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Shaheen N, Hossen MS, Akhter KT, Halima O, Hasan MK, Wahab A, Gamagedara S, Bhargava K, Holmes T, Najar FZ, Khandaker M, Peng Z, Yang Z, Ahsan N. Comparative Seed Proteome Profile Reveals No Alternation of Major Allergens in High-Yielding Mung Bean Cultivars. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024. [PMID: 38836763 DOI: 10.1021/acs.jafc.4c01054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
Mung bean contains up to 32.6% protein and is one of the great sources of plant-based protein. Because many allergens also function as defense-related proteins, it is important to determine their abundance levels in the high-yielding, disease-resistant cultivars. In this study, for the first time, we compared the seed proteome of high-yielding mung bean cultivars developed by a conventional breeding approach. Using a label-free quantitative proteomic platform, we successfully identified and quantified a total of 1373 proteins. Comparative analysis between the high-yielding disease-resistant cultivar (MC5) and the other three cultivars showed that a total of 69 common proteins were significantly altered in their abundances across all cultivars. Bioinformatic analysis of these altered proteins demonstrated that PDF1 (a defensin-like protein) exhibited high sequence similarity and epitope matching with the established peanut allergens, indicating a potential mung bean allergen that showed a cultivar-specific response. Conversely, known mung bean allergen proteins such as PR-2/PR-10 (Vig r 1), Vig r 2, Vig r 4, LTP1, β-conglycinin, and glycinin G4 showed no alternation in the MC5 compared to other cultivars. Taken together, our findings suggest that the known allergen profiles may not be impacted by the conventional plant breeding method to develop improved mung bean cultivars.
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Affiliation(s)
- Nazma Shaheen
- Institute of Nutrition and Food Science, University of Dhaka, Dhaka 1000, Bangladesh
| | - Md Sujan Hossen
- Bangladesh Council of Scientific and Industrial Research, Dhaka 1205, Bangladesh
| | - Kazi Turjaun Akhter
- Institute of Nutrition and Food Science, University of Dhaka, Dhaka 1000, Bangladesh
| | - Oumma Halima
- Institute of Nutrition and Food Science, University of Dhaka, Dhaka 1000, Bangladesh
| | - Md Kamrul Hasan
- Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, ON L8S 4L8, Canada
| | - Asfia Wahab
- Department of Biology, University of York, York YO10, U.K
| | - Sanjeewa Gamagedara
- Department of Chemistry, University of Central Oklahoma, Edmond, Oklahoma 73034, United States
| | - Kanika Bhargava
- Department of Human Environmental Sciences, University of Central Oklahoma, Edmond, Oklahoma 73034, United States
| | - Tawni Holmes
- Department of Human Environmental Sciences, University of Central Oklahoma, Edmond, Oklahoma 73034, United States
| | - Fares Z Najar
- High-Performance Computing Center, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Morshed Khandaker
- Nanobiology Laboratory, School of Engineering, University of Central Oklahoma, Edmond, Oklahoma 73034, United States
| | - Zongkai Peng
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Zhibo Yang
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Nagib Ahsan
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
- Mass Spectrometry, Proteomics and Metabolomics Core Facility, Stephenson Life Sciences Research Center, The University of Oklahoma, Norman, Oklahoma 73019, United States
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Li W, Keller AA. Optimization of Targeted Plant Proteomics Using Liquid Chromatography with Tandem Mass Spectrometry (LC-MS/MS). ACS AGRICULTURAL SCIENCE & TECHNOLOGY 2023; 3:421-431. [PMID: 37206883 PMCID: PMC10189723 DOI: 10.1021/acsagscitech.3c00017] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 04/05/2023] [Accepted: 04/06/2023] [Indexed: 05/21/2023]
Abstract
This study was conducted to optimize a targeted plant proteomics approach from signature peptide selection and liquid chromatography with tandem mass spectrometry (LC-MS/MS) analytical method development and optimization to sample preparation method optimization. Three typical protein extraction and precipitation methods, including trichloroacetic acid (TCA)/acetone method, phenol method, and TCA/acetone/phenol method, and two digestion methods, including trypsin digestion and LysC/trypsin digestion, were evaluated for selected proteins related to the impact of engineered nanomaterials (ENMs) on wheat (Triticum aestivum) plant growth. In addition, we compared two plant tissue homogenization methods: grinding freeze-dried tissue and fresh tissue into a fine powder using a mortar and pestle aided with liquid nitrogen. Wheat plants were grown under a 16 h photoperiod (light intensity 150 μmol·m-2·s-1) for 4 weeks at 22 °C with a relative humidity of 60% and were watered daily to maintain a 70-90% water content in the soil. Processed samples were analyzed with an optimized LC-MS/MS method. The concentration of selected signature peptides for the wheat proteins of interest indicated that the phenol extraction method using fresh plant tissue, coupled with trypsin digestion, was the best sample preparation method for the targeted proteomics study. Overall, the optimized approach yielded the highest total peptide concentration (68,831 ng/g, 2.4 times the lowest concentration) as well as higher signature peptide concentrations for most peptides (19 out of 28). In addition, three of the signature peptides could only be detected using the optimized approach. This study provides a workflow for optimizing targeted proteomics studies.
