1
|
Wang Y, Gao Y, Duan Y, Wu X, Huang P, Shui T, Xi J. Localization and identification of denatured antigenic sites of glycinin A3 subunit after using two processing technologies. Food Res Int 2023; 171:113082. [PMID: 37330838 DOI: 10.1016/j.foodres.2023.113082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 05/31/2023] [Accepted: 06/01/2023] [Indexed: 06/19/2023]
Abstract
Glycinin is an important allergen in soybeans. In this study, molecular cloning and recombinant phage construction were performed to explore the antigenic sites of the glycinin A3 subunit that were denatured during processing. Next, the A-1-a fragment was located as the denatured antigenic sites by indirect ELISA. The combined UHP heat treatment showed better denaturation of this subunit than the single heat treatment assay. In addition, identification of the synthetic peptide showed that the A-1-a fragment was an amino acid sequence containing a conformational and linear IgE site, in which the first synthetic peptide (P1) being both an antigenic and allergenic site. The results of alanine-scanning showed that the key amino acids affecting antigenicity and allergenicity of A3 subunit were S28, K29, E32, L35 and N13. Our results could provide the basis for further development of more efficient methods to reduce the allergenicity of soybeans.
Collapse
Affiliation(s)
- Yichao Wang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Yida Gao
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Yuying Duan
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Xiao Wu
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Pengbo Huang
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Tianjiao Shui
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - Jun Xi
- College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan, China.
| |
Collapse
|
2
|
Geng Q, Zhang Y, Song M, Zhou X, Tang Y, Wu Z, Chen H. Allergenicity of peanut allergens and its dependence on the structure. Compr Rev Food Sci Food Saf 2023; 22:1058-1081. [PMID: 36624611 DOI: 10.1111/1541-4337.13101] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 12/13/2022] [Accepted: 12/18/2022] [Indexed: 01/11/2023]
Abstract
Food allergies are a global food safety problem. Peanut allergies are common due, in part, to their popular utilization in the food industry. Peanut allergy is typically an immunoglobulin E-mediated reaction, and peanuts contain 17 allergens belonging to different families in peanut. In this review, we first introduce the mechanisms and management of peanut allergy, followed by the basic structures of associated allergens. Subsequently, we summarize methods of epitope localization for peanut allergens. These methods can be instrumental in speeding up the discovery of allergenicity-dependent structures. Many attempts have been made to decrease the allergenicity of peanuts. The structures of hypoallergens, which are manufactured during processing, were analyzed to strengthen the desensitization process and allergen immunotherapy. The identification of conformational epitopes is the bottleneck in both peanut and food allergies. Further, the identification and modification of such epitopes will lead to improved strategies for managing and preventing peanut allergy. Combining traditional wet chemistry research with structure simulation studies will help in the epitopes' localization.
Collapse
Affiliation(s)
- Qin Geng
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
- College of Food Science and Technology, Nanchang University, Nanchang, China
| | - Ying Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
- College of Food Science and Technology, Nanchang University, Nanchang, China
| | - Min Song
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
- College of Food Science and Technology, Nanchang University, Nanchang, China
| | - Xiaoya Zhou
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
- College of Food Science and Technology, Nanchang University, Nanchang, China
| | - Yu Tang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
- College of Food Science and Technology, Nanchang University, Nanchang, China
| | - Zhihua Wu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
- Sino-German Joint Research Institute, Nanchang University, Nanchang, China
| | - Hongbing Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
- Sino-German Joint Research Institute, Nanchang University, Nanchang, China
| |
Collapse
|
3
|
Zhou X, Ren L, Zhang Y, Zhang J, Li X, Yang A, Tong P, Wu Z, Chen H. Effect of Structural Targeted Modifications on the Potential Allergenicity of Peanut Allergen Ara h 2. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:836-845. [PMID: 36574959 DOI: 10.1021/acs.jafc.2c06359] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Protein structure affects allergenicity, and critical structural elements, especially conformational epitopes that determine allergenicity, have attracted a great deal of interest. In this study, we aimed to identify the localized structure that affects the potential allergenicity of protein by making targeted modifications of Ara h 2 and comparing the structure and allergenicity of mutants with those of the wide-type allergen. The structures of the allergen and its mutants were characterized by circular dichroism and ultraviolet absorption spectroscopy and simulated by molecular dynamics. The allergenicity was assessed by Western blotting, an indirect competitive enzyme-linked immunosorbent assay, a cell model, and a mouse model. Then, the structures that affect allergenicity were analyzed and screened. Our results showed that mutations in amino acids changed the nearby localized structure and the overall structures. The structural changes affected the IgE binding capacity of the allergen and reduced its potential allergenicity. The solvent accessible surface area (SASA) of aromatic residues was positively correlated with the IgE binding capacity. The integrity of the disulfide bond is also critical for the binding of IgE to allergens. Interestingly, different mutations induced similar electrostatic potential and allergenicity changes, such as localized structure R62DPYSPSQDPYSPS75. In conclusion, the disulfide bond and the SASA of aromatic residues are important for the allergenicity of Ara h 2. The localized structure R62DPYSPSQDPYSPS75 is also crucial for the allergenicity of Ara h 2.
Collapse
Affiliation(s)
- Xiaoya Zhou
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
- College of Food Science and Technology, Nanchang University, Nanchang 330031, China
| | - Linmei Ren
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
- College of Food Science and Technology, Nanchang University, Nanchang 330031, China
| | - Ying Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
- College of Food Science and Technology, Nanchang University, Nanchang 330031, China
| | - Jie Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
- Laboratory Animal Technology Center, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, China
| | - Xin Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
- College of Food Science and Technology, Nanchang University, Nanchang 330031, China
| | - Anshu Yang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
- Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
| | - Ping Tong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
- College of Food Science and Technology, Nanchang University, Nanchang 330031, China
| | - Zhihua Wu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
- Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
| | - Hongbing Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
- Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, China
| |
Collapse
|
4
|
Arif M, Ahmad R, Sharaf M, Muhammad J, Abdalla M, Eltayb WA, Liu CG. Antibacterial and antibiofilm activity of mannose-modified chitosan/PMLA nanoparticles against multidrug-resistant Helicobacter pylori. Int J Biol Macromol 2022; 223:418-432. [PMID: 36356866 DOI: 10.1016/j.ijbiomac.2022.10.265] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 10/26/2022] [Accepted: 10/30/2022] [Indexed: 11/09/2022]
Abstract
Because of the apparent stasis in antibiotic discoveries and the growth of multidrug resistance, Helicobacter pylori-associated gastric infections are difficult to eradicate. In the search for alternative therapy, the reductive amination of chitosan with mannose, followed by ionic gelation, produced mannose functionalized chitosan nanoparticles. Then, molecular docking and molecular dynamics (MD) simulations were conducted with H. pylori lectin (HPLectin) as a target protein involved in bacterium adherence to host cells, biofilm formation, and cytotoxicity. Changes in zeta potential and FTIR spectroscopy revealed that chitosan was functionalized with mannose. Time-kill, polystyrene adherence, and antibiofilm studies were utilized to assess nanoparticles as an alternative antibacterial treatment against a resistant gastric pathogen. Man-CS-Nps were discovered to have effective anti-adherence and biofilm disruption characteristics in suppressing the development of resistant H. pylori. In addition, bioimaging studies with CLSM, TEM, and SEM illustrated that Man-CS-Nps interacted with bacterial cells and induced membrane disruption by creating holes in the outer membranes of the bacterial cells, resulting in the leakage of amino acids. Importantly, molecular docking and 20 ns MD simulations revealed that Man-CS-Nps inhibited the target protein through slow-binding inhibition and hydrogen bond interactions with active site residues. As a consequence of the findings of this study, the Man-CS-Nps is an excellent candidate for developing alternative therapies for the increasing incidences of resistant gastric infections.
