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Alves VV, Arantes LCRV, Lages da Silva DH, Oliveira ES, Figueiredo de Souza J, Teixeira da Silva M, Dias Araújo M, Carvalho RDDO, Reis Cunha JL, Camargos Lara LJ, Ecco R, da Silva Martins NR, Barrow PA, de Freitas Neto OC. Effects of in ovo injection of bacterial peptides and CpG-ODN on Salmonella enterica serovar Heidelberg infection in specific pathogen-free (SPF) chicks. Avian Pathol 2024; 53:182-193. [PMID: 38240226 DOI: 10.1080/03079457.2024.2307567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Accepted: 01/15/2024] [Indexed: 02/10/2024]
Abstract
RESEARCH HIGHLIGHTS Peptides + CpG-ODN reduced SH in caeca at the first week post-infection.Administered formulations did not reduce SH-faecal excretion.Levels of intestinal IgA were similar between all groups.CpG-ODN improved some parameters associated with chick intestinal health.
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Affiliation(s)
- Victória Veiga Alves
- Department of Preventive Veterinary Medicine, Veterinary School, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | | | - Dayse Helena Lages da Silva
- Sector of Animal Pathology and MULTILAB, Department Veterinary Clinic and Surgery, Veterinary School, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - Eric Santos Oliveira
- Sector of Animal Pathology and MULTILAB, Department Veterinary Clinic and Surgery, Veterinary School, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - Julia Figueiredo de Souza
- Department of Preventive Veterinary Medicine, Veterinary School, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - Mailson Teixeira da Silva
- Department of Preventive Veterinary Medicine, Veterinary School, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - Matheus Dias Araújo
- Sector of Animal Pathology and MULTILAB, Department Veterinary Clinic and Surgery, Veterinary School, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | | | | | - Leonardo José Camargos Lara
- Department of Animal Science, Veterinary School, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - Roselene Ecco
- Sector of Animal Pathology and MULTILAB, Department Veterinary Clinic and Surgery, Veterinary School, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | - Nelson Rodrigo da Silva Martins
- Department of Preventive Veterinary Medicine, Veterinary School, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
| | | | - Oliveiro Caetano de Freitas Neto
- Department of Preventive Veterinary Medicine, Veterinary School, Federal University of Minas Gerais (UFMG), Belo Horizonte, Brazil
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2
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Liu K, Lin S, Gao X, Wang S, Liu Y, Liu Q, Sun N. Reduced Allergenicity of Shrimp ( Penaeus vannamei) by Altering the Protein Fold, Digestion Susceptibility, and Allergen Epitopes. J Agric Food Chem 2023. [PMID: 37257052 DOI: 10.1021/acs.jafc.3c01557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The mechanism by which thermal/pressure processing influences the allergenicity of shrimp (Penaeus vannamei) was explored by anaphylaxis in mice, the protein structure, gastrointestinal digestion, and linear epitopes. Roasting induced the unfolding of the structure, which may reduce the allergenicity, but it made more linear epitopes to be exposed, causing mice to exhibit similar systemic anaphylaxis as mice fed with the raw shrimp protein (p > 0.05). However, the roasted + reverse-pressure-sterilized shrimp can significantly reduce specific antibodies, mast cell degranulation, vascular permeability, and histopathological morphology in mice compared with the raw and roasted shrimp (p < 0.05) because reverse-pressure sterilization causes protein to aggregate, hiding the heat/digested stable epitopes of arginine kinase (Glu59-Ser63, Asn112-Lys118, Leu131-Phe136, and Ser158-Glu162) and sarcoplasmic calcium-binding protein (Asn57-Phe67, Ser159-Cys165, and Glu126-Ala130) inside a 3D structure, while gastrointestinal digestion can destroy immunodominant, minor epitopes and the epitopes exposed by roasting. Meanwhile, the low binding frequency of IgE to troponin C was also responsible for maintaining the hypoallergenicity of shrimp.