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Tuzimski T, Petruczynik A. Review of New Trends in the Analysis of Allergenic Residues in Foods and Cosmetic Products. J AOAC Int 2020; 103:997-1028. [PMID: 33241349 PMCID: PMC8370415 DOI: 10.1093/jaoacint/qsaa015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 01/03/2020] [Accepted: 01/16/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND Allergies represent an important health problem in industrialized countries. Allergen sensitization is an important risk factor for the development of allergic diseases; thus, the identification of an individual's allergen sensitization is essential for the diagnosis and treatment of diseases. OBJECTIVE This review compares different modern methods applied for the analysis of allergens in various matrices (from 2015 to the end of September 2019). CONCLUSIONS Immunological methods are still most frequently used for detection of allergens. These methods are sensitive, but the lack of specificity and cross-reaction of some antibodies can still be a relevant source of errors. DNA-based methods are fast and reliable for determination of protein allergens, but the epitopes of protein allergens with posttranslational modifications and their changes, originated during various processing, cannot be identified through the use of this method. Methods based on application of biosensors are very rapid and easy to use, and can be readily implemented as screening methods to monitor allergens. Recent developments of new high-resolution MS instruments are encouraging and enable development in the analysis of allergens. Fast, very sensitive, reliable, and accurate detection and quantification of allergens in complex samples can be used in the near future. Mass spectrometry coupled with LC, GC, or electrophoretic methods bring additional advances in allergen analysis. The use of LC-MS or LC-MS/MS for the quantitative detection of allergens in various matrices is at present gaining acceptance as a protein-based confirmatory technique over the routinely performed enzyme-linked immunosorbent assays.
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Affiliation(s)
- Tomasz Tuzimski
- Medical University of Lublin, Department of Physical Chemistry, 4A Chodzki Street, Lublin, Poland, 20-093
| | - Anna Petruczynik
- Medical University of Lublin, Department of Inorganic Chemistry, 4A Chodzki Street, Lublin, Poland, 20-093
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Shaheen N, Halima O, Akhter KT, Nuzhat N, Rao RSP, Wilson RS, Ahsan N. Proteomic characterization of low molecular weight allergens and putative allergen proteins in lentil (Lens culinaris) cultivars of Bangladesh. Food Chem 2019; 297:124936. [DOI: 10.1016/j.foodchem.2019.06.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 05/31/2019] [Accepted: 06/02/2019] [Indexed: 10/26/2022]
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Meeting the challenge of developing food crops with improved nutritional quality and food safety: leveraging proteomics and related omics techniques. Biotechnol Lett 2019; 41:471-481. [PMID: 30820711 DOI: 10.1007/s10529-019-02655-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 02/21/2019] [Indexed: 10/27/2022]
Abstract
Eliminating malnutrition remains an imminent priority in our efforts to achieve food security and providing adequate calories, proteins, and micronutrients to the growing world population. Malnutrition may be attributed to socio-economic factors (poverty and limited accessibility to nutritional food), dietary preferences, inherent nutrient profiles of traditional food crops, and to a combination of all such factors. Modern advancements in "omics" technology have made it possible to reliably predict, diagnose, and suggest ways to remedy the low protein content and bioavailability of key micronutrients in food crops. In this review, we briefly describe how proteomics techniques can potentially be used for improving the nutrient profile of major crops, through high throughput multiplexed assays. Food safety is another important issue where proteomics and related platforms can offer solution for absolute quantitation of food allergens and mycotoxins present in the plant-based food. The purpose of the present review is to discuss the proteomic-based strategies in food crops to meet the challenges of overcoming malnutrition throughout the world.
