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Cheng W, Wang M, Li C, Xiao F, He J, Liu L, Niu H, Ma J. Study of the weak interaction mechanism of ovalbumin and caffeic acid using fluorescence spectroscopy and molecular dynamics simulation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 301:122966. [PMID: 37327498 DOI: 10.1016/j.saa.2023.122966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 05/29/2023] [Accepted: 05/30/2023] [Indexed: 06/18/2023]
Abstract
With the increasing demand for functional foods, the study on binding of active molecules and ovalbumin (OVA) via weak interaction has attracted widespread attention. In this work, the interaction mechanism of OVA and caffeic acid (CA) was revealed using fluorescence spectroscopy and dynamics simulation. The CA-induced fluorescence decrease of OVA was static quenching. Their binding complex had about 1 binding site and a 3.39 × 105 L·mol-1 affinity ability. Based on thermodynamic calculations and molecular dynamics simulation, the complex structure of OVA and CA were stable using hydrophobic interactions as the main force, where CA preferred to interact with a stable binding pocket consisting of E256, E25, and V200 with N24 amino acid residues. In the binding process of CA and OVA, the conformation of OVA was altered with a slight reduction of α-helix and β-sheet. The reduced molecular volume and more compact structure of the protein indicated that CA is beneficial to the structural stability of OVA. The research provides some new insights into the interaction between dietary proteins and polyphenols, expanding the application prospects of OVA as a carrier.
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Affiliation(s)
- Weiwei Cheng
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471000, China.
| | - Miaomiao Wang
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471000, China
| | - Can Li
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471000, China
| | - Feng Xiao
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471000, China
| | - Jialiang He
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471000, China
| | - Lili Liu
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471000, China
| | - Huawei Niu
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471000, China
| | - Jinliang Ma
- College of Food and Bioengineering, Henan University of Science and Technology, Luoyang 471000, China.
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2
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Zhang H, Zhao X, Chen X, Xu X. Thoroughly review the recent progresses in improving O/W interfacial properties of proteins through various strategies. Front Nutr 2022; 9:1043809. [DOI: 10.3389/fnut.2022.1043809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 10/10/2022] [Indexed: 11/13/2022] Open
Abstract
Along with the future food market developing world widely, the personalized nutrition and rational function food design are found to be urgently attracted. Oil in a water (O/W) emulsion system has an excellent ability to maintain nutraceuticals and thus plays a promising role in producing future functional foods. Understanding the interfacial related mechanisms involved are essential for improving the quality of food products. Protein can effectively reduce interfacial tension and stable immiscible phases. The interfacial properties of proteins directly affect the emulsion qualities, which have gradually become a prospective topic. This review will first briefly discuss the interfacial-related fundamental factors of proteins. Next, the paper thoroughly overviewed current physical and chemical strategies tailored to improving the interfacial and emulsion properties of proteins. To be summarized, a higher flexibility could allow protein to be more easily unfolded and adsorbed onto the interface but could also possibly form a softer interfacial film. Several physical strategies, such as thermal, ultrasound and especially high-pressure homogenization are well applied to improve the interfacial properties. The interfacial behavior is also altered by various green chemical strategies, such as pH adjustment, covalent modification, and low molecular weight (LMW) surfactant addition. These strategies upgraded emulsion properties by increasing adsorption load, accelerating diffusion and adsorption rate, associated with lowering interfacial tension, and promoting interfacial protein interactions. Future researches targeted at elucidating interfacial-bulk protein interactions, unraveling interfacial behavior through in silico tools, exploring connection between interfacial-industrial processing properties, and clarifying the interfacial-sensory-digestive relationships of O/W emulsions is needed to develop emulsion applications.
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3
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Razzak MA, Li J, Choi SS. Egg-Curry: Insights into the Interaction Between Curcumin and Ovalbumin Using Spectroscopic Analyses and Protein-Ligand Docking Simulations. FOOD BIOPHYS 2021. [DOI: 10.1007/s11483-021-09704-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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4
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Perumal M, Marimuthu P, Chen X. Investigation into the site-specific binding interactions between chlorogenic acid and ovalbumin using multi-spectroscopic and in silico simulation studies. J Biomol Struct Dyn 2021; 40:6619-6633. [PMID: 33627053 DOI: 10.1080/07391102.2021.1886992] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The binding interactions of bioactive compounds with proteins are of great importance in the food, biochemistry and pharmaceutical fields. Herein, the binding mechanisms between 5-O-caffeoylquinic acid (5-CQA) and ovalbumin (OVA) were investigated by multi-spectroscopic studies combined with docking and molecular dynamics (MD) simulations. The emission intensity of OVA was quenched by 5-CQA and Stern-Volmer analysis indicated the existence of a static suppression by OVA-5-CQA complex formation. Thermodynamic parameters revealed that the formation of complex was spontaneously driven by electrostatic and hydrogen-bonding interactions. Circle dichroism analyses showed that 5-CQA decreased the α-helix content of OVA structure from 58.05% to 54.32% upon increased OVA:5-CQA ratio to 1:3. Molecular docking results suggested 5-CQA forms hydrogen bond interactions with N88, T91, K92, N94, S98, F99, S100 and L101 residues of OVA. The experimental values were in good agreement with the calculated binding free energy values obtained by MD simulation (R2 = 0.89).Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Manivel Perumal
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Parthiban Marimuthu
- Structural Bioinformatics Laboratory (SBL - Biochemistry) and Pharmaceutical Science Laboratory (PSL - Pharmacy), Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland
| | - Xiumin Chen
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, P.R. China.,Institute of Food Physical Processing, Jiangsu University, Zhenjiang, Jiangsu, P.R. China.,International Research Center for Food Nutrition and Safety, Jiangsu University, Zhenjiang, Jiangsu, China