Collapse
Affiliation(s)
- Muhammad Arif
- College of Marine Life Science, Ocean University of China, No.5 Yushan Road, Qingdao 266003, PR China
| | - Rafiq Ahmad
- Department of Microbiology, The University of Haripur, Haripur 22610, Pakistan
| | - Mohamed Sharaf
- Department of Biochemistry, Faculty of Agriculture, Al-Azhar University, Nasr City, Cairo 11751, Egypt
| | - Javed Muhammad
- Department of Microbiology, The University of Haripur, Haripur 22610, Pakistan
| | - Mohnad Abdalla
- Key Laboratory of Chemical Biology (Ministry of Education), Department of Pharmaceutics, School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, 44 Cultural West Road, Shandong Province, 250012, PR China.
| | - Wafa Ali Eltayb
- Biotechnology Department, Faculty of Science and Technology, Shendi University, Shendi, Nher Anile, Sudan
| | - Chen-Guang Liu
- College of Marine Life Science, Ocean University of China, No.5 Yushan Road, Qingdao 266003, PR China.
| |
Collapse
|
5
|
Sarkar C, Abdalla M, Mondal M, Khalipha ABR, Ali N. Ebselen suitably interacts with the potential SARS-CoV-2 targets: an in-silico approach. J Biomol Struct Dyn 2022; 40:12286-12301. [PMID: 34459720 DOI: 10.1080/07391102.2021.1971562] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Ebselen (SPI-1005) is an active selenoorganic compound that can be found potential inhibitory activity against different types of viral infections such as zika virus, influenza A virus, HCV, and HIV-1; and also be found to exhibit promising antiviral activity against SARS-CoV-2 in cell-based assays but its particular target action against specific non-structural and structural proteins of SARS-CoV-2 is unclear to date. The purpose of this study is to evaluate the anti-SARS-CoV-2 efficacy of Ebselen along with the determination of the specific target among the 12 most common target proteins of SARS-CoV-2. AutoDock Vina in PyRx platform was used for docking analysis against the 12 selected SARS-CoV-2 encoded drug targets. ADME profiling was examined by using SwissADME online server. The stability of binding mode in the target active sites was evaluated using molecular dynamics (MD) simulation studies through NAMD and Desmond package software application. In this docking study, we recognized that Ebselen possesses the highest affinity to N protein (C domain) (PDB ID: 6YUN) and PLpro (PDB ID: 6WUU) among the selected SARS-CoV-2 targets showing -7.4 kcal/mol binding energy. The stability of Ebselen-6YUN and Ebselen-6WUU was determined by a 100 ns trajectory of all-atom molecular dynamics simulation. Structural conformation of these two complexes displayed stable root mean square deviation (RMSD), while root mean square fluctuations (RMSF) were also found to be consistent. This molecular docking study may propose the efficiency of Ebselen against SARS-CoV-2 to a significant extent which makes it a candidature of COVID-19 treatment.
Collapse
Affiliation(s)
- Chandan Sarkar
- Department of Pharmacy, Life Science Faculty, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj, Bangladesh
| | - Mohnad Abdalla
- Key Laboratory of Chemical Biology (Ministry of Education), Department of Pharmaceutics, School of Pharmaceutical Sciences, Cheeloo College of Medicine, Shandong University, Shandong Province, PR China
| | - Milon Mondal
- Department of Pharmacy, Life Science Faculty, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj, Bangladesh
| | - Abul Bashar Ripon Khalipha
- Department of Pharmacy, Life Science Faculty, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj, Bangladesh
| | - Nasir Ali
- CAS Key Laboratory of Biofuels and Shandong Provincial Key Laboratory of Synthetic Biology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Shandong, China
| |
Collapse
|
6
|
Đukić T, Smiljanić K, Mihailović J, Prodić I, Apostolović D, Liu SH, Epstein MM, van Hage M, Stanić-Vučinić D, Ćirković Veličković T. Proteomic Profiling of Major Peanut Allergens and Their Post-Translational Modifications Affected by Roasting. Foods 2022; 11:foods11243993. [PMID: 36553735 PMCID: PMC9778155 DOI: 10.3390/foods11243993] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 12/02/2022] [Accepted: 12/06/2022] [Indexed: 12/14/2022] Open
Abstract
Post-translational modifications (PTMs) are covalent changes occurring on amino acid side chains of proteins and yet are neglected structural and functional aspects of protein architecture. The objective was to detect differences in PTM profiles that take place after roasting using open PTM search. We conducted a bottom-up proteomic study to investigate the impact of peanut roasting on readily soluble allergens and their PTM profiles. Proteomic PTM profiling of certain modifications was confirmed by Western blotting with a series of PTM-specific antibodies. In addition to inducing protein aggregation and denaturation, roasting may facilitate change in their PTM pattern and relative profiling. We have shown that Ara h 1 is the most modified major allergen in both samples in terms of modification versatility and extent. The most frequent PTM was methionine oxidation, especially in roasted samples. PTMs uniquely found in roasted samples were hydroxylation (Trp), formylation (Arg/Lys), and oxidation or hydroxylation (Asn). Raw and roasted peanut extracts did not differ in the binding of IgE from the serum of peanut-sensitised individuals done by ELISA. This study provides a better understanding of how roasting impacts the PTM profile of major peanut allergens and provides a good foundation for further exploration of PTMs.
