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Baruah I, Borgohain G. Temperature dependent molecular dynamics simulation study to understand the stabilizing effect of NADES on the protein β-Lactoglobulin. J Mol Graph Model 2023; 125:108582. [PMID: 37595383 DOI: 10.1016/j.jmgm.2023.108582] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 07/24/2023] [Accepted: 07/28/2023] [Indexed: 08/20/2023]
Abstract
The thermal stability of a protein is an important concern for its practical application in food processing industries. In this study, we have carried out classical molecular dynamics simulations to systematically investigate the effect of NADES (natural deep eutectic solvent) on the stabilization of the protein β-Lactoglobulin (BLG) at different temperatures. This study sheds light on the very aspects of NADES composed of betaine and sorbitol on the stability of the protein. NADES provides better stability to the protein up to a temperature of 400 K than in water. It is observed that the protein starts to unfold above temperature 400 K in spite of the presence of NADES which is quiet evident from the root mean square deviation (RMSD) and radius of gyration (Rg) plots. The decreasing average solvent accessible surface area (SASA) values and increasing intra-protein hydrogen bonds indicate better stability of the protein in NADES medium than in water at temperatures 300 K and 400 K. At high temperatures viz. 450 K and 500 K the number and distribution of solvent species (betaine and sorbitol) around the protein surface show an increment that are evident from the calculations of solvation shell, radial and spatial distribution functions. Increased number of betaine molecules that interact with the protein through electrostatic interaction may lead to destabilization of the protein at these temperatures. This study suggests that NADES could be used as an ideal medium for thermal stability of the protein BLG up to a temperature of 400 K. Beyond this temperature, NADES used for this study fails to exert stabilization effect on the protein.
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Affiliation(s)
- Indrani Baruah
- Department of Chemistry, Cotton University, Guwahati, Assam, 781001, India
| | - Gargi Borgohain
- Department of Chemistry, Cotton University, Guwahati, Assam, 781001, India.
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2
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Deng Z, Xia Y, Chen L, Zhao Y, Wang R, Liang G. Insight into covalent conjugates of β-lactoglobulin with rutin: Characterizing allergenicity, digestibility, and antioxidant properties in vitro. Food Res Int 2023; 173:113401. [PMID: 37803745 DOI: 10.1016/j.foodres.2023.113401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 08/22/2023] [Accepted: 08/26/2023] [Indexed: 10/08/2023]
Abstract
β-lactoglobulin (β-LG) is an essential nutrient in milk, but it is the primary allergen causing dairy allergy in humans. Currently, researchers are focusing on using flavonoids to covalently modify β-LG for improving its functionality. However, the impact and underlying mechanisms of rutin covalent modification on the functional properties and allergenicity of β-LG remain unclear. Here, we aim to investigate the changes in allergenicity, digestive characteristics, and antioxidant properties of β-LG after covalent modification using a combination of spectroscopy, enzyme-linked immunosorbent assay (ELISA), simulated digestion, and antioxidant assays. The results indicate that rutin forms covalent bonds with the free amino group, sulfhydryl group, and tryptophan of β-LG, leading to alterations in the secondary structure of β-LG. Furthermore, the modified β-LG exhibits improved antioxidant capacity and decreased allergenicity, along with reduced resistance to pancreatin digestion in vitro. This study provides novel insights and strategies to expand the functional application of β-LG.
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Affiliation(s)
- Zhifen Deng
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400030, China
| | - Yuting Xia
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400030, China
| | - Lang Chen
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400030, China
| | - Yi Zhao
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400030, China
| | - Ruihong Wang
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400030, China
| | - Guizhao Liang
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, Bioengineering College, Chongqing University, Chongqing 400030, China.
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3
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Chunder R, Heider T, Kuerten S. The prevalence of IgG antibodies against milk and milk antigens in patients with multiple sclerosis. Front Immunol 2023; 14:1202006. [PMID: 37492579 PMCID: PMC10364054 DOI: 10.3389/fimmu.2023.1202006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 06/21/2023] [Indexed: 07/27/2023] Open
Abstract
Introduction Multiple sclerosis (MS) is a chronic demyelinating disease of the central nervous system (CNS). The pathophysiology of MS is complex and is said to be influenced by multiple environmental determinants, including diet. We and others have previously demonstrated how consumption of bovine milk can aggravate disease severity in MS patients, which can be explained by molecular mimicry between milk antigens and those expressed within the CNS. In this study we set out to identify alternatives to drinking cow milk which might be less detrimental to MS patients who have a genetic predisposition towards developing antibody titers against bovine milk antigens that cross-react with CNS antigens. Methods To this end, we screened 35 patients with MS and 20 healthy controls for their IgG reactivity against an array of animal-sourced milk, plant-based alternatives as well as individual antigens from bovine milk. Results We demonstrate that MS patients have a significantly higher IgG response to animal-sourced milk, especially cow milk, in comparison to healthy donors. We also show that the reactivity to cow milk in MS patients can be attributed to reactivity against different bovine milk antigens. Finally, our correlation data indicate the co-existence of antibodies to individual bovine milk antigens and their corresponding cross-reactive CNS antigens. Discussion Taken together, we suggest screening of blood from MS patients for antibodies against different types of milk and milk antigens in order to establish a personalized diet regimen.
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Affiliation(s)
- Rittika Chunder
- Institute of Neuroanatomy, Medical Faculty, University of Bonn, Bonn, Germany
| | - Thorsten Heider
- Clinic for Neurology, Klinikum St. Marien Amberg, Amberg, Germany
| | - Stefanie Kuerten
- Institute of Neuroanatomy, Medical Faculty, University of Bonn, Bonn, Germany
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4
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Differentially expressed whey proteins of donkey and bovine colostrum revealed with a label-free proteomics approach. FOOD SCIENCE AND HUMAN WELLNESS 2023. [DOI: 10.1016/j.fshw.2022.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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5
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Mckerchar HJ, Lento C, Bennie RZ, Crowther JM, Dolamore F, Dyer JM, Clerens S, Mercadante D, Wilson DJ, Dobson RCJ. The protein dynamics of bovine and caprine β-lactoglobulin differ as a function of pH. Food Chem 2023; 408:135229. [PMID: 36563618 DOI: 10.1016/j.foodchem.2022.135229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 11/28/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022]
Abstract
The properties of milk proteins differ between mammalian species. β-Lactoglobulin (βlg) proteins from caprine and bovine milk are sequentially and structurally highly similar, yet their physicochemical properties differ, particularly in response to pH. To resolve this conundrum, we compared the dynamics of both the monomeric and dimeric states for each homologue at pH 6.9 and 7.5 using hydrogen/deuterium exchange experiments. At pH 7.5, the rate of exchange is similar across both homologues, but at pH 6.9 the dimeric states of the bovine βlg B variant homologue have significantly more conformational flexibility compared with caprine βlg. Molecular dynamics simulations provide a mechanistic rationale for the experimental observations, revealing that variant-specific substitutions encode different conformational ensembles with different dynamic properties consistent with the hydrogen/deuterium exchange experiments. Understanding the dynamic differences across βlg homologues is essential to understand the different responses of these milks to processing, human digestion, and differences in immunogenicity.