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Wang Y, Li H, Cheng L, Zhou J, Fu L. Unveiling specific nanoparticle-protein interactions via evaporated drops: From molecular recognition to allergen identification. Colloids Surf B Biointerfaces 2021; 201:111634. [PMID: 33657516 DOI: 10.1016/j.colsurfb.2021.111634] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 02/01/2021] [Accepted: 02/15/2021] [Indexed: 01/12/2023]
Abstract
Unveiling specific interactions between nanoparticles (NPs) and proteins could benefit a better control of NPs' performance in recognition-based detection, imaging and drug delivery. Herein, we investigated the specific recognition between an aptamer modified gold nanoparticle (Apt-AuNP) and its target protein arginine kinase (AK) through a coffee-ring effect (CRE)-based approach. The evaporated droplets of the Apt-AuNP with AK featured a ring-disk-ring transition with elevated AK concentration and a disk pattern was found when the Apt was saturated by AK. Moreover, the AK concentration versus ring thickness curve below the saturation point was proved to fit in an exponential function, indicating the strong association between the Apt-AuNP and AK. In contrast, the ring thickness above the saturation point fitted in a Gompertz growth model that was similar with the Apt-AuNPs incubated with the nonspecific protein (bovine serum albumin, BSA), suggesting that AK was nonspecifically adsorbed onto the AuNPs. The impact of the specific NP-protein interaction on the translation of CRE into macroscopic patterns was further utilized to identify target food allergen AK by the Apt-AuNPs over nontarget allergens (tropomyosin, ovalbumin and β-lactoglobulin). This work provided new insight into the general NP-protein association process and demonstrated the feasibility of employing CRE as an effective tool to profile the specific interactions between NPs and proteins.
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Affiliation(s)
- Yanbo Wang
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, 18 Xue Zheng Street, Hangzhou, 310018, PR China
| | - Huan Li
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, 18 Xue Zheng Street, Hangzhou, 310018, PR China
| | - Linlin Cheng
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, 18 Xue Zheng Street, Hangzhou, 310018, PR China
| | - Jinru Zhou
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, 18 Xue Zheng Street, Hangzhou, 310018, PR China
| | - Linglin Fu
- Food Safety Key Laboratory of Zhejiang Province, School of Food Science and Biotechnology, Zhejiang Gongshang University, 18 Xue Zheng Street, Hangzhou, 310018, PR China.
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Furkan M, Khan RH. Process, Outcomes and Possible Elimination of Aggregation with Special Reference to Heme Proteins; Likely Remediations of Proteinopathies. Curr Protein Pept Sci 2021; 21:573-583. [PMID: 32013844 DOI: 10.2174/1389203721666200204122732] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 01/08/2020] [Accepted: 01/10/2020] [Indexed: 01/13/2023]
Abstract
Protein folding is a natural phenomenon through which a linear polypeptide possessing necessary information attains three-dimension functionally active conformation. This is a complex and multistep process and therefore, the presence of several intermediary structures could be speculated as a result of protein folding. In in vivo, this folding process is governed by the assistance of other proteins called molecular chaperones and heat shock proteins. Due to the mechanism of protein folding, these intermediary structures remain major challenge for modern biology. Mutation in gene encoding amino acid can cause adverse environmental conditions which may result in misfolding of the linear polypeptide followed by the formation of aggregates and amyloidosis. Aggregation contributes to the pathophysiology of several maladies including diabetes mellitus, Huntington's and Alzheimer's disease. The propensity of native structure to form aggregated and fibrillar assemblies is a hallmark of amyloidosis. During aggregation of a protein, transition from α helix to β sheet is observed, and mainly β sheeted structure is visualised in a mature fibril. Heme proteins are very crucial for major life activities like transport of oxygen and carbon dioxide, synthesis of ATP, role in electron transport chain, and detoxification of free radicals formed during biochemical reactions. Any structural variation in the heme proteins may lead to a fatal response. Hence characterization of the folding intermediates becomes crucial. The characterization has been deciphered with the help of strong denaturants like acetonitrile and TFE. Moreover, possible role of elimination of these aggregates and prevention of protein denaturation is also discussed. Current review deals with the basic process and mechanism of the protein folding in general and the ultimate outcomes of the protein misfolding. Since Native conformation of heme proteins is essential for some vital activities as listed above, we have discussed possible prevention of denaturation and aggregation of heme proteins such as Hb, cyt c, catalase & peroxidase.
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Affiliation(s)
- Mohammad Furkan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University Aligarh, UP, 202002, India
| | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University Aligarh, UP, 202002, India
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7
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Mathew M, T V D, Aravindakumar CT, Aravind UK. Potential involvement of environmental triggers in protein aggregation with mercuric chloride as a model. Int J Biol Macromol 2021; 174:153-161. [PMID: 33484803 DOI: 10.1016/j.ijbiomac.2021.01.134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 01/14/2021] [Accepted: 01/19/2021] [Indexed: 10/22/2022]
Abstract
Heavy metal based toxicity has a direct relation with the perturbation of protein structure. We have investigated the progressive unfolding of ovalbumin, in the presence of increasing concentration mercury (0-6.25 μM) using different spectroscopic techniques. Formation of amorphous aggregate has been observed at the physiological pH. Initial addition of HgCl2 resulted in the association of monomers to oligomers that proceeded to non-fibrillar aggregates on further addition. The sigmoidal curve obtained from the Stern-Volmer plot clearly divided into three stage transition. A strong lag phase is observed indicating the time dependence for the association of competent monomers. The second stage was resolved into non-cooperative binding. These results match very well with the data from atomic force microscopy and the free energy change observed in the regions. Raman spectroscopic studies indicated toxic antiparallel β-sheets structure. Time dependent atomic force microscopy study revealed the off-pathway nature of amorphous aggregates. At molten globular state, similar quenching behaviour is observed. The atomic force microscopy images clearly indicate at pH 2.2 the initiation of fibril formation occurs at lower concentration of HgCl2 itself. Our results revealed the conformation switch of ovalbumin upon the contact of an environmental toxin and its possible way of toxicity.