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Affiliation(s)
- Kexin Liu
- School of Food Science and Technology, National Engineering Research Center of Seafood, Dalian Polytechnic University, Dalian 116034, P. R. China
| | - Songyi Lin
- School of Food Science and Technology, National Engineering Research Center of Seafood, Dalian Polytechnic University, Dalian 116034, P. R. China
- Liaoning Engineering Research Center of Special Dietary Food, Dalian Polytechnic University, Dalian 116034, P. R. China
| | - Xingchen Gao
- School of Food Science and Technology, National Engineering Research Center of Seafood, Dalian Polytechnic University, Dalian 116034, P. R. China
| | - Shan Wang
- School of Food Science and Technology, National Engineering Research Center of Seafood, Dalian Polytechnic University, Dalian 116034, P. R. China
| | - Yao Liu
- School of Food Science and Technology, National Engineering Research Center of Seafood, Dalian Polytechnic University, Dalian 116034, P. R. China
| | - Qiaozhen Liu
- School of Food Science and Technology, National Engineering Research Center of Seafood, Dalian Polytechnic University, Dalian 116034, P. R. China
| | - Na Sun
- School of Food Science and Technology, National Engineering Research Center of Seafood, Dalian Polytechnic University, Dalian 116034, P. R. China
- Liaoning Engineering Research Center of Special Dietary Food, Dalian Polytechnic University, Dalian 116034, P. R. China
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3
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da Silva BM, Ascher DB, Pires DEV. epitope1D: accurate taxonomy-aware B-cell linear epitope prediction. Brief Bioinform 2023; 24:7111720. [PMID: 37039696 DOI: 10.1093/bib/bbad114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 01/30/2023] [Accepted: 03/07/2023] [Indexed: 04/12/2023] Open
Abstract
The ability to identify B-cell epitopes is an essential step in vaccine design, immunodiagnostic tests and antibody production. Several computational approaches have been proposed to identify, from an antigen protein or peptide sequence, which residues are more likely to be part of an epitope, but have limited performance on relatively homogeneous data sets and lack interpretability, limiting biological insights that could otherwise be obtained. To address these limitations, we have developed epitope1D, an explainable machine learning method capable of accurately identifying linear B-cell epitopes, leveraging two new descriptors: a graph-based signature representation of protein sequences, based on our well-established Cutoff Scanning Matrix algorithm and Organism Ontology information. Our model achieved Areas Under the ROC curve of up to 0.935 on cross-validation and blind tests, demonstrating robust performance. A comprehensive comparison to alternative methods using distinct benchmark data sets was also employed, with our model outperforming state-of-the-art tools. epitope1D represents not only a significant advance in predictive performance, but also allows biologically meaningful features to be combined and used for model interpretation. epitope1D has been made available as a user-friendly web server interface and application programming interface at https://biosig.lab.uq.edu.au/epitope1d/.
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Affiliation(s)
- Bruna Moreira da Silva
- Systems and Computational Biology, Bio21 Institute, University of Melbourne, Melbourne, Victoria, Australia
- Computational Biology and Clinical Informatics, Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia
- School of Computing and Information Systems, University of Melbourne, Melbourne, Victoria, Australia
| | - David B Ascher
- Systems and Computational Biology, Bio21 Institute, University of Melbourne, Melbourne, Victoria, Australia
- Computational Biology and Clinical Informatics, Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia
- The School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia
| | - Douglas E V Pires
- Systems and Computational Biology, Bio21 Institute, University of Melbourne, Melbourne, Victoria, Australia
- Computational Biology and Clinical Informatics, Baker Heart and Diabetes Institute, Melbourne, Victoria, Australia
- School of Computing and Information Systems, University of Melbourne, Melbourne, Victoria, Australia
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Gong HR, Hu YF, Li X, Yau T, Zhang BZ, Huang JD. Non-Neutralizing Epitopes Shade Neutralizing Epitopes against Omicron in a Multiple Epitope-Based Vaccine. ACS Infect Dis 2022; 8:2586-2593. [PMID: 36357959 PMCID: PMC9662650 DOI: 10.1021/acsinfecdis.2c00488] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Indexed: 11/13/2022]
Abstract
The ongoing coronavirus disease 2019 pandemic has raised concerns about the risk of re-infection. Non-neutralizing epitopes are one of the major reasons for antibody-dependent enhancement. Past studies on the ancestral severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have revealed an infectivity-enhancing site on the ancestral SARS-CoV-2 spike protein. However, infection enhancement associated with the SARS-CoV-2 Omicron strain remains elusive. In this study, we examined the antibodies induced by a multiple epitope-based vaccine, which showed infection enhancement for the Omicron strain but not for the ancestral SARS-CoV-2 or Delta strain. By examining the antibodies induced by single epitope-based vaccines, we identified a conserved epitope, IDf (450-469), with neutralizing activity against ancestral SARS-CoV-2, Delta, and Omicron. Although neutralizing epitopes are present in the multiple epitope-based vaccine, other immunodominant non-neutralizing epitopes such as IDg (480-499) can shade their neutralizing activity, leading to infection enhancement of Omicron. Our study provides up-to-date epitope information on SARS-CoV-2 variants to help design better vaccines or antibody-based therapeutics against future variants.
