101
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Wu X, Nishinari K, Gao Z, Zhao M, Zhang K, Fang Y, Phillips GO, Jiang F. Gelation of β-lactoglobulin and its fibrils in the presence of transglutaminase. Food Hydrocoll 2016. [DOI: 10.1016/j.foodhyd.2015.09.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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102
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Sánchez-Rivera L, Ménard O, Recio I, Dupont D. Peptide mapping during dynamic gastric digestion of heated and unheated skimmed milk powder. Food Res Int 2015. [DOI: 10.1016/j.foodres.2015.08.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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103
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Affiliation(s)
- Eric Dickinson
- School of Food Science and Nutrition, University of Leeds, Leeds LS2 9JT, United Kingdom;
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104
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Serfert Y, Lamprecht C, Tan CP, Keppler J, Appel E, Rossier-Miranda F, Schroen K, Boom R, Gorb S, Selhuber-Unkel C, Drusch S, Schwarz K. Characterisation and use of β-lactoglobulin fibrils for microencapsulation of lipophilic ingredients and oxidative stability thereof. J FOOD ENG 2014. [DOI: 10.1016/j.jfoodeng.2014.06.026] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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105
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Effect of heat-induced formation of rice bran protein fibrils on morphological structure and physicochemical properties in solutions and gels. Food Sci Biotechnol 2014. [DOI: 10.1007/s10068-014-0194-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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106
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Batzli KM, Love BJ. Agitation of amyloid proteins to speed aggregation measured by ThT fluorescence: a call for standardization. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 48:359-64. [PMID: 25579934 DOI: 10.1016/j.msec.2014.09.015] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 09/11/2014] [Indexed: 10/24/2022]
Abstract
This retrospective study of protein aggregation measured by Thioflavin T (ThT) fluorescence assay in published literature has assessed protein sensitivity to denaturing conditions that include elevated temperatures, fluctuations in pH, and concentration and, in particular, agitation to induce amyloid structure formation. The dynamic tracking of fluorescence shows a sigmoidal evolution as aggregates form; the resulting kinetics of association have been analyzed to explore the range of aggregation behavior which occurs based on environmental parameters. Comparisons between the experimental results of different groups have been historically difficult due to subtleties of experimental procedures including denaturing temperature, protein type and concentration, formulation differences, and how agitation is achieved. While it is clear that agitation has a strong influence on the driving force for aggregation, the use of magnetic stirring bar or shaker table rotational speed is insufficient to characterize the degree of turbulence produced during shear. The pathway forward in resolving dependence of aggregate formation on shear may require alternative methodologies or better standardization of the experimental protocols.
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Affiliation(s)
- Kiersten M Batzli
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
| | - Brian J Love
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA; Macromolecular Science and Engineering Research Center, University of Michigan, Ann Arbor, MI 48109, USA; Department of Biomedical Engineering and Biologic and Materials Sciences (Dentistry), University of Michigan, Ann Arbor, MI 48109, USA.
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107
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Loveday SM, Ye A, Anema SG, Singh H. Tuning heat-induced colloidal aggregation of whey proteins, sodium caseinate and gum arabic: Effect of protein composition, preheating and gum arabic level. Food Res Int 2014. [DOI: 10.1016/j.foodres.2014.02.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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108
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Effects of additional fibrils on structural and rheological properties of rice bran albumin solution and gel. Eur Food Res Technol 2014. [DOI: 10.1007/s00217-014-2294-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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109
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110
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Tavares GM, Croguennec T, Carvalho AF, Bouhallab S. Milk proteins as encapsulation devices and delivery vehicles: Applications and trends. Trends Food Sci Technol 2014. [DOI: 10.1016/j.tifs.2014.02.008] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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111
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Dave AC, Loveday SM, Anema SG, Jameson GB, Singh H. Glycation as a Tool To Probe the Mechanism of β-Lactoglobulin Nanofibril Self-Assembly. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:3269-3278. [PMID: 24620751 DOI: 10.1021/jf405441g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this study we investigated the effects of different levels of glucosylation and lactosylation on β-Lg self-assembly into nanofibrils at 80 °C and pH 2. Fibrils in heated samples were detected with the thioflavin T assay and transmission electron microscopy, while SDS-PAGE was used to investigate the composition of the heated solutions and fibrils. Glycation had different effects in the nucleation and growth phases. The effect of glycation on the nucleation phase depended on the degree of glycation but not the sugar type, whereas both the type of sugar and the degree of glycation affected the rate of fibril growth. Glycation by either sugar strongly inhibited self-assembly in the growth phase, and lactosylation produced a much stronger effect than glucosylation. We suggest that the varying glycation susceptibility of different lysine residues can explain these observations. The large, polar sugar residues on the glycated fibrillogenic peptides may inhibit fibril assembly by imposing steric restrictions and disrupting hydrophobic interactions.