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Affiliation(s)
- Manjumol Mathew
- Advanced Centre of Environmental Studies and Sustainable Development, Mahatma Gandhi University, Kottayam 686 560, India
| | - Divyalakshmi T V
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam 686 560, India
| | | | - Usha K Aravind
- School of Environmental Studies, Cochin University of Science and Technology, Kochi 682022, India.
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8
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Novel insights in linking solvent relaxation dynamics and protein conformations utilizing red edge excitation shift approach. Emerg Top Life Sci 2021; 5:89-101. [PMID: 33416893 DOI: 10.1042/etls20200256] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 12/14/2020] [Accepted: 12/18/2020] [Indexed: 01/01/2023]
Abstract
Protein hydration dynamics plays an important role in many physiological processes since protein fluctuations, slow solvation, and the dynamics of hydrating water are all intrinsically related. Red edge excitation shift (REES) is a unique and powerful wavelength-selective (i.e. excitation-energy dependent) fluorescence approach that can be used to directly monitor the environment-induced restriction and dynamics around a polar fluorophore in a complex biological system. This review is mainly focused on recent applications of REES and a novel analysis of REES data to monitor the structural dynamics, functionally relevant conformational transitions and to unmask the structural ensembles in proteins. In addition, the novel utility of REES in imaging protein aggregates in a cellular context is discussed. We believe that the enormous potential of REES approach showcased in this review will engage more researchers, particularly from life sciences.
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9
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Razzak MA, Choi SS. Delineating the interaction mechanism of glabridin and ovalbumin by spectroscopic and molecular docking techniques. Food Chem 2021; 347:128981. [PMID: 33444886 DOI: 10.1016/j.foodchem.2020.128981] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 12/10/2020] [Accepted: 12/28/2020] [Indexed: 11/16/2022]
Abstract
The interaction between ovalbumin (OVA) and isoflavonoid glabridin (GB) was investigated using spectroscopic and molecular docking techniques. Fluorescence spectroscopy revealed that GB was bound to OVA mainly due to hydrogen bonding and hydrophobic forces. FT-IR spectroscopy showed that the combination of GB and OVA resulted in a decrease in the β-sheet content of OVA and an increase in the α-helix and extended-chain content. All these experimental results were supported and clarified by molecular docking simulations. GB binding was able to inhibit chemical denaturant-induced structural changes in OVA as observed by intrinsic tryptophan and ANS fluorescence. Moreover, GB-OVA complex increased the aqueous solubility of GB by about 4.45 times at pH 7.0. These results provided insights into the interaction between GB and OVA that contributes to the utilization of GB in the food and pharmaceutical industries.
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Affiliation(s)
- Md Abdur Razzak
- Department of Energy Science and Technology, Myongji University, Yongin 17058, Republic of Korea
| | - Shin Sik Choi
- Department of Energy Science and Technology, Myongji University, Yongin 17058, Republic of Korea; Department of Food and Nutrition, Myongji University, Yongin 17058, Republic of Korea.
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10
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Lo SY, Goulet DL, Fraaz U, Siemann S. Effect of pH and denaturants on the fold and metal status of anthrax lethal factor. Arch Biochem Biophys 2020; 692:108547. [PMID: 32828796 DOI: 10.1016/j.abb.2020.108547] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 08/02/2020] [Accepted: 08/17/2020] [Indexed: 01/26/2023]
Abstract
Anthrax lethal factor (LF) is a critical component of the anthrax toxin, and functions intracellularly as a zinc-dependent endopeptidase targeting proteins involved in maintaining critical host signaling pathways. To reach the cytoplasm, LF requires to be unfolded and guided through the narrow protective antigen pore in a pH-dependent process. The current study sought to address the question as to whether LF is capable of retaining its metal ion when exposed to a low-pH environment (similar to that found in late endosomes) and an unfolding stress (induced by urea). Using a combination of tryptophan fluorescence spectroscopy and chelation studies, we show that a decrease in the pH value (from 7.0 to 5.0) leads to a pronounced shift in the onset of structural alterations in LF to lower urea concentrations. More importantly, the enzyme was found to retain its Zn2+ ion beyond the unfolding transitions monitored by Trp fluorescence, a finding indicative of tight metal binding to LF in a non-native state. In addition, an analysis of red-edge excitation shift (REES) spectra suggests the protein to maintain residual structure (a feature necessary for metal binding) even at very high denaturant concentrations. Furthermore, studies using the chromophoric chelator 4-(2-pyridylazo)resorcinol (PAR) revealed LF's Zn2+ ion to become accessible to complexation at urea concentrations in between those required to cause structural changes and metal dissociation. This phenomenon likely originates from the conversion of a PAR-inaccessible (closed) to a PAR-accessible (open) state of LF at intermediate denaturant concentrations.
