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Okagu OD, Abioye RO, Udenigwe CC. Molecular Interaction of Pea Glutelin and Lipophilic Bioactive Compounds: Structure-Binding Relationship and Nano-/Microcomplexation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:4957-4969. [PMID: 36939737 DOI: 10.1021/acs.jafc.3c00047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
This study investigated the impact of ionic strength and lipophilicity of bioactive compounds on their interaction with the alkaline soluble pea glutelin fraction (ASF) using the fluorescence quenching technique. A Stern-Volmer quenching constant, KD, of 8.9 ± 0.10, 5.3 ± 0.06, 4.0 ± 0.01, 1.1 ± 0.00, 0.9 ± 0.02, and 0.1 ± 0.00 (×104 M-1) was observed for curcumin-ASF (CuASF), astaxanthin-ASF (AsASF), cholecalciferol-ASF (ChASF), β-carotene-ASF (βCaASF), coenzyme Q10-ASF (Q10ASF), and β-sitosterol-ASF (βSiASF) complexes, respectively. An increase in ionic strength did not significantly change KD, the effective quenching constant K, and the bimolecular quenching rate constant KQ. However, it changed the mode of interaction of the ASF with cholecalciferol, β-carotene, coenzyme Q10, and β-sitosterol from static to static-dynamic quenching. Transmission electron microscopy showed that the morphology formed with protein (spherical nanocomplexes, microaggregates, or fiber-like particles) differed among the compounds. The favorable binding of CuASF, AsASF, ChASF, and βCaASF complexes provides stable matrices for formulating protein-based delivery systems for lipophilic nutraceuticals.
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Affiliation(s)
- Ogadimma D Okagu
- Department of Chemistry and Biomolecular Sciences, Faculty of Science, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Raliat O Abioye
- Department of Chemistry and Biomolecular Sciences, Faculty of Science, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Chibuike C Udenigwe
- Department of Chemistry and Biomolecular Sciences, Faculty of Science, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
- School of Nutrition Sciences, Faculty of Health Sciences, University of Ottawa, Ottawa, Ontario K1H 8M5, Canada
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Lin D, Su J, Chen S, Wei J, Zhang L, Li X, Yuan F. Formation mechanism of binary complex based on β-lactoglobulin and propylene glycol alginate with different molecular weights: Structural characterization and delivery of curcumin. Front Nutr 2022; 9:965600. [PMID: 35928836 PMCID: PMC9344013 DOI: 10.3389/fnut.2022.965600] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 06/28/2022] [Indexed: 11/13/2022] Open
Abstract
The complexation of protein and polysaccharide has shown considerable potential for the encapsulation of functional food components. In this work, propylene glycol alginate (PGA) molecules with different molecular weights (100, 500, and 2,000 kDa) were prepared through H2O2 oxidation, which were further combined with β-lactoglobulin nanoparticles (β-lgNPs) to form PGA-β-lgNPs complexes for the delivery of curcumin (Cur). Results showed that the depolymerization of PGA molecule was resulted from the breakage of glycosidic bonds in the main chain, and the depolymerization rate of PGA molecule depended on the reaction time, temperature, solution pH and H2O2 concentration. As the increasing molecular weight of PGA, the particle size, zeta-potential and turbidity of the complexes were obviously increased. The formation of PGA/β-lgNPs complexes was mainly driven by non-covalent interaction, including electrostatic gravitational interaction, hydrogen bonding and hydrophobic effect. Interestingly, the difference in the molecular weight of PGA also led to significantly differences in the micro-morphology of the complexes, as PGA with a high molecular weight (2,000 kDa) generated the formation of a “fruit-tree” shaped structure, whereas PGA with relatively low molecular weight (100 and 500 kDa) led to spherical particles with a “core-shell” structure. In addition, the incorporation of PGA molecules into β-lgNPs dispersion also contributed to the improvement in the encapsulation efficiency of Cur as well as physicochemical stability of β-lgNPs, and PGA with a higher molecular weight was confirmed with a better effect. Findings in the current work may help to further understand the effect of molecular weight of polysaccharide on the physical and structural properties as well as effectiveness as delivery systems of polysaccharide-protein complexes, providing for the possibility for the design and development of more efficient carriers for bioactive compounds in food system.