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Affiliation(s)
- Hannah J Mckerchar
- Biomolecular Interaction Centre, School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand; Riddet Institute, based at Massey University, Palmerston North 4442, New Zealand; Protein and Metabolites Team, AgResearch Lincoln Research Centre, Lincoln 7608, New Zealand
| | - Cristina Lento
- Department of Chemistry, York University, Toronto, Ontario M3J 1P3, Canada
| | - Rachel Z Bennie
- Biomolecular Interaction Centre, School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand
| | - Jennifer M Crowther
- Biomolecular Interaction Centre, School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand
| | - Fabian Dolamore
- Biomolecular Interaction Centre, School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand
| | - Jolon M Dyer
- Biomolecular Interaction Centre, School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand; The New Zealand Institute for Plant and Food Research, Lincoln Research Centre, Lincoln 7608, New Zealand; Department of Wine, Food and Molecular Biosciences, Lincoln University, Lincoln 7647, New Zealand
| | - Stefan Clerens
- Biomolecular Interaction Centre, School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand; Riddet Institute, based at Massey University, Palmerston North 4442, New Zealand; Protein and Metabolites Team, AgResearch Lincoln Research Centre, Lincoln 7608, New Zealand
| | - Davide Mercadante
- School of Chemical Sciences, The University of Auckland, Auckland 1010, New Zealand
| | - Derek J Wilson
- Department of Chemistry, York University, Toronto, Ontario M3J 1P3, Canada; Centre for Research in Mass Spectrometry, Toronto, Ontario M3J 1P3, Canada
| | - Renwick C J Dobson
- Biomolecular Interaction Centre, School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand; Riddet Institute, based at Massey University, Palmerston North 4442, New Zealand; Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Victoria 3010, Australia.
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6
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Racz CP, Racz LZ, Floare CG, Tomoaia G, Horovitz O, Riga S, Kacso I, Borodi G, Sarkozi M, Mocanu A, Roman C, Tomoaia-Cotisel M. Curcumin and whey protein concentrate binding: Thermodynamic and structural approach. Food Hydrocoll 2023. [DOI: 10.1016/j.foodhyd.2023.108547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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7
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Cosenza G, Martin P, Garro G, Gallo D, Auzino B, Ciampolini R, Pauciullo A. A novel allelic donkey β-lactogobulin I protein isoform generated by a non-AUG translation initiation codon is associated with a nonsynonymous SNP. J Dairy Sci 2023; 106:4158-4170. [PMID: 37080792 DOI: 10.3168/jds.2022-22598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Accepted: 12/17/2022] [Indexed: 04/22/2023]
Abstract
β-Lactoglobulin I (β-LG I) is one of the most important whey proteins in donkey milk. However, to our knowledge, there has been no study focusing on the full nucleotide sequences of this gene (BLG I). Current investigation of donkey BLG I gene is very limited with only 2 variants (A and B) characterized so far at the protein level. Recently, a new β-LG I variant, with a significantly higher mass (+1,915 Da) than known variants has been detected. In this study, we report the whole nucleotide sequence of the BLG I gene from 2 donkeys, whose milk samples are characterized by the β-LG I SDS-PAGE band with a normal electrophoretic mobility (18,514.25 Da, β-LG I B1 form) the first, and by the presence of a unique β-LG I band with a higher electrophoretic mobility (20,428.5 Da, β-LG I D form) the latter. A high genetic variability was found all over the 2 sequenced BLG I alleles. In particular, 16 polymorphic sites were found in introns, one in the 5' flanking region, 3 SNPs in the 5' untranslated region and one SNP in the coding region (g.458G > A) located at the 40th nucleotide of exon 2 and responsible for the AA substitutions p.Asp28 > Asn in the mature protein. Two SNPs (g.920-922CAC > TGT and g.1871G/A) were genotyped in 93 donkeys of 2 Italian breeds (60 Ragusana and 33 Amiatina, respectively) and the overall frequencies of g.920-922CAC and g.1871A were 0.3065 and 0.043, respectively. Only the rare allele g.1871A was observed to be associated with the slower migrating β-LG I. Considering this genetic diversity and those found in the database, it was possible to deduce at least 5 different alleles (BLG I A, B, B1, C, D) responsible for 4 potential β-LG I translations. Among these alleles, B1 and D are those characterized in the present research, with the D allele of real novel identification. Haplotype data analysis suggests an evolutionary pathway of donkey BLG I gene and a possible phylogenetic map is proposed. Analyses of mRNA secondary structure showed relevant changes in the structures, as consequence of the g.1871G > A polymorphism, that might be responsible for the recognition of an alternative initiation site providing an additional signal peptide. The extension of 19 AA sequence to the mature protein, corresponding to the canonical signal peptide with an additional alanine residue, is sufficient to provide the observed molecular weight of the slower migrating β-LG I encoded by the BLG I D allele.
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Affiliation(s)
- G Cosenza
- Department of Agricultural Sciences, University of Naples "Federico II," 80055 Portici (Na), Italy.
| | - P Martin
- Université Paris-Saclay, INRAE, MICALIS Institute, PAPPSO, 78350 Jouy-en-Josas, France
| | - G Garro
- Department of Agricultural Sciences, University of Naples "Federico II," 80055 Portici (Na), Italy
| | - D Gallo
- Department of Agricultural Sciences, University of Naples "Federico II," 80055 Portici (Na), Italy
| | - B Auzino
- Department of Veterinary Science, University of Pisa, 56100, Italy
| | - R Ciampolini
- Department of Veterinary Science, University of Pisa, 56100, Italy.
| | - A Pauciullo
- Department of Agriculture, Forest and Food Sciences, University of Torino, 10095 Grugliasco (TO), Italy
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8
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Komatsu Y, Tsuda M, Wada Y, Shibasaki T, Nakamura H, Miyaji K. Nutritional Evaluation of Milk-, Plant-, and Insect-Based Protein Materials by Protein Digestibility Using the INFOGEST Digestion Method. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:2503-2513. [PMID: 36695832 DOI: 10.1021/acs.jafc.2c07273] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The INFOGEST method is a valuable tool for understanding and monitoring food digestion as an alternative to in vivo assays. However, few studies have compared animal and alternative protein sources in terms of protein quality using the INFOGEST method. This study aimed to evaluate the protein quality of milk-, plant-, and insect-based protein materials by in vitro protein digestibility and in vitro digestible indispensable amino acid score (DIAAS), following the INFOGEST method. Milk-based protein materials had the highest protein digestibility (86.1-90.8%), followed by soy (85.1%) and wheat (82.3%). These materials had significantly higher protein digestibility compared with zein (65.1%), cricket (63.6%), and mealworm (69.5%). Additionally, the mean values of in vitro DIAAS of milk-based protein materials (105.0-137.5) were higher than those of plant- and insect-based protein materials (1.9-91.0). Milk-based protein materials have higher protein quality than plant- and insect-based protein materials by the nutritional evaluation following the INFOGEST digestion method.
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Affiliation(s)
- Yosuke Komatsu
- Health Care & Nutritional Science Institute, Morinaga Milk Industry Co. Ltd., Zama252-8583, Japan
- Center for Food and Medical Innovation Promotion, Institute for the Promotion of Business-Regional Collaboration of Hokkaido University, Sapporo001-0021, Japan
| | - Muneya Tsuda
- Health Care & Nutritional Science Institute, Morinaga Milk Industry Co. Ltd., Zama252-8583, Japan
| | - Yasuaki Wada
- Health Care & Nutritional Science Institute, Morinaga Milk Industry Co. Ltd., Zama252-8583, Japan
- Center for Food and Medical Innovation Promotion, Institute for the Promotion of Business-Regional Collaboration of Hokkaido University, Sapporo001-0021, Japan
| | - Takuya Shibasaki
- Health Care & Nutritional Science Institute, Morinaga Milk Industry Co. Ltd., Zama252-8583, Japan
| | - Hirohiko Nakamura
- Health Care & Nutritional Science Institute, Morinaga Milk Industry Co. Ltd., Zama252-8583, Japan
| | - Kazuhiro Miyaji
- Health Care & Nutritional Science Institute, Morinaga Milk Industry Co. Ltd., Zama252-8583, Japan
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9
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Yoshida T, Ikeda R, Kawai S, Horiuchi K, Matsuo Y, Hattori M. Reduced immunogenicity and endowed antimicrobial activity in β-lactoglobulin by preparing edible bioconjugate. Cytotechnology 2023; 75:39-47. [PMID: 36713066 PMCID: PMC9880099 DOI: 10.1007/s10616-022-00558-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 11/10/2022] [Indexed: 11/19/2022] Open
Abstract
β-lactoglobulin (BLG) and ε-polylysine (PL) were bound by using microbial transglutaminase. Dextran (Dex) was further conjugated to the BLG-PL conjugate by the Maillard reaction. Confirmation of conjugation was carried out by SDS-PAGE. From the results of isoelectric focusing, it was revealed that the isoelectric point of the BLG-PL conjugate was shifted to the basic side as compared with native BLG. Immunogenicity of BLG in BALB/c mice was lowered by conjugation with PL and further lowered by conjugation with Dex. By conjugation with PL and PL-Dex, antibacterial activity against Staphylococcus aureus was endowed to BLG. Because the conjugation method in this study is a safe method, it is valuable in that it can be applicable to food processing.