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Affiliation(s)
- Suet Y Lo
- Department of Chemistry and Biochemistry, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada
| | - Danica L Goulet
- Department of Chemistry and Biochemistry, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada
| | - Usama Fraaz
- Department of Chemistry and Biochemistry, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada
| | - Stefan Siemann
- Department of Chemistry and Biochemistry, Laurentian University, Sudbury, Ontario, P3E 2C6, Canada.
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11
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Milošević J, Petrić J, Jovčić B, Janković B, Polović N. Exploring the potential of infrared spectroscopy in qualitative and quantitative monitoring of ovalbumin amyloid fibrillation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 229:117882. [PMID: 31818644 DOI: 10.1016/j.saa.2019.117882] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 11/29/2019] [Accepted: 11/30/2019] [Indexed: 06/10/2023]
Abstract
Amyloid fibrils are highly ordered self-assembled (poly)peptide aggregates with cross-β structural pattern. Ovalbumin was used as a model for exploring the potential of infrared spectroscopy in detecting structural transitions and quantitative monitoring of amyloid fibrillation. Low pH (pH 2) and high temperature (90 °C) over the course of 24 h were conditions applied for amyloid formation. Fibrillation of ovalbumin was monitored by ThT and ANS fluorescence, and SDS PAGE. A significant increase in ThT fluorescence with a plateau reached after 4 h of incubation, without the lag phase, was detected. Structural transitions leading to amyloid fibrillation were analysed using all three Amide regions in ATR-FTIR spectra. Significant changes were detected in Amide I and Amide III region (decrease of α-helix and increase of β-sheet peaks). To establish a fast, precise and simple method for quantitative monitoring of amyloid fibrillation, the Amide I/Amide II ratios of aggregation specific β-sheets (1625 and 1695 cm-1, respectively) with 1540 cm-1 as internal standard were used, resulting in good correlation (R2 = 0.93 and 0.95) with the data observed by monitoring ThT fluorescence. On the other hand, assessing aggregation specific β-sheet contents by self-deconvolution showed lower correlation with ThT fluorescence (R2 = 0.75 and 0.64). Here we examined structural transitions during ovalbumin fibrillation in a qualitative and quantitative manner by exploiting the full potential of Amide regions simultaneously. Secondary structure distribution was monitored using second derivative spectra in Amide I region. A novel, simple mathematical calculation for quantitative monitoring of fibrils formation was presented employing that the increase in low and high frequency aggregation specific β-sheet in Amide I region compared to the internal standard in Amide II region is suitable for fibril formation monitoring.
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Affiliation(s)
- Jelica Milošević
- University of Belgrade - Faculty of Chemistry, Department of Biochemistry, Belgrade, Serbia
| | - Jovan Petrić
- University of Belgrade - Faculty of Chemistry, Department of Biochemistry, Belgrade, Serbia
| | - Branko Jovčić
- University of Belgrade - Faculty of Biology, Belgrade, Serbia; Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | - Brankica Janković
- University of Belgrade - Faculty of Chemistry, Department of Biochemistry, Belgrade, Serbia
| | - Natalija Polović
- University of Belgrade - Faculty of Chemistry, Department of Biochemistry, Belgrade, Serbia.
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12
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de Lyra ACF, Dos Santos Silva AL, Dos Santos ECL, López AMQ, da Silva JCS, Figueiredo IM, Santos JCC. Molecular interaction of sulfonamides and ovalbumin, an allergenic egg protein, exploring biophysical, theoretical and biological studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 228:117747. [PMID: 31727521 DOI: 10.1016/j.saa.2019.117747] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Revised: 10/27/2019] [Accepted: 11/01/2019] [Indexed: 06/10/2023]
Abstract
Biophysical, theoretical and biological in vitro studies were carried out to evaluate the interaction of the main allergen protein of egg white (ovalbumin, OVA) with sulphonamides (SA): sulphathiazole (S1), sulfaquinoxaline (S2), sulfadimethoxine (S3) and sulfamethazine (S4). The binding constants for the OVA-SA supramolecular complexes ranged from 1.20 to 30.66 × 105 M-1, observing the following order of affinity: S1 > S2 > S4 > S3. The preferential forces in the stabilization of the OVA complexes with S2 and S3 were hydrogen bonds and Van der Waals forces, whereas for OVA-S1 and OVAS4, were electrostatic interactions. Interaction process led to a change in the native structure of the protein, which may potentiate its natural allergenicity. Cations Ca(II), Mg(II) and Fe(III) favor the interaction of OVA with S1 and S2. The theoretical studies performed were consistent with the spectroscopic data. Finally, it was found that the interaction process for sulfonamides evaluated with OVA change the inhibition activity profile these antibiotics against strains of Escherichia coli ATCC 25922 and Bacillus megaterium APFSG3isox, but not the minimal inhibitory concentration values.
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Affiliation(s)
- Ana Carolina Fradique de Lyra
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Campus A. C. Simões, 57072-900 Maceió, Alagoas, Brazil
| | - Amanda L Dos Santos Silva
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Campus A. C. Simões, 57072-900 Maceió, Alagoas, Brazil
| | - Elane Cristina L Dos Santos
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Campus A. C. Simões, 57072-900 Maceió, Alagoas, Brazil
| | - Ana Maria Queijeiro López
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Campus A. C. Simões, 57072-900 Maceió, Alagoas, Brazil
| | - Júlio Cosme S da Silva
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Campus A. C. Simões, 57072-900 Maceió, Alagoas, Brazil
| | - Isis Martins Figueiredo
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Campus A. C. Simões, 57072-900 Maceió, Alagoas, Brazil
| | - Josué Carinhanha Caldas Santos
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Campus A. C. Simões, 57072-900 Maceió, Alagoas, Brazil.