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Affiliation(s)
- Dongdong Lin
- School of Physical Science and Technology, Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo, China
- *Correspondence: Dongdong Lin,
| | - Jiaqi Su
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- Particle and Interfacial Technology Group, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Shuai Chen
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
- School of Public Health, Wuhan University, Wuhan, China
| | - Jiao Wei
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Liang Zhang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Xiude Li
- School of Food and Health, Beijing Technology and Business University, Beijing, China
| | - Fang Yuan
- Particle and Interfacial Technology Group, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
- Fang Yuan,
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Bagheri F, Fatemi MH. Investigation of the Interaction between Nilotinib and Alpha-Lactalbumin by Spectroscopic Methods and Docking Studies. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2022. [DOI: 10.1134/s1068162022040057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Zhang S, Li X, Zheng L, Zheng X, Yang Y, Xiao D, Ai B, Sheng Z. Encapsulation of phenolics in β-lactoglobulin: Stability, antioxidant activity, and inhibition of advanced glycation end products. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113437] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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5
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Bielecka M, Cichosz G, Czeczot H. Antioxidant, antimicrobial and anticarcinogenic activities of bovine milk proteins and their hydrolysates - A review. Int Dairy J 2022. [DOI: 10.1016/j.idairyj.2021.105208] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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6
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Bagheri F, Fatemi MH. Investigation of the Interaction of Sorafenib with Alpha-Lactalbumin: Spectroscopic and Molecular Modeling. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1068162021040038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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7
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Milea ȘA, Aprodu I, Mihalcea L, Enachi E, Bolea CA, Râpeanu G, Bahrim GE, Stănciuc N. Bovine β-lactoglobulin peptides as novel carriers for flavonoids extracted with supercritical fluids from yellow onion skins. J Food Sci 2020; 85:4290-4299. [PMID: 33175407 DOI: 10.1111/1750-3841.15513] [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] [Received: 07/16/2020] [Revised: 10/05/2020] [Accepted: 10/11/2020] [Indexed: 11/29/2022]
Abstract
Our study describes in detail the binding mechanism between the main flavonoids that were extracted from onion skins by supercritical CO2 and peptides from whey proteins, from the perspective of obtaining multifunctional ingredients, with health-promoting benefits. The supercritical CO2 extract had 202.31 ± 11.56 mg quercetin equivalents/g DW as the major flavonoid and antioxidant activity of 404.93±1.39 mM Trolox/g DW. The experiments on thermolysin-derived peptides fluorescence quenching by flavonoids extract allowed estimating the binding parameters, in terms of binding constants, and the number of binding sites. The thermodynamic analysis indicated that the main forces involved in complex formation were hydrogen bonds and van der Waals interactions. Molecular docking tests indicated that peptide fluorescence quenching upon gradual addition of onion skin extract might be due to flavonoids binding by Val15 -Ser21 . All 7 to 14 amino acids long peptides appeared to have affinity toward quercetin-3,4'-O-diglucoside and quercetin-4'-O-monoglucoside. The study is important as a potential solution for reuse of valuable resources, underutilized, such as whey peptides and yellow onion skins flavonoids for efficient microencapsulation, as a holistic approach to deliver healthy and nutritious food. PRACTICAL APPLICATION: A growing interest was noticed in the last years in investigating the interactions between proteins and different biologically active compounds, such as to provide knowledge for efficient development of new food, pharmaceutical, and cosmetic products. Recent studies suggest that flavonoid-protein complexes may be designed to improve the functional performance of the flavonoids. The results obtained in this study bring certain benefits in terms of exploiting the bioactive potential of both flavonoids and bioactive peptides, for developing of formulas with improved functional properties.