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Abstract
Among targeted proteomic techniques, AQUA-MRM is considered as one of the most reliable for accurate protein quantitation. This method displays high sensitivity, specificity, and reproducibility compared to many common biochemical techniques by coupling the use of unique, heavy-labeled peptide standards and triple-quadrupole mass spectrometry. However, there are several important steps that are required for successful development and validation of a robust AQUA-MRM assay. The following protocol outlines and details the key steps necessary for plant sample preparation as well as AQUA-MRM development and validation, specifically for absolute quantitation of plant proteins in vivo. © 2018 by John Wiley & Sons, Inc.
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Affiliation(s)
- Nagib Ahsan
- Division of Biology and Medicine, Brown University, Providence, Rhode Island.,Center for Cancer Research Development, Proteomics Core Facility, Rhode Island Hospital, Providence, Rhode Island
| | - Rashaun S Wilson
- Department of Psychiatry, Yale University School of Medicine, New Haven, Connecticut
| | - Jay J Thelen
- Department of Biochemistry, University of Missouri, Christopher S. Bond Life Sciences Center, Columbia, Missouri
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Wilson RS, Thelen JJ. In Vivo Quantitative Monitoring of Subunit Stoichiometry for Metabolic Complexes. J Proteome Res 2018; 17:1773-1783. [PMID: 29582652 DOI: 10.1021/acs.jproteome.7b00756] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Metabolic pathways often employ assemblies of individual enzymes to facilitate substrate channeling to improve thermodynamic efficiency and confer pathway directionality. It is often assumed that subunits to multienzyme complexes are coregulated and accumulate at fixed levels in vivo, reflecting complex stoichiometry. Such assumptions can be experimentally tested using modern tandem mass spectrometry, and herein we describe such an approach applied toward an important metabolic complex. The committed step of de novo fatty acid synthesis in the plastids of most plants is catalyzed by the multienzyme, heteromeric acetyl-CoA carboxylase (hetACCase). This complex is composed of four catalytic subunits and a recently discovered regulatory subunit resembling the biotin carboxyl carrier protein but lacking the biotinylation motif necessary for activity. To better understand this novel form of regulation, a targeted tandem mass-spectrometry-based assay was developed to absolutely quantify all subunits to the Arabidopsis thaliana hetACCase. After validation against pure, recombinant protein, this multiplexed assay was used to quantify hetACCase subunits in siliques in various stages of development. Quantitation provided a developmental profile of hetACCase and BADC protein expression that supports a recently proposed regulatory mechanism for hetACCase and demonstrates a promising application of targeted mass spectrometry for in vivo analysis of protein complexes.