Collapse
Affiliation(s)
- Teodora Đukić
- University of Belgrade—Faculty of Chemistry, Department of Biochemistry and Centre of Excellence for Molecular Food Sciences, Studentski Trg 12–16, 11000 Belgrade, Serbia
| | - Katarina Smiljanić
- University of Belgrade—Faculty of Chemistry, Department of Biochemistry and Centre of Excellence for Molecular Food Sciences, Studentski Trg 12–16, 11000 Belgrade, Serbia
| | - Jelena Mihailović
- University of Belgrade—Faculty of Chemistry, Department of Biochemistry and Centre of Excellence for Molecular Food Sciences, Studentski Trg 12–16, 11000 Belgrade, Serbia
| | - Ivana Prodić
- University of Belgrade—Faculty of Chemistry, Innovation Center Ltd., Studentski Trg 12-16, 11000 Belgrade, Serbia
| | - Danijela Apostolović
- Department of Medicine Solna, Division of Immunology and Allergy, Karolinska Institutet and Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | - Shu-Hua Liu
- Medical University of Vienna Department of Dermatology, Experimental Allergy Laboratory, Waehringer Guertel 18–20, 1090 Vienna, Austria
| | - Michelle M. Epstein
- Medical University of Vienna Department of Dermatology, Experimental Allergy Laboratory, Waehringer Guertel 18–20, 1090 Vienna, Austria
| | - Marianne van Hage
- Department of Medicine Solna, Division of Immunology and Allergy, Karolinska Institutet and Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | - Dragana Stanić-Vučinić
- University of Belgrade—Faculty of Chemistry, Department of Biochemistry and Centre of Excellence for Molecular Food Sciences, Studentski Trg 12–16, 11000 Belgrade, Serbia
| | - Tanja Ćirković Veličković
- University of Belgrade—Faculty of Chemistry, Department of Biochemistry and Centre of Excellence for Molecular Food Sciences, Studentski Trg 12–16, 11000 Belgrade, Serbia
- Ghent University Global Campus, Incheon 406-840, Korea
- Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
- Serbian Academy of Sciences and Arts, Kneza Mihaila 35, 1100 Belgrade, Serbia
- Correspondence: or ; Tel.: +38-11-1333-6608
| |
Collapse
|
7
|
Sharma A, Vashisht S, Mishra R, Gaur SN, Prasad N, Lavasa S, Batra JK, Arora N. Molecular and immunological characterization of cysteine protease from Phaseolus vulgaris and evolutionary cross-reactivity. J Food Biochem 2022; 46:e14232. [PMID: 35592951 DOI: 10.1111/jfbc.14232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 04/17/2022] [Accepted: 04/21/2022] [Indexed: 11/29/2022]
Abstract
A commonly consumed legume in India, the kidney bean (Phaseolus vulgaris) is associated with allergy. We report molecular and immunological characterization of cysteine protease allergen and its cross-reactivity. In silico allergenicity assessment and phylogenetic analysis of kidney bean cysteine protease showed significant sequence homology (upto 67%) with allergens from kiwi, papaya, soybean, ragweed pollen and mites. Physicochemical properties and motif-analysis depicted cysteine protease as probable allergen. Multiple sequence alignment and phylogenetic analysis indicated structural conservation between kidney bean and homologous cysteine protease sequences. The gene was cloned, expressed and affinity purified. Cysteine protease was resolved at 42 kDa and exhibited high IgE binding (up to 89%) with hypersensitive sera. Cysteine protease showed functional property on cross-linking IgE receptors and upregulated expression of CD203c on activated basophils. In inhibition studies, 8.4 ng of cysteine protease was required for 50% self-inhibition, whereas significant inhibition was also observed with kidney bean (52 ng), black gram (155 ng), chick pea (437 ng), mesquite pollen (36 ng), house dust mite (64.85 ng), Alternaria alternata (78.8 ng) and Curvularia lunata (73.6 ng) extracts. ConSurf analysis indicated conserved active site and catalytic residues in mature domain among proteases from legumes, fruits, pollens, mites and fungus. In summary, P. vulgaris cysteine protease was molecularly characterized having functional activity. This study demonstrated, cross-reactivity between food and aeroallergens based on evolutionary conservancy that showed its clinical importance as cross-reactive allergen. PRACTICAL APPLICATIONS: Adaptation of sustainable lifestyle has led to a surge in consumption of plant-based foods especially legumes. Their high nutritional content lowers the risk of developing cardiovascular diseases, diabetes, obesity, and stroke. Kidney beans, a commonly consumed legume in Indian subcontinent, have a potential to be used as nutraceutical and functional food. Despite its alimentary nature, it elicits allergic reactions. Being a major sensitizer, trivial information regarding its allergic components has led to an urgent need for exploring its allergen repertoire. Our study reported biochemical and immunological characterization of its major cysteine protease allergen. Cysteine proteases are major cross-reactive allergens from insects, fruits and fungal sources. Identification and molecular characterization of such immunodominant allergens by RDT offers the prospect of using recombinant proteins for accurate diagnosis and therapeutic purposes. This study suggests that a potential major cross-reactive allergen may aid in developing allergy management interventions for a wide range of allergenic sources.
Collapse
Affiliation(s)
- Akansha Sharma
- Allergy and Immunology Section, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India.,Department of Biochemistry, School of Chemical and Life Sciences, Jamia Hamdard, New Delhi, India
| | - Srishti Vashisht
- Allergy and Immunology Section, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
| | - Richa Mishra
- Allergy and Immunology Section, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India.,Academy of Scientific and Innovative Research, Ghaziabad, India
| | - Shailendra Nath Gaur
- Department of Respiratory Medicine, Vallabhbhai Patel Chest Institute, University of Delhi, New Delhi, India
| | | | | | - Janendra Kumar Batra
- Department of Biochemistry, School of Chemical and Life Sciences, Jamia Hamdard, New Delhi, India
| | - Naveen Arora
- Allergy and Immunology Section, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
| |
Collapse
|
8
|
Sharaf M, Arif M, Hamouda HI, Khan S, Abdalla M, Shabana S, Rozan HE, Khan TU, Chi Z, Liu C. Preparation, urease inhibition mechanisms, and anti- Helicobacter pylori activities of hesperetin-7-rhamnoglucoside. CURRENT RESEARCH IN MICROBIAL SCIENCES 2021; 3:100103. [PMID: 35024644 PMCID: PMC8732090 DOI: 10.1016/j.crmicr.2021.100103] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
This work investigated the effects of the bioflavonoid hesperetin-7-rhamnoglucoside isolated from Citrus uranium fruit peel on Helicobacter pylori (H. pylori). Separation and purity, crystalline state, and urease inhibition assays were carried out. Then, molecular docking and molecular dynamics (MD) simulations were conducted with urease as the target protein. Hesp was isolated from citrus peel with a purity of 95.14 µg mg-1 of dry raw material. X-ray diffraction analysis, hydrogen-1 nuclear magnetic resonance, Fourier transform infrared spectroscopy, and differential scanning calorimetry revealed that pure Hesp had the same crystallinity rating as the Hesp standard. The kinetic inhibition study demonstrated that Hesp inhibited H. pylori urease in a competitive and concentration-dependent manner with jack bean urease. In addition, bioimaging studies with laser scanning confocal microscopy and scanning electron microscopy illustrated that Hesp interacted with bacterial cells and induced membrane disruption by creating holes in the outer membranes of the bacterial cells, resulting in the leakage of amino acids. Importantly, molecular docking and 20 ns MD simulations revealed that Hesp inhibited the target protein through slow-binding inhibition and hydrogen bond interactions with active site residues, namely, Gly11 (O⋯H distance = 2.2 Å), Gly13 (O⋯H distance = 2.4 Å), Ser12 (O⋯H distance = 3.3 Å), Lys14 (O⋯H distance = 3.3 Å), and Arg179 (O⋯H distance = 2.7 Å). This work presents novel anti- H. pylori agents from natural sources.