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13
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Liu L, Dai X, Kang H, Xu Y, Hao W. Structural and functional properties of hydrolyzed/glycosylated ovalbumin under spray drying and microwave freeze drying. FOOD SCIENCE AND HUMAN WELLNESS 2020. [DOI: 10.1016/j.fshw.2020.01.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Liu L, Hao W, Dai X, Zhu Y, Chen K, Yang X. Enzymolysis kinetics and structural-functional properties of high-intensity ultrasound-assisted alkali pretreatment ovalbumin. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2020. [DOI: 10.1080/10942912.2020.1713152] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Lili Liu
- College of Food and Bioengineering, National Experimental Teaching Demonstration Center for Food Processing and Security, Henan University of Science and Technology, Luoyang, China
| | - Weiming Hao
- College of Food and Bioengineering, National Experimental Teaching Demonstration Center for Food Processing and Security, Henan University of Science and Technology, Luoyang, China
| | - Xiaoning Dai
- College of Food and Bioengineering, National Experimental Teaching Demonstration Center for Food Processing and Security, Henan University of Science and Technology, Luoyang, China
| | - Yang Zhu
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou, China
| | - Ke Chen
- College of Food and Bioengineering, National Experimental Teaching Demonstration Center for Food Processing and Security, Henan University of Science and Technology, Luoyang, China
| | - Xiaopan Yang
- College of Food and Bioengineering, National Experimental Teaching Demonstration Center for Food Processing and Security, Henan University of Science and Technology, Luoyang, China
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15
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Madhu P, Mukhopadhyay S. Preferential Recruitment of Conformationally Distinct Amyloid-β Oligomers by the Intrinsically Disordered Region of the Human Prion Protein. ACS Chem Neurosci 2020; 11:86-98. [PMID: 31808343 DOI: 10.1021/acschemneuro.9b00646] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Soluble oligomeric species of the amyloid-β (Aβ) peptide exhibit pronounced neurotoxic effects in Alzheimer's disease. Recent studies have indicated that the prion protein (PrP) is one of the cell-surface receptors, so-called a bad receptor, of Aβ oligomers that mediates downstream cellular toxicity. A rational classification of Aβ oligomers on the basis of conformation indicates that there are two distinct types of oligomers, namely, prefibrillar and fibrillar oligomers that are positive to A11 and OC conformation-dependent antibodies, respectively. The mechanism of heterotypic assembly of conformationally distinct oligomers and PrP is poorly understood. In this work, using an array of biophysical and biochemical tools, we dissect the molecular mechanism of the interaction of A11- and OC-positive Aβ42 oligomers with human PrP. Using site-specific binding titrations, we show that the recruitment of Aβ oligomers primarily occurs via the electrostatic interaction between the N-terminal intrinsically disordered region of PrP and Aβ oligomers. Our results demonstrate that OC-positive fibrillar oligomers possessing in-register parallel β-sheet packing displayed ∼30 times stronger binding with PrP compared to A11-positive oligomers. We also show that these OC-positive oligomers exacerbate their toxic effects on mammalian cells upon binding to PrP. On the contrary, the addition of PrP does not alter the toxicity exhibited by A11-positive oligomers. Our findings suggest that strategies targeting the interaction between PrP and OC-positive oligomers, which have been shown to be highly concentrated in the vicinity of amyloid plaques, may have therapeutic potential against Alzheimer's disease.
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16
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Dantas MDDA, Silva MDM, Silva ON, Franco OL, Fensterseifer ICM, Tenório HDA, Pereira HJV, Figueiredo IM, Santos JCC. Interactions of tetracyclines with milk allergenic protein (casein): a molecular and biological approach. J Biomol Struct Dyn 2019; 38:5389-5400. [PMID: 31814537 DOI: 10.1080/07391102.2019.1702587] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Tetracycline (TC), oxytetracycline (OTC), and chlortetracycline (CTC) interactions with the allergenic milk protein casein (CAS) were here evaluated simulating food conditions. The antibiotics assessed interact with CAS through static quenching and form non-fluorescent complexes. At 30 °C, the binding constant (Kb) varied from 0.05 to 1.23 × 106 M-1. Tetracycline interacts with CAS preferably through electrostatic forces, while oxytetracycline and chlortetracycline interactions occur by hydrogen bonds and van der Waals forces. The interaction process is spontaneous, and the magnitude of interaction based on Kb values, followed the order: TC < CTC < OTC. The distances between the donor (protein) and the receptors (TC, OTC, and CTC) were determined by Förster resonance energy transfer (FRET) and varied from 3.67 to 4.08 nm. Under natural feeding conditions, the citrate decreased the affinity between TC and CAS; a similar effect was observed for OTC in the presence of Ca(II), Fe(III) and lactose. Synchronized and three-dimensional (3D) fluorescence studies indicated alterations in the original protein conformation due to the interaction process, which may influence allergenic processes. In addition, complexation with CAS modulated the antimicrobial activity of CTC against S. aureus, demonstrated that the interaction process possibly alters the biological properties of antibiotics and the own protein, in the food conditions.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
| | | | - Osmar Nascimento Silva
- S-Inova Biotech, Post-Graduate Program in Biotechnology, Dom Bosco Catholic University, Campo Grande, Brazil
| | - Octavio Luiz Franco
- S-Inova Biotech, Post-Graduate Program in Biotechnology, Dom Bosco Catholic University, Campo Grande, Brazil
| | | | | | - Hugo Juarez V Pereira
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Maceió, Brazil
