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Kang W, Zhang J, Li H, Yu N, Tang R, Sun X, He L, Sun J, Chen Y. Identification of Major B-Cell Linear Epitopes of Peach Allergen Pru p 3 Using Immune Slot-Blot Microarray Assay. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:8134-8144. [PMID: 35749217 DOI: 10.1021/acs.jafc.2c01448] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Pru p 3, one of the most representative proteins of the lipid transfer proteins (LTPs), is responsible for clinical allergic reactions to food of peach origin. The identification of Pru p 3 epitopes is not comprehensive due to different methods and principles of epitope screening. In addition, evaluation of the stability of the epitopes and the validation of the immunological key amino acids still need further research. Therefore, in the present study, an immune slot-blot microarray assay was performed to screen the epitopes from Pru p 3 overlapping peptide library, and a new epitope (P-1, AA1-16, ITCGQVSSALAPCIPY) was identified and two identified epitopes were deeply investigated (P-2, AA12-27, PCIPYVRGGGAVPPAC; P-3, AA23-38, VPPACCNGIRNVNNLA). The stability of these epitopes was then verified by thermal processing treatment and digestion experiments. Moreover, the key amino acids of the three identified epitopes were obtained by epitope amino acid mutation combined with slot-blot experiments. These findings may contribute to the further understanding of Pru p 3 and the prevention of peach allergy.
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Affiliation(s)
- Wenhan Kang
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, National Engineering Research Center for Functional Foods, School of Food Science Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi 214122, People's Republic of China
- Chinese Academy of Inspection and Quarantine, Beijing 100176, People's Republic of China
| | - Jiukai Zhang
- Chinese Academy of Inspection and Quarantine, Beijing 100176, People's Republic of China
| | - Hong Li
- Allergy Department, State Key Laboratory of Complex Severe and Rare Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Peking Union Medical College Hospital, Beijing 100730, People's Republic of China
| | - Ning Yu
- Chinese Academy of Inspection and Quarantine, Beijing 100176, People's Republic of China
| | - Rui Tang
- Allergy Department, State Key Laboratory of Complex Severe and Rare Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Peking Union Medical College Hospital, Beijing 100730, People's Republic of China
| | - Xiulan Sun
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, National Engineering Research Center for Functional Foods, School of Food Science Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi 214122, People's Republic of China
| | - Lei He
- Chinese Academy of Inspection and Quarantine, Beijing 100176, People's Republic of China
| | - Jinlyu Sun
- Allergy Department, State Key Laboratory of Complex Severe and Rare Diseases, Chinese Academy of Medical Science and Peking Union Medical College, Peking Union Medical College Hospital, Beijing 100730, People's Republic of China
| | - Ying Chen
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, National Engineering Research Center for Functional Foods, School of Food Science Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi 214122, People's Republic of China
- Chinese Academy of Inspection and Quarantine, Beijing 100176, People's Republic of China
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2
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Zhao Y, Ye S, Wan H, Zhang X, Sun M. Characterization and functional properties of conjugates of rice protein with exopolysaccharides from Arthrobacter ps-5 by Maillard reaction. Food Sci Nutr 2021; 9:4745-4757. [PMID: 34531988 PMCID: PMC8441271 DOI: 10.1002/fsn3.2336] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 04/16/2021] [Accepted: 04/19/2021] [Indexed: 11/09/2022] Open
Abstract
The study examined the potential nutritive value of rice protein (RP) through Maillard reaction. Structures and properties of synthetic conjugates of RP and exopolysaccharide (EPS) from Arthrobacter ps-5 were investigated systematically. Fluorescence characteristics and high molecular weight compounds appeared in Maillard reaction products (MRPs). Moreover, EPS or its degradation products in the form of covalent bond cross-linked with RP were identified, where -NH2 disappeared and C=O, C=N and C-N increased. Determination of free -SH residues suggested mutual conversion between disulfide bonds and sulfhydryl groups occurred during Maillard reaction. HPLC analysis identified conjugates with different molecular weight, where melanoprotein was formed by covalent bonds. As RP conjugated with EPS, the molecules spread out and changed the spatial structure. Functional properties of MRPs, including solubility, foaming activity, emulsifying ability and resistance to oxidation, were greatly improved. The study has discovered an efficient method for increasing the application value of plant protein.