Collapse
Affiliation(s)
- Mohamed Sharaf
- Department of Biochemistry and Molecular Biology, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, PR China
- Department of Biochemistry, Faculty of Agriculture, Al-Azhar University, Nasr City, Cairo, 11751, Egypt
| | - Muhammad Arif
- Department of Biochemistry and Molecular Biology, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, PR China
| | - Hamed I. Hamouda
- College of Food Science and Engineering, Ocean University of China, Qingdao, 266003, China
- Processes Design and Development Department, Egyptian Petroleum Research Institute, Nasr City, 11727, Cairo, Egypt
- University of Chinese Academy of Sciences, Beijing, 100039, China
| | - Sohaib Khan
- Department of Biochemistry and Molecular Biology, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, PR China
| | - Mohnad Abdalla
- Key Laboratory of Chemical Biology (Ministry of Education), Department of Pharmaceutics, School of Pharmaceutical Sciences, College of Medicine, Shandong University, 44 Cultural West Road, Shandong Province, 250012, PR China
| | - Samah Shabana
- Department of Biochemistry and Molecular Biology, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, PR China
| | - Hussein. E. Rozan
- Department of Biochemistry and Molecular Biology, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, PR China
- Department of Biochemistry, Faculty of Agriculture, Al-Azhar University, Nasr City, Cairo, 11751, Egypt
| | - Tehsin Ullah Khan
- Department of Biochemistry and Molecular Biology, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, PR China
| | - Zhe Chi
- Department of Biochemistry and Molecular Biology, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, PR China
| | - Chenguang Liu
- Department of Biochemistry and Molecular Biology, College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, PR China
| |
Collapse
|
9
|
|
10
|
Sharma S, Vashisht S, Gaur SN, Lavasa S, Arora N. Identification of B cell epitopes of Per a 5 allergen using bioinformatic approach. Immunobiology 2021; 226:152146. [PMID: 34717182 DOI: 10.1016/j.imbio.2021.152146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 09/10/2021] [Accepted: 10/07/2021] [Indexed: 11/20/2022]
Abstract
BACKGROUND Immune epitopes of allergens are pivotal for development of novel diagnostic and therapeutic modalities. Present study aims to identify antigenic determinants of Per a 5, a clinically relevant cross reactive cockroach allergen. METHODS The three dimensional structure of Per a 5 was modelled using Modeller 9v11 software. A combination of sequence and structure based computational tools were employed for predicting B cell epitopes. Epitopes were synthesized and immunoreactivity was assessed by ELISA using cockroach hypersensitive patient's sera. Cross-reactivity potential of predicted epitopes was assessed with SDAP and ConSurf and validated by IgE ELISA with fungal and mite hypersensitive patient's sera. RESULTS Per a 5 structure exhibited good quality factor in ERRAT and high stereochemical stability. In silico analysis revealed six B cell epitopes (BC-P1 to P6). BC-P3 demonstrated significant IgE binding followed by BC-P2 and BC-P1 with cockroach hypersensitive patient's sera. Per a 5 epitopes demonstrate considerable similarity with broad spectrum of allergens from fungal, mites, helminths, fruits and nuts. Analysis of PD values indicate BC-P4 to be well conserved among dust mite and helminth GSTs (8.89, 10.63 and 10.69 with D. pteronyssinus, W. bancrofti and F. hepatica respectively). ConSurf analysis of Per a 5 revealed specific enrichment of evolutionarily similar amino acid residues in BC-P2 (with fungal and mite GSTs) and BC-P4 (with mite and helminth GSTs). Further, IgE binding analysis of epitopes demonstrate BC-P2, BC-P3 and BC-P5 as high IgE binders in fungal hypersensitive sera while BC-P1, BC-P2, BC-P4 and BC-P5 demonstrated significant IgE binding with mite hypersensitive sera. CONCLUSIONS Among the predicted epitopes, BC-P3 demonstrates maximal IgE binding ability. Computational analysis suggests strong evolutionary conservation and cross reactive potential of BC-P4 with allergens in dust mite and helminths. ELISA highlights predictive potential of analysing evolutionarily conserved residues for uncovering potentially cross reactive antigenic determinants. GENERAL SIGNIFICANCE Immune epitopes of Per a 5 were identified for aiding molecular diagnosis and potential cross reactivity.
Collapse
Affiliation(s)
- Swati Sharma
- Allergy and Immunology Section, CSIR-Institute of Genomics and Integrative Biology, New Delhi 110007, India; Academy of Scientific and Innovative Research, Ghaziabad, U.P., 201002, India
| | - Srishti Vashisht
- Allergy and Immunology Section, CSIR-Institute of Genomics and Integrative Biology, New Delhi 110007, India
| | - S N Gaur
- Department of Pulmonary Medicine, V.P. Chest Institute, University of Delhi, New Delhi 110007, India
| | | | - Naveen Arora
- Allergy and Immunology Section, CSIR-Institute of Genomics and Integrative Biology, New Delhi 110007, India; Academy of Scientific and Innovative Research, Ghaziabad, U.P., 201002, India
| |
Collapse
|
11
|
Apostolovic D, Marsh JT, Baumert J, Taylor SL, Westphal A, de Jongh H, Johnson P, de Jong GAH, Koppelman SJ. Purification and Initial Characterization of Ara h 7, a Peanut Allergen from the 2S Albumin Protein Family. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:6318-6329. [PMID: 34037388 DOI: 10.1021/acs.jafc.1c00618] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
2S albumins are important peanut allergens. Within this protein family, Ara h 2 and Ara h 6 have been described in detail, but Ara h 7 has received little attention. We now describe the first purification of Ara h 7 and its characterization. Two Ara h 7 isoforms were purified from peanuts. Mass spectrometry revealed that both the isoforms have a post-translation cleavage, a hydroxyproline modification near the N-terminus, and four disulfide bonds. The secondary structure of both Ara h 7 isoforms is highly comparable to those of Ara h 2 and Ara h 6. Both Ara h 7 isoforms bind IgE, and Ara h 7 is capable of inhibiting the binding between Ara h 2 and IgE, suggesting at least partially cross-reactive IgE epitopes. Ara h 7 was found in all main market types of peanut, at comparable levels. This suggests that Ara h 7 is a relevant allergen from the peanut 2S albumin protein family.
