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Franciskovic E, Thörnqvist L, Greiff L, Gasset M, Ohlin M. Linear epitopes of bony fish β-parvalbumins. Front Immunol 2024; 15:1293793. [PMID: 38504976 PMCID: PMC10948427 DOI: 10.3389/fimmu.2024.1293793] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 02/13/2024] [Indexed: 03/21/2024] Open
Abstract
Introduction Fish β-parvalbumins are common targets of allergy-causing immunity. The nature of antibody responses to such allergens determines the biological outcome following exposure to fish. Specific epitopes on these allergens recognised by antibodies are incompletely characterised. Methods High-content peptide microarrays offer a solution to the identification of linear epitopes recognised by antibodies. We characterized IgG and IgG4 recognition of linear epitopes of fish β-parvalbumins defined in the WHO/IUIS allergen database as such responses hold the potential to counter an allergic reaction to these allergens. Peripheral blood samples, collected over three years, of 15 atopic but not fish-allergic subjects were investigated using a microarray platform that carried every possible 16-mer peptide of known isoforms and isoallergens of these and other allergens. Results Interindividual differences in epitope recognition patterns were observed. In contrast, reactivity patterns in a given individual were by comparison more stable during the 3 years-course of the study. Nevertheless, evidence of the induction of novel specificities over time was identified across multiple regions of the allergens. Particularly reactive epitopes were identified in the D helix of Cyp c 1 and in the C-terminus of Gad c 1 and Gad m 1.02. Residues important for the recognition of certain linear epitopes were identified. Patterns of differential recognition of isoallergens were observed in some subjects. Conclusions Altogether, comprehensive analysis of antibody recognition of linear epitopes of multiple allergens enables characterisation of the nature of the antibody responses targeting this important set of food allergens.
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Affiliation(s)
| | | | - Lennart Greiff
- Department of Otorhinolaryngology, Head & Neck Surgery, Skåne University Hospital, Lund, Sweden
- Department of Clinical Sciences, Lund University, Lund, Sweden
| | - Maria Gasset
- Institute of Physical-Chemistry Blas Cabrera, Spanish National Research Council, Madrid, Spain
| | - Mats Ohlin
- Department of Immunotechnology, Lund University, Lund, Sweden
- SciLifeLab, Lund University, Lund, Sweden
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Qiu H, Duan W, Hu W, Wei S, Liu Y, Sun Q, Wang Z, Han Z, Liu Y, Liu S. Insight into the allergenicity and structure changes of parvalbumin from Trachinotus ovatus induced by dense-phase carbon dioxide. Int J Biol Macromol 2024; 260:129582. [PMID: 38246469 DOI: 10.1016/j.ijbiomac.2024.129582] [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: 08/26/2023] [Revised: 12/31/2023] [Accepted: 01/16/2024] [Indexed: 01/23/2024]
Abstract
Parvalbumin (PV) is a major allergen in fish, and traditional treatments cannot reduce its sensitization. The effects of dense-phase carbon dioxide (DPCD) treatment on the sensitization and spatial structure of PV in Trachinotus ovatus were evaluated in this study. Western blotting and indirect ELISA were used to determine the allergenicity changes and spatial conformations of PV treated by DPCD. Tris-tricine-SDS-PAGE, circular dichroism, surface hydrophobicity, endogenous fluorescence, UV spectrophotometry, free amino group, total sulfhydryl group and SEM analyses were applied to characterize PV structure. The results showed that DPCD treatment (15 MPa, 30 min, 50 °C) could reduce PV-induced allergic reactions by 39-41 %, which destroyed the normal conformational epitopes and reduced the risk of PV-induced allergy. The secondary structure changed from ordered to disordered with a decreased content of α-helical groups, while the internal hydrophobic groups were exposed. The total sulfhydryl group content decreased significantly (P < 0.05). The surface hydrophobicity and ultraviolet absorption spectrum were enhanced, and the endogenous fluorescence peak shifted to a long wavelength. Meanwhile, the content of free amino groups increased significantly (P < 0.05). This study could provide a theoretical basis and a promising technical approach for reduction of PV allergenicities.
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Affiliation(s)
- Hui Qiu
- College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Zhanjiang 524088, China
| | - Weiwen Duan
- College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Zhanjiang 524088, China
| | - Weicheng Hu
- College of Medicine, Yangzhou University, Yangzhou 225109, China
| | - Shuai Wei
- College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Zhanjiang 524088, China; Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian 116034, China.
| | - Yanan Liu
- College of Medicine, Yangzhou University, Yangzhou 225109, China
| | - Qinxiu Sun
- College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Zhanjiang 524088, China
| | - Zefu Wang
- College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Zhanjiang 524088, China
| | - Zongyuan Han
- College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Zhanjiang 524088, China
| | - Yang Liu
- College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Zhanjiang 524088, China
| | - Shucheng Liu
- College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Seafood, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Zhanjiang 524088, China; Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian 116034, China.
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Huang Y, Li Z, Wu Y, Li Y, Pramod S, Chen G, Zhu W, Zhang Z, Wang H, Lin H. Comparative analysis of allergenicity and predicted linear epitopes in α and β parvalbumin from turbot (Scophthalmus maximus). J Sci Food Agric 2023; 103:2313-2324. [PMID: 36606403 DOI: 10.1002/jsfa.12432] [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] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 12/19/2022] [Accepted: 01/06/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND Parvalbumin (PV) can be subdivided into two phylogenetic lineages, αPV and βPV. The bony fish βPV is considered a major fish allergen. However, there is no available report on the immunological property and epitope mapping of bony fish αPV. RESULTS To characterize the allergenic property of bony fish αPV and investigate the difference in allergenic property of bony fish αPV and βPV, turbot (Scophthalmus maximus) αPV and βPV were identified by mass spectrometry and were expressed in Escherichia coli system in this study. Spectra analysis and three-dimensional (3D) modeling showed the similar structure between αPV and βPV. However, αPV exhibited lower immunoglobulin E/immunoglobulin G (IgE/IgG) binding capacity than βPV. Three identified βPV epitopes possessed higher IgE reactivity and more hydrophobic residues than three identified αPV epitopes. In addition, less similarity in sequence homology of αPV epitopes was observed with allergen sequences in database. CONCLUSION These finding expanded information on fish PV epitopes and substantiated the difference in allergenicity and epitope mapping between fish αPV and βPV, which will improve the epitope-based detection tools of PV and diagnostic of PV induced fish allergy. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Yuhao Huang
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
| | - Zhenxing Li
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
| | - Yeting Wu
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
| | - Yonghong Li
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
- Department of Research and Development, HOB Biotech Group Corp., Ltd, Suzhou, P. R. China
| | - Siddanakoppalu Pramod
- Department of Studies and Research in Biochemistry, Davangere University, Davangere, India
| | - Guanzhi Chen
- Department of Dermatology, Affiliated Hospital of Medical College Qingdao University, Qingdao, P. R. China
| | - Wenjia Zhu
- Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, P. R. China
| | - Ziye Zhang
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
| | - Hao Wang
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
| | - Hong Lin
- College of Food Science and Engineering, Ocean University of China, Qingdao, P. R. China
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4
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Abstract
Fish is one of the most common foods that cause allergic reactions. The study of cross-reactivity among fishes using mass spectrometry (MS) is still limited. We developed a strategy using microfluidic chips coupled with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) to evaluate cross-reactivity among fishes. The protocol employed commercial magnetic beads functionalized with anti-human IgE antibodies to carry out the IgEs immunomagnetic separation in blood samples, followed by the capture of allergens from seafood protein extracts in a single-straight microfluidic channel. After elution, the captured allergens were digested and identified by MALDI-TOF MS and high-performance liquid chromatography-tandem mass spectrometry and validated by enzyme-linked immunosorbent assay (ELISA). An investigation of the reproducibility revealed that the protocol can sense well the allergens in a food matrix. Seven fish species were analyzed to evaluate the allergic cross-reactivity among fishes. The commercial ELISA test gave consistent results with the presently developed strategy when the same allergenicity test was performed. Parvalbumins were detected from five of the seven analyzed fishes. The sequence alignment of parvalbumins revealed that the similarity of parvalbumins identified from the analyzed fishes is larger than 64%. Boiling may reduce the allergenicity of fish, as demonstrated by a marginal diminish in the parvalbumin content of crucian carp (Carassius carassius) muscle when boiling with water. The method can potentially be used to predict allergic cross-reactivity among fish species, provide advice and guidance to individuals with a history of seafood allergy, and ensure food safety in the food allergy community.
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Affiliation(s)
- Xin Zhao
- College of Food Science and Engineering, Shanghai Ocean University, Hucheng Ring Road 999, Pudong New District, Shanghai 201306, China
| | - Hongyan Bi
- College of Food Science and Engineering, Shanghai Ocean University, Hucheng Ring Road 999, Pudong New District, Shanghai 201306, China
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Vologzhannikova AA, Shevelyova MP, Kazakov AS, Sokolov AS, Borisova NI, Permyakov EA, Kircheva N, Nikolova V, Dudev T, Permyakov SE. Strontium Binding to α-Parvalbumin, a Canonical Calcium-Binding Protein of the "EF-Hand" Family. Biomolecules 2021; 11:biom11081158. [PMID: 34439824 PMCID: PMC8392015 DOI: 10.3390/biom11081158] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 07/30/2021] [Accepted: 07/31/2021] [Indexed: 02/07/2023] Open
Abstract
Strontium salts are used for treatment of osteoporosis and bone cancer, but their impact on calcium-mediated physiological processes remains obscure. To explore Sr2+ interference with Ca2+ binding to proteins of the EF-hand family, we studied Sr2+/Ca2+ interaction with a canonical EF-hand protein, α-parvalbumin (α-PA). Evaluation of the equilibrium metal association constants for the active Ca2+ binding sites of recombinant human α-PA (‘CD’ and ‘EF’ sites) from fluorimetric titration experiments and isothermal titration calorimetry data gave 4 × 109 M−1 and 4 × 109 M−1 for Ca2+, and 2 × 107 M−1 and 2 × 106 M−1 for Sr2+. Inactivation of the EF site by homologous substitution of the Ca2+-coordinating Glu in position 12 of the EF-loop by Gln decreased Ca2+/Sr2+ affinity of the protein by an order of magnitude, whereas the analogous inactivation of the CD site induced much deeper suppression of the Ca2+/Sr2+ affinity. These results suggest that Sr2+ and Ca2+ bind to CD/EF sites of α-PA and the Ca2+/Sr2+ binding are sequential processes with the CD site being occupied first. Spectrofluorimetric Sr2+ titration of the Ca2+-loaded α-PA revealed presence of secondary Sr2+ binding site(s) with an apparent equilibrium association constant of 4 × 105 M−1. Fourier-transform infrared spectroscopy data evidence that Ca2+/Sr2+-loaded forms of α-PA exhibit similar states of their COO− groups. Near-UV circular dichroism (CD) data show that Ca2+/Sr2+ binding to α-PA induce similar changes in symmetry of microenvironment of its Phe residues. Far-UV CD experiments reveal that Ca2+/Sr2+ binding are accompanied by nearly identical changes in secondary structure of α-PA. Meanwhile, scanning calorimetry measurements show markedly lower Sr2+-induced increase in stability of tertiary structure of α-PA, compared to the Ca2+-induced effect. Theoretical modeling using Density Functional Theory computations with Polarizable Continuum Model calculations confirms that Ca2+-binding sites of α-PA are well protected against exchange of Ca2+ for Sr2+ regardless of coordination number of Sr2+, solvent exposure or rigidity of sites. The latter appears to be a key determinant of the Ca2+/Sr2+ selectivity. Overall, despite lowered affinity of α-PA to Sr2+, the latter competes with Ca2+ for the same EF-hands and induces similar structural rearrangements. The presence of a secondary Sr2+ binding site(s) could be a factor contributing to Sr2+ impact on the functional activity of proteins.