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Affiliation(s)
- Yuguang Zhao
- School of Food Science and TechnologyDalian Polytechnic UniversityDalianChina
| | - Shuhong Ye
- School of Food Science and TechnologyDalian Polytechnic UniversityDalianChina
| | - Huiping Wan
- School of Light Industry and Chemistry EngineeringDalian Polytechnic UniversityDalianChina
| | - Xingxing Zhang
- School of Food Science and TechnologyDalian Polytechnic UniversityDalianChina
| | - Mingqi Sun
- School of Food Science and TechnologyDalian Polytechnic UniversityDalianChina
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3
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Suwareh O, Causeur D, Jardin J, Briard-Bion V, Le Feunteun S, Pezennec S, Nau F. Statistical modeling of in vitro pepsin specificity. Food Chem 2021; 362:130098. [PMID: 34090041 DOI: 10.1016/j.foodchem.2021.130098] [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: 02/04/2021] [Revised: 04/13/2021] [Accepted: 05/11/2021] [Indexed: 11/30/2022]
Abstract
The specificity of pepsin, the major protease of gastric digestion, has been previously investigated, but only regarding the primary sequence of the protein substrates. The present study aimed to consider in addition physicochemical and structural characteristics, at the molecular and sub-molecular scales. For six different proteins submitted to in vitro gastric digestion, the peptide bonds cleaved were determined from the peptides released and identified by LC-MS/MS. An original statistical approach, based on propensity scores calculated for each amino acid residue on both sides of the peptide bonds, concluded that preferential cleavage occurred after Leu and Phe, and before Ile. Moreover, reliable statistical models developed for predicting peptide bond cleavage, highlighted the predominant role of the amino acid residues at the N-terminal side of the peptide bonds, up to the seventh position (P7 and P7'). The significant influence of hydrophobicity, charge and structural constraints around the peptide bonds was also evidenced.
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Affiliation(s)
- Ousmane Suwareh
- STLO, INRAE, Institut Agro, 65 rue de Saint-Brieuc, 35042 Rennes, France.
| | - David Causeur
- IRMAR UMR6625, CNRS, Institut Agro, 65 rue de Saint-Brieuc, 35042 Rennes, France.
| | - Julien Jardin
- STLO, INRAE, Institut Agro, 65 rue de Saint-Brieuc, 35042 Rennes, France.
| | | | - Steven Le Feunteun
- STLO, INRAE, Institut Agro, 65 rue de Saint-Brieuc, 35042 Rennes, France.
| | - Stéphane Pezennec
- STLO, INRAE, Institut Agro, 65 rue de Saint-Brieuc, 35042 Rennes, France.
| | - Françoise Nau
- STLO, INRAE, Institut Agro, 65 rue de Saint-Brieuc, 35042 Rennes, France.
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4
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Characterization of the ergometric properties of commercial bioactive dairy peptides. Curr Res Food Sci 2020; 3:296-303. [PMID: 33336191 PMCID: PMC7733010 DOI: 10.1016/j.crfs.2020.11.003] [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] [Indexed: 11/24/2022] Open
Abstract
The thermodynamic properties of bioactive peptides provide insights into their functional behavior and their biological efficacy. We conducted precise analyses of the density, the ultrasonic velocity and the relative attenuation of serial dilutions of three commercial dairy peptides prepared by enzymatic methods. From these we determined the partial specific volume and the partial specific adiabatic compressibility coefficient for the peptides. At concentrations greater than ~2.5 mg mL−1, the apparent values for specific volume and adiabatic compressibility were constant, differing between the three peptides at ±3% for specific volume and ±70% for compressibility. Both specific volume and adiabatic compressibility were highly dependent on concentration, indicating the importance of precise low concentration measurements to obtain correct values for these thermodynamic parameters. From these parameters it was apparent that restructuring of water molecules around the peptides (and their associated counterions) led to compact solutes that were also incompressible. These thermodynamic analyses are critical for understanding how the properties and the beneficial effects of bioactive peptides are influenced by their chemical environment. Dissolved dairy peptide properties distinguishable from ergometric analyses. Specific volume and adiabatic compressibility evaluate bioactive peptide hydration. Commercial bioactive dairy peptides are compact and incompressible. Compactness and incompressibility of peptide affected by hydrogen-bonding amino acids. Solution concentration affects values of measured thermodynamic parameters.