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Affiliation(s)
- Hua-Rui Gong
- School of Biomedical Sciences, Li Ka Shing Faculty of
Medicine, University of Hong Kong, 3/F, Laboratory Block, 21
Sassoon Road, Hong kong999077, China
| | - Ye-fan Hu
- School of Biomedical Sciences, Li Ka Shing Faculty of
Medicine, University of Hong Kong, 3/F, Laboratory Block, 21
Sassoon Road, Hong kong999077, China
- Department of Medicine, School of Clinical Medicine,
University of Hong Kong, 4/F Professional Block, Queen Mary
Hospital, 102 Pokfulam Road, Hong Kong999077, China
| | - Xuechen Li
- Department of Chemistry, University of Hong
Kong, Pokfulam Road, Hong Kong999077, China
| | - Thomas Yau
- Department of Medicine, School of Clinical Medicine,
University of Hong Kong, 4/F Professional Block, Queen Mary
Hospital, 102 Pokfulam Road, Hong Kong999077, China
| | - Bao-Zhong Zhang
- Chinese Academy of Sciences (CAS) Key
Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology,
Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences,
Shenzhen518055, China
| | - Jian-Dong Huang
- School of Biomedical Sciences, Li Ka Shing Faculty of
Medicine, University of Hong Kong, 3/F, Laboratory Block, 21
Sassoon Road, Hong kong999077, China
- Chinese Academy of Sciences (CAS) Key
Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology,
Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences,
Shenzhen518055, China
- Department of Clinical Oncology, Shenzhen Key Laboratory
for Cancer Metastasis and Personalized Therapy, The University of Hong
Kong-Shenzhen Hospital, Shenzhen518055, China
- Guangdong-Hong Kong Joint Laboratory for RNA Medicine,
Sun Yat-Sen University, Guangzhou510120,
China
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Arnaboldi PM, Katseff AS, Sambir M, Dattwyler RJ. Linear Peptide Epitopes Derived from ErpP, p35, and FlaB in the Serodiagnosis of Lyme Disease. Pathogens 2022; 11:944. [PMID: 36015064 DOI: 10.3390/pathogens11080944] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/13/2022] [Accepted: 08/16/2022] [Indexed: 11/16/2022] Open
Abstract
Lyme disease is the most common vector-borne disease in the northern hemisphere. Current serodiagnostics are insensitive in early infection. Sensitivity in these seroassays is compromised by the necessity to preserve specificity in the presence of cross-reactive epitopes in Borrelia burgdorferi target antigens. We evaluated the efficacy of using synthetic peptides containing epitopes unique to B. burgdorferi as antigen targets in a Lyme disease seroassay. We performed linear B cell epitope mapping of the proteins p35 (BBH32) and ErpP to identify unique epitopes. We generated peptides containing these newly identified linear epitope sequences along with previously identified epitopes from the antigens FlaB and VlsE and evaluated their diagnostic capabilities via ELISA using large serum sets. Single-epitope peptides, while specific, demonstrated insufficient sensitivity. However, when epitopes from FlaB, ErpP, or p35 were combined in tandem with an epitope from VlsE, the sensitivity of the assay was significantly increased without compromising specificity. The identification of additional unique epitopes from other B. burgdorferi antigens and the further development of a combined multi-peptide-based assay for the laboratory diagnosis of Lyme disease offers a way to address the poor specificity associated with the use of whole protein antigen targets and thus significantly improve the laboratory diagnosis of Lyme disease.
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Cheng Q, Feng X, Zhao X, Gu R, Lu J, Liu W, Li G. Physicochemical characterization and identification of major linear epitopes of sarcoplasmic calcium-binding protein (SCP) allergen from Pacific oyster (Crassostrea gigas). J Sci Food Agric 2022; 102:3551-3562. [PMID: 34854091 DOI: 10.1002/jsfa.11699] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 11/11/2021] [Accepted: 12/01/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Food allergy is a serious public nutritional health problem that has attracted extensive worldwide attention. Shellfish allergy is a long-lasting disorder that has a lifelong impact on health. Sarcoplasmic calcium-binding protein (SCP) plays a vital role in cell and muscle functions and has been identified as an allergen in oyster. RESULTS In this study, recombinant SCP (rSCP) with a molecular mass of 21 kDa was produced and identified based on SCP amino acid sequencing of Pacific oyster (Crassostrea gigas), and was used as a follow-up experimental material. Its physicochemical