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Affiliation(s)
- Alisa A. Vologzhannikova
- Institute for Biological Instrumentation, Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Pushchino, 142290 Moscow, Russia; (A.A.V.); (M.P.S.); (A.S.K.); (A.S.S.); (N.I.B.); (E.A.P.)
| | - Marina P. Shevelyova
- Institute for Biological Instrumentation, Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Pushchino, 142290 Moscow, Russia; (A.A.V.); (M.P.S.); (A.S.K.); (A.S.S.); (N.I.B.); (E.A.P.)
| | - Alexey S. Kazakov
- Institute for Biological Instrumentation, Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Pushchino, 142290 Moscow, Russia; (A.A.V.); (M.P.S.); (A.S.K.); (A.S.S.); (N.I.B.); (E.A.P.)
| | - Andrey S. Sokolov
- Institute for Biological Instrumentation, Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Pushchino, 142290 Moscow, Russia; (A.A.V.); (M.P.S.); (A.S.K.); (A.S.S.); (N.I.B.); (E.A.P.)
| | - Nadezhda I. Borisova
- Institute for Biological Instrumentation, Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Pushchino, 142290 Moscow, Russia; (A.A.V.); (M.P.S.); (A.S.K.); (A.S.S.); (N.I.B.); (E.A.P.)
| | - Eugene A. Permyakov
- Institute for Biological Instrumentation, Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Pushchino, 142290 Moscow, Russia; (A.A.V.); (M.P.S.); (A.S.K.); (A.S.S.); (N.I.B.); (E.A.P.)
| | - Nikoleta Kircheva
- Institute of Optical Materials and Technologies “Acad. J. Malinowski”, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;
| | - Valya Nikolova
- Faculty of Chemistry and Pharmacy, Sofia University “St. Kl. Ohridski”, 1164 Sofia, Bulgaria; (V.N.); (T.D.)
| | - Todor Dudev
- Faculty of Chemistry and Pharmacy, Sofia University “St. Kl. Ohridski”, 1164 Sofia, Bulgaria; (V.N.); (T.D.)
| | - Sergei E. Permyakov
- Institute for Biological Instrumentation, Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Pushchino, 142290 Moscow, Russia; (A.A.V.); (M.P.S.); (A.S.K.); (A.S.S.); (N.I.B.); (E.A.P.)
- Correspondence: ; Tel.: +7-(4967)-143-7741
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6
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Abstract
Insights into the structure and dynamics of large biological systems has been greatly improved by two concurrent NMR approaches: the application of transverse relaxation-optimized spectroscopy (TROSY) techniques in multi-dimensional NMR, especially the methyl-TROSY, and the resurgence of 19F NMR using trifluoromethyl (CF3) probes. Herein we investigate the feasibility of combining these approaches into a trifluoromethyl-TROSY experiment. Using a CF3-labelled parvalbumin, we have evaluated the natural abundance 13C-19F correlation spectra and find no indication of a CF3 TROSY at high magnetic fields.
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Affiliation(s)
- Brittney A Klein
- Department of Biochemistry, University of Alberta, Edmonton, AB, T6G2H7, Canada
| | - Brian D Sykes
- Department of Biochemistry, University of Alberta, Edmonton, AB, T6G2H7, Canada.
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Tian S, Ma J, Ahmed I, Lv L, Li Z, Lin H. Effect of tyrosinase-catalyzed crosslinking on the structure and allergenicity of turbot parvalbumin mediated by caffeic acid. J Sci Food Agric 2019; 99:3501-3508. [PMID: 30623428 DOI: 10.1002/jsfa.9569] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [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: 06/23/2018] [Revised: 11/08/2018] [Accepted: 01/04/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Enzymatic treatment of allergenic protein can alter their functional properties under a mild reaction condition due to specificity of enzymes. Phenolic compounds act as mediators and enhance the crosslinking reactions. The study aimed to assess the changes in the structure and immunoglobulin G (IgG) binding capacity of turbot parvalbumin (PV) upon crosslinking with tyrosinase (Tyr) in the absence and presence of caffeic acid. RESULTS Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis revealed the appearance of higher molecular weight bands (24, 36 kDa) in the crosslinked PV. The secondary structure of crosslinked PV became loosened and disordered. The results of intrinsic fluorescence and ultraviolet absorption spectral analyses, as well as surface hydrophobicity and free amino group analyses also revealed structural changes. As observed by western blot analysis, the intensity of the PV bands reduced upon Tyr treatment, indicating reduced binding of specific IgG to PV. Moreover, the indirect ELISA (enzyme-linked immunosorbent assay) analysis confirmed that the IgG binding ability of crosslinked PV was reduced 34.94%. CONCLUSION Enzymatic treatment mitigated the allergenicity of fish PV, which was closely related to the alterations in the conformational structure. This treatment showed potential for developing hypoallergenic fish products under mild reaction conditions. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Shenglan Tian
- Food Safety Laboratory, College of Food Science and Engineering, Ocean University of China, Ocean University of China, Qingdao, PR China
| | - Jiaju Ma
- Food Safety Laboratory, College of Food Science and Engineering, Ocean University of China, Ocean University of China, Qingdao, PR China
| | - Ishfaq Ahmed
- Food Safety Laboratory, College of Food Science and Engineering, Ocean University of China, Ocean University of China, Qingdao, PR China
| | - Liangtao Lv
- Food Safety Laboratory, College of Food Science and Engineering, Ocean University of China, Ocean University of China, Qingdao, PR China
| | - Zhenxing Li
- Food Safety Laboratory, College of Food Science and Engineering, Ocean University of China, Ocean University of China, Qingdao, PR China
| | - Hong Lin
- Food Safety Laboratory, College of Food Science and Engineering, Ocean University of China, Ocean University of China, Qingdao, PR China
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8
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Abstract
Early diagnosis, noninvasive detection, and staging of various diseases, remain one of the major clinical barriers to effective medical treatment and prevention of disease progression toward major clinical consequences. Molecular imaging technologies play an indispensable role in the clinical field in overcoming these major barriers. The increasing application of imaging techniques and agents in early detection of different diseases such as cancer has resulted in improved treatment response and clinical patient management. In this chapter we will first introduce criteria for the design and engineering of calcium-binding protein (CaBP) parvalbumin as a protein Gd-MRI contrast agent (ProCA) with unprecedented metal selectivity for Gd3+ over physiological metal ions. We will then discuss the further development of targeted MRI contrast agent for molecular imaging of PSMA biomarker for early detection of prostate cancer.
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Affiliation(s)
- Mani Salarian
- Department of Chemistry, Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, USA
| | - Shenghui Xue
- Department of Chemistry, Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, USA
- Inlighta Biosciences, Atlanta, GA, USA
| | - Oluwatosin Y Ibhagui
- Department of Chemistry, Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, USA
| | - Jenny J Yang
- Department of Chemistry, Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, GA, USA.
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Yang RQ, Chen YL, Chen F, Wang H, Zhang Q, Liu GM, Jin T, Cao MJ. Purification, Characterization, and Crystal Structure of Parvalbumins, the Major Allergens in Mustelus griseus. J Agric Food Chem 2018; 66:8150-8159. [PMID: 29969026 DOI: 10.1021/acs.jafc.8b01889] [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] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Fish play important roles in human nutrition and health, but also trigger allergic reactions in some population. Parvalbumin (PV) represents the major allergen of fish. While IgE cross-reactivity to PV in various bony fish species has been well characterized, little information is available about allergens in cartilaginous fish. In this study, two shark PV isoforms (named as SPV-I and SPV-II) from Mustelus griseus were purified. Their identities were further confirmed by mass spectroscopic analysis. IgE immunoblot analysis showed that sera from fish-allergic patients reacted to both SPV-I and SPV-II, but the majority of sera reacted more intensely to SPV-I than SPV-II. Thermal denaturation monitored by CD spectrum showed that both of the SPV allergens are highly thermostable. SPV-I maintained its IgE-binding capability after heat denaturation, while the IgE-binding capability of SPV-II was reduced. The results of crystal structure showed that SPV-I and SPV-II were similar in their overall tertiary structure, but their amino acid sequences shared lower similarities, indicating that the differences in the IgE-binding capabilities of SPV-I and SPV-II might be due to differential antigen epitopes in these two isoforms.
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Affiliation(s)
- Ru-Qing Yang
- College of Food and Biological Engineering , Jimei University , Xiamen , Fujian 361021 , China
| | - Yu-Lei Chen
- College of Food and Biological Engineering , Jimei University , Xiamen , Fujian 361021 , China
| | - Feng Chen
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences and Medical Center , University of Science & Technology of China , Hefei 230007 , China
| | - Heqiao Wang
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences and Medical Center , University of Science & Technology of China , Hefei 230007 , China
| | - Qian Zhang
- College of Food and Biological Engineering , Jimei University , Xiamen , Fujian 361021 , China
| | - Guang-Ming Liu
- College of Food and Biological Engineering , Jimei University , Xiamen , Fujian 361021 , China
- Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources , Xiamen , Fujian 361100 , China
| | - Tengchuan Jin
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences and Medical Center , University of Science & Technology of China , Hefei 230007 , China
| | - Min-Jie Cao
- College of Food and Biological Engineering , Jimei University , Xiamen , Fujian 361021 , China
- Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources , Xiamen , Fujian 361100 , China
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10
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Abstract
Amyloid formation is basically featured by a protein-protein interaction in which the reacting regions are the segments assembling into cross β-sheets. To identify these segments both theoretical and experimental tools have been developed. Here, we focus on the use of peptide arrays to probe the binding of several amyloid-specific probes such as the OC and A11 anti-amyloid conformation-selective antibodies and of monomers and preformed fibrils. These arrays use libraries containing partly overlapping peptides derived from the sequence of Gad m 1, the major allergen from Atlantic cod, which forms amyloids under gastrointestinal relevant conditions.