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Development of Disulfide Bond Crosslinked Gelatin/ε-Polylysine Active Edible Film with Antibacterial and Antioxidant Activities. FOOD BIOPROCESS TECH 2020. [DOI: 10.1007/s11947-020-02420-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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6
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Gekko K. Synchrotron-radiation vacuum-ultraviolet circular dichroism spectroscopy in structural biology: an overview. Biophys Physicobiol 2019; 16:41-58. [PMID: 30923662 PMCID: PMC6435020 DOI: 10.2142/biophysico.16.0_41] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 01/13/2019] [Indexed: 12/01/2022] Open
Abstract
Circular dichroism spectroscopy is widely used for analyzing the structures of chiral molecules, including biomolecules. Vacuum-ultraviolet circular dichroism (VUVCD) spectroscopy using synchrotron radiation can extend the short-wavelength limit into the vacuum-ultraviolet region (down to ~160 nm) to provide detailed and new information about the structures of biomolecules in combination with theoretical analysis and bioinformatics. The VUVCD spectra of saccharides can detect the high-energy transitions of chromophores such as hydroxy and acetal groups, disclosing the contributions of inter- or intramolecular hydrogen bonds to the equilibrium configuration of monosaccharides in aqueous solution. The roles of hydration in the fluctuation of the dihedral angles of carboxyl and amino groups of amino acids can be clarified by comparing the observed VUVCD spectra with those calculated theoretically. The VUVCD spectra of proteins markedly improves the accuracy of predicting the contents and number of segments of the secondary structures, and their amino acid sequences when combined with bioinformatics, for not only native but also nonnative and membrane-bound proteins. The VUVCD spectra of nucleic acids confirm the contributions of the base composition and sequence to the conformation in comparative analyses of synthetic poly-nucleotides composed of selected bases. This review surveys these recent applications of synchrotron-radiation VUVCD spectroscopy in structural biology, covering saccharides, amino acids, proteins, and nucleic acids.
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Affiliation(s)
- Kunihiko Gekko
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-0046, Japan
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7
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Kaur A, Banipal PK, Banipal TS. Local anesthetic-bovine serum albumin interactional behaviour: Characterization by volumetric, calorimetric, and spectroscopic methods. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.08.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Siepi M, Politi J, Dardano P, Amoresano A, De Stefano L, Maria Monti D, Notomista E. Modified denatured lysozyme effectively solubilizes fullerene c60 nanoparticles in water. NANOTECHNOLOGY 2017; 28:335601. [PMID: 28525394 DOI: 10.1088/1361-6528/aa744e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Fullerenes, allotropic forms of carbon, have very interesting pharmacological effects and engineering applications. However, a very low solubility both in organic solvents and water hinders their use. Fullerene C60, the most studied among fullerenes, can be dissolved in water only in the form of nanoparticles of variable dimensions and limited stability. Here the effect on the production of C60 nanoparticles by a native and denatured hen egg white lysozyme, a highly basic protein, has been systematically studied. In order to obtain a denatured, yet soluble, lysozyme derivative, the four disulfides of the native protein were reduced and exposed cysteines were alkylated by 3-bromopropylamine, thus introducing eight additional positive charges. The C60 solubilizing properties of the modified denatured lysozyme proved to be superior to those of the native protein, allowing the preparation of biocompatible highly homogeneous and stable C60 nanoparticles using lower amounts of protein, as demonstrated by dynamic light scattering, transmission electron microscopy and atomic force microscopy studies. This lysozyme derivative could represent an effective tool for the solubilization of other carbon allotropes.
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Affiliation(s)
- Marialuisa Siepi
- Department of Biology University of Naples Federico II, Via Cintia, I-80126, Naples, Italy
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9
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Anand U, Ray S, Ghosh S, Banerjee R, Mukherjee S. Structural aspects of a protein-surfactant assembly: native and reduced States of human serum albumin. Protein J 2016; 34:147-57. [PMID: 25821118 DOI: 10.1007/s10930-015-9606-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The inherently present seventeen disulfide bonds of the circulatory protein, human serum albumin (HSA) provide the necessary structural stability. Various spectroscopic approaches were used to investigate the effect of reduction of these disulfide bonds and its binding with the anionic surfactant, sodium dodecyl sulfate (SDS). Based on several spectroscopic analyses, our investigations highlight the following interesting aspects: (1) HSA on reduction loses not only its tertiary structure but also a significant amount of secondary structure as well. However, the reduced state of the protein is not like the molten-globule, (2) this structural loss of the protein due to reduction is more prominent than that caused by higher SDS concentrations alone and can certainly be attributed to the role of disulfide bonds, (3) lower surfactant concentrations provide marginal structural rigidity to the native state of the protein, whereas, higher concentrations of SDS induces secondary structure to the reduced state of HSA, (4) the binding of SDS with both the native and reduced states of HSA, occurred in three distinct stages which was followed by a saturation stage. However, the nature of such binding is different for both the states as investigated by using the Stern-Volmer equations and estimating the thermodynamic parameters. Besides, in contrast to the native state, the reduced state of HSA shows that the lone tryptophan residue gets more buried. However, there occurs a sudden decrement in the lifetime of the tryptophan and the hydrodynamic diameter increases by twofold.