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Affiliation(s)
- Ștefania Adelina Milea
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, 111 Domnească Street, Galati, 800201, Romania
| | - Iuliana Aprodu
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, 111 Domnească Street, Galati, 800201, Romania
| | - Liliana Mihalcea
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, 111 Domnească Street, Galati, 800201, Romania
| | - Elena Enachi
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, 111 Domnească Street, Galati, 800201, Romania
| | - Carmen Alina Bolea
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, 111 Domnească Street, Galati, 800201, Romania
| | - Gabriela Râpeanu
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, 111 Domnească Street, Galati, 800201, Romania
| | - Gabriela Elena Bahrim
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, 111 Domnească Street, Galati, 800201, Romania
| | - Nicoleta Stănciuc
- Faculty of Food Science and Engineering, Dunărea de Jos University of Galati, 111 Domnească Street, Galati, 800201, Romania
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Chemical, structural and functional properties of whey proteins covalently modified with phytochemical compounds. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2019. [DOI: 10.1007/s11694-019-00217-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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9
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New insights into alpha-lactalbumin behavior upon interaction with resveratrol and curcumin by spectroscopic and molecular modeling techniques: binary and ternary system comparison. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2019. [DOI: 10.1007/s13738-019-01608-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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10
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Cheng H, Fang Z, Liu T, Gao Y, Liang L. A study on β-lactoglobulin-triligand-pectin complex particle: Formation, characterization and protection. Food Hydrocoll 2018. [DOI: 10.1016/j.foodhyd.2018.05.055] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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11
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Retinoic acid prevents immunogenicity of milk lipocalin Bos d 5 through binding to its immunodominant T-cell epitope. Sci Rep 2018; 8:1598. [PMID: 29371615 PMCID: PMC5785490 DOI: 10.1038/s41598-018-19883-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 01/04/2018] [Indexed: 02/08/2023] Open
Abstract
The major cow’s milk allergen Bos d 5 belongs to the lipocalin protein family, with an intramolecular pocket for hydrophobic ligands. We investigated whether Bos d 5 when loaded with the active vitamin A metabolite retinoic acid (RA), would elicit differential immune responses compared to the unloaded state. By in silico docking an affinity energy of −7.8 kcal/mol was calculated for RA into Bos d 5. Loading of RA to Bos d 5 could be achieved in vitro, as demonstrated by ANS displacement assay, but had no effect on serum IgE binding in tolerant or challenge-positive milk allergic children. Bioinformatic analysis revealed that RA binds to the immunodominant T-cell epitope region of Bos d 5. In accordance, Bos d 5 significantly suppressed the CD3+ CD4+ cell numbers, proliferative response and IL-10, IL-13 and IFN-γ secretion from stimulated human PBMCs only when complexed with RA. This phenomenon was neither associated with apoptosis of T-cells nor with the activation of Foxp3+ T-cells, but correlated likely with enhanced stability to lysosomal digestion due to a predicted overlap of Cathepsin S cleavage sites with the RA binding site. Taken together, proper loading of Bos d 5 with RA may suppress its immunogenicity and prevent its allergenicity.
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Agudelo D, Bourassa P, Bariyanga J, Tajmir-Riahi H. Loading efficacy and binding analysis of retinoids with milk proteins: a short review. J Biomol Struct Dyn 2017; 36:4246-4254. [DOI: 10.1080/07391102.2017.1411833] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- D. Agudelo
- Département de Chemistry-Biochemistry, Physics, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières G9A 5H7, Québec, Canada
| | - P. Bourassa
- Département de Chemistry-Biochemistry, Physics, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières G9A 5H7, Québec, Canada
| | - J. Bariyanga
- Department of Chemistry, University of Hawaii-West O’ahu, 96-129 Ala Ike, Pearl City 96782, HI, USA
| | - H.A. Tajmir-Riahi
- Département de Chemistry-Biochemistry, Physics, Université du Québec à Trois-Rivières, C. P. 500, Trois-Rivières G9A 5H7, Québec, Canada
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Zhu J, Sun X, Wang S, Xu Y, Wang D. Formation of nanocomplexes comprising whey proteins and fucoxanthin: Characterization, spectroscopic analysis, and molecular docking. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2016.09.027] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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14
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Abazari O, Shafaei Z, Divsalar A, Eslami-Moghadam M, Ghalandari B, Saboury AA. Probing the biological evaluations of a new designed Pt(II) complex using spectroscopic and theoretical approaches: human hemoglobin as a target. J Biomol Struct Dyn 2015; 34:1123-31. [DOI: 10.1080/07391102.2015.1071280] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Omid Abazari
- Department of Cell & Molecular Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| | - Zahra Shafaei
- Department of Cell & Molecular Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| | - Adeleh Divsalar
- Department of Cell & Molecular Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| | | | - Behafarid Ghalandari