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Affiliation(s)
- Rosa Sánchez
- Institute of Physical Chemistry "Rocasolano", Spanish National Research Council (CSIC), Madrid, Spain
| | - Javier Martínez
- Institute of Physical Chemistry "Rocasolano", Spanish National Research Council (CSIC), Madrid, Spain
- Faculdade de Ciências, Departamento de Química e Bioquímica, Biosystems and Integrative Sciences Institute, Universidade de Lisboa, Lisbon, Portugal
- Departamento de Química e Bioquímica, Universidade de Lisboa, Lisbon, Portugal
| | - Laura Montoya
- Institute of Physical Chemistry "Rocasolano", Spanish National Research Council (CSIC), Madrid, Spain
| | | | - Maria Gasset
- Institute of Physical Chemistry "Rocasolano", Spanish National Research Council (CSIC), Madrid, Spain.
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11
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Denesyuk AI, Permyakov SE, Johnson MS, Permyakov EA, Denessiouk K. Building kit for metal cation binding sites in proteins. Biochem Biophys Res Commun 2017; 494:311-317. [PMID: 29017922 DOI: 10.1016/j.bbrc.2017.10.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 09/28/2017] [Accepted: 10/06/2017] [Indexed: 11/17/2022]
Abstract
Starting with conformations of calcium-binding sites in parvalbumin and integrin (representative structures of EF-hand and calcium blade zones, respectively) we introduce four new different local Ca2+-recognition units in proteins: a one-residue unit type I (ORI); a three-residue unit type I (TRI); a one-residue unit type II (ORII) and a three-residue unit type II (TRII). Based on the amount and nature of variable atoms, the type I and II units theoretically can have four and twelve variants, respectively. Analysis of known "Ca2+-bound functional niches" in proteins revealed presence of almost all possible variants of Ca2+-recognition units in actual structures. Parvalbumin, integrin alpha-IIb and sixteen other proteins with different Ca2+-bound functional niches contain various consecutively joined combinations of OR(I/II) and TR(I/II) units. Such a OR(I/II)+TR(I/II) joint unit forms a tripeptide, which uses three main-chain atoms for metal binding: nitrogenn (Donor), oxygenn (Acceptor) and nitrogenn+2 (Donor). Thus, taken together, the described ORI, TRI, ORII and TRII units can serve as elementary blocks to construct more complex calcium recognizing substructures in a variety of calcium binding sites of unrelated proteins.
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Affiliation(s)
- Alexander I Denesyuk
- Faculty of Science and Engineering, Åbo Akademi University, Turku 20500, Finland; Institute for Biological Instrumentation of the Russian Academy of Sciences, Pushchino 142290, Russia.
| | - Sergei E Permyakov
- Institute for Biological Instrumentation of the Russian Academy of Sciences, Pushchino 142290, Russia
| | - Mark S Johnson
- Faculty of Science and Engineering, Åbo Akademi University, Turku 20500, Finland
| | - Eugene A Permyakov
- Institute for Biological Instrumentation of the Russian Academy of Sciences, Pushchino 142290, Russia
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Kumeta H, Nakayama H, Ogura K. Solution structure of the major fish allergen parvalbumin Sco j 1 derived from the Pacific mackerel. Sci Rep 2017; 7:17160. [PMID: 29215073 PMCID: PMC5719450 DOI: 10.1038/s41598-017-17281-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 11/22/2017] [Indexed: 11/21/2022] Open
Abstract
Although fish is an important part of the human diet, it is also a common source of food allergy. The major allergen in fish is parvalbumin, a well-conserved Ca2+-binding protein found in the white muscle of many fish species. Here, we studied the solution structure of the parvalbumin Sco j 1, derived from the Pacific mackerel, using nuclear magnetic resonance spectroscopy. We mapped the IgE-binding epitope proposed in a recent study onto the present structure. Interestingly, three of four residues, which were elucidated as key residues of the IgE-binding epitope, were exposed to solvent, whereas one residue faced the inside of the molecule. We expect that this solution structure can be used in future studies attempting to analyze the various IgE-binding modes of these allergens.
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Affiliation(s)
- Hiroyuki Kumeta
- Global Station for Soft Matter, Global Institution for Collaborative Research and Education, Hokkaido University, Kita 21 Nishi 11, Kita, Sapporo, 0110021, Japan
| | - Haruka Nakayama
- Laboratory of Biomolecular Functionalities, Department of Food Science, Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, 1-308 Suematsu, Nonoichi, Ishikawa, 9218836, Japan
| | - Kenji Ogura
- Laboratory of Biomolecular Functionalities, Department of Food Science, Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, 1-308 Suematsu, Nonoichi, Ishikawa, 9218836, Japan.
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13
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Kobayashi A, Ichimura A, Kobayashi Y, Shiomi K. IgE-binding epitopes of various fish parvalbumins exist in a stereoscopic conformation maintained by Ca(2+) binding. Allergol Int 2016; 65:345-8. [PMID: 27184826 DOI: 10.1016/j.alit.2016.02.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 01/28/2016] [Accepted: 02/08/2016] [Indexed: 11/28/2022] Open
Affiliation(s)
- Ayako Kobayashi
- Department of Food Science and Technology, Tokyo University of Marine Science and Technology, Tokyo, Japan
| | - Ayako Ichimura
- Department of Food Science and Technology, Tokyo University of Marine Science and Technology, Tokyo, Japan
| | - Yukihiro Kobayashi
- Department of Marine Biosciences, Tokyo University of Marine Science and Technology, Tokyo, Japan; Course of Safety Management in Food Supply Chain, Tokyo University of Marine Science and Technology, Tokyo, Japan.
| | - Kazuo Shiomi
- Department of Food Science and Technology, Tokyo University of Marine Science and Technology, Tokyo, Japan
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14
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de Jongh HHJ, de los Reyes Jimenez M, Baumert JL, Taylor SL, Koppelman SJ. Electrophoretic Behavior in Relation to the Structural Integrity of Codfish Parvalbumin upon Heat Treatment. J Agric Food Chem 2015; 63:4683-4689. [PMID: 25880570 DOI: 10.1021/jf505990h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 06/04/2023]
Abstract
This work evaluates the impact of heat processing of parvalbumin, a major fish allergen, on the consequences for quantitative analysis of this protein embedded in different matrices during heating (either isolated, in an aqueous extract, or in whole fillets) to assess potential health risks. It is shown that oligomerization of parvalbumin does occur, but only upon heat treatment above 80 °C. This coincides with the ability of the isolated protein to refold up to this temperature in a fully reversible way, as demonstrated by circular dichroism analysis. In autoclaved samples a disintegration of the protein structure is observed. The situation becomes different when parvalbumin is embedded in a matrix with other constituents, as in fish extracts or whole fillets. The electrophoretic analysis of parvalbumin (SDS-PAGE and immunoblotting) is largely determined by complexation with other proteins resulting in insoluble materials caused by the partial unfolding of the parvalbumin at elevated temperatures. This effect is more strongly observed for cod fish extract, compared to whole cod fillets, as in the latter situation the integrity of the tissue hampers this interprotein complexation. Moreover, it is shown by ELISA analysis of heat-treated samples that using blotting procedures where disintegration of complexes may be promoted, restoring some of the IgG-binding propensity, may provide false outcomes. It was concluded that antibody binding to parvalbumin is dominated by the potential to form heat-induced complexes with other proteins. The possibly less-soluble or extractable character of these complexes may provide confusing information regarding potential health risks of fish and fish protein-containing food composites when such heat-treated samples are analyzed by immunochemical assays.
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Affiliation(s)
| | | | - Joseph L Baumert
- §Food Allergy Research and Resource Program, Food Science and Technology, University of Nebraska-Lincoln, Lincoln, Nebraska 68583, United States
| | - Steve L Taylor
- §Food Allergy Research and Resource Program, Food Science and Technology, University of Nebraska-Lincoln, Lincoln, Nebraska 68583, United States
| | - Stef J Koppelman
- §Food Allergy Research and Resource Program, Food Science and Technology, University of Nebraska-Lincoln, Lincoln, Nebraska 68583, United States
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15
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Li Z, You J, Luo Y, Wu J. Purification and characterization of parvalbumin isotypes from grass carp (Ctenopharyngodon idella). J Agric Food Chem 2014; 62:6212-6218. [PMID: 24866418 DOI: 10.1021/jf500817f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [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: 06/03/2023]
Abstract
The prevalence of fish allergy is rapidly increasing because of a growing fish consumption driven mainly by a positive image of the fish and health relationship. The purpose of this study was to characterize parvalbumin isotypes from grass carp (Ctenopharyngodon idella), one of the most frequently consumed freshwater fish in China. Three parvalbumin isotypes were purified using consecutive gel filtration and reverse-phase chromatography and denoted as PVI, PVII, and PVIII. The molecular weights of the isotypes were determined to be 11.968, 11.430, and 11.512 kDa, respectively. PVI showed 74% matched amino acids sequence with PV isotype 4a from Danio rerio, while PVII and PVIII showed 46% matched amino acids sequence with PV isotypes from Hypophthalmichthys molitrix. PVII is the dominant allergen, but it was liable to gastrointestinal enzymes as PVIII; however, PVI was resistant to pepsin digestion. A further study is to characterize the epitopes of PVII, the dominant allergen.