| | - Isis M Figueiredo
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, Maceió, Brazil
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17
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Wei Z, Zhu P, Huang Q. Investigation of ovotransferrin conformation and its complexation with sugar beet pectin. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2018.08.036] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Bhasne K, Sebastian S, Jain N, Mukhopadhyay S. Synergistic Amyloid Switch Triggered by Early Heterotypic Oligomerization of Intrinsically Disordered α-Synuclein and Tau. J Mol Biol 2018; 430:2508-2520. [PMID: 29704492 DOI: 10.1016/j.jmb.2018.04.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 04/05/2018] [Accepted: 04/16/2018] [Indexed: 12/31/2022]
Abstract
Amyloidogenic intrinsically disordered proteins, α-synuclein and tau are linked to Parkinson's disease and Alzheimer's disease, respectively. A body of evidence suggests that α-synuclein and tau, both present in the presynaptic nerve terminals, co-aggregate in many neurological ailments. The molecular mechanism of α-synuclein-tau hetero-assembly is poorly understood. Here we show that amyloid formation is synergistically facilitated by heterotypic association mediated by binding-induced misfolding of both α-synuclein and tau K18. We demonstrate that the intermolecular association is largely driven by the electrostatic interaction between the negatively charged C-terminal segment of α-synuclein and the positively charged tau K18 fragment. This heterotypic association results in rapid formation of oligomers that readily mature into hetero-fibrils with a much shorter lag phase compared to the individual proteins. These findings suggested that the critical intermolecular interaction between α-synuclein and tau can promote facile amyloid formation that can potentially lead to efficient sequestration of otherwise long-lived lethal oligomeric intermediates into innocuous fibrils. We next show that a well-known familial Parkinson's disease mutant (A30P) that is known to aggregate slowly via accumulation of highly toxic oligomeric species during the long lag phase converts into amyloid fibrils significantly faster in the presence of tau K18. The early intermolecular interaction profoundly accelerates the fibrillation rate of A30P α-synuclein and impels the disease mutant to behave similar to wild-type α-synuclein in the presence of tau. Our findings suggest a mechanistic underpinning of bypassing toxicity and suggest a general strategy by which detrimental amyloidogenic precursors are efficiently sequestered into more benign amyloid fibrils.
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Affiliation(s)
- Karishma Bhasne
- Centre for Protein Science, Design and Engineering, Indian Institute of Science Education and Research (IISER) Mohali, Punjab, India; Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Punjab, India
| | - Sanjana Sebastian
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Punjab, India
| | - Neha Jain
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Punjab, India; Present address: Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, Ahmedabad, Gujarat, India
| | - Samrat Mukhopadhyay
- Centre for Protein Science, Design and Engineering, Indian Institute of Science Education and Research (IISER) Mohali, Punjab, India; Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Punjab, India; Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Punjab, India.
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19
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Dantas MDDA, Tenório HDA, Lopes TIB, Pereira HJV, Marsaioli AJ, Figueiredo IM, Santos JCC. Interactions of tetracyclines with ovalbumin, the main allergen protein from egg white: Spectroscopic and electrophoretic studies. Int J Biol Macromol 2017; 102:505-514. [DOI: 10.1016/j.ijbiomac.2017.04.052] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 02/08/2017] [Accepted: 04/12/2017] [Indexed: 11/29/2022]
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20
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Gruia F, Parupudi A, Baca M, Ward C, Nyborg A, Remmele RL, Bee JS. Impact of Mutations on the Higher Order Structure and Activity of a Recombinant Uricase. J Pharm Sci 2017; 106:1018-1024. [DOI: 10.1016/j.xphs.2016.12.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 12/06/2016] [Accepted: 12/23/2016] [Indexed: 11/28/2022]
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21
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Xiong W, Wang Y, Zhang C, Wan J, Shah BR, Pei Y, Zhou B, Li J, Li B. High intensity ultrasound modified ovalbumin: Structure, interface and gelation properties. ULTRASONICS SONOCHEMISTRY 2016; 31:302-9. [PMID: 26964953 DOI: 10.1016/j.ultsonch.2016.01.014] [Citation(s) in RCA: 160] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 01/12/2016] [Accepted: 01/13/2016] [Indexed: 05/08/2023]
Abstract
Influence of high intensity ultrasound (HIUS) on the structure and properties of ovalbumin (OVA) were investigated. It was found that the subunits and secondary structure of OVA did not change significantly with HIUS treatment from the electrophoretic patterns and circular dichroism (CD) spectrum. The amount of free sulfhydryl groups increased and intrinsic fluorescence spectra analysis indicated changes in the tertiary structure and partial unfold of OVA after sonication increased. Compared with the untreated OVA, HIUS treatment increased the emulsifying activity and foaming ability, and decreased interface tension (oil-water and air-water interface), which due to the increased surface hydrophobicity and decreased the surface net charge in OVA, while the emulsifying and foaming stability had no remarkable differences. The increased particle size may be attributed to formation of protein aggregates. Moreover, the gelation temperatures of HIUS-treated samples were higher than the untreated OVA according to the temperature sweep model rheology, and this effect was consistent with the increased in surface hydrophobicity for ultrasound treated OVA. These changes in functional properties of OVA would promote its application in food industry.