Collapse
Affiliation(s)
- Danijela Apostolovic
- Immunology and Allergy Division, Department of Medicine Solna, Karolinska Institutet, Solnavägen 1, 171 77 Solna, Sweden
| | - Justin T Marsh
- Food Allergy Research and Resource Program, Department of Food Science & Technology, University of Nebraska, 279 Food Innovation Center, Lincoln, Nebraska 68588-6207, United States
| | - Joe Baumert
- Food Allergy Research and Resource Program, Department of Food Science & Technology, University of Nebraska, 279 Food Innovation Center, Lincoln, Nebraska 68588-6207, United States
| | - Steve L Taylor
- Food Allergy Research and Resource Program, Department of Food Science & Technology, University of Nebraska, 279 Food Innovation Center, Lincoln, Nebraska 68588-6207, United States
| | - Adrie Westphal
- Biochemistry Dept., Wageningen University and Research, PO Box 17, 6700 AA Wageningen, The Netherlands
| | - Harmen de Jongh
- ProtinConsult, Rozenstraat 19, 3702 VL Zeist, The Netherlands
| | - Phil Johnson
- Food Allergy Research and Resource Program, Department of Food Science & Technology, University of Nebraska, 279 Food Innovation Center, Lincoln, Nebraska 68588-6207, United States
| | - Govardus A H de Jong
- Wageningen University and Research, Food and Biobased Research. PO Box 17, 6700 AA Wageningen, The Netherlands
| | - Stef J Koppelman
- Food Allergy Research and Resource Program, Department of Food Science & Technology, University of Nebraska, 279 Food Innovation Center, Lincoln, Nebraska 68588-6207, United States
| |
Collapse
|
12
|
Mishra A, Kumar A. Mapping B-Cell Epitopes for Nonspecific Lipid Transfer Proteins of Legumes Consumed in India and Identification of Critical Residues Responsible for IgE Binding. Foods 2021; 10:foods10061269. [PMID: 34199581 PMCID: PMC8227083 DOI: 10.3390/foods10061269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/15/2021] [Accepted: 04/19/2021] [Indexed: 12/26/2022] Open
Abstract
Nonspecific lipid transfer proteins (nsLTPs) have been categorized as panallergens and display widespread occurrence across plant-kingdom. Present study, investigated B-cell epitopes for LTPs from chickpea, mung-bean, cowpea, pigeon-pea, and soybean via in silico methods. In-silico predicted regions were evaluated for epitope-conservancy and property-based peptide similarity search by different allergen databases. Additionally, the in-silico predicted regions were compared with the experimentally validated epitopes of peach-LTP. Sequence-homology studies showed that chickpea and mung-bean LTPs shared significant homology, i.e., >70% and >60%, respectively, with other LTP allergens from lentil, garden-pea, peanut, etc. Phylogenetic-analysis also showed chickpea and mung-bean LTPs to be closely related to allergenic LTPs from lentil and peanut, respectively. Epitope-conservation analysis showed that two of the predicted B-cell epitopic regions in chickpea and mung-bean LTPs were also conserved in other allergenic LTPs from peach, peanut, garden-pea, lentil, and green-bean, and might serve as conserved B-cell epitopes of the LTP protein family. Property-distance index values for chickpea and mung-bean LTPs also showed that most of the epitopes shared similarity with the reported allergens like-lentil, peanut, apple, plum, tomato, etc. Present findings, may be explored for identification of probable allergenicity of novel LTPs, on the basis of the reported conserved B-cell epitopes, responsible for potential cross-reactivity.
Collapse
Affiliation(s)
- Ankita Mishra
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur 208016, UP, India;
- Correspondence:
| | - Ashok Kumar
- Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur 208016, UP, India;
- Centre for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, UP, India
- Centre for Nanosciences, Indian Institute of Technology Kanpur, Kanpur 208016, UP, India
- The Mehta Family Centre for Engineering in Medicine, Indian Institute of Technology Kanpur, Kanpur 208016, UP, India
| |
Collapse
|
13
|
Behbahani M, Rabiei P, Mohabatkar H. A Comparative Analysis of Allergen Proteins between Plants and Animals Using Several Computational Tools and Chou's PseAAC Concept. Int Arch Allergy Immunol 2020; 181:813-821. [PMID: 32906141 DOI: 10.1159/000509084] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Accepted: 05/29/2020] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND A large number of allergens are derived from plant and animal proteins. A major challenge for researchers is to study the possible allergenic properties of proteins. The aim of this study was in silico analysis and comparison of several physiochemical and structural features of plant- and animal-derived allergen proteins, as well as classifying these proteins based on Chou's pseudo-amino acid composition (PseAAC) concept combined with bioinformatics algorithms. METHODS The physiochemical properties and secondary structure of plant and animal allergens were studied. The classification of the sequences was done using the PseAAC concept incorporated with the deep learning algorithm. Conserved motifs of plant and animal proteins were discovered using the MEME tool. B-cell and T-cell epitopes of the proteins were predicted in conserved motifs. Allergenicity and amino acid composition of epitopes were also analyzed via bioinformatics servers. RESULTS In comparison of physiochemical features of animal and plant allergens, extinction coefficient was different significantly. Secondary structure prediction showed more random coiled structure in plant allergen proteins compared with animal proteins. Classification of proteins based on PseAAC achieved 88.24% accuracy. The amino acid composition study of predicted B- and T-cell epitopes revealed more aliphatic index in plant-derived epitopes. CONCLUSIONS The results indicated that bioinformatics-based studies could be useful in comparing plant and animal allergens.
Collapse
Affiliation(s)
- Mandana Behbahani
- Department of Biotechnology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | - Parisa Rabiei
- Department of Biotechnology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | - Hassan Mohabatkar
- Department of Biotechnology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran,
| |
Collapse
|
14
|
Xi J, He M. Location of destroyed antigenic sites of Gly m Bd 60 K after three processing technologies. Food Res Int 2020; 134:109199. [PMID: 32517911 DOI: 10.1016/j.foodres.2020.109199] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 03/23/2020] [Accepted: 03/26/2020] [Indexed: 01/24/2023]
Abstract
Gly m Bd 60 K, which is the α subunit of β-conglycinin, is a major soybean (Glycine max) allergen. We used high hydrostatic pressure (HHP), thermal techniques, and glycation to treat β-conglycinin, which can effectively reduce the antigenicity of β-conglycinin. β-conglycinin was used to immunize New Zealand rabbits, and the antiserum had a titer > 1: 1 × 105 and an IC50 of 2.254 μg/mL. β-conglycinin was subjected to HHP, thermal techniques, and glycation and mixed with rabbit antiserum against β-conglycinin to obtain the site-specific antiserum. The overlapping gene fragments of Gly m Bd 60 K were amplified by polymerase chain reaction (PCR), then cloned into a T7 phage vector and packaged in vitro, the recombinant T7 phages were constructed. Indirect ELISA (iELISA) was used to locate the destroyed antigenic sites and, after three rounds of segment expression and identification, the C2-1 and C2-2 fragments were identified as destroyed antigenic sites of Gly m Bd 60 K. Allergenicity analysis showed that the C2-1 and C2-2 fragments reacted with allergic patients' serum, which indicated that the destroyed sites were allergic sites.