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Affiliation(s)
- Zheng Li
- Beijing Higher Institution Engineering Research Center of Animal Product, College of Food Science and Nutritional Engineering, China Agricultural University , Beijing 100083, People's Republic of China
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16
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Sharp MF, Kamath SD, Koeberl M, Jerry DR, O'Hehir RE, Campbell DE, Lopata AL. Differential IgE binding to isoallergens from Asian seabass (Lates calcarifer) in children and adults. Mol Immunol 2014; 62:77-85. [PMID: 24973736 DOI: 10.1016/j.molimm.2014.05.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [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: 12/02/2013] [Revised: 05/21/2014] [Accepted: 05/25/2014] [Indexed: 11/17/2022]
Abstract
Fish allergy is a common food allergy, with prevalence rates in the general population ranging between 0.2% and 2.3%. In both adults and children fish ranks in the top eight foods known to cause IgE mediated food allergy. Fish allergy is rarely outgrown and individuals with fish allergy may be allergic to some but not all species of fish. Whilst fish allergy occurs around the world, the characterization of allergenic components of individual species of fish has been largely confined to Northern hemisphere and European fish species. To date allergy to commonly consumed fish in the Asian-Pacific region including barramundi (Asian seabass; Lates calcarifer) have been less well investigated. The aim of this study was to identify and characterize allergenic proteins from barramundi in both fish allergic adult and pediatric patients. Serum from 17 fish allergic adults and children from Australia were characterized by immunoblotting and enzyme linked immunosorbent assays (ELISA) against raw and heated barramundi. Molecular analysis of identified allergens included genetic sequencing and generation of recombinant isoallergens. Two novel parvalbumin isoforms of the β-type were identified as the only allergens in barramundi and subsequently designated as Lat c 1.0101 and Lat c 1.0201 by the International Union of Immunological Societies. These two isoallergens do not differ in their ability to bind IgE antibodies, but are differentially expressed in barramundi tissue. This study characterized two novel heat stable parvalbumin allergens from barramundi, with differential IgE binding capacity between adults and pediatric patients.
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Affiliation(s)
- Michael F Sharp
- School of Pharmacy and Molecular Science, Centre for Biodiscovery and Molecular Development of Therapeutics, James Cook University, Townsville, Queensland, Australia
| | - Sandip D Kamath
- School of Pharmacy and Molecular Science, Centre for Biodiscovery and Molecular Development of Therapeutics, James Cook University, Townsville, Queensland, Australia
| | - Martina Koeberl
- School of Pharmacy and Molecular Science, Centre for Biodiscovery and Molecular Development of Therapeutics, James Cook University, Townsville, Queensland, Australia
| | - Dean R Jerry
- Aquaculture Genetics Research Program, School of Marine and Tropical Biology, James Cook University, Townsville, Queensland, Australia
| | - Robyn E O'Hehir
- Department of Allergy, Immunology and Respiratory Medicine, Alfred Hospital And Monash University, Melbourne, Victoria, Australia
| | - Dianne E Campbell
- Children's Hospital at Westmead, Allergy & Immunology, Westmead, NSW, Australia
| | - Andreas L Lopata
- School of Pharmacy and Molecular Science, Centre for Biodiscovery and Molecular Development of Therapeutics, James Cook University, Townsville, Queensland, Australia.
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17
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Winkelmann A, Maggio N, Eller J, Caliskan G, Semtner M, Häussler U, Jüttner R, Dugladze T, Smolinsky B, Kowalczyk S, Chronowska E, Schwarz G, Rathjen FG, Rechavi G, Haas CA, Kulik A, Gloveli T, Heinemann U, Meier JC. Changes in neural network homeostasis trigger neuropsychiatric symptoms. J Clin Invest 2014; 124:696-711. [PMID: 24430185 PMCID: PMC3904623 DOI: 10.1172/jci71472] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Accepted: 10/31/2013] [Indexed: 12/13/2022] Open
Abstract
The mechanisms that regulate the strength of synaptic transmission and intrinsic neuronal excitability are well characterized; however, the mechanisms that promote disease-causing neural network dysfunction are poorly defined. We generated mice with targeted neuron type-specific expression of a gain-of-function variant of the neurotransmitter receptor for glycine (GlyR) that is found in hippocampectomies from patients with temporal lobe epilepsy. In this mouse model, targeted expression of gain-of-function GlyR in terminals of glutamatergic cells or in parvalbumin-positive interneurons persistently altered neural network excitability. The increased network excitability associated with gain-of-function GlyR expression in glutamatergic neurons resulted in recurrent epileptiform discharge, which provoked cognitive dysfunction and memory deficits without affecting bidirectional synaptic plasticity. In contrast, decreased network excitability due to gain-of-function GlyR expression in parvalbumin-positive interneurons resulted in an anxiety phenotype, but did not affect cognitive performance or discriminative associative memory. Our animal model unveils neuron type-specific effects on cognition, formation of discriminative associative memory, and emotional behavior in vivo. Furthermore, our data identify a presynaptic disease-causing molecular mechanism that impairs homeostatic regulation of neural network excitability and triggers neuropsychiatric symptoms.
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Affiliation(s)
- Aline Winkelmann
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Nicola Maggio
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Joanna Eller
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Gürsel Caliskan
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Marcus Semtner
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Ute Häussler
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - René Jüttner
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Tamar Dugladze
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Birthe Smolinsky
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Sarah Kowalczyk
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Ewa Chronowska
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Günter Schwarz
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Fritz G. Rathjen
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Gideon Rechavi
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Carola A. Haas
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Akos Kulik
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Tengis Gloveli
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Uwe Heinemann
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
| | - Jochen C. Meier
- FU-Berlin, Fachbereich Biologie, Chemie, Pharmazie, Berlin, Germany.
RNA editing and Hyperexcitability Disorders Helmholtz Group, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Talpiot Medical Leadership Program, Department of Neurology and the J. Sagol Neuroscience Center, The Chaim Sheba Medical Center, Tel HaShomer, Israel.
Cellular and Network Physiology Group, Institute of Neurophysiology, Charité Universitätsmedizin Berlin, Berlin, Germany.
CC2 Zentrum für Physiologie, Freie Universität Berlin, Berlin, Germany.
Experimental Epilepsy Research, Department of Neurosurgery, Neurocenter, University of Freiburg, Freiburg, Germany.
Developmental Neurobiology, Max Delbrück Center for Molecular Medicine, Berlin, Germany.
Institute of Biochemistry, University of Cologne and Center for Molecular Medicine, Cologne, Germany.
Department of Physiology II, University of Freiburg, Freiburg, Germany.
Sheba Cancer Research Center, The Chaim Sheba Medical Center and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
BrainLinks-BrainTools, Cluster of Excellence and
BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany.
Bernstein Center for Computational Neuroscience Berlin, Berlin, Germany
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Moraes AH, Ackerbauer D, Kostadinova M, Bublin M, Ferreira F, Almeida FCL, Breiteneder H, Valente AP. ¹H, ¹³C and ¹⁵N resonance assignments and second structure information of Gad m 1: a β-parvalbumin allergen from Atlantic cod (Gadus morhua). Biomol NMR Assign 2013; 7:133-136. [PMID: 22585088 DOI: 10.1007/s12104-012-9393-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Accepted: 05/03/2012] [Indexed: 05/31/2023]
Abstract
Gad m 1 is the major allergen from Atlantic cod. It belongs to β-parvalbumin protein family and is characterized by the presence of two calcium-binding sites so called EF-hand motifs. β-Parvalbumins such as Gad m 1 are the most important fish allergens and their high cross-reactivity is the cause of the observed polysensitization to various fish species in allergic patients. Despite extensive efforts, the complete elucidation of β-parvalbumin-IgE complexes has not been achieved yet. Allergen structural studies are essential for the development of novel immunotherapy strategies, including vaccination with hypoallergenic derivatives and chimeric molecules. Here, we report for the first time the NMR study of a β-parvalbumin: Gad m 1. This report includes: (1)H, (13)C and (15)N resonance assignments of Gad m 1 as well as the second structure information based on the (13)C chemical shifts.
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Affiliation(s)
- A H Moraes
- Centro Nacional de Ressonância Magnética, Instituto de Bioquímica Médica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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19
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Permyakov SE, Knyazeva EL, Khasanova LM, Fadeev RS, Zhadan AP, Roche-Hakansson H, Håkansson AP, Akatov VS, Permyakov EA. Oleic acid is a key cytotoxic component of HAMLET-like complexes. Biol Chem 2013; 393:85-92. [PMID: 22628302 DOI: 10.1515/bc-2011-230] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2011] [Accepted: 11/24/2011] [Indexed: 11/15/2022]
Abstract
HAMLET is a complex of α-lactalbumin (α-LA) with oleic acid (OA) that selectively kills tumor cells and Streptococcus pneumoniae. To assess the contribution of the proteinaceous component to cytotoxicity of HAMLET, OA complexes with proteins structurally and functionally distinct from α-LA were prepared. Similar to HAMLET, the OA complexes with bovine β-lactoglobulin (bLG) and pike parvalbumin (pPA) (bLG-OA-45 and pPA-OA-45, respectively) induced S. pneumoniae D39 cell death. The activation mechanisms of S. pneumoniae death for these complexes were analogous to those for HAMLET, and the cytotoxicity of the complexes increased with OA content in the preparations. The half-maximal inhibitory concentration for HEp-2 cells linearly decreased with rise in OA content in the preparations, and OA concentration in the preparations causing HEp-2 cell death was close to the cytotoxicity of OA alone. Hence, the cytotoxic action of these complexes against HEp-2 cells is induced mostly by OA. Thermal stabilization of bLG upon association with OA implies that cytotoxicity of bLG-OA-45 complex cannot be ascribed to molten globule-like conformation of the protein component. Overall, the proteinaceous component of HAMLET-like complexes studied is not a prerequisite for their activity; the cytotoxicity of these complexes is mostly due to the action of OA.
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Affiliation(s)
- Sergei E Permyakov
- Institute for Biological Instrumentation, Russian Academy of Sciences, Pushchino, Moscow 142290, Russia.
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20
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Minkiewicz P, Bucholska J, Darewicz M, Borawska J. Epitopic hexapeptide sequences from Baltic cod parvalbumin beta (allergen Gad c 1) are common in the universal proteome. Peptides 2012; 38:105-9. [PMID: 22940202 DOI: 10.1016/j.peptides.2012.08.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 08/14/2012] [Accepted: 08/14/2012] [Indexed: 01/25/2023]
Abstract
The aim of this study was to analyze the distribution of hexapeptide fragments considered as epitopes of Baltic cod parvalbumin beta (allergen Gad c 1) in the universal proteome. Cod (Gadus morhua subsp. callarias) parvalbumin hexapeptides cataloged in the Immune Epitope Database were used as query sequences. The UniProt database was screened using the WU-BLAST 2 program. The distribution of hexapeptide fragments was investigated in various protein families, classified according to the presence of the appropriate domains, and in proteins of plant, animal and microbial species. Hexapeptides from cod parvalbumin were found in the proteins of plants and animals which are food sources, microorganisms with various applications in food technology and biotechnology, microorganisms which are human symbionts and commensals as well as human pathogens. In the last case possible coverage between epitopes from pathogens and allergens should be avoided during vaccine design.