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Affiliation(s)
- Tadashi Yoshida
- Department of Applied Biological Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-Cho, Fuchu, Tokyo 183-8509 Japan
| | - Risa Ikeda
- Department of Applied Biological Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-Cho, Fuchu, Tokyo 183-8509 Japan
| | - Shinya Kawai
- Department of Applied Biological Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-Cho, Fuchu, Tokyo 183-8509 Japan
| | - Kengo Horiuchi
- Department of Applied Biological Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-Cho, Fuchu, Tokyo 183-8509 Japan
| | - Yuho Matsuo
- Department of Applied Biological Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-Cho, Fuchu, Tokyo 183-8509 Japan
| | - Makoto Hattori
- Department of Applied Biological Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-Cho, Fuchu, Tokyo 183-8509 Japan
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10
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Castillo O, Mancillas J, Hughes W, Brancaleon L. Characterization of the interaction of metal-protoporphyrins photosensitizers with β- lactoglobulin. Biophys Chem 2023; 292:106918. [PMID: 36399946 DOI: 10.1016/j.bpc.2022.106918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 10/24/2022] [Accepted: 10/27/2022] [Indexed: 11/17/2022]
Abstract
We investigated the interaction of a series of metal-protoporphyrins (PPIXs) with bovine β- lactoglobulin (BLG) using a combination of optical spectroscopy and computational simulations. Unlike other studies, the simulations were not merely used to rationalize the experimental data but were employed to refine the experimental data itself. The study was carried out at two pH values, 5 and 9, where BLG is known to have different conformation dictated by the so-called Tanford transition which occurs near pH 7.5. The transition is postulated to regulate access to the interior binding cavity of the protein, thus the pH variation was used as a parameter to investigate whether PPIXs access the central cavity of BLG. The results of our study show that indeed binding increases significantly at alkaline pH, however, the increased affinity is not due to the accessibility of the central cavity. Instead, binding appears to be determined by the tendency of PPIXs to form large inhomogeneous aggregates at acidic pH which hinders interactions with proteins. The binding site determined through a combination of experimental and computational methods is located at the interface between two BLG monomers where the long α-helix segment of the protein face each other. This region is rich in positively charged Lys residues that interact with the propionic acid chains of the protoporphyrins. Establishing the modality of binding between protoporphyrins and BLG would have important consequences for the use of BLG:PPIX complexes in applications such as artificial photoreceptors, artificial metallo-enzymes, delivery of photosensitizers for phototherapy and even solar energy conversion.
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Affiliation(s)
- Omar Castillo
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA
| | - James Mancillas
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA
| | - William Hughes
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA
| | - Lorenzo Brancaleon
- Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA.
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11
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Youn HY, Seo KH, Kim HJ, Kim YS, Kim H. Effect of postbiotics derived from kefir lactic acid bacteria-mediated bioconversion of citrus pomace extract and whey on high-fat diet-induced obesity and gut dysbiosis. Food Res Int 2022; 162:111930. [DOI: 10.1016/j.foodres.2022.111930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 09/05/2022] [Accepted: 09/08/2022] [Indexed: 11/29/2022]
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12
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Thampy A, Palani Kumar MK, Serva Peddha M, Reddy M. The effectiveness of whey proteins in prevention and treatment of cancer: a review. Crit Rev Food Sci Nutr 2022; 64:2088-2104. [PMID: 36111369 DOI: 10.1080/10408398.2022.2121256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Cancer prevalence is rising rapidly around the globe, contributing immensely to the burden on health systems, hence the search for more effective and selective treatments still remains enticing. Whey, as a natural source, has received extensive focus in recent years because of its intriguing applications to health benefits. Growing consumer appreciation of the nutraceutical effects of whey components makes them an attractive field within cancer research. Whey is a valuable source of superior-quality proteins, lactose, vitamins, and minerals that contribute to proper nutrition as well as help hamper illness and even complement certain disease-related therapy prognosis. As a result, industry leaders and dairy producers are devising new ways to valorize it. Great emphasis on cancer prevention and treatment has been given to whey protein (WP) by the scientific community. WP intake has been proven to induce anti-cancer effects in various in vitro and in vivo studies. Nutritionists and dietitians are now enormously endorsing the role of WP in the therapeutic field, notably for cancer cachexia management. However, human intervention studies with WP are in their infancy and remain to be established with different tumor entities to provide valid proof of its ability to act as a coadjuvant in cancer treatment.
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Affiliation(s)
- Anjana Thampy
- Department of Clinical Nutrition and Dietetics, Sri Devaraj Urs Academy of Higher Education and Research, Kolar, Karnataka, India
| | - Meena Kumari Palani Kumar
- Department of Biochemistry, CSIR-Central Food Technological Research Institute, Mysore, Karnataka, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
| | - Muthukumar Serva Peddha
- Department of Biochemistry, CSIR-Central Food Technological Research Institute, Mysore, Karnataka, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, India
| | - Madhavi Reddy
- Department of Clinical Nutrition and Dietetics, Sri Devaraj Urs Academy of Higher Education and Research, Kolar, Karnataka, India
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13
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Li H, Wang T, Su J, Van der Meeren P. Influence of pH and low/high- methoxy pectin complexation on the hydrophobic binding sites of β-lactoglobulin studied by a fluorescent probe method. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.108020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Jash A, Krueger A, Rizvi SSH. Venturi-based rapid expansion of supercritical solution (Vent-RESS): synthesis of liposomes for pH-triggered delivery of hydrophilic and lipophilic bioactives. GREEN CHEMISTRY : AN INTERNATIONAL JOURNAL AND GREEN CHEMISTRY RESOURCE : GC 2022; 24:5326-5337. [PMID: 36935900 PMCID: PMC10021132 DOI: 10.1039/d2gc00877g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Multivitamin-loaded and surface-modified liposomes tailored for simultaneous intestinal delivery of both lipophilic and hydrophilic bioactives were synthesized from sunflower phosphatidylcholine (SFPC). Liposomes (SL) were generated with the aid of a novel, organic solvent free, and environmentally benign process which utilizes venturi-based rapid expansion of supercritical solution (Vent-RESS). Vitamins E and C were used as model lipophilic and hydrophilic bioactives and demonstrated an average encapsulation efficiency of 92 and 70 %, respectively. Synthesized liposomes were coated with a pH-responsive double-wall of chitosan and β-lactoglobulin (βlg-Cs-SL) to develop a biocompatible vehicle for pH-triggered delivery of bioactive cargo(s). To compare the efficacy of this newly developed dual-coating, SL was also coated with a commercially available pH responsive polymer, Eudragit® S100 (Eu-SL). No organic solvent was used during the surface coating of SLs with these two different types of enteric coatings. The performance of these two coatings was studied by conducting morphological characterization through diameter and ζ-potential measurements along with confocal laser scanning and freeze-fracture cryogenic scanning electron microscopies. The stability of coated and uncoated SFPC liposomes was determined in simulated gastrointestinal fluids. For βlg-Cs-SL and Eu-SL, after 2 h of incubation in simulated gastric condition, less than 5 % of the encapsulated vitamins C and E were released, whereas for SL, 41 and 28 % of vitamins C and E were released within 2 h of incubation period. In simulated intestinal fluid, coated liposomes released most of their remaining payload when incubated for 4 h. The newly developed dual coating was found to be as effective as its commercially available counterpart, Eudragit® S100 coating; nevertheless, the biocompatible, non-toxic, and non-synthetic nature of this coating makes it an attractive alternative. Modeling the release kinetics of vitamins from coated liposome showed that the release of payload from surface coated liposomes proceeded through a multistep structural disintegration involving both Fickian and non-Fickian types of diffusion. The ability of these surface-coated liposomes to maintain structural integrity under the gastric condition followed by site-specific, pH-triggered release of encapsulated cargo in the intestine will make them highly suitable for oral administration of bioactive compounds in pharmaceutical and food applications.