Collapse
Affiliation(s)
- Jun Xi
- School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, Henan, China.
| | - MengXue He
- School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, Henan, China
| |
Collapse
|
15
|
Xi J, He M, Pi J. Identification of antigenic sites destructed by high hydrostatic pressure (HHP) of the β subunit of β-conglycinin. Int J Biol Macromol 2019; 141:1287-1292. [PMID: 31499107 DOI: 10.1016/j.ijbiomac.2019.09.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 09/05/2019] [Accepted: 09/05/2019] [Indexed: 02/02/2023]
Abstract
β-conglycinin is one of the most allergenic proteins, and its constituent subunits α', α, and β are all potential allergens to humans. In the present study, we concentrated on the destructed antigenic sites of β subunit of β-conglycinin after high hydrostatic pressure (HHP) treatment. In this paper, the overlapping gene fragments of the β subunit of β-conglycinin were amplified by polymerase chain reaction (PCR) and cloned into T7 phage vectors. After being packaged in vitro, the recombinant T7 phage was constructed, and the overlapping fragments of the β subunit were displayed on the phage surface. The recombinant phages that expressed the overlapping fragments of the β subunit were used to react with specific antiserum by indirect ELISA to identify the HHP destructed antigenic sites. After three rounds of expression and identification, we used synthetic peptide technology to identify that the obtained fragment was a conformational epitope. We further confirmed that HHP treatment changed the conformational structure of β-conglycinin, which reduced the antigenicity of the protein.
Collapse
Affiliation(s)
- Jun Xi
- Engineering Technology Research Center for Grain & Oil Food, State Administration of Grain, School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, Henan, China.
| | - MengXue He
- Engineering Technology Research Center for Grain & Oil Food, State Administration of Grain, School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, Henan, China
| | - JiangYi Pi
- Engineering Technology Research Center for Grain & Oil Food, State Administration of Grain, School of Food Science and Technology, Henan University of Technology, Zhengzhou 450001, Henan, China
| |
Collapse
|
16
|
Structural Features of a Conformation-dependent Antigen Epitope on ORFV-B2L Recognized by the 2E4 mAb. Sci Rep 2019; 9:16094. [PMID: 31695071 PMCID: PMC6834619 DOI: 10.1038/s41598-019-52446-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 10/16/2019] [Indexed: 12/03/2022] Open
Abstract
Previously, we successfully prepared a monoclonal antibody (mAb) named 2E4, that directly recognizes the major envelope protein B2L of the orf virus (ORFV), but there is little information about its epitope. Here, we meticulously mapped the 2E4 epitope through combinatorial programs and identified the functional binding domain and a key amino acid residue. Briefly, the simulated epitope peptide closely resembles 84VDVQSKDKDADELR97 located at the N-terminus of B2L, strongly suggesting that the epitope is conformationally or spatially structure-dependent. Subsequently, we combined these findings with the results from the antigenicity prediction of B2L to design three truncated fragments of B2L (F1, F2 and F3) selected using 2E4, and only the F1 fragment was found to be eligible for the advanced stage. Alanine-scanning mutagenesis suggested that the D94 residue is structurally crucial for the 2E4 epitope. The other participating residues, including K61, E62, and D92, together with D94 were responsible for enabling 2E4 binding and served as factors that synergistically enabled binding to the whole 2E4 epitope. In this paper, we describe, for the first time, the architecture of an ORFV conformational epitope, and it is also expected that mAb 2E4 and its epitope can be used for applications relating to orf control.
Collapse
|
17
|
|
18
|
Shah F, Shi A, Ashley J, Kronfel C, Wang Q, Maleki SJ, Adhikari B, Zhang J. Peanut Allergy: Characteristics and Approaches for Mitigation. Compr Rev Food Sci Food Saf 2019; 18:1361-1387. [DOI: 10.1111/1541-4337.12472] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 05/19/2019] [Accepted: 05/22/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Faisal Shah
- Inst. of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key research Laboratory of Agro‐Products ProcessingMinistry of Agriculture Beijing 100193 P. R. China
| | - Aimin Shi
- Inst. of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key research Laboratory of Agro‐Products ProcessingMinistry of Agriculture Beijing 100193 P. R. China
| | - Jon Ashley
- International Iberian Nanotechnology LaboratoryFood Quality and Safety Research group Berga 4715‐330 Portugal
| | - Christina Kronfel
- Food Processing and Sensory Quality ResearchUnited States Dept. of Agriculture New Orleans LA 70124 USA
| | - Qiang Wang
- Inst. of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key research Laboratory of Agro‐Products ProcessingMinistry of Agriculture Beijing 100193 P. R. China
| | - Soheila J. Maleki
- Food Processing and Sensory Quality ResearchUnited States Dept. of Agriculture New Orleans LA 70124 USA
| | - Benu Adhikari
- School of ScienceRMIT Univ. Melbourne VIC 3083 Australia
| | - Jinchuang Zhang
- Inst. of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key research Laboratory of Agro‐Products ProcessingMinistry of Agriculture Beijing 100193 P. R. China
| |
Collapse
|
19
|
Designer covalent heterobivalent inhibitors prevent IgE-dependent responses to peanut allergen. Proc Natl Acad Sci U S A 2019; 116:8966-8974. [PMID: 30962381 PMCID: PMC6500160 DOI: 10.1073/pnas.1820417116] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Allergies are a result of allergen proteins cross-linking allergen-specific IgE (sIgE) on the surface of mast cells and basophils. The diversity and complexity of allergen epitopes, and high-affinity of the sIgE-allergen interaction have impaired the development of allergen-specific inhibitors of allergic responses. This study presents a design of food allergen-specific sIgE inhibitors named covalent heterobivalent inhibitors (cHBIs) that selectively form covalent bonds to only sIgEs, thereby permanently inhibiting them. Using screening reagents termed nanoallergens, we identified two immunodominant epitopes in peanuts that were common in a population of 16 allergic patients. Two cHBIs designed to inhibit only these two epitopes completely abrogated the allergic response in 14 of the 16 patients in an in vitro assay and inhibited basophil activation in an allergic patient ex vivo analysis. The efficacy of the cHBI design has valuable clinical implications for many allergen-specific responses and more broadly for any antibody-based disease.