characterization showed that purified rSCP is highly stable to heat and acid-alkali and trypsin digestion but less resistant to pepsin digestion. We established an animal sensitization model and rSCP displayed stronger Immunoglobulin E (IgE)-binding activity with rat serum in the rSCP + cholera toxin (CT) group compared with the CT group and a control group. Five epitope peptides were identified as linear immunodominant epitopes by indirect competitive enzyme-linked immunosorbent assay (icELISA) for the first time. We also found that conformational epitopes may play a major role in the immunoreactivity of SCP. CONCLUSION These results are significant for understanding hypersensitization of humans to oyster and offer available preventive measures and treatment programs in further research. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Qingli Cheng
- Beijing Engineering Research Center of Protein & Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, PR China
| | - Xiaowen Feng
- Beijing Engineering Research Center of Protein & Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, PR China
| | - Xiaohan Zhao
- Beijing Engineering Research Center of Protein & Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, PR China
| | - Ruizeng Gu
- Beijing Engineering Research Center of Protein & Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, PR China
| | - Jun Lu
- Beijing Engineering Research Center of Protein & Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, PR China
| | - Wenying Liu
- Beijing Engineering Research Center of Protein & Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, PR China
| | - Guoming Li
- Beijing Engineering Research Center of Protein & Functional Peptides, China National Research Institute of Food and Fermentation Industries, Beijing, PR China
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Hein S, Benz NI, Eisert J, Herrlein ML, Oberle D, Dreher M, Stingl JC, Hildt C, Hildt E. Comirnaty-Elicited and Convalescent Sera Recognize Different Spike Epitopes. Vaccines (Basel) 2021; 9:1419. [PMID: 34960165 PMCID: PMC8708883 DOI: 10.3390/vaccines9121419] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 11/09/2021] [Accepted: 11/26/2021] [Indexed: 12/18/2022] Open
Abstract
Many of the approved SARS-CoV-2 vaccines are based on a stabilized variant of the spike protein. This raises the question of whether the immune response against the stabilized spike is identical to the immune response that is elicited by the native spike in the case of a SARS-CoV-2 infection. Using a peptide array-based approach, we analysed the binding of antibodies from Comirnaty-elicited, convalescent, and control sera to the peptides covering the spike protein. A total of 37 linear epitopes were identified. A total of 26 of these epitopes were almost exclusively recognized by the convalescent sera. Mapping these epitopes to the spike structures revealed that most of these 26 epitopes are masked in the pre-fusion structure. In particular, in the conserved central helix, three epitopes that are only exposed in the post-fusion conformation were identified. This indicates a higher spike-specific antibody diversity in convalescent sera. These differences could be relevant for the breadth of spike-specific immune response.
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Affiliation(s)
- Sascha Hein
- Department of Virology, Paul-Ehrlich-Institut, Paul-Ehrlich Street 51–59, D-63225 Langen, Germany; (N.I.B.); (J.E.); (M.-L.H.)
| | - Nuka Ivalu Benz
- Department of Virology, Paul-Ehrlich-Institut, Paul-Ehrlich Street 51–59, D-63225 Langen, Germany; (N.I.B.); (J.E.); (M.-L.H.)
| | - Jonathan Eisert
- Department of Virology, Paul-Ehrlich-Institut, Paul-Ehrlich Street 51–59, D-63225 Langen, Germany; (N.I.B.); (J.E.); (M.-L.H.)
| | - Marie-Luise Herrlein
- Department of Virology, Paul-Ehrlich-Institut, Paul-Ehrlich Street 51–59, D-63225 Langen, Germany; (N.I.B.); (J.E.); (M.-L.H.)
| | - Doris Oberle
- Division of Pharmacovigilance, Paul-Ehrlich-Institut, Paul-Ehrlich Street 51–59, D-63325 Langen, Germany;
| | - Michael Dreher
- Department of Pneumology and Intensive Care Medicine, RWTH Aachen University Hospital Aachen, Pauwelsstraße 30, D-52074 Aachen, Germany;
| | - Julia C. Stingl
- Institute of Clinical Pharmacology, RWTH Aachen University Hospital Aachen, Pauwelsstraße 30, D-52074 Aachen, Germany;
| | - Christoph Hildt
- Main-Kinzig-Kliniken, Herzbachweg 14, D-63571 Gelnhausen, Germany;
| | - Eberhard Hildt
- Department of Virology, Paul-Ehrlich-Institut, Paul-Ehrlich Street 51–59, D-63225 Langen, Germany; (N.I.B.); (J.E.); (M.-L.H.)