- Department of Medical Nanotechnology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Ali Akbar Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
- Center of Excellence in Biothermodynamics, University of Tehran, Tehran, Iran
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Khorsand Ahmadi S, Mahmoodian Moghadam M, Mokaberi P, Reza Saberi M, Chamani J. A comparison study of the interaction between β-lactoglobulin and retinol at two different conditions: spectroscopic and molecular modeling approaches. J Biomol Struct Dyn 2014; 33:1880-98. [DOI: 10.1080/07391102.2014.977351] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Roth-Walter F, Pacios LF, Gomez-Casado C, Hofstetter G, Roth GA, Singer J, Diaz-Perales A, Jensen-Jarolim E. The major cow milk allergen Bos d 5 manipulates T-helper cells depending on its load with siderophore-bound iron. PLoS One 2014; 9:e104803. [PMID: 25117976 PMCID: PMC4130594 DOI: 10.1371/journal.pone.0104803] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Accepted: 07/14/2014] [Indexed: 11/18/2022] Open
Abstract
The mechanisms of allergic sensitization to milk are still elusive. The major allergen Bos d 5 belongs to the lipocalin-family and thus is able to transport numerous ligands. In this study we investigated its ability to bind to iron-siderophore complexes and tested the immune-modulatory properties of Bos d 5 in either forms. Structural and in silico docking analysis of Bos d 5 revealed that Bos d 5 is able to bind to iron via catechol-based flavonoids (quercetin, myricetin, luteolin) that act as siderophores as confirmed by spectral-analysis and iron staining. Calculated dissociation constants of docking analyses were below 1 µM by virtual addition of iron. When incubated with human peripheral blood mononuclear cells (PBMCs), only the apo-form of Bos d 5 led to an increase of CD4+positive cells and significantly elevated IL13 and IFNγ-levels. In contrast, holo-Bos d 5 decreased numbers of CD4 expressing cells and induced apoptosis. Taken together, our data give evidence that Bos d 5 is capable of binding iron via siderophores. Moreover, our data support for the first time the notion that the form of application (apo- or holo-form) is decisive for the subsequent immune response. The apo-form promotes Th2 cells and inflammation, whereas the holo-form appears to be immunosuppressive.
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Affiliation(s)
- Franziska Roth-Walter
- Comparative Medicine, Messerli Research Institute of the University of Veterinary Medicine Vienna, Medical University Vienna and University Vienna, Vienna, Austria
| | - Luis F. Pacios
- Biotechnology Department, Center for Plant Biotechnology and Genomics, Technical University of Madrid, Madrid, Spain
| | - Cristina Gomez-Casado
- Biotechnology Department, Center for Plant Biotechnology and Genomics, Technical University of Madrid, Madrid, Spain
| | - Gerlinde Hofstetter
- Comparative Medicine, Messerli Research Institute of the University of Veterinary Medicine Vienna, Medical University Vienna and University Vienna, Vienna, Austria
| | - Georg A. Roth
- Department of Anesthesiology, General Intensive Care and Pain Medicine, Medical University of Vienna, Austria
| | - Josef Singer
- Comparative Immunology and Oncology, Department of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Araceli Diaz-Perales
- Biotechnology Department, Center for Plant Biotechnology and Genomics, Technical University of Madrid, Madrid, Spain
| | - Erika Jensen-Jarolim
- Comparative Medicine, Messerli Research Institute of the University of Veterinary Medicine Vienna, Medical University Vienna and University Vienna, Vienna, Austria
- Comparative Immunology and Oncology, Department of Pathophysiology and Allergy Research, Center of Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
- * E-mail:
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Ding F, Peng W, Peng YK, Jiang YT. Renal protein reactivity and stability of antibiotic amphenicols: structure and affinity. MOLECULAR BIOSYSTEMS 2014; 10:2509-16. [PMID: 25016933 DOI: 10.1039/c4mb00220b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present work, the molecular recognition of the oldest active amphenicols by the most popular renal carrier, lysozyme, was deciphered by using fluorescence, circular dichroism (CD) and molecular modeling at the molecular scale. Steady state fluorescence data showed that the recognition of amphenicol by lysozyme yields a static type of fluorescence quenching. This corroborates time-resolved fluorescence results that lysozyme-amphenicol adduct formation has a moderate affinity of 10(4) M(-1), and the driving forces were found to be chiefly hydrogen bonds, hydrophobic interactions and π stacking. Far-UV CD spectra confirmed that the spatial structure of lysozyme was slightly changed with a distinct reduction of α-helices in the presence of amphenicol, suggesting partial destabilization of the protein. Furthermore, via the extrinsic 8-anilino-1-naphthalenesulfonic acid fluorescence spectral properties and molecular modeling, one could see that the amphenicol binding site was situated at the deep crevice on the protein surface, and the ligand was also near to several crucial amino acid residues, such as Trp-62, Trp-63 and Arg-73. Simultaneously, contrastive studies of protein-amphenicols revealed clearly that some substituting groups, e.g. nitryl in the molecular structure of ligands, may be vitally important for the recognition activity of amphenicols with lysozyme. Due to the connection of amphenicols with fatal detrimental effects and because lysozyme has been applied as a drug carrier for proximal tubular targeting, the discussion herein is necessary for rational antibiotic use, development of safe antibiotics and particularly a better appraisal of the risks associated with human exposure to toxic agrochemicals.