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Affiliation(s)
| | | | - Skelte G Anema
- Fonterra Research and Development Centre, Dairy Farm Road, Private Bag 11029, Palmerston North, New Zealand
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112
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Ghalandari B, Divsalar A, Saboury AA, Haertlé T, Parivar K, Bazl R, Eslami-Moghadam M, Amanlou M. Spectroscopic and theoretical investigation of oxali-palladium interactions with β-lactoglobulin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 118:1038-1046. [PMID: 24161866 DOI: 10.1016/j.saa.2013.09.126] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 09/19/2013] [Accepted: 09/29/2013] [Indexed: 06/02/2023]
Abstract
The possibility of using a small cheap dairy protein, β-lactoglobulin (β-LG), as a carrier for oxali-palladium for drug delivery was studied. Their binding in an aqueous solution at two temperatures of 25 and 37°C was investigated using spectroscopic techniques in combination with a molecular docking study. Fluorescence intensity changes showed combined static and dynamic quenching during β-LG oxali-palladium binding, with the static mode being predominant in the quenching mechanism. The binding and thermodynamic parameters were determined by analyzing the results of quenching and those of the van't Hoff equation. According to obtained results the binding constants at two temperatures of 25 and 37°C are 3.3×10(9) M(-1) and 18.4×10(6) M(-1) respectively. Fluorescence resonance energy transfer (FRET) showed that the experimental results and the molecular docking results were coherent. An absence change of β-LG secondary structure was confirmed by the CD results. Molecular docking results agreed fully with the experimental results since the fluorescence studies also revealed the presence of two binding sites with a negative value for the Gibbs free energy of binding of oxali-palladium to β-LG. Furthermore, molecular docking and experimental results suggest that the hydrophobic effect plays a critical role in the formation of the oxali-palladium complex with β-LG. This agreement between molecular docking and experimental results implies that docking studies may be a suitable method for predicting and confirming experimental results, as shown in this study. Hence, the combination of molecular docking and spectroscopy methods is an effective innovative approach for binding studies, particularly for pharmacophores.
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Affiliation(s)
- Behafarid Ghalandari
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran; Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran
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113
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Sasso L, Suei S, Domigan L, Healy J, Nock V, Williams MAK, Gerrard JA. Versatile multi-functionalization of protein nanofibrils for biosensor applications. NANOSCALE 2014; 6:1629-34. [PMID: 24337159 DOI: 10.1039/c3nr05752f] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Protein nanofibrils offer advantages over other nanostructures due to the ease in their self-assembly and the versatility of surface chemistry available. Yet, an efficient and general methodology for their post-assembly functionalization remains a significant challenge. We introduce a generic approach, based on biotinylation and thiolation, for the multi-functionalization of protein nanofibrils self-assembled from whey proteins. Biochemical characterization shows the effects of the functionalization onto the nanofibrils' surface, giving insights into the changes in surface chemistry of the nanostructures. We show how these methods can be used to decorate whey protein nanofibrils with several components such as fluorescent quantum dots, enzymes, and metal nanoparticles. A multi-functionalization approach is used, as a proof of principle, for the development of a glucose biosensor platform, where the protein nanofibrils act as nanoscaffolds for glucose oxidase. Biotinylation is used for enzyme attachment and thiolation for nanoscaffold anchoring onto a gold electrode surface. Characterization via cyclic voltammetry shows an increase in glucose-oxidase mediated current response due to thiol-metal interactions with the gold electrode. The presented approach for protein nanofibril multi-functionalization is novel and has the potential of being applied to other protein nanostructures with similar surface chemistry.
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Affiliation(s)
- L Sasso
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6140, New Zealand.