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Affiliation(s)
- Rashaun S Wilson
- Department of Biochemistry , University of Missouri, Christopher S. Bond Life Sciences Center , Columbia , Missouri 65211 , United States
| | - Jay J Thelen
- Department of Biochemistry , University of Missouri, Christopher S. Bond Life Sciences Center , Columbia , Missouri 65211 , United States
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Rödiger A, Baginsky S. Tailored Use of Targeted Proteomics in Plant-Specific Applications. FRONTIERS IN PLANT SCIENCE 2018; 9:1204. [PMID: 30174680 PMCID: PMC6107752 DOI: 10.3389/fpls.2018.01204] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 07/26/2018] [Indexed: 05/03/2023]
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Hill RC, Wang X, Schafer BW, Gampala SS, Herman RA. Measurement of lipid transfer proteins in genetically engineered maize using liquid chromatography with tandem mass spectrometry (LC-MS/MS). GM CROPS & FOOD 2017; 8:239-252. [PMID: 28758829 DOI: 10.1080/21645698.2017.1349602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Endogenous allergenicity evaluation is a required part of the risk assessment for genetically engineered (GE) crops. Although maize is not considered a major allergenic food, a lipid transfer protein (Zea m 14) in maize grain has been identified as a potential IgE-mediated food allergen. Currently, the relationship between allergen exposure and risk of sensitization is not well understood. Hence, reliable quantitative methods are useful for determining the natural range and variability of allergen levels across multiple geographies and genetic backgrounds. A LC-MS/MS analytical method was developed and validated in our laboratory to quantify Zea m 14 in grain from 2 GE maize hybrids and 20 non-GE maize hybrids. The measured Zea m 14 levels in GE maize grain and conventional non-GE maize grain ranged from 146.87 to 574.93 ng/mg across 16 field sites located in the United States and Argentina. The method accurately quantified endogenous Zea m 14 from maize grain and results show Zea m 14 levels in the GE maize varieties were within the natural variation observed in traditionally bred non-GE maize.
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Affiliation(s)
- Ryan C Hill
- a Dow AgroSciences LLC , Indianapolis , IN , USA
| | - Xiujuan Wang
- a Dow AgroSciences LLC , Indianapolis , IN , USA
| | | | | | - Rod A Herman
- a Dow AgroSciences LLC , Indianapolis , IN , USA
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Gu X, Lee T, Geng T, Liu K, Thoma R, Crowley K, Edrington T, Ward JM, Wang Y, Flint-Garcia S, Bell E, Glenn KC. Assessment of Natural Variability of Maize Lipid Transfer Protein Using a Validated Sandwich ELISA. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:1740-1749. [PMID: 28161956 DOI: 10.1021/acs.jafc.6b03583] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Lipid transfer protein (LTP) is the main causative agent for rare food allergic reactions to maize. This paper describes a new, validated ELISA that accurately measures maize LTP concentrations from 0.2 to 6.4 ng/mL. The levels of LTP ranged from 171 to 865 μg/g of grain, a 5.1-fold difference, across a set of 49 samples of maize B73 hybrids derived from the Nested Association Mapping (NAM) founder lines and a diverse collection of landrace accessions from North and South America. A second set of 107 unique samples from 18 commercial hybrids grown over two years across 10 U.S. states showed a comparable range of LTP level (212-751 μg/g of grain). Statistical analysis showed that genetic and environmental factors contributed 63 and 6%, respectively, to the variance in LTP levels. Therefore, the natural variation of maize LTP is up to 5-fold different across a diverse collection of varieties that have a history of safe cultivation and consumption.