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Affiliation(s)
- Fei Ding
- College of Food Science & Engineering, Northwest A&F University, Yangling 712100, China.
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Keppler JK, Stuhldreier MC, Temps F, Schwarz K. Influence of mathematical models and correction factors on binding results of polyphenols and retinol with β-lactoglobulin measured with fluorescence quenching. FOOD BIOPHYS 2014. [DOI: 10.1007/s11483-013-9328-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Domínguez-Ramírez L, Del Moral-Ramírez E, Cortes-Hernández P, García-Garibay M, Jiménez-Guzmán J. β-lactoglobulin's conformational requirements for ligand binding at the calyx and the dimer interphase: a flexible docking study. PLoS One 2013; 8:e79530. [PMID: 24255705 PMCID: PMC3821863 DOI: 10.1371/journal.pone.0079530] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 10/02/2013] [Indexed: 01/10/2023] Open
Abstract
β-lactoglobulin (BLG) is an abundant milk protein relevant for industry and biotechnology, due significantly to its ability to bind a wide range of polar and apolar ligands. While hydrophobic ligand sites are known, sites for hydrophilic ligands such as the prevalent milk sugar, lactose, remain undetermined. Through the use of molecular docking we first, analyzed the known fatty acid binding sites in order to dissect their atomistic determinants and second, predicted the interaction sites for lactose with monomeric and dimeric BLG. We validated our approach against BLG structures co-crystallized with ligands and report a computational setup with a reduced number of flexible residues that is able to reproduce experimental results with high precision. Blind dockings with and without flexible side chains on BLG showed that: i) 13 experimentally-determined ligands fit the calyx requiring minimal movement of up to 7 residues out of the 23 that constitute this binding site. ii) Lactose does not bind the calyx despite conformational flexibility, but binds the dimer interface and an alternate Site C. iii) Results point to a probable lactolation site in the BLG dimer interface, at K141, consistent with previous biochemical findings. In contrast, no accessible lysines are found near Site C. iv) lactose forms hydrogen bonds with residues from both monomers stabilizing the dimer through a claw-like structure. Overall, these results improve our understanding of BLG's binding sites, importantly narrowing down the calyx residues that control ligand binding. Moreover, our results emphasize the importance of the dimer interface as an insufficiently explored, biologically relevant binding site of particular importance for hydrophilic ligands. Furthermore our analyses suggest that BLG is a robust scaffold for multiple ligand-binding, suitable for protein design, and advance our molecular understanding of its ligand sites to a point that allows manipulation to control binding.
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Affiliation(s)
- Lenin Domínguez-Ramírez
- Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Lerma, Lerma de Villada, Lerma, México
- * E-mail:
| | - Elizabeth Del Moral-Ramírez
- Departamento de Ciencias de la Alimentación, Universidad Autónoma Metropolitana-Lerma, Lerma de Villada, México
| | - Paulina Cortes-Hernández
- Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Lerma, Lerma de Villada, Lerma, México
| | - Mariano García-Garibay
- Departamento de Ciencias de la Alimentación, Universidad Autónoma Metropolitana-Lerma, Lerma de Villada, México
- Departamento de Biotecnología, Universidad Autónoma Metropolitana, Iztapalapa, Mexico City, Mexico
| | - Judith Jiménez-Guzmán
- Departamento de Ciencias de la Alimentación, Universidad Autónoma Metropolitana-Lerma, Lerma de Villada, México
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Gutiérrez FJ, Albillos SM, Casas-Sanz E, Cruz Z, García-Estrada C, García-Guerra A, García-Reverter J, García-Suárez M, Gatón P, González-Ferrero C, Olabarrieta I, Olasagasti M, Rainieri S, Rivera-Patiño D, Rojo R, Romo-Hualde A, Sáiz-Abajo MJ, Mussons ML. Methods for the nanoencapsulation of β-carotene in the food sector. Trends Food Sci Technol 2013. [DOI: 10.1016/j.tifs.2013.05.007] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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21
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Ali M, Homann T, Khalil M, Kruse HP, Rawel H. Milk whey protein modification by coffee-specific phenolics: effect on structural and functional properties. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:6911-6920. [PMID: 23790002 DOI: 10.1021/jf402221m] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A suitable vehicle for integration of bioactive plant constituents is proposed. It involves modification of proteins using phenolics and applying these for protection of labile constituents. It dissects the noncovalent and covalent interactions of β-lactoglobulin with coffee-specific phenolics. Alkaline and polyphenol oxidase modulated covalent reactions were compared. Tryptic digestion combined with MALDI-TOF-MS provided tentative allocation of the modification type and site in the protein, and an in silico modeling of modified β-lactoglobulin is proposed. The modification delivers proteins with enhanced antioxidative properties. Changed structural properties and differences in solubility, surface hydrophobicity, and emulsification were observed. The polyphenol oxidase modulated reaction provides a modified β-lactoglobulin with a high antioxidative power, is thermally more stable, requires less energy to unfold, and, when emulsified with lutein esters, exhibits their higher stability against UV light. Thus, adaptation of this modification provides an innovative approach for functionalizing proteins and their uses in the food industry.
