with sCD14. Mass spectrometry analysis of the protein identified alpha-lactalbumin. CD14 was also identified by immunoblot after immunoprecipitation of alpha-lactalbumin from milk. In vitro digestion assays revealed that purified alpha-lactalbumin decreases the proteolytic degradation of human milk derived sCD14 in vitro, suggesting a mechanism by which this key LPS receptor may remain functional in the neonate gut.
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Affiliation(s)
- William J Spencer
- Department of Biochemistry, University of Ottawa, Ottawa, Ontario K1H 8M5, Canada
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The tryptophan-rich domain of puroindoline is directly associated with the starch granule surface as judged by tryptic shaving and mass spectrometry. J Cereal Sci 2010. [DOI: 10.1016/j.jcs.2010.04.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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