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Affiliation(s)
- Piotr Minkiewicz
- University of Warmia and Mazury in Olsztyn, Chair of Food Biochemistry, Olsztyn-Kortowo, Poland.
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21
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Vekshin NL. [Photo-induced conformational motility of proteins]. Biofizika 2012; 57:741-745. [PMID: 23136764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The dynamics of proteins, detected by fluorescence, consists of three components: spontaneous dynamics, dipole-dipole photo-induced dynamics, thermal photo-induced dynamics. The photo-induced dynamics can lead to activation as well as inactivation of enzymes.
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22
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Tishchenko VM. [The internal cavities of pike alpha-parvalbumin probably contain water]. Biofizika 2012; 57:395-397. [PMID: 22873060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The kinetics of hydrogen exchange of pike a-parvalbumin was investigated using the method of infrared spectroscopy (sensitive to the amide hydrogen atoms in the peptide) and radioisotope method (sensitive to all labile hydrogen atoms). Ultraslow exchangeable hydrogen atoms were found to be substantially less in the first case than in the second one. Taking into account that the internal cavities in the parvalbumin are formed by hydrophobic amino acid residues, devoid of labile hydrogen atoms, it is possible to make the most appropriate assumption, namely, these cavities contain water molecules, hydrogen atoms of which are ultraslow exchangeable.
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23
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Cai QF, Liu GM, Li T, Hara K, Wang XC, Su WJ, Cao MJ. Purification and characterization of parvalbumins, the major allergens in red stingray (Dasyatis akajei). J Agric Food Chem 2010; 58:12964-12969. [PMID: 21121608 DOI: 10.1021/jf103316h] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Fish has received increasing attention because it induces IgE-mediated food allergy. Parvalbumin (PV) represents the major allergen of fish, and IgE cross-reactivity to PV in various teleost fish species has been shown, while little information is available about allergens in elasmobranch fish. In this study, two PV isoforms (named as PV-I and PV-II) from red stingray (Dasyatis akajei) were purified to homogeneity by a series of procedures including ammonium sulfate precipitation and column chromatographies of DEAE-Sepharose and Sephacryl S-200. Purified PVs revealed a single band on tricine-sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The molecular masses of PV-I and PV-II were 12.29 and 11.95 kDa, respectively, as determined by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Western blot using antifrog PV monoclonal antibody (PARV-19) showed positive reactions to the two proteins, confirming that they were PVs, although their immunological reactivities were weaker than those of PV from silver carp. The N-terminal amino acid sequence of PV-I was determined, and comparison with PVs from other fish species showed low homology between teleost and elasmobranch fish. The isoelectric points of PV-I and PV-II were 5.4 and 5.0, respectively, as determined by two-dimensional electrophoresis (2-DE), suggesting that both isoforms belong to the α-group. IgE immunoblotting analysis showed that sera from fish-allergic patients reacted to both PV-I and PV-II from red stingray. Thermal stability revealed that PV-I easily formed oligomers than PV-II, which might contribute to the maintenance of its allerginicity during heat processing.
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Affiliation(s)
- Qiu-Feng Cai
- College of Biological Engineering, Key Laboratory of Science and Technology for Aquaculture and Food Safety, Jimei University, Jimei, Xiamen, China, 361021
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Liu GM, Wang N, Cai QF, Li T, Sun LC, Su WJ, Cao MJ. Purification and characterization of parvalbumins from silver carp (Hypophthalmichthy molitrix). J Sci Food Agric 2010; 90:1034-1040. [PMID: 20355144 DOI: 10.1002/jsfa.3913] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
BACKGROUND As the largest producer and consumer of freshwater fish in the world, many people suffer from allergy for consuming freshwater fish in China. However, the allergen profiles of freshwater fish are rarely known. RESULTS Parvalbumins (PVs) from the white muscle of silver carp (Hypophthalmichthy molitrix) were purified by ammonium sulfate fractionation and column chromatography including DEAE-Sepharose and Superdex 75. Three PV isoforms-PV-I, PV-II, and PV-III-were obtained and their molecular masses as estimated by tricine-sodium dodecyl sulfate-polyacrylamide gel electrophoresis were 12, 11, and 14 kDa, respectively. All the PVs could be detected by anti-frog PV monoclonal antibody. PV-I and PV-II were quite possibly glycoproteins, while PV-III was not glycosylated, as analyzed by periodic acid-Schiff (PAS) staining. Thermal stability revealed that PV-I and PV-II easily formed polymers, while these proteins were stable in a pH range of 4.0-10.0. A PV gene encoding 110 amino acid residues was cloned and it revealed high identity with PVs from other species of fish. CONCLUSION Three isotypes of PV were purified to homogeneity and one distinct PV gene was cloned in silver carp white muscle.
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Affiliation(s)
- Guang-Ming Liu
- College of Biological Engineering, Key Laboratory of Science and Technology for Aquaculture and Food Safety, Jimei University, Xiamen 361021, China
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25
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Griesmeier U, Vázquez-Cortés S, Bublin M, Radauer C, Ma Y, Briza P, Fernández-Rivas M, Breiteneder H. Expression levels of parvalbumins determine allergenicity of fish species. Allergy 2010; 65:191-8. [PMID: 19796207 DOI: 10.1111/j.1398-9995.2009.02162.x] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
BACKGROUND Parvalbumins are the most important fish allergens. Polysensitization to various fish species is frequently reported and linked to the cross-reactivity of their parvalbumins. Studies on cross-reactivity and its association to the allergenicity of purified natural parvalbumins from different fish species are still lacking. In addition, some studies indicate that dark muscled fish such as tuna are less allergenic. METHODS Total protein extracts and purified parvalbumins from cod, whiff, and swordfish, all eaten frequently in Spain, were tested for their IgE-binding properties with 16 fish allergic patients' sera from Madrid. The extent of cross-reactivity of these parvalbumins was investigated by IgE ELISA inhibition assays. Additionally, the cDNA sequences of whiff and swordfish parvalbumins were determined. RESULTS Extractable amounts of parvalbumins from cod were 20 times and from whiff 30 times higher than from swordfish. Parvalbumins were recognized by 94% of the patients in extracts of cod and whiff, but only by 60% in swordfish extracts. Nevertheless, a high cross-reactivity was determined for all purified parvalbumins by IgE inhibition. The amino acid sequence identities of the three parvalbumins were in a range of 62-74%. CONCLUSIONS The parvalbumins of cod, whiff and swordfish are highly cross-reactive. The high amino acid sequence identity among cod, whiff and swordfish parvalbumins results in the observed IgE cross-reactivity. The low allergenicity of swordfish is due to the low expression levels of its parvalbumin.
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Affiliation(s)
- U Griesmeier
- Department of Pathophysiology, Center for Physiology, Pathophysiology and Immunology, Medical University of Vienna, Austria
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26
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Beale JE, Jeebhay MF, Lopata AL. Characterisation of purified parvalbumin from five fish species and nucleotide sequencing of this major allergen from Pacific pilchard, Sardinops sagax. Mol Immunol 2009; 46:2985-93. [PMID: 19616851 DOI: 10.1016/j.molimm.2009.06.018] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2009] [Accepted: 06/16/2009] [Indexed: 11/17/2022]
Abstract
IgE-mediated allergic reaction to seafood is a common cause of food allergy including anaphylactic reactions. Parvalbumin, the major fish allergen, has been shown to display IgE cross-reactivity among fish species consumed predominantly in Europe and the Far East. However, cross-reactivity studies of parvalbumin from fish species widely consumed in the Southern hemisphere are limited as is data relating to immunological and molecular characterisation. In this study, antigenic cross-reactivity and the presence of oligomers and isomers of parvalbumin from five highly consumed fish species in Southern Africa were assessed by immunoblotting using purified parvalbumin and crude fish extracts. Pilchard (Sardinops sagax) parvalbumin was found to display the strongest IgE reactivity among 10 fish-allergic consumers. The cDNA sequence of the beta-form of pilchard parvalbumin was determined and designated Sar sa 1.0101 (accession number FM177701 EMBL/GenBank/DDBJ databases). Oligomeric forms of parvalbumin were observed in all fish species using a monoclonal anti-parvalbumin antibody and subject's sera. Isoforms varied between approximately 10-13 kDa. A highly cross-reactive allergenic isoform of parvalbumin was identified and sequenced, providing a successful primary step towards the generation of a recombinant form that could be used for diagnostic and potential therapeutic use in allergic individuals.
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Affiliation(s)
- Janine E Beale
- Department of Immunology, Allergy and Asthma Research Group, Institute of Infectious Disease and Molecular Medicine (IIDMM), University of Cape Town, South Africa
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27
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Koppelman SJ, Luykx DMAM, de Jongh HHJ, Veldhuizen WJ. Physicochemical characterization of allergens: quantity, identity, purity, aggregation and conformation. Arb Paul Ehrlich Inst Bundesinstitut Impfstoffe Biomed Arzneim Langen Hess 2009; 96:39-54. [PMID: 20799444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Allergens and allergoids can be characterized by means of physicochemical methods, resulting in a description of the protein on different structural levels. Several techniques are available and their suitability depends on the composition of the particular sample. Current European legislation on allergen products demands characterization of final products in particular focusing on identity, degree of modification (for allergoids) and stability of the composition. Structural parameters of allergens may be used to investigate the stability of an allergen product. The challenge is to identify and optimize techniques that allow determination of protein structure in the context of a formulated pharmaceutical product. As the majority of the products currently marketed are formulated with aluminium hydroxide or aluminium phosphate as a depot, most of the methods and techniques used for protein characterization in solution are not applicable. An additional hurdle is that allergen products are based on natural extracts, comprising a mixture of proteins, both allergens and non-allergens, sometimes in the presence of other uncharacterized components from the raw material. This paper describes which methods are suitable for the different stages of allergen product manufacturing, and how these relate to the current regulatory requirements. Some of the techniques are demonstrated using a model allergen, cod parvalbumin, and a chemically modified form thereof. We conclude that a variety of methods is available for characterization of proteins in solution, and that a limited number of techniques appear to be suitable for modified allergens (allergoids). Adaptation of existing methods, e.g. mass spectroscopy and infrared spectroscopy may be helpful to obtain protein parameters of allergens in a formulated allergen product. By choosing a combination of techniques, including those additional to physicochemical approaches, relevant parameters of allergens in formulated allergen products can be assessed in order to achieve a well-characterized pharmaceutical product.