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114
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Scholten E, Moschakis T, Biliaderis CG. Biopolymer composites for engineering food structures to control product functionality. FOOD STRUCTURE-NETHERLANDS 2014. [DOI: 10.1016/j.foostr.2013.11.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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115
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Dave AC, Loveday SM, Anema SG, Jameson GB, Singh H. Modulating β-Lactoglobulin Nanofibril Self-Assembly at pH 2 Using Glycerol and Sorbitol. Biomacromolecules 2013; 15:95-103. [DOI: 10.1021/bm401315s] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Anant C. Dave
- Riddet
Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
| | - Simon M. Loveday
- Riddet
Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
| | - Skelte G. Anema
- Riddet
Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
- Fonterra
Research and Development Centre, Private Bag 11 029, Palmerston North, New Zealand
| | - Geoffrey B. Jameson
- Riddet
Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
- Institute
of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand
| | - Harjinder Singh
- Riddet
Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
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116
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Usov I, Adamcik J, Mezzenga R. Polymorphism complexity and handedness inversion in serum albumin amyloid fibrils. ACS NANO 2013; 7:10465-10474. [PMID: 24171389 DOI: 10.1021/nn404886k] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Protein-based amyloid fibrils can show a great variety of polymorphic structures within the same protein precursor, although the origins of these structural homologues remain poorly understood. In this work we investigate the fibrillation of bovine serum albumin--a model globular protein--and we follow the polymorphic evolution by a statistical analysis of high-resolution atomic force microscopy images, complemented, at larger length scales, by concepts based on polymer physics formalism. We identify six distinct classes of coexisting amyloid fibrils, including flexible left-handed twisted ribbons, rigid right-handed helical ribbons and nanotubes. We show that the rigid fibrils originate from flexible fibrils through two diverse polymorphic transitions, first, via a single-fibril transformation when the flexible left-handed twisted ribbons turn into the helical left-handed ribbons, to finally evolve into nanotube-like structures, and second, via a double-fibril transformation when two flexible left-handed twisted ribbons wind together resulting in a right-handed twisted ribbon, followed by a rigid right-handed helical ribbon polymorphic conformation. Hence, the change in handedness occurs with an increase in the level of the fibril's structural organization.
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Affiliation(s)
- Ivan Usov
- Food & Soft Materials Science, Department of Health Scence & Technology, ETH Zurich , Schmelzbergstrasse 9, LFO E23, 8092 Zurich, Switzerland
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117
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Loveday SM, Ye A, Anema SG, Singh H. Heat-induced colloidal interactions of whey proteins, sodium caseinate and gum arabic in binary and ternary mixtures. Food Res Int 2013. [DOI: 10.1016/j.foodres.2013.06.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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118
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Gao YZ, Xu HH, Ju TT, Zhao XH. The effect of limited proteolysis by different proteases on the formation of whey protein fibrils. J Dairy Sci 2013; 96:7383-92. [PMID: 24119812 DOI: 10.3168/jds.2013-6843] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Accepted: 08/13/2013] [Indexed: 11/19/2022]
Abstract
Four proteases: trypsin, protease A, pepsin, and protease M were selected to modify whey protein concentrate (WPC) at a low degree of hydrolysis (0.1, 0.2, and 0.3%) before adjusting to pH 2.0 and heating at 90°C to gain insight into the influence of proteolysis on fibril formation. The kinetics of fibril formation were performed on native and modified WPC using the fluorescent dye thioflavin T in conjunction with transmission electron microscopy and far-UV circular dichroism spectroscopy for the morphological and secondary structural analyses. The change in surface hydrophobicity and content of free sulfhydryl groups were also observed during the formation of fibrils for the native and modified WPC. The content of aggregation and thioflavin T kinetic data indicated that the ability of fibril formation was apparently different for WPC modified by the 4 proteases. Whey protein concentrate modified by trypsin aggregated more during heating and the fibril formation rate was faster than that of the native WPC. Whey protein concentrate modified by the other proteases showed slower aggregation with worse amyloid fibril morphology. Compared with the native WPC, the structure of WPC changed differently after being modified by proteases. The state of α-helix structure for modified WPC played the most important role in the formation of fibrils. Under the mild conditions used in this work, the α-helix structure of WPC modified by trypsin caused little destruction and resulted in fibrils with good morphology; the content of α-helices for WPC modified by other proteases decreased to 36.19 to 50.94%; thus, fibril formation was inhibited. In addition, it was beneficial for the modified WPC to form fibrils such that the surface hydrophobicity increased and the content of free sulfhydryl groups slightly decreased during heating.