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Chen YY, Li MS, Liu M, Yun X, Huan F, Liu QM, Cao MJ, Chen GX, Lai D, Liu GM. Linear Epitopes Play an Important Role in the Immunoglobulin G (IgG)/Immunoglobulin E (IgE)-Binding Capacity of Scy p 4. J Agric Food Chem 2021; 69:12870-12879. [PMID: 34689550 DOI: 10.1021/acs.jafc.1c05464] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Sarcoplasmic calcium-binding protein is a stable allergen in Scylla paramamosain and named Scy p 4. To explore the importance of linear epitopes in the immunoglobulin G (IgG)/immunoglobulin E (IgE)-binding capacity of Scy p 4, chemical denaturants were used to destroy the structure. Scy p 4 was reduced with dithiothreitol and subsequently alkylated with iodoacetamide (IAA). Furthermore, the structural analysis indicated that IAA-Scy p 4 was an unstructured protein. The inhibition enzyme-linked immunosorbent assay showed that IAA-Scy p 4 could inhibit the binding of Scy p 4 to sensitize serum, with inhibition rates reached 55%. Moreover, the linear mimotopes of Scy p 4 were predicted in silico. Three linear epitopes were verified by serological tests and named L-Scy p 4-1 (AA76-91), L-Scy p 4-2 (AA111-125), and L-Scy p 4-3 (AA137-146). Overall, these data provide an understanding of the relationship between the structure and allergenicity about Scy p 4, and the identified linear epitopes can be used for diagnosis and food processing of shellfish allergy.
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Affiliation(s)
- Yi-Yu Chen
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, Xiamen, Fujian 361021, People's Republic of China
| | - Meng-Si Li
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, Xiamen, Fujian 361021, People's Republic of China
| | - Meng Liu
- College of Marine Biology, Xiamen Ocean Vocational College, Xiamen, Fujian 361102, People's Republic of China
| | - Xiao Yun
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, Xiamen, Fujian 361021, People's Republic of China
| | - Fei Huan
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, Xiamen, Fujian 361021, People's Republic of China
| | - Qing-Mei Liu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, Xiamen, Fujian 361021, People's Republic of China
| | - Min-Jie Cao
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, Xiamen, Fujian 361021, People's Republic of China
| | - Gui-Xia Chen
- Women and Children's Hospital Affiliated to Xiamen University, Xiamen, Fujian 361003, People's Republic of China
| | - Dong Lai
- The Second Affiliated Hospital of Xiamen Medical College, Xiamen, Fujian 361021, People's Republic of China
| | - Guang-Ming Liu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, Xiamen, Fujian 361021, People's Republic of China
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Fumagalli MJ, Figueiredo LTM, Aquino VH. Linear and Continuous Flavivirus Epitopes From Naturally Infected Humans. Front Cell Infect Microbiol 2021; 11:710551. [PMID: 34458161 PMCID: PMC8387565 DOI: 10.3389/fcimb.2021.710551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Accepted: 07/15/2021] [Indexed: 12/27/2022] Open
Abstract
This manuscript is an up-to-date review of experimentally validated linear and continuous epitopes identified from arbovirus members of the Flavivirus genus. We summarized 153 immunoreactive peptides from the Dengue virus, Zika virus, Japanese encephalitis virus, West Nile virus, and tick-borne encephalitis virus described in studies published from 1989 to 2020. We included peptides from structural (envelope, capsid, and pre-membrane) and nonstructural (Ns1–5) viral proteins that demonstrated relevant immunoreactivity with antibodies from naturally infected or vaccinated humans. We included peptides that demonstrated relevant reactivity features, such as indicators of disease severity related to immunological or immunopathological outcomes, differential or group diagnostic markers, immunotherapy candidates, and potential for vaccine formulation. The majority of immunoreactive peptides were described for DENV probably due to its long-lasting impact on human health and the lack of efficient vaccines and therapeutic methods. Immune landscape data regarding linear immunoreactive and continuous flavivirus peptides are still scarce, and a complete and more detailed map remains to be elucidated. Therefore, this review provides valuable data for those investigating the antibody response against flavivirus infection.