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Shiomi K. [Immunological properties and clinical relevance of seafood allergens]. Arerugi 2008; 57:1083-1093. [PMID: 19052502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Affiliation(s)
- Kazuo Shiomi
- Department of Food Science and Technology, Tokyo University of Marine Science and Technology.
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29
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Glazer DS, Radmer RJ, Altman RB. Combining molecular dynamics and machine learning to improve protein function recognition. Pac Symp Biocomput 2008:332-343. [PMID: 18229697 PMCID: PMC2459243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
As structural genomics efforts succeed in solving protein structures with novel folds, the number of proteins with known structures but unknown functions increases. Although experimental assays can determine the functions of some of these molecules, they can be expensive and time consuming. Computational approaches can assist in identifying potential functions of these molecules. Possible functions can be predicted based on sequence similarity, genomic context, expression patterns, structure similarity, and combinations of these. We investigated whether simulations of protein dynamics can expose functional sites that are not apparent to the structure-based function prediction methods in static crystal structures. Focusing on Ca2+ binding, we coupled a machine learning tool that recognizes functional sites, FEATURE, with Molecular Dynamics (MD) simulations. Treating molecules as dynamic entities can improve the ability of structure-based function prediction methods to annotate possible functional sites.
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Affiliation(s)
- Dariya S Glazer
- Department of Genetics, Stanford University, 318 Campus Drive Clark Center S240 Stanford, CA 94305, USA
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30
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Abstract
Relative to other parvalbumin isoforms, the mammalian beta-parvalbumin (oncomodulin) displays attenuated divalent ion affinity. High-resolution structural data for the Ca(2+)-bound protein have provided little insight into the physical basis for this behavior, prompting an examination of the unliganded state. This article describes the solution structure and peptide backbone dynamics of Ca(2+)-free rat beta-parvalbumin (beta-PV). Ca(2+) removal evidently provokes significant structural alterations. Interaction between the D helix and the AB domain in the Ca(2+)-bound protein is greatly diminished in the apo-form, permitting the D helix to straighten. There is also a significant reorganization of the hydrophobic core and a concomitant remodeling of the interface between the AB and CD-EF domains. These modifications perturb the orientation of the C and D helices, and the energetic penalty associated with their reversal could contribute to the low-affinity signature of the CD site. By contrast, Ca(2+) removal causes a comparatively minor perturbation of the E and F helices, consistent with the more typical divalent ion affinity observed for the EF site. Ca(2+)-free rat beta-PV retains structural rigidity on the picosecond-nanosecond timescale. At 20 degrees C, the majority of amide vectors show no evidence for motion on timescales above 20 ps, and the average order parameter for the entire molecule is 0.92.
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Affiliation(s)
- Michael T Henzl
- Department of Biochemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA.
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31
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Rodenbaugh DW, Wang W, Davis J, Edwards T, Potter JD, Metzger JM. Parvalbumin isoforms differentially accelerate cardiac myocyte relaxation kinetics in an animal model of diastolic dysfunction. Am J Physiol Heart Circ Physiol 2007; 293:H1705-13. [PMID: 17545482 DOI: 10.1152/ajpheart.00232.2007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The cytosolic Ca(2+)/Mg(2+)-binding protein alpha-parvalbumin (alpha-Parv) has been shown to accelerate cardiac relaxation; however, beyond an optimal concentration range, alpha-Parv can also diminish contractility. Mathematical modeling suggests that increasing Parv's Mg(2+) affinity may lower the effective concentration of Parv ([Parv]) to speed relaxation and, thus, limit Parv-mediated depressed contraction. Naturally occurring alpha/beta-Parv isoforms show divergence in amino acid primary structure (57% homology) and cation-binding affinities, with beta-Parv having an estimated 16% greater Mg(2+) affinity and approximately 200% greater Ca(2+) affinity than alpha-Parv. We tested the hypothesis that, at the same or lower estimated [Parv], mechanical relaxation rate would be more significantly accelerated by beta-Parv than by alpha-Parv. Dahl salt-sensitive (DS) rats were used as an experimental model of diastolic dysfunction. Relaxation properties were significantly slowed in adult cardiac myocytes isolated from DS rats compared with controls: time from peak contraction to 50% relaxation was 57 +/- 2 vs. 49 +/- 2 (SE) ms (P < 0.05), validating this model system. DS cardiac myocytes were subsequently transduced with alpha- or beta-Parv adenoviral vectors. Upon Parv gene transfer, beta-Parv caused significantly faster relaxation than alpha-Parv (P < 0.05), even though estimated [beta-Parv] was approximately 10% of [alpha-Parv]. This comparative analysis showing distinct functional outcomes raises the prospect of utilizing naturally occurring Parv variants to address disease-associated slowed cardiac relaxation.
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Affiliation(s)
- David W Rodenbaugh
- Department of Molecular and Integrative Physiology, University of Michigan, 1301 E. Catherine St., Ann Arbor, MI 48109-0622, USA
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Abstract
Although rat beta-parvalbumin and chicken parvalbumin 3 (CPV3) are identical at 74 of 108 residues, rat beta exhibits perceptibly lower Ca2+ and Mg2+ affinities. At 25 degrees C, in Hepes-buffered saline, at pH 7.4, the overall deltadeltaG degrees ' values are 2.0 and 3.9 kcal/mol, respectively. These differences primarily reflect the disparate behavior of the CD sites in the two proteins. Their respective binding constants for Ca2+, for example, are 1.5 x 10(6) and 2.4 x 10(7) M-1. The extent to which this differential behavior is dictated by local and remote sequence differences is unknown. To explore this question, we performed mutagenesis on rat beta, substituting the corresponding CPV3 codon for residues 49, 50, 57, 58, 59, and 60. The resulting CD site is identical to CPV3 at 27 of 30 positions. The mutations were introduced in four stages, replacing residues 49 and 50 (yielding beta 49/50), then 57 and 58 (beta 49/50/57/58), then 59 (beta 49/50/57/58/59), and finally 60 (beta 49/50/57/58/59/60). Apoprotein stability was examined by scanning calorimetry and chemical denaturation and divalent ion affinity by titration calorimetry. All four variants exhibit elevated Tm values and are between 0.13 and 0.39 kcal/mol more stable at 25 degrees C. Although all four proteins display heightened divalent ion affinity, the increases are small. The maximal deltadeltaG degrees ' values, observed for 49/50/57/58/59/60, are just -0.56 and -0.96 kcal/mol for Ca2+ and Mg2+, respectively. Evidently, structural features beyond the metal ion-binding motif contribute to the unusual divalent ion-binding behavior associated with the rat beta CD site.
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Affiliation(s)
- Michael T Henzl
- Department of Biochemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA.
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Touboul D, Brunelle A, Laprévote O. Characterization of alpha-parvalbumin on muscle tissue sections by in situ calcium attachment. Rapid Commun Mass Spectrom 2007; 21:3756-3758. [PMID: 17952892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
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Zhao J, Nelson DJ, Huo S. Potential influence of Asp in the Ca2+ coordination position 5 of parvalbumin on the calcium-binding affinity: A computational study. J Inorg Biochem 2006; 100:1879-87. [PMID: 16965819 DOI: 10.1016/j.jinorgbio.2006.07.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2006] [Revised: 07/17/2006] [Accepted: 07/20/2006] [Indexed: 10/24/2022]
Abstract
Parvalbumins (PV) are calcium-binding proteins, all sharing the common helix-loop-helix (EF-hand) motif. This motif contains a central twelve-residue Ca(2+)-binding loop with the flanking helices positioned roughly perpendicular to each other. The precise role of these coordination residues has been the subject of intense studies. In this work, we focus on the coordination position 5 in the CD Ca(2+)-binding site of silver hake parvalbumin isoform B (SHPV-B). The most common residue at site 5 of calcium-binding loop in canonical EF-hands is Asp [B.J. Marsden, G.S. Shaw, B.D. Sykes, Biochem. Cell Biol. 68 (1990) 587-601], but in the CD site of PV, this position is almost always serine (Ser). The substitution of Ser with Asp will add the 5th carboxylate residue in the CD coordination sphere. However, as predicted by the acid pair hypothesis, the Ca(2+)-binding affinity would be maximized in an EF-hand motif that has four carboxylate ligands paired along the +/-x, and +/-z-axes [R.E. Reid, R.S. Hodges, J. Theor. Biol. 84 (1980) 401-444]. Molecular dynamics simulations and free energy calculations were employed to investigate the influence of Ser to Asp mutation at position 5 on calcium-binding affinity. We found that the Asp variant exhibited remarkable stability during the entire molecular dynamics simulation, with not only the retention of the Ca(2+)-binding site, but also increased compactness in the coordination sphere. The S55D fragment also accommodated Ca(2+) well. We conclude that the reason why Asp which is the most common residue at site 5 of calcium-binding loop in canonical EF-hands has never been identified at this position experimentally for PVs might be related to its physiological functions.
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Affiliation(s)
- Jingyan Zhao
- Gustaf H. Carlson School of Chemistry and Biochemistry, Clark University, 950 Main Street, Worcester, MA 01610, United States
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Carrera M, Cañas B, Piñeiro C, Vázquez J, Gallardo JM. Identification of commercial hake and grenadier species by proteomic analysis of the parvalbumin fraction. Proteomics 2006; 6:5278-87. [PMID: 16927426 DOI: 10.1002/pmic.200500899] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Analysis of parvalbumin fractions through proteomic methodologies allowed the differential classification of ten commercial, closely related species of the family Merlucciidae. Muscle extracts from nine hake species of the genus Merluccius including two subspecies of Merluccius australis (australis and polylepsis) and one grenadier species Macruronus novaezelandiae with two populations (novaezelandiae and magellanicus) were evaluated by 2-DE and MALDI-TOF MS. 2-DE demonstrated that the species tested displayed a low intra-specific degree of polymorphism and the isoform patterns were noticeably species-specific. MALDI-TOF mass fingerprints showed clear differences in the pattern of peptides produced by tryptic digestion between the Merluccius and the Macruronus, making the genus differentiation possible. In addition, a selective peptide mass present in the spectra from certain hakes allowed its classification in two groups: Euro-African and American hakes. Besides, some specific masses allowed a clearly individual identification for M. bilinearis, M. australis polylepsis, M. australis australis, M. productus, M. paradoxus and M. polli, while the rest of the hake species can be grouped in two clusters, comprising M. hubbsi and M. gayi in one and M. merluccius and M. capensis in the other.
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Affiliation(s)
- Mónica Carrera
- Instituto de Investigaciones Marinas, Vigo, Pontevedra, Spain.