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Affiliation(s)
- Xin Gu
- Monsanto Company , 800 North Lindbergh Boulevard, St. Louis, Missouri 63167, United States
| | - Thomas Lee
- Monsanto Company , 800 North Lindbergh Boulevard, St. Louis, Missouri 63167, United States
| | - Tao Geng
- Monsanto Company , 800 North Lindbergh Boulevard, St. Louis, Missouri 63167, United States
| | - Kang Liu
- Monsanto Company , 800 North Lindbergh Boulevard, St. Louis, Missouri 63167, United States
| | - Richard Thoma
- Monsanto Company , 800 North Lindbergh Boulevard, St. Louis, Missouri 63167, United States
| | - Kathleen Crowley
- Vasculox , 4320 Forest Park Avenue, Suite 304, St. Louis, Missouri 63108, United States
| | - Thomas Edrington
- Monsanto Company , 800 North Lindbergh Boulevard, St. Louis, Missouri 63167, United States
| | - Jason M Ward
- Royal Canin USA , 500 Fountain Lakes Boulevard, Suite 100, St. Charles, Missouri 63301, United States
| | - Yongcheng Wang
- Monsanto Company , 800 North Lindbergh Boulevard, St. Louis, Missouri 63167, United States
| | - Sherry Flint-Garcia
- Agricultural Research Service, U.S. Department of Agriculture , Columbia, Missouri 65211, United States
- Division of Plant Sciences, University of Missouri , Columbia, Missouri 65211, United States
| | - Erin Bell
- Monsanto Company , 800 North Lindbergh Boulevard, St. Louis, Missouri 63167, United States
| | - Kevin C Glenn
- Monsanto Company , 800 North Lindbergh Boulevard, St. Louis, Missouri 63167, United States
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Mass Spectrometric-Based Selected Reaction Monitoring of Protein Phosphorylation during Symbiotic Signaling in the Model Legume, Medicago truncatula. PLoS One 2016; 11:e0155460. [PMID: 27203723 PMCID: PMC4874550 DOI: 10.1371/journal.pone.0155460] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 04/29/2016] [Indexed: 11/19/2022] Open
Abstract
Unlike the major cereal crops corn, rice, and wheat, leguminous plants such as soybean and alfalfa can meet their nitrogen requirement via endosymbiotic associations with soil bacteria. The establishment of this symbiosis is a complex process playing out over several weeks and is facilitated by the exchange of chemical signals between these partners from different kingdoms. Several plant components that are involved in this signaling pathway have been identified, but there is still a great deal of uncertainty regarding the early events in symbiotic signaling, i.e., within the first minutes and hours after the rhizobial signals (Nod factors) are perceived at the plant plasma membrane. The presence of several protein kinases in this pathway suggests a mechanism of signal transduction via posttranslational modification of proteins in which phosphate is added to the hydroxyl groups of serine, threonine and tyrosine amino acid side chains. To monitor the phosphorylation dynamics and complement our previous untargeted 'discovery' approach, we report here the results of experiments using a targeted mass spectrometric technique, Selected Reaction Monitoring (SRM) that enables the quantification of phosphorylation targets with great sensitivity and precision. Using this approach, we confirm a rapid change in the level of phosphorylation in 4 phosphosites of at least 4 plant phosphoproteins that have not been previously characterized. This detailed analysis reveals aspects of the symbiotic signaling mechanism in legumes that, in the long term, will inform efforts to engineer this nitrogen-fixing symbiosis in important non-legume crops such as rice, wheat and corn.
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Ahsan N, Rao RSP, Gruppuso PA, Ramratnam B, Salomon AR. Targeted proteomics: Current status and future perspectives for quantification of food allergens. J Proteomics 2016; 143:15-23. [PMID: 27113134 DOI: 10.1016/j.jprot.2016.04.018] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 04/06/2016] [Accepted: 04/18/2016] [Indexed: 11/28/2022]
Abstract
UNLABELLED Allergen levels in fresh and processed foods can vary dynamically. As different sources of foods can cause different types of allergic reactions, the food industry and regulatory bodies urgently require reliable detection and absolute quantitation methods for allergen detection in complex food products to effectively safeguard the food-allergic population. Recent advances of targeted proteomic technologies namely multiple-reaction monitoring (MRM) mass spectrometry (MS) coupled with isotope-labeled internal standard, also known as AQUA peptides offers absolute quantitation of food allergens even at 10ppb level in a multiplex fashion. However, development of successful AQUA-MRM assay relies on a number of pre and post MS criteria. In this review, we briefly describe how allergen levels could potentially change in plant and animal based foods, necessitating the development of a high throughput multiplexed allergen quantification methodology for successful AQUA-MRM assay. We also propose some future strategies that could provide better management of food allergy. BIOLOGICAL SIGNIFICANCE Given the rapid increases of food allergenicity, it has become imperative to know absolute allergen levels in foods. This essential information could be the most effective means of protecting humans suffering from allergies. In this review, we emphasize the significance of the absolute quantitation of food allergens using AQUA-MRM approach and discuss the likely critical steps for successful assay development.