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Affiliation(s)
- Wenfei Xiong
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology (Huazhong Agricultural University), Ministry of Education, China; Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei University of Technology, Wuhan 430068, China
| | - Yuntao Wang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology (Huazhong Agricultural University), Ministry of Education, China; Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei University of Technology, Wuhan 430068, China
| | - Chunlan Zhang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology (Huazhong Agricultural University), Ministry of Education, China; Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei University of Technology, Wuhan 430068, China
| | - Jiawei Wan
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology (Huazhong Agricultural University), Ministry of Education, China; Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei University of Technology, Wuhan 430068, China
| | - Bakht Ramin Shah
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology (Huazhong Agricultural University), Ministry of Education, China; Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei University of Technology, Wuhan 430068, China
| | - Yaqiong Pei
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology (Huazhong Agricultural University), Ministry of Education, China; Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei University of Technology, Wuhan 430068, China
| | - Bin Zhou
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology (Huazhong Agricultural University), Ministry of Education, China; Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei University of Technology, Wuhan 430068, China
| | - Jin Li
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology (Huazhong Agricultural University), Ministry of Education, China; Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei University of Technology, Wuhan 430068, China
| | - Bin Li
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei, China; Key Laboratory of Environment Correlative Dietology (Huazhong Agricultural University), Ministry of Education, China; Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei University of Technology, Wuhan 430068, China.
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22
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Narang D, Singh A, Mukhopadhyay S. Stepwise unfolding of human β2-microglobulin into a disordered amyloidogenic precursor at low pH. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2016; 46:65-76. [DOI: 10.1007/s00249-016-1138-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 04/20/2016] [Accepted: 05/10/2016] [Indexed: 02/08/2023]
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23
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Lee JJ, Shim A, Lee SY, Kwon BE, Kim SR, Ko HJ, Cho HJ. Ready-to-use colloidal adjuvant systems for intranasal immunization. J Colloid Interface Sci 2016; 467:121-128. [PMID: 26775242 DOI: 10.1016/j.jcis.2016.01.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 12/31/2015] [Accepted: 01/05/2016] [Indexed: 11/19/2022]
Abstract
Adjuvant systems based on oil-in-water (o/w) microemulsions (MEs) for vaccination via intranasal administration were prepared and evaluated. A ready-to-use blank ME system composed of mineral oil (oil), Labrasol (surfactant), Tween 80 (cosurfactant), and water was prepared and blended with antigen (Ag) solution prior to use. The o/w ME system developed exhibited nano-size droplets within the tested range of Ag concentrations and dilution factors. The maintenance of primary, secondary, and tertiary structural stability of ovalbumin (OVA) in ME, compared with OVA in solution, was demonstrated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), circular dichroism (CD), and fluorescence intensity measurements, respectively. The uptake efficiency in RAW 264.7 cells, evaluated by flow cytometry, of OVA in the ME group was significantly higher than that of the OVA solution group (p<0.05). In an intranasal immunization study with OVA ME in mice, elevated adjuvant effects in terms of mucosal immunization and Th1-dominant cell-mediated immune responses were identified. Given the convenience of use (simply mixing with Ag solution prior to use) and the adjuvant effects after intranasal immunization, the new o/w ME may be a practical and efficient adjuvant system for intranasal vaccination.
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Affiliation(s)
- Jeong-Jun Lee
- College of Pharmacy, Kangwon National University, Chuncheon 200-701, Republic of Korea
| | - Aeri Shim
- Laboratory of Microbiology and Immunology, College of Pharmacy, Kangwon National University, Chuncheon, Republic of Korea
| | - Song Yi Lee
- College of Pharmacy, Kangwon National University, Chuncheon 200-701, Republic of Korea
| | - Bo-Eun Kwon
- Laboratory of Microbiology and Immunology, College of Pharmacy, Kangwon National University, Chuncheon, Republic of Korea
| | - Seong Ryeol Kim
- Laboratory of Microbiology and Immunology, College of Pharmacy, Kangwon National University, Chuncheon, Republic of Korea
| | - Hyun-Jeong Ko
- Laboratory of Microbiology and Immunology, College of Pharmacy, Kangwon National University, Chuncheon, Republic of Korea.
| | - Hyun-Jong Cho
- College of Pharmacy, Kangwon National University, Chuncheon 200-701, Republic of Korea.
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24
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Alam P, Naseem F, Abdelhameed AS, Khan RH. Effect of galactose on acid induced molten globule state of Soybean Agglutinin: Biophysical approach. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.05.061] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Applications of Fluorescence Anisotropy in Understanding Protein Conformational Disorder and Aggregation. PROGRESS IN OPTICAL SCIENCE AND PHOTONICS 2015. [DOI: 10.1007/978-981-287-242-5_3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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26
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Crowded milieu prevents fibrillation of hen egg white lysozyme with retention of enzymatic activity. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2014; 138:8-16. [DOI: 10.1016/j.jphotobiol.2014.04.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 04/22/2014] [Accepted: 04/24/2014] [Indexed: 11/18/2022]
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27
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Ghosh S, Pandey NK, Banerjee P, Chaudhury K, Nagy NV, Dasgupta S. Copper(II) directs formation of toxic amorphous aggregates resulting in inhibition of hen egg white lysozyme fibrillation under alkaline salt-mediated conditions. J Biomol Struct Dyn 2014; 33:991-1007. [PMID: 24806136 DOI: 10.1080/07391102.2014.921864] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Hen egg white lysozyme (HEWL) adopts a molten globule-like state at high pH (~12.75) and is found to form amyloid fibrils at alkaline pH. Here, we report that Cu(II) inhibits self-association of HEWL at pH 12.75 both at 37 and 65 °C. A significant reduction in Thioflavin T fluorescence intensity, attenuation in β-sheet content and reduction in hydrophobic exposure were observed with increasing Cu(II) stoichiometry. Electron paramagnetic resonance spectroscopy suggests a 4N type of coordination pattern around Cu(II) during fibrillation. Cu(II) is also capable of altering the cytotoxicity of the proteinaceous aggregates. Fibrillar species of diverse morphology were found in the absence of Cu(II) with the generation of amorphous aggregates in the presence of Cu(II), which are more toxic compared to the fibrils alone.