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Affiliation(s)
- Uttam Anand
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, ITI Campus (Gas Rahat) Building, Govindpura, Bhopal, 462 023, Madhya Pradesh, India
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10
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Ergometric studies of proteins: New insights into protein functionality in food systems. Trends Food Sci Technol 2015. [DOI: 10.1016/j.tifs.2015.06.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Abstract
The partial specific (or molar) volume, expansibility, and compressibility of a protein are fundamental thermodynamic quantities for characterizing its structure in solution. We review the definitions, measurements, and implications of these volumetric quantities in relation to protein structural biology. The partial specific volumes under constant molality (isomolal) and chemical potential (isopotential) conditions of the cosolvent (multicomponent systems) are explained in terms of preferential solvent interactions relevant to the solubility and stability of proteins. The partial expansibility is briefly discussed in terms of the effects of temperature on protein-solvent interactions (hydration) and internal packing defects (cavities). We discuss the compressibility-structure-function relationships of proteins based on analyses of the correlations between the partial adiabatic compressibilities and the structures or functions of various globular proteins (including mutants), focusing on the roles of the internal cavities in structural fluctuations. The volume and compressibility changes associated with various conformational transitions are also discussed in terms of the changes in hydration and cavities in order to elucidate the nonnative structures and the transition mechanisms, especially those associated with pressure denaturation.
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12
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Sassi P, Perticaroli S, Comez L, Giugliarelli A, Paolantoni M, Fioretto D, Morresi A. Volume properties and spectroscopy: A terahertz Raman investigation of hen egg white lysozyme. J Chem Phys 2013; 139:225101. [DOI: 10.1063/1.4838355] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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13
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Su PC, Si W, Baker DL, Berger BW. High-yield membrane protein expression from E. coli using an engineered outer membrane protein F fusion. Protein Sci 2013; 22:434-43. [PMID: 23345122 DOI: 10.1002/pro.2224] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Revised: 11/12/2012] [Accepted: 01/15/2013] [Indexed: 11/12/2022]
Abstract
Obtaining high yields of membrane proteins necessary to perform detailed structural study is difficult due to poor solubility and variability in yields from heterologous expression systems. To address this issue, an Escherichia coli-based membrane protein overexpression system utilizing an engineered bacterial outer membrane protein F (pOmpF) fusion has been developed. Full-length human receptor activity-modifying protein 1 (RAMP1) was expressed using pOmpF, solubilized in FC15 and purified to homogeneity. Using circular dichroism and fluorescence spectroscopy, purified full-length RAMP1 is composed of approximately 90% α-helix, and retains its solubility and structure in FC15 over a wide range of temperatures (20-60°C). Thus, our approach provides a useful, complementary approach to achieve high-yield, full-length membrane protein overexpression for biophysical studies.
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Affiliation(s)
- Pin-Chuan Su
- Department of Chemical Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, USA
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14
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Hu CQ, Chen HB, Gao JY, Luo CP, Ma XJ, Tong P. High-pressure microfluidisation-induced changes in the antigenicity and conformation of allergen Ara h 2 purified from Chinese peanut. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2011; 91:1304-1309. [PMID: 21384372 DOI: 10.1002/jsfa.4318] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Revised: 12/16/2010] [Accepted: 12/16/2010] [Indexed: 05/30/2023]
Abstract
BACKGROUND Peanut allergy is one of the most serious food allergies, and Ara h 2 is one of the most important peanut allergens as it is recognised by serum immunoglobulin E from more than 90% of peanut-allergic individuals. Dynamic high-pressure microfluidisation has been widely used in food processing as a new technology. The aim of this study was to investigate the effect of high-pressure microfluidisation on the antigenicity and structure of Ara h 2. Extracted peanut allergen Ara h 2 was treated under a continuous pressure array of 60, 90, 120, 150 and 180 MPa. Immunoreactivity was measured by indirect enzyme-linked immunosorbent assay with rabbit polyclonal antibodies. Secondary structure was analysed by circular dichroism. Surface hydrophobicity and sulfhydryl groups were assessed via fluorescence and UV absorption spectra respectively. RESULTS High-pressure microfluidisation treatment decreased the antigenicity of peanut allergen Ara h 2, changed its secondary structure and increased its UV absorption intensity and surface hydrophobicity. CONCLUSION The change in conformation contributed to the decrease in antigenicity of Ara h 2, and the spatial conformation of peanut allergen Ara h 2 plays a critical role in its antigenicity.