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Affiliation(s)
- Apratim Jash
- Department of Food Science, Cornell University, Ithaca, NY 14850, USA
| | - Amy Krueger
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca NY 14850, USA
| | - Syed S. H. Rizvi
- Department of Food Science, Cornell University, Ithaca, NY 14850, USA
- School of Chemical and Biomolecular Engineering, Cornell University, Ithaca NY 14850, USA
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15
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Vinod SM, Sangeetha MS, Thamarai Selvan R, Shoba G, Tamizhdurai P, Kumaran R. Molecular docking approach on the molecular interactions involving beta-lactoglobulin (βLG)-4-Dicyanomethylene2,6-Dimethyl-4-Hpyran (DDP) dye in the presence of an antibiotic, norfloxacin. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Probing the ligand-binding pocket of recombinant β-lactoglobulin: Calorimetric and spectroscopic studies. Biophys Chem 2022; 283:106770. [DOI: 10.1016/j.bpc.2022.106770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/24/2022] [Accepted: 01/26/2022] [Indexed: 11/23/2022]
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17
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Sepay N, Banerjee M, Islam R, Dey SP, Halder UC. Crystallography-based exploration of non-covalent interactions for the design and synthesis of coumarin for stronger protein binding. Phys Chem Chem Phys 2022; 24:6605-6615. [PMID: 35234237 DOI: 10.1039/d2cp00082b] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Protein molecules are a good target for the inhibition or promotion of biological processes. Different methods like QSAR and molecular docking have been developed to accurately design small binder molecules for target proteins. An alternative model has been developed wherein a statistical method is used to find the propensity of different non-covalent interactions between small molecules and amino acid residues of the protein. The results give hints as to the choice of substituents required at the SM to strongly bind to a protein. In this case, 75 different types of proteins bound with coumarin derivatives have been investigated and the non-covalent interactions observed between the basic coumarin moiety and amino acids have been analyzed. Density functional theory (DFT) calculations were used to identify the electronic features of coumarin to understand the feasibility of the observed non-covalent interactions and to find appropriate groups that can modulate these interactions. The binding affinity towards a protein (β-lactoglobulin (BLG)) and the stability of the protein complex have been investigated through docking and molecular dynamics of 100 ns, respectively. The modeled compounds were synthesized and investigated with regards to their interactions with the model carrier protein. The thermodynamics of the interactions were also investigated and the binding is governed by the Le Chatelier principle.
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Affiliation(s)
- Nayim Sepay
- Department of Chemistry, Lady Brabourne College, Kolkata-700017, India.
| | - Manami Banerjee
- Department of Chemistry, Diamond Harbour Women's University, Sarisha-743368, India
| | - Rajibul Islam
- Department of Chemistry, Jadavpur University, Kolkata-700032, India
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18
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Bayraktar M. Molecular characterization of Kappa-casein and β-lactoglobulin genes in Anatolian Black cattle and Holstein breeds. ARQ BRAS MED VET ZOO 2022. [DOI: 10.1590/1678-4162-12497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ABSTRACT κ-Cn and β-lactoglobulin are important candidate genes associated with milk yield and milk protein content. The present investigation is carried out to determine the polymorphisms status of κ-Cn and β-lactoglobulin genes in Anatolian Black cattle and Holstein breeds. PCR-RFLP technique was used to determine Kappa-Casein and β-lactoglobulin polymorphisms in both cattle breeds. The allele frequency of Anatolian Black cattle in terms of κ-Cn and β-lactoglobulin genes were 0.50 (A) 0.50 (B) and 0.20 (A) 0.80 (B) respectively, whereas in Holstein were 0.29 (A) 0.71 (B) and 0.44 (A) 0.56 (B) respectively. The chi-square test showed that each cattle breed was in Hardy-Weinberg equilibrium (P>0.05).
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19
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Sagis LMC, Yang J. Protein-stabilized interfaces in multiphase food: comparing structure-function relations of plant-based and animal-based proteins. Curr Opin Food Sci 2022. [DOI: 10.1016/j.cofs.2021.11.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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20
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Binding analysis of the curcumin-based synthetic alpha-glucosidase inhibitors to beta-lactoglobulin as potential vehicle carrier for antidiabetic drugs. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2022. [DOI: 10.1007/s13738-021-02323-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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21
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Stobiecka M, Król J, Brodziak A. Antioxidant Activity of Milk and Dairy Products. Animals (Basel) 2022; 12:245. [PMID: 35158569 PMCID: PMC8833589 DOI: 10.3390/ani12030245] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/30/2021] [Accepted: 01/16/2022] [Indexed: 02/06/2023] Open
Abstract
The aim of the study was to present a review of literature data on the antioxidant potential of raw milk and dairy products (milk, fermented products, and cheese) and the possibility to modify its level at the milk production and processing stage. Based on the available reports, it can be concluded that the consumption of products that are a rich source of bioactive components improves the antioxidant status of the organism and reduces the risk of development of many civilization diseases. Milk and dairy products are undoubtedly rich sources of antioxidant compounds. Various methods, in particular, ABTS, FRAP, and DPPH assays, are used for the measurement of the overall antioxidant activity of milk and dairy products. Research indicates differences in the total antioxidant capacity of milk between animal species, which result from the differences in the chemical compositions of their milk. The content of antioxidant components in milk and the antioxidant potential can be modified through animal nutrition (e.g., supplementation of animal diets with various natural additives (herbal mixtures, waste from fruit and vegetable processing)). The antioxidant potential of dairy products is associated with the quality of the raw material as well as the bacterial cultures and natural plant additives used. Antioxidant peptides released during milk fermentation increase the antioxidant capacity of dairy products, and the use of probiotic strains contributes its enhancement. Investigations have shown that the antioxidant activity of dairy products can be enhanced by the addition of plant raw materials or their extracts in the production process. Natural plant additives should therefore be widely used in animal nutrition or as functional additives to dairy products.
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Affiliation(s)
| | - Jolanta Król
- Department of Quality Assessment and Processing of Animal Products, Faculty of Animal Sciences and Bioeconomy, University of Life Sciences in Lublin, Akademicka 13, 20-950 Lublin, Poland; (M.S.); (A.B.)
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22
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Fenner K, Redgate A, Brancaleon L. A 200 nanoseconds all-atom simulation of the pH-dependent EF loop transition in bovine β-lactoglobulin. The role of the orientation of the E89 side chain. J Biomol Struct Dyn 2022; 40:549-564. [PMID: 32909899 PMCID: PMC8853732 DOI: 10.1080/07391102.2020.1817785] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In silico molecular dynamics (MD) using crystallographic and NMR data was used to simulate the effects of the protonation state of E89 on the pH-dependent conformational rearrangement of the EF loop, also known as the Tanford transition, in a series of apo-β-lactoglobulin (BLG) structures. Compared to existing studies these simulations were carried out over a much longer time scale (200 ns where the stability of the transition can be evaluated) and used an explicit water model. We considered eight different entries from the Brookhaven Protein Data Bank (PDB) separated into two groups. We observed that fixing the protonation state of E89 prompts the transition of the EF loop only when its side chain is oriented under the loop and into the entrance of the interior cavity. The motion of the EF loop occurs mostly as a step-function and its timing varies greatly from ∼ 20 ns to ∼170 ns from the beginning of the simulation. Once the transition is completed, the protein appears to reach a stable conformation as in a true two-state transition. We also observed novel findings. When the transition occurs, the hydrogen bond between E89 and S116 is replaced with a salt bridge with Lys residues in the βC-CD loop-βD motif. This electrostatic interaction causes the distortion of this motif as well as the protrusion of the GH loop into the aperture of the cavity with the result of limiting the increase of its contour area despite the rotation of the EF loop.Communicated by Ramaswamy H. Sarma.