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Affiliation(s)
- Sudeshna Ghosh
- a Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , India
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28
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Du X, Dubin PL, Hoagland DA, Sun L. Protein-Selective Coacervation with Hyaluronic Acid. Biomacromolecules 2014; 15:726-34. [DOI: 10.1021/bm500041a] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
| | | | | | - Lianhong Sun
- School
of Life Sciences, University of Science and Technology of China, Hefei, Anhui, People’s Republic of China, 230027
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29
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Ma XJ, Gao JY, Chen HB. Combined effect of glycation and sodium carbonate-bicarbonate buffer concentration on IgG binding, IgE binding and conformation of ovalbumin. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2013; 93:3209-3215. [PMID: 23553593 DOI: 10.1002/jsfa.6157] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 03/05/2013] [Accepted: 04/02/2013] [Indexed: 06/02/2023]
Abstract
BACKGROUND Ovalbumin (OVA) is a major allergen in hen egg. During thermal processing, reducing sugars contained in the hen egg white might easily undergo glycation with OVA, but few studies have been conducted on its corresponding immunoreactivity changes. The aim of the present study was to assess changes of the antigenicity, potential allergenicity and conformation of OVA after glycation in a wet-thermal processing system under different concentrations of sodium carbonate-bicarbonate buffer. RESULTS IgE binding of the glycated OVA was increased after glycation, and the higher the sodium carbonate-bicarbonate buffer concentration, the higher the IgE binding capacity. The increase in IgE binding of OVA corresponded well with the disruption of the disulfide bond, which exposed the epitopes initially buried. Antigenicity of the glycated OVA was increased, and the amount of the increase varied among samples treated under different buffer concentrations. CONCLUSION Glycation increased the allergenic potential for OVA, with the amount of increase varying with different sodium carbonate-bicarbonate buffer concentrations.
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Affiliation(s)
- Xiao-juan Ma
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, 330047, China; Sino-German Joint Research Institute, Nanchang University, Nanchang, 330047, China
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30
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Subpicomolar sensing of hydrogen peroxide with ovalbumin-embedded chitosan/polystyrene sulfonate multilayer membrane. Anal Biochem 2013; 440:49-55. [DOI: 10.1016/j.ab.2013.04.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Revised: 04/26/2013] [Accepted: 04/29/2013] [Indexed: 11/21/2022]
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31
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Narang D, Sharma PK, Mukhopadhyay S. Dynamics and dimension of an amyloidogenic disordered state of human β2-microglobulin. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2013; 42:767-76. [DOI: 10.1007/s00249-013-0923-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 07/18/2013] [Accepted: 08/12/2013] [Indexed: 12/11/2022]
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32
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Bhattacharya M, Jain N, Dogra P, Samai S, Mukhopadhyay S. Nanoscopic Amyloid Pores Formed via Stepwise Protein Assembly. J Phys Chem Lett 2013; 4:480-485. [PMID: 26281744 DOI: 10.1021/jz3019786] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Protein aggregation leading to various nanoscale assemblies is under scrutiny due to its implications in a broad range of human diseases. In the present study, we have used ovalbumin, a model non-inhibitory serpin, to elucidate the molecular events involved in amyloid assembly using a diverse array of spectroscopic and imaging tools such as fluorescence, laser Raman, circular dichroism spectroscopy, and atomic force microscopy (AFM). The AFM images revealed a progressive morphological transition from spherical oligomers to nanoscopic annular pores that further served as templates for higher-order supramolecular assembly into larger amyloid pores. Raman spectroscopic investigations illuminated in-depth molecular details into the secondary structural changes of the protein during amyloid assembly and pore formation. Additionally, Raman measurements indicated the presence of antiparallel β-sheets in the amyloid core. Overall, our studies revealed that the protein conformational switch in the context of the oligomers triggers the hierarchical assembly into nanoscopic amyloid pores. Our results will have broad implications in the structural characterization of amyloid pores derived from a variety of disease-related proteins.
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Affiliation(s)
- Mily Bhattacharya
- †Department of Chemical Sciences and ‡Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Mohali, Knowledge City, Sector 81, S.A.S. Nagar, Mohali-140306, India
| | - Neha Jain
- †Department of Chemical Sciences and ‡Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Mohali, Knowledge City, Sector 81, S.A.S. Nagar, Mohali-140306, India
| | - Priyanka Dogra
- †Department of Chemical Sciences and ‡Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Mohali, Knowledge City, Sector 81, S.A.S. Nagar, Mohali-140306, India
| | - Soumyadyuti Samai
- †Department of Chemical Sciences and ‡Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Mohali, Knowledge City, Sector 81, S.A.S. Nagar, Mohali-140306, India
| | - Samrat Mukhopadhyay
- †Department of Chemical Sciences and ‡Department of Biological Sciences, Indian Institute of Science Education and Research (IISER), Mohali, Knowledge City, Sector 81, S.A.S. Nagar, Mohali-140306, India
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Thakkar SV, Kim JH, Samra HS, Sathish HA, Bishop SM, Joshi SB, Volkin DB, Middaugh CR. Local Dynamics and Their Alteration by Excipients Modulate the Global Conformational Stability of an lgG1 Monoclonal Antibody. J Pharm Sci 2012; 101:4444-57. [DOI: 10.1002/jps.23332] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 08/18/2012] [Accepted: 09/11/2012] [Indexed: 12/11/2022]
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