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Affiliation(s)
- Chun-qiu Hu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
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15
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Kim DY, Tanha J. Sodium dodecyl sulfate–polyacrylamide gel electrophoresis for screening nonaggregating human antibody heavy chain variable domains. Anal Biochem 2010; 403:117-9. [DOI: 10.1016/j.ab.2010.04.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2010] [Revised: 04/14/2010] [Accepted: 04/15/2010] [Indexed: 11/27/2022]
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16
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Matsuo K, Watanabe H, Tate SI, Tachibana H, Gekko K. Comprehensive secondary-structure analysis of disulfide variants of lysozyme by synchrotron-radiation vacuum-ultraviolet circular dichroism. Proteins 2009; 77:191-201. [PMID: 19434752 DOI: 10.1002/prot.22430] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
To elucidate the effects of specific disulfide bridges (Cys6-Cys127, Cys30-Cys115, Cys64-Cys80, and Cys76-Cys94) on the secondary structure of hen lysozyme, the vacuum-ultraviolet circular dichroism (VUVCD) spectra of 13 species of disulfide-deficient variants in which Cys residues were replaced with Ala or Ser residues were measured down to 170 nm at pH 2.9 and 25 degrees C using a synchrotron-radiation VUVCD spectrophotometer. Each variant exhibited a VUVCD spectrum characteristic of a considerable amount of residual secondary structures depending on the positions and numbers of deleted disulfide bridges. The contents of alpha-helices, beta-strands, turns, and unordered structures were estimated with the SELCON3 program using the VUVCD spectra and PDB data of 31 reference proteins. The numbers of alpha-helix and beta-strand segments were also estimated from the VUVCD data. In general, the secondary structures were more effectively stabilized through entropic forces as the number of disulfide bridges increased and as they were formed over larger distances in the primary structure. The structures of three-disulfide variants were similar to that of the wild type, but other variants exhibited diminished alpha-helices with a border between the ordered and disordered structures around the two-disulfide variants. The sequences of the secondary structures were predicted for all the variants by combining VUVCD data with a neural-network method. These results revealed the characteristic role of each disulfide bridge in the formation of secondary structures.
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Affiliation(s)
- Koichi Matsuo
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan
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17
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Thakur G, Leblanc RM. Conformation of lysozyme Langmuir monolayer studied by infrared reflection absorption spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:2842-2849. [PMID: 19437700 DOI: 10.1021/la803233p] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The surface chemistry and spectroscopy of the reduced lysozyme Langmuir monolayer were investigated at different pH values to compare with the native one. It was found that the limiting molecular area of the reduced lysozyme was not subphase pH dependent as the native lysozyme. To explain this result in terms of the conformation and orientation of the lysozyme Langmuir monolayer at various subphase pH values, we have used infrared reflection absorption spectroscopy. The interpretation of the results make plausible change of the conformation and orientation of the native lysozyme Langmuir monolayer with the subphase pH 3, 6, and 11.
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Affiliation(s)
- Garima Thakur
- Department of Chemistry, 1301 Memorial Drive, University of Miami, Coral Gables, Florida 33146, USA
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18
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Venkatachalam M, Monaghan EK, Kshirsagar HH, Robotham JM, O'Donnell SE, Gerber MS, Roux KH, Sathe SK. Effects of processing on immunoreactivity of cashew nut (Anacardium occidentale L.) seed flour proteins. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:8998-9005. [PMID: 18795784 DOI: 10.1021/jf801199q] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Cashew nut seeds were subjected to processing including autoclaving (121 degrees C for 5, 10, 20, and 30 min), blanching (100 degrees C for 1, 4, 7, and 10 min), microwave heating (1 and 2 min each at 500 and 1000 W), dry roasting (140 degrees C for 20 and 30 min; 170 degrees C for 15 and 20 min; and 200 degrees C for 10 and 15 min), gamma-irradiation (1, 5, 10, and 25 kGy), and pH (1, 3, 5, 7, 9, 11, and 13). Proteins from unprocessed and processed cashew nut seeds were probed for stability using anti-Ana o 2 rabbit polyclonal antibodies and mouse monoclonal antibodies directed against Ana o 1, Ana o 2, and Ana o 3 as detection agents. Results indicate that Ana o 1, Ana o 2, and Ana o 3 are stable regardless of the processing method to which the nut seeds are subjected.
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Affiliation(s)
- Mahesh Venkatachalam
- Department of Nutrition, Food and Exercise Sciences, Florida State University, Tallahassee, Florida 32306-1493, USA
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19
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Morgado J, Aquino-Olivos MA, Martínez-Hernández R, Corea M, Grolier JPE, del Río JM. Study of the binding between lysozyme and C10-TAB: determination and interpretation of the partial properties of protein and surfactant at infinite dilution. Biophys Chem 2008; 135:51-8. [PMID: 18433980 DOI: 10.1016/j.bpc.2008.03.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2008] [Revised: 03/12/2008] [Accepted: 03/12/2008] [Indexed: 10/22/2022]
Abstract
This work examines the binding in aqueous solution, through the experimental determination of specific volumes and specific adiabatic compressibility coefficients, of decyltrimethylammonium bromide to lysozyme and to non-charged polymeric particles (which have been specially synthesized by emulsion polymerization). A method was developed to calculate the specific partial properties at infinite dilution and it was shown that a Gibbs-Duhem type equation holds at this limit for two solutes. With this equation, it is possible to relate the behavior of the partial properties along different binding types at a constant temperature. It was found that the first binding type, specific with high affinity, is related to a significant reduction of surfactant compressibility. The second binding type is accompanied by the unfolding of the protein and the third one is qualitatively identical to the binding of the surfactant to non-charged polymeric particles.