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Affiliation(s)
- Marcilio Jorge Fumagalli
- Virology Research Center, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | | | - Victor Hugo Aquino
- Laboratory of Virology, Department of Clinical Analyses, Toxicology and Food Sciences, Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
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10
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Ricci AD, Brunner M, Ramoa D, Carmona SJ, Nielsen M, Agüero F. APRANK: Computational Prioritization of Antigenic Proteins and Peptides From Complete Pathogen Proteomes. Front Immunol 2021; 12:702552. [PMID: 34335615 PMCID: PMC8320365 DOI: 10.3389/fimmu.2021.702552] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 06/22/2021] [Indexed: 01/09/2023] Open
Abstract
Availability of highly parallelized immunoassays has renewed interest in the discovery of serology biomarkers for infectious diseases. Protein and peptide microarrays now provide a rapid, high-throughput platform for immunological testing and validation of potential antigens and B-cell epitopes. However, there is still a need for tools to prioritize and select relevant probes when designing these arrays. In this work we describe a computational method called APRANK (Antigenic Protein and Peptide Ranker) which integrates multiple molecular features to prioritize potentially antigenic proteins and peptides in a given pathogen proteome. These features include subcellular localization, presence of repetitive motifs, natively disordered regions, secondary structure, transmembrane spans and predicted interaction with the immune system. We trained and tested this method with a number of bacteria and protozoa causing human diseases: Borrelia burgdorferi (Lyme disease), Brucella melitensis (Brucellosis), Coxiella burnetii (Q fever), Escherichia coli (Gastroenteritis), Francisella tularensis (Tularemia), Leishmania braziliensis (Leishmaniasis), Leptospira interrogans (Leptospirosis), Mycobacterium leprae (Leprae), Mycobacterium tuberculosis (Tuberculosis), Plasmodium falciparum (Malaria), Porphyromonas gingivalis (Periodontal disease), Staphylococcus aureus (Bacteremia), Streptococcus pyogenes (Group A Streptococcal infections), Toxoplasma gondii (Toxoplasmosis) and Trypanosoma cruzi (Chagas Disease). We have evaluated this integrative method using non-parametric ROC-curves and made an unbiased validation using Onchocerca volvulus as an independent data set. We found that APRANK is successful in predicting antigenicity for all pathogen species tested, facilitating the production of antigen-enriched protein subsets. We make APRANK available to facilitate the identification of novel diagnostic antigens in infectious diseases.
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Affiliation(s)
- Alejandro D Ricci
- Instituto de Investigaciones Biotecnológicas "Rodolfo Ugalde" (IIB), Universidad de San Martín (UNSAM) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Mauricio Brunner
- Instituto de Investigaciones Biotecnológicas "Rodolfo Ugalde" (IIB), Universidad de San Martín (UNSAM) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Diego Ramoa
- Instituto de Investigaciones Biotecnológicas "Rodolfo Ugalde" (IIB), Universidad de San Martín (UNSAM) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Santiago J Carmona
- Instituto de Investigaciones Biotecnológicas "Rodolfo Ugalde" (IIB), Universidad de San Martín (UNSAM) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Morten Nielsen
- Instituto de Investigaciones Biotecnológicas "Rodolfo Ugalde" (IIB), Universidad de San Martín (UNSAM) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.,Department of Health Technology, The Technical University of Denmark, Lyngby, Denmark
| | - Fernán Agüero
- Instituto de Investigaciones Biotecnológicas "Rodolfo Ugalde" (IIB), Universidad de San Martín (UNSAM) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
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Ehlers AM, Klinge M, Suer W, Weimann Y, Knulst AC, Besa F, Le TM, Otten HG. Ara h 7 isoforms share many linear epitopes: Are 3D epitopes crucial to elucidate divergent abilities? Clin Exp Allergy 2019; 49:1512-1519. [PMID: 31520442 PMCID: PMC6900131 DOI: 10.1111/cea.13496] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 08/16/2019] [Accepted: 09/03/2019] [Indexed: 12/11/2022]
Abstract
Background The peanut allergens Ara h 2, h 6, and h 7 are potent allergens and can trigger severe reactions. Ara h 7 consists of three isoforms differing in their ability to induce basophil degranulation, whereas the ability of Ara h 7.0201 is comparable to Ara h 2 and 6 as shown in previous literature. Objective To identify linear epitopes of Ara h 7.0101, Ara h 7.0201 and Ara h 7.0301 recognized by IgE and IgG4 from patients sensitized to Ara h 7 and to investigate their potential to elucidate divergent abilities of the Ara h 7 isoforms in inducing basophil activation. Methods Linear epitopes recognized by IgE and IgG4 were mapped by peptide microarray analysis containing 15‐mer peptides of Ara h 2.0201, 6, 7.0101, 7.0201 and 7.0301 and 39 peanut allergic patients sensitized to Ara h 7 (discovery). For validation, 20‐mer peptides containing the minimal epitope and surrounding amino acids were incubated with 25 sensitized patients and 10 controls (validation). Results Three out of 14 linear epitopes were unique for each isoform (Ara h 7.0101: aa 97‐109; Ara h 7.0201: aa 122‐133; Ara h 7.0301: aa 65‐74) but scarcely recognized by IgE. The main linear IgE epitope (aa 51‐57) located in the long flexible loop of all Ara h 7 isoforms was bound by antibodies from 31% of the patients (discovery and validation cohort). Regarding IgG4, 55% of the patients recognized an epitope present on all isoforms (aa 55‐65), whereas epitope aa 129‐137, only present on Ara h 7.0101/0.0301, was recognized by 38% of the patients. Recognition was highly individual, although 20% of the patients recognized any linear epitope neither by IgE nor by IgG4 despite a low mean z‐score of ≥ 1.7. Remarkably, only 50% of the patients recognized one or more epitopes by IgE. Conclusion & Clinical Relevance Ara h 7 isoforms share many linear epitopes being easily accessible for antibody binding. Unique epitopes, essential to elucidate divergent potencies, were scarcely recognized, suggesting a crucial involvement of conformational epitopes.