Collapse
|
20
|
Islam MT, Biswas S, Bagchi R, Khan MR, Khalipha ABR, Rouf R, Uddin SJ, Shilpi JA, Bardaweel SK, Sabbah DA, Mubarak MS. Ponicidin as a promising anticancer agent: Its biological and biopharmaceutical profile along with a molecular docking study. Biotechnol Appl Biochem 2019; 66:434-444. [DOI: 10.1002/bab.1740] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 02/21/2019] [Indexed: 12/21/2022]
Affiliation(s)
- Muhammad Torequl Islam
- Department for Management of Science and Technology DevelopmentTon Duc Thang University Ho Chi Minh City Vietnam
- Faculty of PharmacyTon Duc Thang University Ho Chi Minh City Vietnam
| | - Sajal Biswas
- Department of PharmacyLife Science FacultyBangabandhu Sheikh Mujibur Rahman Science & Technology University Gopalganj Bangladesh
| | - Rajat Bagchi
- Department of PharmacyLife Science FacultyBangabandhu Sheikh Mujibur Rahman Science & Technology University Gopalganj Bangladesh
| | - Md. Roich Khan
- Department of PharmacyLife Science FacultyBangabandhu Sheikh Mujibur Rahman Science & Technology University Gopalganj Bangladesh
| | - Abul Bashar Ripon Khalipha
- Department of PharmacyLife Science FacultyBangabandhu Sheikh Mujibur Rahman Science & Technology University Gopalganj Bangladesh
| | - Razina Rouf
- Department of PharmacyLife Science FacultyBangabandhu Sheikh Mujibur Rahman Science & Technology University Gopalganj Bangladesh
| | - Shaikh Jamal Uddin
- Pharmacy DisciplineLife Science SchoolKhulna University Khulna Bangladesh
| | - Jamil A. Shilpi
- Pharmacy DisciplineLife Science SchoolKhulna University Khulna Bangladesh
| | - Sanaa K. Bardaweel
- Department of Pharmaceutical SciencesFaculty of PharmacyThe University of Jordan Amman Jordan
| | - Dima A. Sabbah
- Department of PharmacyFaculty of PharmacyAl‐Zaytoonah University of Jordan Amman Jordan
| | | |
Collapse
|
21
|
Du H, Wu C, Li C, Fang R, Ma J, Ji J, Li Z, Li N, Peng Y, Zhou Z. Two novel cross‑protective antigens for bovine Pasteurella multocida. Mol Med Rep 2017; 16:4627-4633. [PMID: 28791368 PMCID: PMC5647017 DOI: 10.3892/mmr.2017.7153] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 02/20/2017] [Indexed: 11/12/2022] Open
Abstract
Pasteurella multocida is an important pathogen that leads to a range of diseases that have severe economic consequences on cattle production. In order to develop an effective cross-protective component vaccine, an immunoproteomics approach was used to analyze outer membrane proteins (OMPs) of the P. multocida serotype A, B and F strains. Candidate antigen molecules from the whole genome were screened via linear trap quadrupole mass spectrometry and bioinformatics analysis, and the reactogenicity of the candidate antigen molecules was analyzed via cloning, expression, and ELISA or protein immunoblotting, and the vaccine efficacy of the candidate molecules was determined in infective animal models and cross-protective antigens may be obtained. rPmCQ2_2g0128, rPmCQ2_1g0327 and rPmCQ2_1g0020 proteins were selected. Their protective rates were 40/30/20% (rPmCQ2_2g0128), 50/40/0% (rPmCQ2_1g0327) and 0/40/30% (rPmCQ2_1g0020) against ten-fold median lethal dose (10LD50) of the P. multocida serotypes A, B and F in a mouse model, respectively. The results suggested that the two proteins rPmCQ2_2g0128 and rPmCQ2_1g0327 may be used as vaccine candidates against bovine P. multocida serotypes A, B. To the best of our knowledge, the present study was the first to identify cross-protective antigens, extracted OMPs from bovine P. multocida.
Collapse
Affiliation(s)
- Huihui Du
- The State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, P.R. China
| | - Chenlu Wu
- College of Animal Science and Technology, Southwest University, Chongqing 400716, P.R. China
| | - Chunming Li
- College of Animal Science and Technology, Southwest University, Chongqing 400716, P.R. China
| | - Rendong Fang
- College of Animal Science and Technology, Southwest University, Chongqing 400716, P.R. China
| | - Jianwei Ma
- College of Animal Science and Technology, Southwest University, Chongqing 400716, P.R. China
| | - Jiale Ji
- College of Animal Science and Technology, Southwest University, Chongqing 400716, P.R. China
| | - Zhihong Li
- The State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, P.R. China
| | - Nengzhang Li
- College of Animal Science and Technology, Southwest University, Chongqing 400716, P.R. China
| | - Yuanyi Peng
- College of Animal Science and Technology, Southwest University, Chongqing 400716, P.R. China
| | - Zeyang Zhou
- The State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, P.R. China
| |
Collapse
|
22
|
Havenith H, Kern K, Rautenberger P, Spiegel H, Szardenings M, Ueberham E, Lehmann J, Buntru M, Vogel S, Treudler R, Fischer R, Schillberg S. Combination of two epitope identification techniques enables the rational design of soy allergen Gly m 4 mutants. Biotechnol J 2017; 12. [PMID: 27906504 DOI: 10.1002/biot.201600441] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 11/29/2016] [Accepted: 11/30/2016] [Indexed: 11/08/2022]
Abstract
Detailed IgE-binding epitope analysis is a key requirement for the understanding and development of diagnostic and therapeutic agents to address food allergies. An IgE-specific linear peptide microarray with random phage peptide display for the high-resolution mapping of IgE-binding epitopes of the major soybean allergen Gly m 4, which is a homologue to the birch pollen allergen Bet v 1 is combined. Three epitopes are identified and mapped to a resolution of four key amino acids, allowing the rational design and the production of three Gly m 4 mutants with the aim to abolish or reduce the binding of epitope-specific IgE. In ELISA, the binding of the mutant allergens to polyclonal rabbit-anti Gly m 4 serum as well as IgE purified from Gly m 4-reactive soybean allergy patient sera is reduced by up to 63% compared to the wild-type allergen. Basophil stimulation experiments using RBL-SX38 cells loaded with patient IgE are showed a decreased stimulation from 25% for the wild-type Gly m 4 to 13% for one mutant. The presented approach demonstrates the feasibility of precise mapping of allergy-related IgE-binding epitopes, allowing the rational design of less allergenic mutants as potential therapeutic agents.