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Affiliation(s)
- Jorge Morgado
- Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, México DF, México
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20
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Ithurbide A, Frateur I, Galtayries A, Marcus P. XPS and flow-cell EQCM study of albumin adsorption on passivated chromium surfaces: Influence of potential and pH. Electrochim Acta 2007. [DOI: 10.1016/j.electacta.2007.04.109] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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21
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22
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Marchenko NI, Marchenkov VV, Kaĭsheva AL, Kashparov IA, Kotova NV, Kaliman PA, Semisotnov GV. Affinity chromatography of GroEL chaperonin based on denatured proteins: role of electrostatic interactions in regulation of GroEL affinity for protein substrates. BIOCHEMISTRY (MOSCOW) 2007; 71:1357-64. [PMID: 17223789 DOI: 10.1134/s000629790612011x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The chaperonin GroEL of the heat shock protein family from Escherichia coli cells can bind various polypeptides lacking rigid tertiary structure and thus prevent their nonspecific association and provide for acquisition of native conformation. In the present work we studied the interaction of GroEL with six denatured proteins (alpha-lactalbumin, ribonuclease A, egg lysozyme in the presence of dithiothreitol, pepsin, beta-casein, and apocytochrome c) possessing negative or positive total charge at neutral pH values and different in hydrophobicity (affinity for a hydrophobic probe ANS). To prevent the influence of nonspecific association of non-native proteins on their interaction with GroEL and make easier the recording of the complexing, the proteins were covalently attached to BrCN-activated Sepharose. At low ionic strength (lower than 60 mM), tight binding of the negatively charged denatured proteins with GroEL (which is also negatively charged) needed relatively low concentrations (approximately 10 mM) of bivalent cations Mg2+ or Ca2+. At the high ionic strength (approximately 600 mM), a tight complex was produced also in the absence of bivalent cations. In contrast, positively charged denatured proteins tightly interacted with GroEL irrespectively of the presence of bivalent cations and ionic strength of the solution (from 20 to 600 mM). These features of GroEL interaction with positively and negatively charged denatured proteins were confirmed by polarized fluorescence (fluorescence anisotropy). The findings suggest that the affinity of GroEL for denatured proteins can be determined by the balance of hydrophobic and electrostatic interactions.
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Affiliation(s)
- N Iu Marchenko
- Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
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Luthra S, Lechuga-Ballesteros D, Kalonia DS, Pikal MJ. Simultaneous Measurement of Water Desorption Isotherm and Heats of Water Desorption of Proteins Using Perfusion Isothermal Microcalorimetry. J Pharm Sci 2007; 96:1974-82. [PMID: 17290415 DOI: 10.1002/jps.20836] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The purpose of this work was to study protein-water interactions using a perfusion isothermal calorimetry method by simultaneously measuring the water (de)sorption isotherm and heats of desorption (DeltaH(desorption)). Lysozyme, bovine serum albumin (BSA), and a monoclonal immunoglobulin (IgG) were studied. Desorption isotherms and DeltaH(desorption) were calculated using data from two perfusion systems, which measured heat flow resulting from interaction of water vapor with the protein sample and with pure water, respectively. The desorption isotherms calculated from the calorimetry were in good agreement with the gravimetric data. The average DeltaH(desorption) at high hydration was 54.6 kJ/mol and decreased (approaching heat of water evaporation) with desorption and passed through a minimum at protein specific water content, below which it increased again reaching 59.0 kJ/mol at the lowest hydration levels. The difference between the DeltaH(desorption) above the minimum and heat of water evaporation has been attributed to conformational changes in the protein. This conclusion is supported with data for lysozyme in which a dynamic glass like transition has been observed at the water content of the minimum in the calorimetric enthalpy data at 293 K. This work establishes perfusion calorimetry as a rapid and controlled method to study the thermodynamics of protein-water interaction.
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Affiliation(s)
- Sumit Luthra
- Department of Pharmaceutical Sciences U-3092, School of Pharmacy, University of Connecticut, Storrs, Connecticut 06268, USA
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24
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Mori K, Seki Y, Yamada Y, Matsumoto H, Soda K. Evaluation of intrinsic compressibility of proteins by molecular dynamics simulation. J Chem Phys 2007; 125:054903. [PMID: 16942254 DOI: 10.1063/1.2219741] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Molecular dynamics simulation has been performed on five native proteins in water to evaluate their intrinsic isothermal compressibilities beta(T,int). To identify physical factors contributing to protein compressibility, a general method is presented for analyzing the compressibility of mechanically inhomogeneous systems. The value of beta(T,int) varies with protein species considerably: beta-lactoglobulin (14.15 x 10(-2) GPa(-1)) is more than twice as compressible as ribonuclease A (6.77 x 10(-2) GPa(-1)). Beta-lactoglobulin and myoglobin (13.95 x 10(-2) GPa(-1)) have similar values of beta(T,int), but the mechanisms responsible for them are significantly different. The volume fluctuations of internal cavities and the magnitudes of the crosscorrelation between them are the key factors determining beta(T,int) of proteins. Though the volume fractions of internal cavity for the five studied proteins are nearly equal to one another, the mean cavity compressibilities beta(T,cav) vary considerably with protein species and range from 0.35 to 0.69 GPa(-1), which are much smaller than those of normal organic liquids such as methanol, ethanol, and benzene and close to that of glycerol (0.55 GPa(-1)), a strongly associated liquid.