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Affiliation(s)
- Anna M Ehlers
- Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.,Department of Dermatology and Allergology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | | | | | | | - André C Knulst
- Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.,Department of Dermatology and Allergology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | | | - Thuy-My Le
- Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.,Department of Dermatology and Allergology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Henny G Otten
- Laboratory of Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
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Ponce M, Schroeder F, Bannert C, Schmidthaler K, Hansen CS, Lindholm Bøgh K, Soldo R, Tsui SK, Weinhäusel A, Szépfalusi Z, Eiwegger T. Preventive sublingual immunotherapy with House Dust Mite extract modulates epitope diversity in pre-school children. Allergy 2019; 74:780-787. [PMID: 30394551 DOI: 10.1111/all.13658] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 09/23/2018] [Accepted: 10/10/2018] [Indexed: 12/13/2022]
Abstract
BACKGROUND The preventive effect of allergen immunotherapy (AIT) on allergy and asthma development is currently assessed using primary and secondary AIT approaches. Knowledge of the immunological effects of these interventions is limited and the impact on epitope diversity remains to be defined. METHODS We used high-density peptide arrays that included all known Dermatophagoides pteronyssinus (Der p) and Dermatophagoides farinae (Der f) allergens and the whole proteome of Der f to study changes in House Dust Mite (HDM) linear peptide recognition during a 2-year preventive double-blind placebo-controlled sublingual HDM AIT pilot study in 2-5-year-old children with sensitization to HDM but without symptoms. RESULTS Preventive AIT-treated patients showed significantly higher IgG epitope diversity to HDM allergens compared to placebo-treated individuals at 24 months of treatment (P < 0.05), while no increase in IgE diversity was seen. At 24 months of treatment, IgG4 diversity for HDM allergens was significantly higher in the pAIT-treated patients compared to placebo group (P < 0.05). Potentially beneficial changes in epitope recognition throughout the treatment are also seen in peptides derived from Der f proteome. CONCLUSION These data suggest a beneficial immunomodulation of preventive sublingual immunotherapy at a molecular level by favoring a broader blocking repertoire and inhibiting epitope spreading.
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Affiliation(s)
- Marta Ponce
- Department of Paediatrics and Adolescent Medicine Medical University of Vienna Vienna Austria
| | - Fabian Schroeder
- Competence Unit for Molecular Diagnostics AIT, Austrian Institute of Technology Vienna Austria
| | - Christina Bannert
- Department of Paediatrics and Adolescent Medicine Medical University of Vienna Vienna Austria
| | - Klara Schmidthaler
- Department of Paediatrics and Adolescent Medicine Medical University of Vienna Vienna Austria
| | | | | | - Regina Soldo
- Competence Unit for Molecular Diagnostics AIT, Austrian Institute of Technology Vienna Austria
| | - Stephen Kwok‐Wing Tsui
- Hong Kong Bioinformatics Centre Chinese University of Hong Kong Hong Kong China
- School of Biomedical Sciences Chinese University of Hong Kong Hong Kong China
| | - Andreas Weinhäusel
- Competence Unit for Molecular Diagnostics AIT, Austrian Institute of Technology Vienna Austria
| | - Zsolt Szépfalusi
- Department of Paediatrics and Adolescent Medicine Medical University of Vienna Vienna Austria
| | - Thomas Eiwegger
- Department of Paediatrics and Adolescent Medicine Medical University of Vienna Vienna Austria
- Program in Translational Medicine The Hospital for Sick Children Toronto Ontario Canada
- Department of Immunology The University of Toronto Toronto Ontario Canada
- Division of Immunology and Allergy Food allergy and Anaphylaxis Program The Department of Paediatrics The Hospital for Sick Children Toronto Ontario Canada
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Grillberger R, Casina VC, Turecek PL, Zheng XL, Rottensteiner H, Scheiflinger F. Anti-ADAMTS13 IgG autoantibodies present in healthy individuals share linear epitopes with those in patients with thrombotic thrombocytopenic purpura. Haematologica 2014; 99:e58-60. [PMID: 24532042 DOI: 10.3324/haematol.2013.100685] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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Oezguen N, Zhou B, Negi SS, Ivanciuc O, Schein CH, Labesse G, Braun W. Comprehensive 3D-modeling of allergenic proteins and amino acid composition of potential conformational IgE epitopes. Mol Immunol 2008; 45:3740-7. [PMID: 18621419 PMCID: PMC2593650 DOI: 10.1016/j.molimm.2008.05.026] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2008] [Revised: 05/28/2008] [Accepted: 05/29/2008] [Indexed: 11/21/2022]