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Chen L, Hefle SL, Taylor SL, Swoboda I, Goodman RE. Detecting fish parvalbumin with commercial mouse monoclonal anti-frog parvalbumin IgG. J Agric Food Chem 2006; 54:5577-82. [PMID: 16848548 DOI: 10.1021/jf060291g] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Parvalbumin is a calcium-binding muscle protein that is highly conserved across fish species and amphibians. It is the major cross-reactive allergen associated with both fish and frog allergy. We used two-dimensional electrophoretic and immunoblotting techniques to investigate the utility of a commercial monoclonal anti-frog parvalbumin IgG for detecting parvalbumin present in some commonly consumed fish species. The 2D electrophoresis and immunoblots revealed species-specific differences in proteins that appear to represent various numbers of isoforms of parvalbumin in carp (5), catfish (3), cod (1) and tilapia (2). No parvalbumin was detected in yellowfin tuna. Based on minor differences in relative intensities of protein staining and immunodetection, parvalbumin isoforms may have slight differences in the epitope region recognized by the anti-frog parvalbumin antibody. These results suggest that the frog anti-parvalbumin antibody can be used as a valuable tool to detect parvalbumins from the fish tested in this study, except yellowfin tuna.
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Affiliation(s)
- Lingyun Chen
- Food Allergy Research and Resource Program, University of Nebraska, Lincoln, Nebraska 68583-0919, USA, and Department of Pathophysiology, General Hospital, Medical University of Vienna, Wahringer Gurtel 18-20, Vienna A-1090, Austria
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Erickson JR, Moerland TS. Functional characterization of parvalbumin from the Arctic cod (Boreogadus saida): similarity in calcium affinity among parvalbumins from polar teleosts. Comp Biochem Physiol A Mol Integr Physiol 2006; 143:228-33. [PMID: 16412673 DOI: 10.1016/j.cbpa.2005.11.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2005] [Revised: 11/22/2005] [Accepted: 11/23/2005] [Indexed: 10/25/2022]
Abstract
Calcium dissociation constants (KD) were measured as a function of temperature for parvalbumin, a small acidic protein expressed abundantly in fast-twitch muscle, from the Arctic cod (Boreogadus saida) and compared to values previously determined for Antarctic and temperate zone teleosts. Estimates of KD were derived independently from fluorometric titrations and calorimetry. In addition, the primary structure of B. saida parvalbumin was determined. Calcium KDs for parvalbumin from B. saida were fundamentally similar to those for parvalbumins from Antarctic species (6.68+/-0.59 nM and 7.77+/-0.72 nM at 5 degrees C, respectively), but significantly different from temperate zone species (1.35+/-0.28 nM at 5 degrees C). However, estimates of KD for B. saida parvalbumin at 5 degrees C closely matched values for temperate zone fish at 25 degrees C (6.54+/-0.56 nM), recapitulating the prior observation that calcium affinity of parvalbumin is conserved at the native temperature of teleost fish. Full sequence of B. saida parvalbumin was generated using reverse-phase HPLC and RACE-PCR. The Arctic parvalbumin showed 83% homology to a carp parvalbumin. None of the 16 total substitutions between the two parvalbumins resided in the cation binding sites of the protein, indicating that the structural locus of the thermal sensitivity of function lies outside the active regions.
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Affiliation(s)
- Jeffrey R Erickson
- Department of Biological Science, Florida State University, Tallahassee, FL 32306-4370, USA
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Abstract
By using an analysis of existing genomic information it is concluded that in zebrafish nine genes encode parvalbumin (PV). These genes possess introns that differ in size and show nucleotide variability but they contain the same number of exons, and for each corresponding exon, the number of nucleotides therein are identical in all the paralogs. This rule also applies to the multiple PV genes of other species e.g. mammals. Each of these genes displays, however, characteristic 5' and 3' UTRs which appear highly conserved between closely related species (so that orthologs among these species can be readily identified) but which show larger numbers of mutations between species that are more distant in evolution. A tree is presented which suggests that the traditional classification of PVs as alpha or beta (based mainly on charge of the protein molecule) is not sustainable. Numbers 1-9 are assigned to the various isoforms to facilitate their identification in future studies. A bifurcation of isoforms into 1 and 4; 2 and 3; 6 and 7; 8 and 9 appears to have occurred simultaneously in more recent time, i.e. perhaps approximately 60 mys ago when primates and rodents branched.
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Affiliation(s)
- Felix Friedberg
- Department of Biochemistry and Molecular Biology, Howard University, Washington, DC, NW, USA.
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Abstract
Voltage-gated Ca2+ channels undergo a negative feedback regulation by Ca2+ ions, Ca2+-dependent inactivation, which is important for restricting Ca2+ signals in nerve and muscle. Although the molecular details underlying Ca2+-dependent inactivation have been characterized, little is known about how this process might be modulated in excitable cells. Based on previous findings that Ca2+-dependent inactivation of Ca(v)2.1 (P/Q-type) Ca2+ channels is suppressed by strong cytoplasmic Ca2+ buffering, we investigated how factors that regulate cellular Ca2+ levels affect inactivation of Ca(v)2.1 Ca2+ currents in transfected 293T cells. We found that inactivation of Ca(v)2.1 Ca2+ currents increased exponentially with current amplitude with low intracellular concentrations of the slow buffer EGTA (0.5 mm), but not with high concentrations of the fast Ca2+ buffer BAPTA (10 mm). However, when the concentration of BAPTA was reduced to 0.5 mm, inactivation of Ca2+ currents was significantly greater than with an equivalent concentration of EGTA, indicating the importance of buffer kinetics in modulating Ca2+-dependent inactivation of Ca(v)2.1. Cotransfection of Ca(v)2.1 with the EF-hand Ca2+-binding proteins, parvalbumin and calbindin, significantly altered the relationship between Ca2+ current amplitude and inactivation in ways that were unexpected from behavior as passive Ca2+ buffers. We conclude that Ca2+-dependent inactivation of Ca(v)2.1 depends on a subplasmalemmal Ca2+ microdomain that is affected by the amplitude of the Ca2+ current and differentially modulated by distinct Ca2+ buffers.
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Affiliation(s)
- Lisa Kreiner
- Department of Pharmacology and Center for Neurodegenerative Disease, Emory University School of Medicine, Atlanta, Georgia 30322, USA
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40
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Abstract
Birds express three parvalbumins, one alpha isoform and two beta isoforms. The latter are known as avian thymic hormone (ATH) and avian parvalbumin 3. Although both were discovered in thymus tissue, and presumably function in T-cell maturation, they have been detected in other tissue settings. We have conducted detailed Ca2+- and Mg2+-binding studies on recombinant ATH and the C72S variant of CPV3, employing global analysis of isothermal titration calorimetry data. In Hepes-buffered saline, ATH binds Ca2+ with apparent microscopic binding constants of 2.4 +/- 0.2 x 10(8) and 1.0 +/- 0.1 x 10(8) M(-1). The corresponding values for CPV3-C72S are substantially lower, 4.5 +/- 0.5 x 10(7) and 2.4 +/- 0.2 x 10(7) M(-1), a 1.9-kcal/mol difference in binding free energy. Thus, the beta-parvalbumin lineage displays a spectrum of Ca2+-binding affinity, with ATH and the mammalian beta isoform at the high- and low-affinity extremes and CPV3 in the middle. Interestingly, despite its decreased Ca2+ affinity, CPV3-C72S exhibits increased affinity for Mg2+, relative to ATH. Whereas the latter displays Mg2+-binding constants of 2.2 +/- 0.2 x 10(4) and 1.2 +/- 0.1 x 10(4) M(-1), CPV3-C72S yields values of 5.0 +/- 0.8 x 10(4) and 2.1 +/- 0.3 x 10(4) M(-1).
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Affiliation(s)
- Michael T Henzl
- Department of Biochemistry, University of Missouri-Columbia, Columbia, Missouri, USA.
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41
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Babini E, Bertini I, Capozzi F, Luchinat C, Quattrone A, Turano M. Principal Component Analysis of the Conformational Freedom within the EF-Hand Superfamily. J Proteome Res 2005; 4:1961-71. [PMID: 16335940 DOI: 10.1021/pr050148n] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A database of nonredundant structures of EF-hand domains--i.e., pairs of helix-loop-helix motifs--has been assembled, and the six angles among the four helices re-determined. A principal component analysis of these angles allows us to use two such components (PC1 and PC2) to describe the system retaining 80% of the total variance. A PC2 against PC1 plot representation allows us to represent in a compact way the full range of structural diversity of EF-hand domains, their grouping into protein families, and the variation for each family upon calcium and peptide binding.
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Affiliation(s)
- Elena Babini
- Department of Food Science, University of Bologna, 47023 Cesena, Italy
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42
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Erickson JR, Moerland TS. A competition assay of magnesium affinity for EF-hand proteins based on the fluorescent indicator magnesium green. Anal Biochem 2005; 345:343-5. [PMID: 16083847 DOI: 10.1016/j.ab.2005.06.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2005] [Accepted: 06/23/2005] [Indexed: 11/28/2022]
Affiliation(s)
- Jeffrey R Erickson
- Department of Biological Science, Florida State University, Tallahassee, FL 32306, USA
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43
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Babini E, Felli IC, Lelli M, Luchinat C, Pierattelli R. Backbone and side-chains 1H, 13C and 15N NMR assignment of human beta-parvalbumin. J Biomol NMR 2005; 33:137. [PMID: 16258835 DOI: 10.1007/s10858-005-2986-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
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44
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Untersmayr E, Szalai K, Riemer AB, Hemmer W, Swoboda I, Hantusch B, Schöll I, Spitzauer S, Scheiner O, Jarisch R, Boltz-Nitulescu G, Jensen-Jarolim E. Mimotopes identify conformational epitopes on parvalbumin, the major fish allergen. Mol Immunol 2005; 43:1454-61. [PMID: 16150491 DOI: 10.1016/j.molimm.2005.07.038] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2005] [Indexed: 10/25/2022]
Abstract
Parvalbumin, the major fish allergen, is recognized by allergen-specific IgE of more than 90% of all fish-allergic patients. A detailed knowledge of allergenic structures is crucial for developing a vaccine inducing blocking antibodies specifically directed towards the IgE binding epitopes. In the present study we aimed to use the phage display technique to generate mimotopes, which mimic epitopes on parvalbumin. Parvalbumin-specific IgE was purified from sera of fish-allergic patients and used for screening of a constrained decamer phage library. After four rounds of biopanning using parvalbumin-specific IgE, five phage clones were selected which were specifically recognized by parvalbumin-specific IgE as well as IgG. DNA sequencing and peptide alignment revealed a high degree of sequence similarities between the mimotopes. Interestingly, on the surface of natural parvalbumin three regions could be defined by computational mimotope matching. In accordance, previously defined allergenic peptides of cod parvalbumin highlighted areas in close proximity or overlapping with the mimotope matching sites. From the presented data we conclude that our approach identified conformational epitopes of parvalbumin relevant for IgE and IgG binding. We suggest that these mimotopes are suitable candidates for an epitope-specific immunotherapy of fish-allergic patients.