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Affiliation(s)
- Yu-Zhe Gao
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, 150030 Harbin, People's Republic of China
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119
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Dave AC, Loveday SM, Anema SG, Loo TS, Norris GE, Jameson GB, Singh H. Β-lactoglobulin self-assembly: structural changes in early stages and disulfide bonding in fibrils. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:7817-7828. [PMID: 23848407 DOI: 10.1021/jf401084f] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Bovine β-lactoglobulin (β-Lg) self-assembles into long amyloid-like fibrils when heated at 80 °C, pH 2, and low ionic strength (<0.015 mM). Heating β-Lg under fibril-forming conditions shows a lag phase before fibrils start forming. We have investigated the structural characteristics of β-Lg during the lag phase and the composition of β-Lg fibrils after their separation using ultracentrifugation. During the lag phase, the circular dichroism spectra of heated β-Lg showed rapid unfolding, and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) of samples showed increasing hydrolysis of β-Lg. The SDS-PAGE profiles of fibrils separated by ultra centrifugation showed that after six hours, the fibrils consisted of a few preferentially accumulated peptides. Two-dimensional SDS-PAGE under reducing and nonreducing conditions showed the presence of disulfide-bonded fragments in the fibrils. The sequences in these peptide bands were characterized by in-gel digestion electrospray ionization (ESI)-MS/MS. The composition of solubilized fibrils was also characterized by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) MS/MS. Both MS analyses showed that peptides in fibrils were primarily from the N-terminal region, although there was some evidence of peptides from the C-terminal part of the molecule present in the higher molecular weight gel bands. We suggest that although the N-terminal region of β-Lg is almost certainly involved in the formation of the fibrils, other peptide fragments linked through disulfide bonds may also be present in the fibrils during self-assembly.
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Affiliation(s)
- Anant C Dave
- Riddet Institute, Massey University, Private Bag 11 222, Palmerston North, New Zealand
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120
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Nicolai T, Durand D. Controlled food protein aggregation for new functionality. Curr Opin Colloid Interface Sci 2013. [DOI: 10.1016/j.cocis.2013.03.001] [Citation(s) in RCA: 217] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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121
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Liu G, Zhong Q. Dispersible and Thermal Stable Nanofibrils Derived from Glycated Whey Protein. Biomacromolecules 2013; 14:2146-53. [DOI: 10.1021/bm400521b] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gang Liu
- Department of Food Science and Technology, The University of Tennessee, Knoxville,
Tennessee, United States
| | - Qixin Zhong
- Department of Food Science and Technology, The University of Tennessee, Knoxville,
Tennessee, United States
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122
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Bouhallab S, Croguennec T. Spontaneous Assembly and Induced Aggregation of Food Proteins. ADVANCES IN POLYMER SCIENCE 2013. [DOI: 10.1007/12_2012_201] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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123
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Loveday SM, Su J, Rao MA, Anema SG, Singh H. Whey protein nanofibrils: Kinetic, rheological and morphological effects of group IA and IIA cations. Int Dairy J 2012. [DOI: 10.1016/j.idairyj.2012.03.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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124
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Hettiarachchi CA, Melton LD, Gerrard JA, Loveday SM. Formation of β-Lactoglobulin Nanofibrils by Microwave Heating Gives a Peptide Composition Different from Conventional Heating. Biomacromolecules 2012; 13:2868-80. [DOI: 10.1021/bm300896r] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Charith A. Hettiarachchi
- Riddet Institute, Private Bag 11222, Palmerston North
4442, New Zealand
- School
of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland
1142, New Zealand
| | - Laurence D. Melton
- Riddet Institute, Private Bag 11222, Palmerston North
4442, New Zealand
- School
of Chemical Sciences, University of Auckland, Private Bag 92019, Auckland
1142, New Zealand
| | - Juliet A. Gerrard
- Riddet Institute, Private Bag 11222, Palmerston North
4442, New Zealand
- Biomolecular
Interaction Centre
and School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
- Industrial Research Limited,
PO Box 31310, Lower Hutt 5040, New Zealand
| | - Simon M. Loveday