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Affiliation(s)
- Kazuki Mori
- Department of Bioengineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
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25
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Dadarlat VM, Post CB. Decomposition of protein experimental compressibility into intrinsic and hydration shell contributions. Biophys J 2006; 91:4544-54. [PMID: 16997864 PMCID: PMC1779936 DOI: 10.1529/biophysj.106.087726] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The experimental determination of protein compressibility reflects both the protein intrinsic compressibility and the difference between the compressibility of water in the protein hydration shell and bulk water. We use molecular dynamics simulations to explore the dependence of the isothermal compressibility of the hydration shell surrounding globular proteins on differential contributions from charged, polar, and apolar protein-water interfaces. The compressibility of water in the protein hydration shell is accounted for by a linear combination of contributions from charged, polar, and apolar solvent-accessible surfaces. The results provide a formula for the deconvolution of experimental data into intrinsic and hydration contributions when a protein of known structure is investigated. The physical basis for the model is the variation in water density shown by the surface-specific radial distribution functions of water molecules around globular proteins. The compressibility of water hydrating charged atoms is lower than bulk water compressibility, the compressibility of water hydrating apolar atoms is somewhat larger than bulk water compressibility, and the compressibility of water around polar atoms is about the same as the compressibility of bulk water. We also assess whether hydration water compressibility determined from small compound data can be used to estimate the compressibility of hydration water surrounding proteins. The results, based on an analysis from four dipeptide solutions, indicate that small compound data cannot be used directly to estimate the compressibility of hydration water surrounding proteins.
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Affiliation(s)
- Voichita M Dadarlat
- Department of Medicinal Chemistry and Molecular Pharmacology, Markey Center for Structural Biology, Purdue Cancer Center, Purdue University, West Lafayette, IN, USA
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26
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Izutsu KI, Fujimaki Y, Kuwabara A, Hiyama Y, Yomota C, Aoyagi N. Near-infrared analysis of protein secondary structure in aqueous solutions and freeze-dried solids. J Pharm Sci 2006; 95:781-9. [PMID: 16498574 DOI: 10.1002/jps.20580] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Near-infrared spectroscopy (NIR) of various proteins (bovine serum albumin, lysozyme, ovalbumin, gamma-globulin, beta-lactoglobulin, myoglobin, cytochrome-c) was investigated as a possible analytical method of the protein secondary structure in various physical states. The spectra of proteins in aqueous solutions (transmission mode, solvent-compensated) and those in freeze-dried solids (nondestructive diffuse reflection mode) showed several bands at similar frequencies in the combination (4000-5000 cm(-1)) and first overtone (5600-6600 cm(-1)) spectral regions. The normalized second-derivative near-infrared spectra of proteins in aqueous solutions suggested that some bands indicated alpha-helix (4090, 4365-4370, 4615, and 5755 cm(-1)) and beta-sheet (4060, 4405, 4525-4540, 4865, and 5915-5925 cm(-1)) structures. The proteins mostly maintained spectra characteristic of their native structure after freeze-drying, although some reductions in alpha-helical structure and increase in unordered or beta-sheet structures were observed. The near-infrared analysis also showed beta-sheet formation of heat-treated BSA in aqueous solutions and in subsequently freeze-dried solids. The present results thus indicated that the nondestructive near-infrared analysis can be used for the investigation of dehydration-induced changes in protein secondary structures.
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Affiliation(s)
- Ken-Ichi Izutsu
- National Institute of Health Sciences, Kamiyoga, Setagaya 158-8501, Tokyo, Japan.