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Affiliation(s)
- Mostafa Ali
- Institute of Nutritional Science, University of Potsdam, Nuthetal, Germany
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22
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Keppler JK, Koudelka T, Palani K, Stuhldreier MC, Temps F, Tholey A, Schwarz K. Characterization of the covalent binding of allyl isothiocyanate to β-lactoglobulin by fluorescence quenching, equilibrium measurement, and mass spectrometry. J Biomol Struct Dyn 2013; 32:1103-17. [PMID: 23808652 DOI: 10.1080/07391102.2013.809605] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Reversible binding of small compounds through hydrophobic interactions or hydrogen bonding to food proteins (e.g. milk proteins) is a thoroughly researched topic. In contrast, covalent interactions are not well characterized. Here, we report a rare form of positive-cooperativity-linear binding of allyl isothiocyanate with β-lactoglobulin, resulting in the cleavage of a disulfide bond of the protein. We compared three methods (i.e. fluorescence quenching, equilibrium dialysis, and headspace-water equilibrium) to characterize the binding kinetics and investigated the molecular binding by mass spectrometry. The methodologies used were found to be comparable and reproducible in the presence of high and low ligand concentrations for fluorescence quenching and equilibrium-based methods respectively.
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Affiliation(s)
- Julia Katharina Keppler
- a Institute of Human Nutrition and Food Science, Food Technology , Christian-Albrechts-Universität zu Kiel , Kiel , Germany
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23
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Liu Y, Shaw JJ, Swaisgood HE, Allen JC. Bioavailability of Oil-Based and β -Lactoglobulin-Complexed Vitamin A in a Rat Model. ISRN NUTRITION 2013; 2013:270580. [PMID: 24967254 PMCID: PMC4045273 DOI: 10.5402/2013/270580] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2012] [Accepted: 01/03/2013] [Indexed: 11/23/2022]
Abstract
β -Lactoglobulin is capable of binding fat-soluble compounds including vitamin A palmitate and is suggested to specifically enhance intestinal uptake of retinol. In this study, bioavailability of a vitamin-A-retinyl palmitate complex in skim milk and in water-based liquids was investigated in vitamin-A-depleted rats. First, rats were fed a vitamin-A-free pellet diet for 6 wk and were thereafter gavage-fed with vitamin A in oil, vitamin-A- β -lactoglobulin complex, vitamin A in oil + skim milk, and vitamin-A- β -lactoglobulin + skim milk for 2 wk and 42 wk. Vitamin A repletion, as judged by vitamin A accumulation in serum and liver, occurred in all the treatments. Vitamin-A- β -lactoglobulin complex treatments had statistical equivalence with oil-based vitamin A treatments. In a second experiment, vitamin-A-depleted rats were fed UHT-processed skim milk fortified with either oil-based or freeze-dried β -lactoglobulin-complexed retinyl palmitate. Liver and serum vitamin A were analyzed by HPLC to indicate vitamin A status in the rats. Results showed no significant difference in bioavailability of retinyl palmitate from milk made with either regular oil-based or β -lactoglobulin-complexed fortifiers. The vitamin-A- β -lactoglobulin complex, being water soluble, may be useful for fortification of nonfat products.
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Affiliation(s)
| | | | | | - Jonathan C. Allen
- Interdepartmental Program in Nutrition, Department of Food Bioprocessing and Nutrition Sciences, North Carolina State University, Raleigh, NC 27695, USA
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