- Riddet Institute, Private Bag 11222, Palmerston North
4442, New Zealand
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125
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Da Silva Pinto M, Bouhallab S, De Carvalho AF, Henry G, Putaux JL, Leonil J. Glucose slows down the heat-induced aggregation of β-lactoglobulin at neutral pH. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:214-219. [PMID: 22129243 DOI: 10.1021/jf2037664] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The behavior of β-lactoglobulin (β-Lg) during heat treatments depends on the environmental conditions. The influence of the presence or absence of a reducing sugar, namely, glucose, on the modification of the protein during heating has been studied using fluorescence, polyacrylamide gel electrophoresis (PAGE), size-exclusion chromatography (SEC), and transmission electron microscopy. Glycated products were formed during heating 24 h at 90 °C and pH 7. The fluorescence results revealed an accumulation of the advanced Maillard products and the formation of aggregates during heating. PAGE and SEC data suggested that the products in the control samples were essentially composed of covalently linked fibrillar aggregates and that their formation was faster than that for glycated samples. We showed that glucose affected the growing step of covalent aggregates but not the initial denaturation/aggregation step of native protein. Glucose-modified proteins formed a mixture of short fibrils and polydisperse aggregates. Our results revealed that β-Lg forms fibrils at neutral pH after heating and that glucose slows the formation of these fibrils.
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126
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Lassé M, Gerrard JA, Pearce FG. Aggregation and fibrillogenesis of proteins not associated with disease: a few case studies. Subcell Biochem 2012; 65:253-270. [PMID: 23225007 DOI: 10.1007/978-94-007-5416-4_11] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
While amyloid structures have been well characterised in a medical context, there is increasing interest in studying amyloid-like aggregates in other areas, such as food science and nanomaterials. Several proteins relevant to food processing, including serum albumen, lactoglobulin, lysozyme, ovalbumin, casein, and soy protein isolate have been shown to form fibrillar structures under both physiological and non-physiological conditions. These structures are likely to contribute to the structural characteristics of the final food product. In a biotechnological context, proteins such as insulin and eye lens crystallins can be induced to form amyloid structures which can subsequently be used in biotechnology. One example of this is the use of amyloid fibrils as a scaffold for the immobilisation of enzymes. Another current interest in amyloid fibrils is as a storage form for peptide hormones, including insulin, glucagon and calcitonin. Here, we give an overview of a selection of well characterised proteins that have been studied outside the context of disease.
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Affiliation(s)
- Moritz Lassé
- Biomolecular Interaction Center and School of Biological Sciences, University of Canterbury, Private Bag 4800, 8020, Christchurch, New Zealand,
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127
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Loveday SM, Wang XL, Rao MA, Anema SG, Singh H. Effect of pH, NaCl, CaCl2 and temperature on self-assembly of β-lactoglobulin into nanofibrils: a central composite design study. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:8467-74. [PMID: 21726070 DOI: 10.1021/jf201870z] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The ability of certain globular proteins to self-assemble into amyloid-like fibrils in vitro opens opportunities for the development of new biomaterials with unique functional properties, like highly efficient gelation and viscosity enhancement. This work explored the individual and interacting effects of pH (1 to 3), NaCl (0-100 mM), CaCl(2) (0-80 mM) and heating temperature (80 to 120 °C) on the kinetics of β-lactoglobulin self-assembly and the morphology of resulting nanofibrils. Statistically significant (p < 0.05) interactions included CaCl(2)*temperature, NaCl*pH, CaCl(2)*pH, temperature*pH and NaCl*CaCl(2). Particularly notable was the very rapid self-assembly at pH 3 and the highly nonlinear effect of pH on self-assembly kinetics. Nanofibril morphologies ranged from long and semiflexible or curled and twisted to short and irregular. There did not seem to be a link between the kinetics of fibril formation and the morphology of fibrils, except at pH 3, where self-assembly was very rapid and fibrils were short and irregular, suggesting haphazard, uncontrolled self-assembly.
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Affiliation(s)
- S M Loveday
- Riddet Institute, Massey University, Palmerston North, New Zealand.
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