Collapse
Affiliation(s)
- Heide Havenith
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Aachen, Germany
| | - Karolin Kern
- Fraunhofer Institute for Cell Therapy and Immunology IZI, Leipzig, Germany
| | - Paul Rautenberger
- Fraunhofer Institute for Cell Therapy and Immunology IZI, Leipzig, Germany
| | - Holger Spiegel
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Aachen, Germany
| | | | - Elke Ueberham
- Fraunhofer Institute for Cell Therapy and Immunology IZI, Leipzig, Germany
| | - Jörg Lehmann
- Fraunhofer Institute for Cell Therapy and Immunology IZI, Leipzig, Germany
| | - Matthias Buntru
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Aachen, Germany
| | - Simon Vogel
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Aachen, Germany
| | - Regina Treudler
- Dermatology, Venereology and Allergology Clinic, University of Leipzig, Leipzig, Germany
| | - Rainer Fischer
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Aachen, Germany
- RWTH Aachen University, Institute for Molecular Biotechnology, Aachen, Germany
| | - Stefan Schillberg
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Aachen, Germany
- Institute for Phytopathology and Applied Zoology, Justus-Liebig University Giessen, Gießen, Germany
| |
Collapse
|
23
|
Govindaraj D, Sharma S, Gaur S, Lavasa S, Prasad N, Arora N. Immunogenic peptides: B & T Cell Epitopes of Per a 10 Allergen of Periplaneta americana. Mol Immunol 2016; 80:24-32. [DOI: 10.1016/j.molimm.2016.10.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 10/11/2016] [Accepted: 10/14/2016] [Indexed: 11/24/2022]
|
24
|
Chen X, Negi SS, Liao S, Gao V, Braun W, Dreskin SC. Conformational IgE epitopes of peanut allergens Ara h 2 and Ara h 6. Clin Exp Allergy 2016; 46:1120-1128. [PMID: 27238146 DOI: 10.1111/cea.12764] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 05/11/2016] [Accepted: 05/14/2016] [Indexed: 12/01/2022]
Abstract
BACKGROUND Cross-linking of IgE antibody by specific epitopes on the surface of mast cells is a prerequisite for triggering symptoms of peanut allergy. IgE epitopes are frequently categorized as linear or conformational epitopes. Although linear IgE-binding epitopes of peanut allergens have been defined, little is known about conformational IgE-binding epitopes. OBJECTIVE To identify clinically relevant conformational IgE epitopes of the two most important peanut allergens, Ara h 2 and Ara h 6, using phage peptide library. METHODS A phage 12mer peptide library was screened with allergen-specific IgE from 4 peanut-allergic patients. Binding of the mimotopes to IgE from a total of 29 peanut-allergic subjects was measured by ELISA. The mimotope sequences were mapped on the surface areas of Ara h 2 and Ara h 6 using EpiSearch. RESULTS Forty-one individual mimotopes were identified that specifically bind anti- Ara h 2/Ara h 6 IgE as well as rabbit anti-Ara h 2 and anti-Ara h 6 IgG. Sequence alignment showed that none of the mimotope sequences match a linear segment of the Ara h 2 or Ara h 6 sequences. EpiSearch analysis showed that all the mimotopes mapped to surface patches of Ara h 2 and Ara h 6. Eight of the mimotopes were recognized by more than 90% of the patients, suggesting immunodominance. Each patient had distinct IgE recognition patterns but the recognition frequency was not correlated to the concentration of peanut specific IgE or to clinical history. CONCLUSIONS The mimotopes identified in this study represent conformational epitopes. Identification of similar surface patches on Ara h 2 and Ara h 6 further underscores the similarities between these two potent allergens.
Collapse
Affiliation(s)
- Xueni Chen
- Division of Allergy and Clinical Immunology, Departments of Medicine and Immunology, University of Colorado Denver, Aurora, CO
| | - Surendra S Negi
- Sealy Center for Structural Biology and Molecular Biophysics, Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, Galveston, TX 77555
| | - Sumei Liao
- Division of Allergy and Clinical Immunology, Departments of Medicine and Immunology, University of Colorado Denver, Aurora, CO
| | - Valerie Gao
- Molecular Cellular Developmental Biology, University of Colorado, Boulder, CO
| | - Werner Braun
- Sealy Center for Structural Biology and Molecular Biophysics, Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, Galveston, TX 77555
| | - Stephen C Dreskin
- Division of Allergy and Clinical Immunology, Departments of Medicine and Immunology, University of Colorado Denver, Aurora, CO
| |
Collapse
|
25
|
Ahmad TA, Eweida AE, Sheweita SA. B-cell epitope mapping for the design of vaccines and effective diagnostics. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.trivac.2016.04.003] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
26
|
Matsuo H, Yokooji T, Taogoshi T. Common food allergens and their IgE-binding epitopes. Allergol Int 2015; 64:332-43. [PMID: 26433529 DOI: 10.1016/j.alit.2015.06.009] [Citation(s) in RCA: 151] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 06/18/2015] [Accepted: 06/23/2015] [Indexed: 12/26/2022] Open
Abstract
Food allergy is an adverse immune response to certain kinds of food. Although any food can cause allergic reactions, chicken egg, cow's milk, wheat, shellfish, fruit, and buckwheat account for 75% of food allergies in Japan. Allergen-specific immunoglobulin E (IgE) antibodies play a pivotal role in the development of food allergy. Recent advances in molecular biological techniques have enabled the efficient analysis of food allergens. As a result, many food allergens have been identified, and their molecular structure and IgE-binding epitopes have also been identified. Studies of allergens have demonstrated that IgE antibodies specific to allergen components and/or the peptide epitopes are good indicators for the identification of patients with food allergy, prediction of clinical severity and development of tolerance. In this review, we summarize our current knowledge regarding the allergens and IgE epitopes in the well-researched allergies to chicken egg, cow's milk, wheat, shrimp, and peanut.
Collapse
Affiliation(s)
- Hiroaki Matsuo
- Department of Pharmaceutical Services, Hiroshima University Hospital, Hiroshima, Japan.
| | - Tomoharu Yokooji
- Department of Pathophysiology and Therapeutics, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Takanori Taogoshi
- Department of Pharmaceutical Services, Hiroshima University Hospital, Hiroshima, Japan
| |
Collapse
|
27
|
In vitro assessment of allergenicity features and localization of probable IgE binding regions. Food Chem Toxicol 2015; 84:181-7. [PMID: 26321724 DOI: 10.1016/j.fct.2015.08.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 08/12/2015] [Accepted: 08/19/2015] [Indexed: 11/23/2022]
Abstract
Rice is cultivated as a staple grain crop in many countries, especially in Asia. In the present study, recombinant rice chitinase was expressed, purified and characterized by in silico and immunobiochemical methods. Rice chitinase was affinity purified and it resolved at 24 kDa on SDS-PAGE. Purified protein was analyzed for pepsin resistance, heat stability, and IgE binding using atopic patients' sera. Chitinase was resistant to pepsin digestion and heat treatment at 90 °C for 1 h. It showed significant IgE binding with 7 of 110 patients' sera positive to different food allergens. Homology modeled 3D structure of rice chitinase was used for B cell epitope prediction. In silico predicted B cell peptides were assessed for IgE binding by ELISA using food allergic patients' sera, epitope RC2 showed IgE binding comparable to chitinase. In conclusion, chitinase was identified as a potential allergen and may share cross reactive epitopes with food allergens.
Collapse
|