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23
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Huang Y, Zhang X, Suo H. Interaction between β-lactoglobulin and EGCG under high-pressure by molecular dynamics simulation. PLoS One 2021; 16:e0255866. [PMID: 34932559 PMCID: PMC8691620 DOI: 10.1371/journal.pone.0255866] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 11/29/2021] [Indexed: 11/19/2022] Open
Abstract
The binding between β-lactoglobulin and epigallocatechin gallate (EGCG) under the pressure of 600 MPa was explored using molecular docking and molecular dynamics (MD) simulation. EGCG bound mainly in two regions with site 1 in internal cavity of the β-barrel and site 2 on the surface of protein. 150 ns MD was performed starting from the structure with the optimal binding energy at the two sites in molecular docking, respectively. It was found that the protein fluctuated greatly when small molecule bound to site 2 at 0.1 MPa, and the protein fluctuation and solvent accessible surface area became smaller under high-pressure. The binding of small molecules made the protein structure more stable with increasing of α-helix and β-sheet, while high-pressure destroyed α-helix of protein. The binding energy of small molecules at site 1was stronger than that at site 2 under 0.1 MPa, with stronger van der Waals and hydrophobic interaction at site 1 while more hydrogen bonds were present at site 2. The binding energy of both sites weakened under high-pressure, especially at site 1, causing the binding force to be weaker at site 1 than that at site 2 under high-pressure.
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Affiliation(s)
- Yechuan Huang
- College of Bioengineering, Jingchu University of Technology, Jingmen, PR China
- * E-mail: ,
| | - Xicai Zhang
- College of Bioengineering, Jingchu University of Technology, Jingmen, PR China
| | - Huayi Suo
- College of Food Science, Southwest University, Chongqing, PR China
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24
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Interactions of β-Lactoglobulin with Bovine Submaxillary Mucin vs. Porcine Gastric Mucin: The Role of Hydrophobic and Hydrophilic Residues as Studied by Fluorescence Spectroscopy. Molecules 2021; 26:molecules26226799. [PMID: 34833889 PMCID: PMC8623809 DOI: 10.3390/molecules26226799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 11/02/2021] [Accepted: 11/08/2021] [Indexed: 11/17/2022] Open
Abstract
The aim of this study was to investigate binding interactions between β-lactoglobulin (BLG) and two different mucins, bovine submaxillary mucins (BSM) and porcine gastric mucin (PGM), using intrinsic and extrinsic fluorescence spectroscopies. Intrinsic fluorescence spectra showed an enhanced decrease of fluorescence intensity of BLG at all pH conditions when BLG was mixed with PGM rather than with BSM. We propose that, unlike BSM, the tertiary structure of PGM changes and the hydrophobic regions are exposed at pH 3 due to protonation of negatively charged residues. Results suggest that PGM also facilitated the structural unfolding of BLG and its binding with PGM by a hydrophobic interaction, especially at acidic pH, which was further supported by extrinsic fluorescence spectroscopy. Hydrophobic interaction is suggested as the dominant interaction mechanism between BLG and PGM at pH 3, whereas electrostatic interaction is the dominant one between BLG and BSM.
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25
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Eichinger A, Neumaier I, Skerra A. The extracellular region of bovine milk butyrophilin exhibits closer structural similarity to human myelin oligodendrocyte glycoprotein than to immunological BTN family receptors. Biol Chem 2021; 402:1187-1202. [PMID: 34342946 DOI: 10.1515/hsz-2021-0122] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Accepted: 06/17/2021] [Indexed: 11/15/2022]
Abstract
Bovine butyrophilin (BTN1A1) is an abundant type I transmembrane glycoprotein exposed on the surface of milk fat globules. We have solved the crystal structure of its extracellular region via multiple wavelength anomalous dispersion after incorporation of selenomethionine into the bacterially produced protein. The butyrophilin ectodomain exhibits two subdomains with immunoglobulin fold, each comprising a β-sandwich with a central disulfide bridge as well as one N-linked glycosylation. The fifth Cys residue at position 193 is unpaired and prone to forming disulfide crosslinks. The apparent lack of a ligand-binding site or receptor activity suggests a function predominantly as hydrophilic coat protein to prevent coagulation of the milk fat droplets. While there is less structural resemblance to members of the human butyrophilin family such as BTN3A, which play a role as immune receptors, the N-terminal bovine butyrophilin subdomain shows surprising similarity to the human myelin oligodendrocyte glycoprotein, a protein exposed on the surface of myelin sheaths. Thus, our study lends structural support to earlier hypotheses of a correlation between the consumption of cow milk and prevalence of neurological autoimmune diseases and may offer guidance for the breeding of cattle strains that express modified butyrophilin showing less immunological cross-reactivity.
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Affiliation(s)
- Andreas Eichinger
- Lehrstuhl für Biologische Chemie, Technische Universität München, Emil-Erlenmeyer-Forum 5, D-85354 Freising, Germany
| | - Irmgard Neumaier
- Lehrstuhl für Biologische Chemie, Technische Universität München, Emil-Erlenmeyer-Forum 5, D-85354 Freising, Germany
| | - Arne Skerra
- Lehrstuhl für Biologische Chemie, Technische Universität München, Emil-Erlenmeyer-Forum 5, D-85354 Freising, Germany
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26
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Chruszcz M, Chew FT, Hoffmann‐Sommergruber K, Hurlburt BK, Mueller GA, Pomés A, Rouvinen J, Villalba M, Wöhrl BM, Breiteneder H. Allergens and their associated small molecule ligands-their dual role in sensitization. Allergy 2021; 76:2367-2382. [PMID: 33866585 PMCID: PMC8286345 DOI: 10.1111/all.14861] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 04/07/2021] [Accepted: 04/10/2021] [Indexed: 02/06/2023]
Abstract
Many allergens feature hydrophobic cavities that allow the binding of primarily hydrophobic small‐molecule ligands. Ligand‐binding specificities can be strict or promiscuous. Serum albumins from mammals and birds can assume multiple conformations that facilitate the binding of a broad spectrum of compounds. Pollen and plant food allergens of the family 10 of pathogenesis‐related proteins bind a variety of small molecules such as glycosylated flavonoid derivatives, flavonoids, cytokinins, and steroids in vitro. However, their natural ligand binding was reported to be highly specific. Insect and mammalian lipocalins transport odorants, pheromones, catecholamines, and fatty acids with a similar level of specificity, while the food allergen β‐lactoglobulin from cow's milk is notably more promiscuous. Non‐specific lipid transfer proteins from pollen and plant foods bind a wide variety of lipids, from phospholipids to fatty acids, as well as sterols and prostaglandin B2, aided by the high plasticity and flexibility displayed by their lipid‐binding cavities. Ligands increase the stability of allergens to thermal and/or proteolytic degradation. They can also act as immunomodulatory agents that favor a Th2 polarization. In summary, ligand‐binding allergens expose the immune system to a variety of biologically active compounds whose impact on the sensitization process has not been well studied thus far.