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Affiliation(s)
- Eva Untersmayr
- Center of Physiology and Pathophysiology, Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria
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45
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Tanner JJ, Agah S, Lee YH, Henzl MT. Crystal Structure of the D94S/G98E Variant of Rat α-Parvalbumin. An Explanation for the Reduced Divalent Ion Affinity. Biochemistry 2005; 44:10966-76. [PMID: 16101280 DOI: 10.1021/bi050770t] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Simultaneous replacement of Asp-94 with serine and Gly-98 with glutamate in rat alpha-parvalbumin creates a CD-site ligand array in the context of the EF-site binding loop. Previous work has shown that, relative to the wild-type CD site, this engineered site has markedly reduced Ca(2+) affinity. Seeking an explanation for this phenomenon, we have obtained the crystal structure of the alpha D94S/G98E variant. The Ca(2+) coordination within the engineered EF site of the 94/98E variant is nearly identical to that within the CD site, suggesting that the attenuated affinity of the EF site in 94/98E is not a consequence of suboptimal coordination geometry. We have also examined the divalent ion binding properties of the alpha 94/98E variant in both Na(+)- and K(+)-containing buffers. Although the Ca(2+) and Mg(2+) affinities are higher in K(+) solution, the increases are comparable to those observed for wild-type alpha. Consistent with that finding, the apparent Na(+) stoichiometry, estimated from stability studies conducted as a function of Na(+) concentration, is 1.0 +/- 0.1, identical to that of wild-type alpha. Thus, the reduced affinity for divalent ions is evidently not the result of heightened monovalent ion competition. The thermodynamic analysis indicates that the less favorable Gibbs free energy of binding reflects a substantial enthalpic penalty. Significantly, the crystal structure reveals a steric clash between Phe-57 and the C(gamma) atom of Glu-98. The consequent displacement of Phe-57 also produces a close contact with Ser-55. Thus, steric interference may be the source of the enthalpic penalty.
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Affiliation(s)
- John J Tanner
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
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46
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Abstract
United-residue potentials are derived for interactions of the calcium cation with polypeptide chains in energy-based prediction of protein structure with a united-residue (UNRES) force-field. Specific potentials were derived for the interaction of the calcium cation with the Asp, Glu, Asn, and Gln side chains and the peptide group. The analytical expressions for the interaction energies for each of these amino acids were obtained by averaging the electrostatic interaction energy, expressed by a multipole series over the dihedral angles not considered in the united-residue model, that is, the side-chain dihedral angles chi and the dihedral angles lambda for the rotation of peptide groups about the C(alpha)...C(alpha) virtual-bond axes. For the side-chains that do not interact favorably with calcium, simple excluded-volume potentials were introduced. The parameters of the potentials were obtained from ab initio quantum mechanical calculations of model systems at the Restricted Hartree-Fock (RHF) level with the 6-31G(d,p) basis set. The energy surfaces of pairs consisting of Ca(2+)-acetate, Ca(2+)-propionate, Ca(2+)-acetamide, Ca(2+)-propionamide, and Ca(2+)-N-methylacetamide systems (modeling the Ca(2+)-Asp(-), Ca(2+)-Glu(-), Ca(2+)-Asn, Ca(2+)-Gln, and Ca(2+)-peptide group interactions) at different distances and orientations were calculated. For each pair, the restricted free energy (RFE) surfaces were calculated by numerical integration over the degrees of freedom lost when switching from the all-atom model to the united-residue model. Finally, the analytical expressions for each pair were fitted to the RFE surfaces. This force-field was able to distinguish the EF-hand motif from all potential binding sites in the crystal structures of bovine alpha-lactalbumin, whiting parvalbumin, calbindin D9K, and apo-calbindin D9K.
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Affiliation(s)
- Mey Khalili
- Baker Laboratory of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853-1301, USA
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Babini E, Bertini I, Capozzi F, Del Bianco C, Hollender D, Kiss T, Luchinat C, Quattrone A. Solution structure of human beta-parvalbumin and structural comparison with its paralog alpha-parvalbumin and with their rat orthologs. Biochemistry 2005; 43:16076-85. [PMID: 15610002 DOI: 10.1021/bi048388o] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aim of this research was to determine the structure of human beta-parvalbumin (109 amino acids) and to compare it with its paralog and ortholog proteins. The structure was determined in solution using multinuclear and multidimensional NMR methods and refined using substitution of the EF-hand Ca(2+) ion with a paramagnetic lanthanide. The resulting family of structures had a backbone rmsd of 0.50 A. Comparison with rat oncomodulin (X-ray, 1.3 A resolution) as well as with human (NMR, backbone rmsd of 0.49 A) and rat (X-ray, 2.0 A resolution) parvalbumins reveals small but reliable local differences, often but not always related to amino acid variability. The analysis of these structures has led us to propose an explanation for the different affinity for Ca(2+) between alpha- and beta-parvalbumins and between parvalbumins and calmodulins.
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Affiliation(s)
- Elena Babini
- CERM, Via Luigi Sacconi 6, 50019 Sesto Fiorentino, Italy
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48
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Abstract
Association of the parvalbumin AB and CD-EF domains was examined in Hepes-buffered saline, pH 7.4, employing fragments from rat alpha and beta. All of the interactions require Ca(2+). In saturating Ca(2+), the alpha AB/alpha CD-EF (alpha/alpha) complex displays an association constant of (7.6 +/- 0.4) x 10(7) M(-1). Ca(2+)-binding data for a mixture of the alpha fragments are compatible with an identical two-site model, yielding an average binding constant of (8.5 +/- 0.2) x 10(5) M(-1). The beta/beta interaction is significantly weaker, exhibiting an association constant of (3.0 +/- 0.6) x 10(6) M(-1). The Ca(2+)-binding constants for beta/beta are likewise diminished, at (1.0 +/- 0.1) x 10(5) and (2.3 +/- 0.2) x 10(4) M(-1). The magnitude of the apparent DeltaDeltaG(degree)' for Ca(2+) binding by alpha/alpha and beta/beta, at 3.4 kcal/mol, approaches that measured for the intact proteins (3.6 kcal/mol) and is substantially larger than the 1.5 kcal/mol value previously measured for the isolated CD-EF domains. This result suggests that the AB domain can modulate the Ca(2+) affinities of the CD and EF sites. Interestingly, the heterologous alpha/beta complex displays a larger association constant [(6.6 +/- 0.4) x 10(6) M(-1)] than the homologous beta/beta complex and heightened Ca(2+) affinity [binding constants of (1.3 +/- 0.1) x 10(6) and (8.8 +/- 0.2) x 10(4) M(-1)]. By contrast, beta/alpha associates more weakly than alpha/alpha and exhibits sharply reduced affinity for Ca(2+). Thus, the interaction between the beta AB domain and beta CD-EF domain may act to attenuate Ca(2+) affinity in the intact protein.
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Affiliation(s)
- Michael T Henzl
- Department of Biochemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA.
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49
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Abstract
In model peptide systems, Ca2+ affinity is maximized in EF-hand motifs containing four carboxylates positioned on the +x and -x and +z and -z axes; introduction of a fifth carboxylate ligand reduces the affinity. However, in rat beta-parvalbumin, replacement of Ser-55 with aspartate heightens divalent ion affinity [Henzl, M. T., et al. (1996) Biochemistry 35, 5856-5869]. The corresponding alpha-parvalbumin variant (S55D/E59D) likewise exhibits elevated affinity [Henzl, M. T., et al. (2003) Anal. Biochem. 319, 216-233]. To determine whether these mutations produce a variation on the archetypal EF-hand coordination scheme, we have obtained high-resolution X-ray crystallographic data for alpha S55D/E59D. As anticipated, the aspartyl carboxylate replaces the serine hydroxyl at the +z coordination position. Interestingly, the Asp-59 carboxylate abandons the role it plays as an outer sphere ligand in wild-type rat beta, rotating away from the Ca2+ and, instead, forming a hydrogen bond with the amide of Glu-62. Superficially, the coordination sphere in the CD site of alpha S55D/E59D resembles that in the EF site. However, the orientation of the Asp-59 side chain is predicted to stabilize the D-helix, which may contribute to the heightened divalent ion affinity. DSC data indicate that the alpha S55D/E59D variant retains the capacity to bind 1 equiv of Na+. Consistent with this finding, when binding measurements are conducted in K(+)-containing buffer, divalent ion affinity is markedly higher. In 0.15 M KCl and 0.025 M Hepes-KOH (pH 7.4) at 5 degrees C, the macroscopic Ca2+ binding constants are 1.8 x 10(10) and 2.0 x 10(9) M(-1). The corresponding Mg2+ binding constants are 2.7 x 10(6) and 1.2 x 10(5) M(-1).
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Affiliation(s)
- Yong-Hwan Lee
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
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50
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Abstract
Introduction of a fifth carboxylate into the ligand array of the CD site (via the combined S55D and E59D mutations) or the EF site (G98D) of rat alpha-parvalbumin substantially increases divalent ion affinity. This behavior, in conflict with that seen in model peptide systems, agrees with existing data for rat beta-parvalbumin [Henzl et al. (1996) Biochemistry 35, 5856-5869]. The complete analysis of the S55D/E59D double variant necessitated characterization of alpha E59D. Whereas the D59E mutation has minimal influence on beta CD site affinity, E59D has a major impact on the alpha CD site, lowering the apparent association constant by a factor of 14. The thermodynamic consequences of exchanging the rat alpha CD and EF site ligand arrays, which differ at the +z and -x coordination positions, were also examined. When the alpha CD array is imported into the EF site, it acquires a low-affinity phenotype, in agreement with previous findings for beta [Henzl et al. (1998) Biochemistry 37, 9101-9111]. However, when the EF ligand array is introduced into the alpha CD binding loop, it retains a high-affinity signature. This result, contrary to that observed in beta, suggests that the influence of the parvalbumin CD site environment supersedes the intrinsic behavior of the ligand array, a conclusion further supported by the disparate impact of the beta D59E and alpha E59D mutations.
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Affiliation(s)
- Michael T Henzl
- Department of Biochemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA.
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