Abstract
Similarities in sequences and 3D structures of allergenic proteins provide vital clues to identify clinically relevant immunoglobulin E (IgE) cross-reactivities. However, experimental 3D structures are available in the Protein Data Bank for only 5% (45/829) of all allergens catalogued in the Structural Database of Allergenic Proteins (SDAP, http://fermi.utmb.edu/SDAP). Here, an automated procedure was used to prepare 3D-models of all allergens where there was no experimentally determined 3D structure or high identity (95%) to another protein of known 3D structure. After a final selection by quality criteria, 433 reliable 3D models were retained and are available from our SDAP Website. The new 3D models extensively enhance our knowledge of allergen structures. As an example of their use, experimentally derived "continuous IgE epitopes" were mapped on 3 experimentally determined structures and 13 of our 3D-models of allergenic proteins. Large portions of these continuous sequences are not entirely on the surface and therefore cannot interact with IgE or other proteins. Only the surface exposed residues are constituents of "conformational IgE epitopes" which are not in all cases continuous in sequence. The surface exposed parts of the experimental determined continuous IgE epitopes showed a distinct statistical distribution as compared to their presence in typical protein-protein interfaces. The amino acids Ala, Ser, Asn, Gly and particularly Lys have a high propensity to occur in IgE binding sites. The 3D-models will facilitate further analysis of the common properties of IgE binding sites of allergenic proteins.
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Affiliation(s)
- Numan Oezguen
- Department of Biochemistry and Molecular Biology and Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, Texas 77555-0857, USA
| | - Bin Zhou
- Current address: Genomics Institute of the Novartis Research Foundation, 10675 John Jay Hopkins Drive San Diego, CA 92121, USA
| | - Surendra S. Negi
- Department of Biochemistry and Molecular Biology and Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, Texas 77555-0857, USA
| | - Ovidiu Ivanciuc
- Department of Biochemistry and Molecular Biology and Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, Texas 77555-0857, USA
| | - Catherine H. Schein
- Department of Biochemistry and Molecular Biology and Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, Texas 77555-0857, USA
- Department of Microbiology and Immunology, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555-0857, USA
| | - Gilles Labesse
- CNRS-Universités Montpellier 1 & 2, UMR5048, Centre de Biochimie Structurale, 29, Rue de Navacelles, F-34090 Montpellier Cedex, France
- INSERM U554, Centre de Biochimie Structurale, 29, Rue de Navacelles, F-34090 Montpellier Cedex, France
| | - Werner Braun
- Department of Biochemistry and Molecular Biology and Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, Texas 77555-0857, USA
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Cheng HM, Foong YT, AbuSamah AJ, Dillner J, Sam CK, Prasad U. Linear epitopes of the replication-activator protein of Epstein-Barr virus recognised by specific serum IgG in nasopharyngeal carcinoma. Cancer Immunol Immunother 1995; 40:251-6. [PMID: 7750123 PMCID: PMC11037714 DOI: 10.1007/bf01519899] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/1994] [Accepted: 01/10/1995] [Indexed: 01/26/2023]
Abstract
The linear antigenic epitopes of the Epstein-Barr virus replication activator protein (ZEBRA), recognised by specific serum IgG in nasopharyngeal carcinoma (NPC), were determined. This was achieved by synthesizing the entire amino acid sequence of ZEBRA as a set of 29, 22-residue peptides with an overlap of 14 amino acids. The ZEBRA peptides were tested in enzyme-linked immunosorbent assay (ELISA) for IgG binding in sera from 37 selected NPC patients who had IgG antibodies to the native ZEBRA protein. The most immunogenic epitope was peptide 1 at the amino-terminal end with 36 of the sera reactive against it. Further analysis of peptide 1, using the multipin peptide-scanning technique, defined a 10-amino-acid sequence FTPDPYQVPF, which was strongly bound by IgG. Two other regions of ZEBRA were also identified as immunodominant IgG epitopes, namely peptide 11 (amino acids 82-103) and peptide 19/20 (amino acids 146-175) with 8-13 of the NPC sera reactive against the peptides. The number of peptides reactive with individual NPC serum varies from 1 to 6 or more and there is some correlation between a greater number of peptide (at least 4) bound and a higher (at least 1:40) titre of serum IgA to viral capsid antigen. The immunodominant ZEBRA peptide 1 could be utilised in IgG ELISA for the detection of NPC.
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Affiliation(s)
- H M Cheng
- Nasopharyngeal Carcinoma Research Laboratory, University of Malaya, Kuala, Lumpur
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