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Affiliation(s)
- Nagib Ahsan
- Division of Biology and Medicine, Alpert Medical School, Brown University, Providence, RI 02903, USA; Center for Cancer Research and Development, Proteomics Core Facility, Rhode Island Hospital, Providence, RI 02903, USA.
| | - R Shyama Prasad Rao
- Biostatistics and Bioinformatics Division, Yenepoya Research Center, Yenepoya University, Mangalore 575018, India
| | - Philip A Gruppuso
- Department of Pediatrics, Rhode Island Hospital, Brown University, Providence, RI 02903, USA; Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI 02903, USA
| | - Bharat Ramratnam
- Division of Biology and Medicine, Alpert Medical School, Brown University, Providence, RI 02903, USA; Center for Cancer Research and Development, Proteomics Core Facility, Rhode Island Hospital, Providence, RI 02903, USA
| | - Arthur R Salomon
- Center for Cancer Research and Development, Proteomics Core Facility, Rhode Island Hospital, Providence, RI 02903, USA; Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI 02903, USA
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de Bang TC, Petersen J, Pedas PR, Rogowska-Wrzesinska A, Jensen ON, Schjoerring JK, Jensen PE, Thelen JJ, Husted S. A laser ablation ICP-MS based method for multiplexed immunoblot analysis: applications to manganese-dependent protein dynamics of photosystem II in barley (Hordeum vulgare L.). THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2015; 83:555-565. [PMID: 26095749 DOI: 10.1111/tpj.12906] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 06/04/2015] [Indexed: 06/04/2023]
Abstract
Manganese (Mn) constitutes an essential co-factor in the oxygen-evolving complex of photosystem II (PSII). Consequently, Mn deficiency reduces photosynthetic efficiency and leads to changes in PSII composition. In order to study these changes, multiplexed protein assays are advantageous. Here, we developed a multiplexed antibody-based assay and analysed selected PSII subunits in barley (Hordeum vulgare L.). A selection of antibodies were labelled with specific lanthanides and immunoreacted with thylakoids exposed to Mn deficiency after western blotting. Subsequently, western blot membranes were analysed by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), which allowed selective and relative quantitative analysis via the different lanthanides. The method was evaluated against established liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) methods, based on data-dependent acquisition (DDA) and selected reaction monitoring (SRM). Manganese deficiency resulted in a general decrease in PSII protein abundances, an effect that was shown to be reversible upon Mn re-supplementation. Specifically, the extrinsic proteins PsbP and PsbQ showed Mn-dependent changes in abundances. Similar trends in the response to Mn deficiency at the protein level were observed when comparing DDA, SRM and LA-ICP-MS results. A biologically important exception to this trend was the loss of PsbO in the SRM analysis, which highlights the necessity of validating protein changes by more than one technique. The developed method enables a higher number of proteins to be multiplexed in comparison to existing immunoassays. Furthermore, multiplexed protein analysis by LA-ICP-MS provides an analytical platform with high throughput appropriate for screening large collections of plants.
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Affiliation(s)
- Thomas Christian de Bang
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark
| | - Jørgen Petersen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230, Odense M, Denmark, Denmark
| | - Pai Rosager Pedas
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark
| | - Adelina Rogowska-Wrzesinska
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230, Odense M, Denmark, Denmark
| | - Ole Noerregaard Jensen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230, Odense M, Denmark, Denmark
| | - Jan Kofod Schjoerring
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark
| | - Poul Erik Jensen
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark
| | - Jay J Thelen
- Christopher S. Bond Life Sciences Center, University of Missouri, 1201 Rollins St., Columbia, MO 65211, USA
| | - Søren Husted
- Department of Plant and Environmental Sciences, Copenhagen Plant Science Centre, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark
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