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Affiliation(s)
- Maksymilian Chruszcz
- Department of Chemistry and Biochemistry University of South Carolina Columbia SC USA
| | - Fook Tim Chew
- Department of Biological Sciences National University of Singapore Singapore
| | - Karin Hoffmann‐Sommergruber
- Division of Medical Biotechnology Department of Pathophysiology and Allergy Research Medical University of Vienna Vienna Austria
| | - Barry K. Hurlburt
- Agricultural Research Service Southern Regional Research Center US Department of Agriculture New Orleans LA USA
| | - Geoffrey A. Mueller
- National Institute of Environmental Health Sciences National Institutes of Health Research Triangle Park NC USA
| | - Anna Pomés
- Indoor Biotechnologies, Inc. Charlottesville VA USA
| | - Juha Rouvinen
- Department of Chemistry University of Eastern Finland Joensuu Finland
| | - Mayte Villalba
- Department of Biochemistry and Molecular Biology Universidad Complutense de Madrid Madrid Spain
| | | | - Heimo Breiteneder
- Division of Medical Biotechnology Department of Pathophysiology and Allergy Research Medical University of Vienna Vienna Austria
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27
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Fei S, Zhou J, Wu Y, Tong P, Gao J, Chen H, Li X. Change in conformational, digestive and immunological characteristics of bovine allergen β-lactoglobulin induced by metal ions in combination with heating. Food Chem 2021; 364:130030. [PMID: 34198035 DOI: 10.1016/j.foodchem.2021.130030] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 05/05/2021] [Accepted: 05/06/2021] [Indexed: 10/21/2022]
Abstract
Aggregation of bovine β-lactoglobulin is affected easily by external factors. In this study, effects of metal ions combining with temperature on aggregation of β-lactoglobulin were explored. The conformational characteristics of aggregates were detected by environment scanning electron microscope, CD spectrum and free sulfhydryl group, respectively. Digestive and immunological characteristics were assessed by simulated digestion in vitro and ELISA respectively. The results showed that the morphology of β-lactoglobulin aggregates became more amorphous in Cu2+ and Mg2+ treated samples and more constricted in Zu2+-induced protein. Among them, Cu2+ altered the secondary structure of β-lactoglobulin aggregates and free sulfhydryl content most as well as that in gastric digestion. However, all ion-treated groups had similar digestive stability in intestinal digestion. Specially, Ca2+ and Mg2+ made the antigenicity and potential allergenicity of β-lactoglobulin aggregates decrease, which helps us understand the role of metal ions in immunological characteristics.
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Affiliation(s)
- Shuangwen Fei
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China; School of Food Science and Technology, Nanchang University, Nanchang 330047, PR China
| | - Jianwen Zhou
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China; School of Food Science and Technology, Nanchang University, Nanchang 330047, PR China
| | - Yong Wu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China; School of Food Science and Technology, Nanchang University, Nanchang 330047, PR China
| | - Ping Tong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China
| | - Jingyan Gao
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China; School of Food Science and Technology, Nanchang University, Nanchang 330047, PR China
| | - Hongbing Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China; Sino-German Joint Research Institute, Nanchang University, Nanchang 330047, PR China
| | - Xin Li
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, PR China; School of Food Science and Technology, Nanchang University, Nanchang 330047, PR China.
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28
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Kieserling H, Pankow A, Keppler JK, Wagemans AM, Drusch S. Conformational state and charge determine the interfacial film formation and film stability of β-lactoglobulin. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106561] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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29
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Feng Y, Liu W, Mercadé-Prieto R, Chen XD. Dye-protein interactions between Rhodamine B and whey proteins that affect the photoproperties of the dye. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2020.113092] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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30
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Bodiga VL, Kudle MR, Vemuri PK, Bodiga S. Crocin inhibits urea-induced amyloid formation by bovine β-lactoglobulin. NEW J CHEM 2021. [DOI: 10.1039/d0nj02335c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Crocin stabilizes the native structure of β-lactoglobulin and attenuates urea-induced unfolding and loss of β-sheet structure during amyloidogenesis.
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Affiliation(s)
- Vijaya Lakshmi Bodiga
- Department of Biochemistry and Molecular Biology
- Institute of Genetics & Hospital for Genetic Diseases
- Begumpet
- Osmania University
- Hyderabad
| | | | | | - Sreedhar Bodiga
- Department of Basic and Social Sciences
- Forest College and Research Institute
- Mulugu
- Siddipet
- India
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31
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Park C, Jimenez-Flores R, Maleky F. Quantifications of Oleocolloid Matrices Made of Whey Protein and Oleogels. Foods 2020; 9:foods9111697. [PMID: 33228228 PMCID: PMC7699611 DOI: 10.3390/foods9111697] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 11/09/2020] [Accepted: 11/12/2020] [Indexed: 11/21/2022] Open
Abstract
Consumer demand for high protein content and plant-based fat has necessitated novel approaches to healthy food products. In response to this need, oleogels (OG) (structured liquid oils) emerged as a possible means of not only replacing saturated and trans fats but also delivering food protein. Nevertheless, an in-depth view of the structure of networks made of OG and protein is deficient. Hence, the objective of this study is developing oleocolloid (OC) (whey protein and rice bran wax OG) and hydro-oleocolloid (HOC) (OC + water) matrices with varying protein content (2.5–7.5%) to characterize their structural properties. Thermal analysis of the matrices via differential scanning calorimetry (DSC) documented the effects of hydrophobic interactions on the protein structure and its stability. Whey protein denaturation temperature increased from 74.9 °C to 102.8 °C in the presence of high oleic soybean oil. The effects of vegetable oil on WPI structure was also verified by FTIR spectroscopy. Data analysis revealed slight structural changes of the WPI secondary structure in the hydrophobic oil medium and the α-helix and β-sheet proportion in the emulsion medium was significantly altered. Similar analysis was performed in OC and HOC networks to quantify possible interactions between protein and rice bran wax. Results indicated that the protein was denatured during the thermal and mechanical conditions required for the oleogelation process, while it did not affect the systems’ solid fat content (SFC) and polymorphic patterns of the oleogels. However, DSC analysis showed different onset of melting for OC and HOC samples due to colloidal interactions between the protein and the lipid phase. The role of these chemistry was confirmed by microscopy analyses where OC and HOC matrices displayed notably different microstructural properties. The observed differences in the structural properties between OC and HOC matrices indicate the different colloidal interactions mediated by oleogelation process and the liquid medium type (oil vs. emulsion).
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Affiliation(s)
- Clifford Park
- Department of Food Science and Technology, The Ohio State University, 2015 Fyffe Ct., Columbus, OH 43210, USA
| | - Rafael Jimenez-Flores
- Department of Food Science and Technology, The Ohio State University, 2015 Fyffe Ct., Columbus, OH 43210, USA
| | - Farnaz Maleky
- Department of Food Science and Technology, The Ohio State University, 2015 Fyffe Ct., Columbus, OH 43210, USA
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32
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Bello M. Structural mechanism of the Tanford transition of bovine β-lactoglobulin through microsecond molecular dynamics simulations. J Biomol Struct Dyn 2020; 40:3011-3023. [PMID: 33155532 DOI: 10.1080/07391102.2020.1844062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
X-ray analysis has provided structural data about a pH-driven conformational change in β-lactoglobulin (BLG) known as the Tanford transition, which occurs at around pH 7 and involves the EF loop, which acts as a lid closing the internal cavity of the protein below pH 7 and opening it above pH 7. NMR studies using wild-type BLG have encountered problems trying to explain the Tanford transition, however, they have provided important insight using a dimeric BLG mutant, revealing that the opening and closure of the EF loop consists of two types of motions in the microsecond and milliseconds timescales. This provides valuable information indicating that the dimeric state is a good model to study the Tanford transition, although the understanding of this structural change is still lacking at the atomic level. We performed microsecond molecular dynamics (MD) simulations starting from different conformations of BLG in the monomeric and dimeric state, with protonated and deprotonated E89, in order to explore the Tanford transition. Our results provide structural information for the transition from the closed to the open conformation in BLG and show it occurs in the dimeric state in the microsecond timescale, in line with the fast motion observed through NMR experiments. In addition, MD simulations coupled to MMGBSA approach indicated that the most populated conformer of BLG in the open state is able to bind ligands with similar affinity to that of BLG at neutral pH obtained through crystallographic experiments.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Martiniano Bello
- Laboratorio de Modelado Molecular, Bioinformática y Diseño de Fármacos de la Escuela Superior de Medicina, Instituto Politécnico Nacional, Mexico City, Mexico
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33
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Kurz F, Hengst C, Kulozik U. RP-HPLC method for simultaneous quantification of free and total thiol groups in native and heat aggregated whey proteins. MethodsX 2020; 7:101112. [PMID: 33194562 PMCID: PMC7644750 DOI: 10.1016/j.mex.2020.101112] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 10/14/2020] [Indexed: 11/27/2022] Open
Abstract
Disulfide formation of whey proteins during heat treatment via thiol oxidation is important with regard to techno-functional properties. Due to the formation of other oxidation products than disulfides, the decrease in free thiol concentration is not proportional to the disulfide formation. Thus, in order to evaluate thiol reactivity and disulfide concentration both parameters are required. Currently applied methods focus mainly on the loss of free thiols using the spectrophotometric Ellman's assay. Next to that, we improved an existing RP-HPLC assay using the thiol reagent 4,4′-Dithiodipyridine (DTDP) to quantify free thiols as well as total (free thiols and disulfide bonds) thiols of native and heat-treated whey proteins. Thereby, the sample preparation technique, the sample handling, and the analysis technique were optimized. Thus, the paper provides a simple RP-HPLC method for quantification of thiol oxidation reactions to determine heat-induced changes in the structure of whey proteins. In addition, the method should be applicable to other protein systems due to the method validation by proteins of different amounts of free and total thiols in their structure.Simple RP-HPLC method for quantification of free and total thiols using 4,4′-Dithiodipyridine (DTDP). High recovery rates for free and total thiols. High stability within 24 h.
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Affiliation(s)
- Franziska Kurz
- Chair of Food and Bioprocess Engineering, Technical University of Munich, Freising, Germany
| | - Claudia Hengst
- Chair of Food and Bioprocess Engineering, Technical University of Munich, Freising, Germany
| | - Ulrich Kulozik
- Chair of Food and Bioprocess Engineering, Technical University of Munich, Freising, Germany
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Baruah I, Borgohain G. Structural and functional changes of the protein β-lactoglobulin under thermal and electrical processing conditions. Biophys Chem 2020; 267:106479. [PMID: 33027745 DOI: 10.1016/j.bpc.2020.106479] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 09/15/2020] [Accepted: 09/15/2020] [Indexed: 10/23/2022]
Abstract
In the present study we have tried to explore the effect of static external electric field of strength 3.0 V/nm on the conformational changes adopted by the protein β-lactoglobulin. We have chosen different temperatures viz. 300 K, 400 K and 450 K to evaluate the temperature dependent effect of electric field. We have observed that combined effect of high temperature and static external electric field show significant changes on the structural conformation of the protein which in turn may affect the functional properties of the protein. Calculations of root mean square deviations reveal that both helical and β-sheet regions of the protein are noticeably affected at high temperature. We have used solvent accessible surface area (SASA) and dipole moment values to explain that there is changes in hydrophobicity of the protein surface due to presence of external electric field. The study reveals that electric field in combination with high temperature can be used to alter the conformation of the protein and the effect of external electric field is more pronounced at high temperature than that of low temperature. The study provides a better understanding of the conformational changes adopted by the protein under the stress of external electric field and high temperature and provide guidance to choose optimum conditions for processing without loss of nutritional properties.
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Affiliation(s)
- Indrani Baruah
- Department of Chemistry, Cotton University, Guwahati, Assam 781001, India
| | - Gargi Borgohain
- Department of Chemistry, Cotton University, Guwahati, Assam 781001, India.
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35
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Niu B, Chao C, Cai J, Yan Y, Copeland L, Yu J, Wang S, Wang S. Effect of pH on formation of starch complexes with lauric acid and β-lactoglobulin. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.109915] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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36
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Habeler M, Lindner HH, Redl B. A role of heparan sulphate proteoglycan in the cellular uptake of lipocalins ß-lactoglobulin and allergen Fel d 4. Biol Chem 2020; 401:1081-1092. [PMID: 32229688 DOI: 10.1515/hsz-2020-0132] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 03/16/2020] [Indexed: 01/22/2023]
Abstract
Lipocalins, small extracellular hydrophobic molecule carriers, can be internalized by a variety of different cells. However, to date receptors have only been identified for human lipocalins. Here, we specifically investigated uptake mechanisms for lipocalins ß-lactoglobulin and Fel d 4 in HeLa and Chinese hamster ovary (CHO) cells. We provide evidence that cell surface heparan sulphate proteoglycan is essential for internalization of these lipocalins. In HeLa cells, lipocalin uptake was inhibited by competition with soluble heparin, enzymatic digestion of cellular heparan sulphate by heparinase and inhibition of its biosynthesis by sodium chlorate. Biochemical studies by heparin affinity chromatography and colocalization studies further supported a role of heparan sulphate proteoglycan in lipocalin uptake. Finally, lipocalin uptake was blocked in CHO mutant cells defective in glycosaminoglycan biosynthesis whereas in wild-type cells it was clearly detectable. Thus, cell surface heparan sulphate proteoglycan represents a novel component absolutely participating in the cellular uptake of some lipocalins.
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Affiliation(s)
- Matthias Habeler
- Institute of Molecular Biology, Medical University Innsbruck, Innrain 80, A-6020, Innsbruck, Austria
| | - Herbert H Lindner
- Institute of Clinical Biochemistry, Medical University Innsbruck, Innrain 80, A-6020, Innsbruck, Austria
| | - Bernhard Redl
- Institute of Molecular Biology, Medical University Innsbruck, Innrain 80, A-6020, Innsbruck, Austria
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37
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Changes in the molecular structure and stability of β-lactoglobulin induced by heating with sugar beet pectin in the dry-state. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2020.105809] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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de Morais FP, Pessato TB, Rodrigues E, Peixoto Mallmann L, Mariutti LR, Netto FM. Whey protein and phenolic compound complexation: Effects on antioxidant capacity before and after in vitro digestion. Food Res Int 2020; 133:109104. [DOI: 10.1016/j.foodres.2020.109104] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 02/11/2020] [Accepted: 02/15/2020] [Indexed: 01/30/2023]
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39
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Effects of biscuit fortified with whey protein isolate and wheat bran on weight loss, energy intake, appetite score, and appetite regulating hormones among overweight or obese adults. J Funct Foods 2020. [DOI: 10.1016/j.jff.2019.103743] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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40
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Møller AH, Wijaya W, Jahangiri A, Madsen B, Joernsgaard B, Vaerbak S, Hammershøj M, Van der Meeren P, Dalsgaard TK. Norbixin binding to whey protein isolate - alginate electrostatic complexes increases its solubility and stability. Food Hydrocoll 2020. [DOI: 10.1016/j.foodhyd.2019.105559] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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41
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Brink LR, Herren AW, McMillen S, Fraser K, Agnew M, Roy N, Lönnerdal B. Omics analysis reveals variations among commercial sources of bovine milk fat globule membrane. J Dairy Sci 2020; 103:3002-3016. [DOI: 10.3168/jds.2019-17179] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 12/01/2019] [Indexed: 11/19/2022]
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42
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Cortes-Hernandez P, Vázquez Nuñez R, Domínguez-Ramírez L. Docking and Molecular Dynamics Predictions of Pesticide Binding to the Calyx of Bovine β-Lactoglobulin. Int J Mol Sci 2020; 21:ijms21061988. [PMID: 32183317 PMCID: PMC7139891 DOI: 10.3390/ijms21061988] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 03/01/2020] [Accepted: 03/02/2020] [Indexed: 11/16/2022] Open
Abstract
Pesticides are used extensively in agriculture, and their residues in food must be monitored to prevent toxicity. The most abundant protein in cow’s milk, β-lactoglobulin (BLG), shows high affinity for diverse hydrophobic ligands in its central binding pocket, called the calyx. Several of the most frequently used pesticides are hydrophobic. To predict if BLG may be an unintended carrier for pesticides, we tested its ability to bind 555 pesticides and their isomers, for a total of 889 compounds, in a rigid docking screen. We focused on the analysis of 60 unique molecules belonging to the five pesticide classes defined by the World Health Organization, that docked into BLG’s calyx with ΔGs ranging from −8.2 to −12 kcal mol−1, chosen by statistical criteria. These “potential ligands” were further analyzed using molecular dynamic simulations, and the binding energies were explored with Molecular Mechanics/Generalized Born/Surface Area (MMGBSA). Hydrophobic pyrethroid insecticides, like cypermethrin, were found to bind as deeply and tightly into the calyx as BLG’s natural ligand, palmitate; while polar compounds, like paraquat, were expelled. Our results suggest that BLG could be a carrier for pesticides, in particular for pyrethroid insecticides, allowing for their accumulation in cow’s milk beyond their solubility restrictions. This analysis opens possibilities for pesticide biosensor design based on BLG.
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Affiliation(s)
- Paulina Cortes-Hernandez
- Instituto Mexicano del Seguro Social (IMSS), Centro de Investigación Biomédica de Oriente (CIBIOR), Cellular Biology Laboratory, 74360 Metepec, Puebla, Mexico;
| | - Roberto Vázquez Nuñez
- Department of Fundamental Microbiology, University of Lausanne, CH-1015 Lausanne, Switzerland;
| | - Lenin Domínguez-Ramírez
- Department of Chemical and Biological Sciences, School of Sciences, Universidad de las Américas Puebla, Santa Catarina Mártir Cholula, 72810 San Andrés Cholula, Puebla, Mexico
- Correspondence:
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43
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Effects of Fluorolink® S10 surface coating on WPC fouling of stainless steel surfaces and subsequent cleaning. FOOD AND BIOPRODUCTS PROCESSING 2019. [DOI: 10.1016/j.fbp.2019.09.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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44
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Yeates TO, McPherson A. The structure of bovine β-lactoglobulin in crystals grown at pH 3.8 exhibiting novel threefold twinning. Acta Crystallogr F Struct Biol Commun 2019; 75:640-645. [PMID: 31584012 PMCID: PMC6777136 DOI: 10.1107/s2053230x1901224x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 09/03/2019] [Indexed: 11/10/2022] Open
Abstract
Bovine β-lactoglobulin was crystallized from 3 M NaCl buffered at pH 3.8 with sodium citrate as thick hexagonal prisms of greater than 1 mm in edge length. Analyses of the X-ray diffraction intensities using three different current algorithms were unanimous in specifying the space group to be P6322, with unit-cell dimensions a = b = 75.47, c = 140.79 Å. No progress could be made, however, towards an acceptable solution by molecular replacement using this symmetry. In the end, it was found that the true space group was C2221, a subgroup of P6322, with a = 65.89, b = 114.12, c = 140.51 Å, with the apparent 622 symmetry arising from an unusual threefold or tritohedral twinning. An assembly based on a model of the protein in another crystal form (PDB entry 1beb) containing three molecules in the asymmetric unit was refined to 2.3 Å resolution with a final R factor of 0.23 and Rfree of 0.26. NCS restraints were maintained throughout. For the most part, the molecules found in this crystal form are virtually the same as in PDB entry 1beb, although there are numerous local variations, particularly in loop elements, rotamer conformation differences and some alterations, including additions, at the termini.
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Affiliation(s)
- Todd O. Yeates
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA
| | - Alexander McPherson
- Department of Molecular Biology and Biochemistry, University of California, Irvine, CA 92697-3900, USA
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45
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Torres PB, Quiroga E, Ramirez-Pastor AJ, Boeris V, Narambuena CF. Interaction between β-Lactoglobuline and Weak Polyelectrolyte Chains: A Study Using Monte Carlo Simulation. J Phys Chem B 2019; 123:8617-8627. [DOI: 10.1021/acs.jpcb.9b03276] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Paola B. Torres
- Facultad Regional San Rafael, Universidad Tecnológica Nacional, San Rafael 5600, Argentina
| | - Evelina Quiroga
- Instituto de Física Aplicada (INFAP), Universidad Nacional de San Luis-CONICET, San Luis 5700, Argentina
| | - Antonio J. Ramirez-Pastor
- Instituto de Física Aplicada (INFAP), Universidad Nacional de San Luis-CONICET, San Luis 5700, Argentina
| | - Valeria Boeris
- Facultad de Ciencias Bioquímicas y Farmacéuticas, Área Fisicoquímica, Universidad Nacional de Rosario, Rosario 2000, Argentina
| | - Claudio F. Narambuena
- Facultad Regional San Rafael, Universidad Tecnológica Nacional, San Rafael 5600, Argentina
- Instituto de Física Aplicada (INFAP), Universidad Nacional de San Luis-CONICET, San Luis 5700, Argentina
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46
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Iwaoka M, Mitsuji T, Shinozaki R. Oxidative folding pathways of bovine milk β-lactoglobulin with odd cysteine residues. FEBS Open Bio 2019; 9:1379-1391. [PMID: 31087497 PMCID: PMC6668375 DOI: 10.1002/2211-5463.12656] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 05/13/2019] [Indexed: 01/06/2023] Open
Abstract
Bovine β‐lactoglobulin (BLG) is a major whey protein with unique structural characteristics: it possesses a free Cys thiol (SH) and two disulfide (SS) bonds and consists of a β‐barrel core surrounded by one long and several short α helices. Although SS‐intact conformational folding has been studied in depth, the oxidative folding pathways and accompanying SS formation/rearrangement are poorly understood. In this study, we used trans‐3,4‐dihydroxyselenolane oxide, a water‐soluble selenoxide reagent which undergoes rapid and quantitative SS formation, to determine the oxidative folding pathways of BLG variant A (BLGA) at pH 8.0 and 25 °C. This was done by characterizing two key one‐SS intermediates, a particular folding intermediate having a Cys66–Cys160 SS bond (I‐1) and a particular folding intermediate having a Cys106–Cys119 SS bond (I‐2), which have a native Cys66–Cys160 and Cys106–Cys119 SS bond, respectively. In the major folding pathway, the reduced protein (R) with abundant α helices was oxidized to I‐1, which was then transformed to I‐2 through SS rearrangement. The native protein (N) was formed by oxidation of I‐2. The redundant Cys121 thiol facilitates SS rearrangement. N is also generated from an ensemble of folding intermediates having two SS bonds (2SS) intermediates with scrambled SS bonds through SS rearrangement, but this minor pathway is deteriorative due to aggregation or overoxidation of 2SS. During oxidative folding of BLGA, α→β conformational transition occurred as previously observed in SS‐intact folding. These findings are informative not only for elucidating oxidative folding pathways of other members of the β‐lactoglobulin family, but also for understanding the roles of a redundant Cys thiol in the oxidative folding process of a protein with odd Cys residues.
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Affiliation(s)
- Michio Iwaoka
- Department of Chemistry, School of Science, Tokai University, Hiratsuka-shi, Kanagawa, Japan
| | - Takumi Mitsuji
- Department of Chemistry, School of Science, Tokai University, Hiratsuka-shi, Kanagawa, Japan
| | - Reina Shinozaki
- Department of Chemistry, School of Science, Tokai University, Hiratsuka-shi, Kanagawa, Japan
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47
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Characteristic of interaction mechanism between β-lactoglobulin and nobiletin: A multi-spectroscopic, thermodynamics methods and docking study. Food Res Int 2019; 120:255-263. [DOI: 10.1016/j.foodres.2019.01.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 01/03/2019] [Accepted: 01/04/2019] [Indexed: 12/11/2022]
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48
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Qi PX, Chau HK, Hotchkiss AT. Molecular characterization of interacting complexes and conjugates induced by the dry-state heating of β-lactoglobulin and sugar beet pectin. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2019.01.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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49
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Swiatek S, Komorek P, Jachimska B. Adsorption of β-lactoglobulin A on gold surface determined in situ by QCM-D measurements. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2019.01.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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50
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Bogahawaththa D, Chandrapala J, Vasiljevic T. Thermal denaturation of bovine β-lactoglobulin in different protein mixtures in relation to antigenicity. Int Dairy J 2019. [DOI: 10.1016/j.idairyj.2018.10.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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