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Corea M, García MJ, Padilla B, del Río JM. Thermodynamics of Fractions and Its Application to the Hydration Study of the Swelling Process in Functionalized Polymer Particles. J Phys Chem B 2004. [DOI: 10.1021/jp047940g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. Corea
- Research and Development Program in Molecular Engineering, Mexican Institute of Petroleum, Eje Central Lázaro Cárdenas 152, CP 07730 México DF, México, Facultad de Química, DEPFI, Edificio A 1er piso Edificio Universidad Nacional Autónoma de México, Bernardo Quintana Circuito Exterior, Ciudad Universitaria, Coyoacan, C.P. 04510, México, D.F. AP 70228, CP 04510 México DF, México, and Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón Esquina Paseo Tollocan s/n, C.P. 50120, Toluca,
| | - M. J. García
- Research and Development Program in Molecular Engineering, Mexican Institute of Petroleum, Eje Central Lázaro Cárdenas 152, CP 07730 México DF, México, Facultad de Química, DEPFI, Edificio A 1er piso Edificio Universidad Nacional Autónoma de México, Bernardo Quintana Circuito Exterior, Ciudad Universitaria, Coyoacan, C.P. 04510, México, D.F. AP 70228, CP 04510 México DF, México, and Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón Esquina Paseo Tollocan s/n, C.P. 50120, Toluca,
| | - B. Padilla
- Research and Development Program in Molecular Engineering, Mexican Institute of Petroleum, Eje Central Lázaro Cárdenas 152, CP 07730 México DF, México, Facultad de Química, DEPFI, Edificio A 1er piso Edificio Universidad Nacional Autónoma de México, Bernardo Quintana Circuito Exterior, Ciudad Universitaria, Coyoacan, C.P. 04510, México, D.F. AP 70228, CP 04510 México DF, México, and Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón Esquina Paseo Tollocan s/n, C.P. 50120, Toluca,
| | - J. M. del Río
- Research and Development Program in Molecular Engineering, Mexican Institute of Petroleum, Eje Central Lázaro Cárdenas 152, CP 07730 México DF, México, Facultad de Química, DEPFI, Edificio A 1er piso Edificio Universidad Nacional Autónoma de México, Bernardo Quintana Circuito Exterior, Ciudad Universitaria, Coyoacan, C.P. 04510, México, D.F. AP 70228, CP 04510 México DF, México, and Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón Esquina Paseo Tollocan s/n, C.P. 50120, Toluca,
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28
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Bramanti E, Lomonte C, Onor M, Zamboni R, Raspi G, D'Ulivo A. Study of the disulfide reduction of denatured proteins by liquid chromatography coupled with on-line cold-vapor-generation atomic-fluorescence spectrometry (LC-CVGAFS). Anal Bioanal Chem 2004; 380:310-8. [PMID: 15309367 DOI: 10.1007/s00216-004-2746-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2004] [Revised: 06/23/2004] [Accepted: 06/24/2004] [Indexed: 10/26/2022]
Abstract
Hydrophobic-interaction chromatography coupled on-line with chemical-vapor-generation atomic-fluorescence spectrometry (HIC-CVGAFS), optimized recently for the analysis of thiol-containing proteins under denaturing conditions, has been used to study the chemical reduction of denatured proteins. Four proteins chosen as models (human serum albumin (HSA), bovine serum albumin (BSA), alpha-lactalbumin (alpha-Lac) from bovine milk, and lysozyme from chicken egg (Lys)) were denatured with urea and reduced with dithiothreitol (DTT), with selenol as catalyst. The method is based on derivatization of the -SH groups of proteins with p-hydroxymercurybenzoate (PHMB), followed by HIC separation and post-column on-line reaction of the derivatized reduced, denatured proteins with bromine generated in situ. HgII, derived from rapid conversion of uncomplexed and protein-complexed PHMB, is selectively detected by AFS in an Ar/H2 miniaturized flame after sodium borohydride (NaBH4) reduction to Hg degrees . The yield of the reduction was studied as a function of reductant concentration, reduction time (tred), and urea concentration. Results showed that the optimum values for DTT and selenol concentrations and for tred were between 1 and 100 mmol L(-1) and between 1 and 20 min, respectively, depending on the protein studied. The percentage disulfide bond reduction increases as the urea concentration used for protein denaturation increases, giving a single-step sigmoid increment for single-domain, low-MW proteins (alpha-Lac and Lys), and a two-step sigmoid increment for multi-domain, high MW proteins (HSA and BSA). The shapes of plots of percentage reduced disulfide against urea concentration are characteristic of each protein and are correlated with the location of S-S in the protein. Under the adopted conditions complete protein denaturation is the conditio sine qua non for obtaining 100% S-S reduction. The detection limit for denatured, reduced proteins examined under the optimized conditions was found to be in the range 1-5 x 10(-12) mol L(-1) (10-30 pg), depending on the protein considered.
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Affiliation(s)
- Emilia Bramanti
- Laboratory of Instrumental Analytical Chemistry, Italian National Research Council-Istituto per I Processi Chimico-Fisici, Via G. Moruzzi 1, 56124 Pisa, Italy.
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29
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Xia X, Lin CT, Wang G, Fang H. Binding of phlorizin to the C-terminal loop 13 of the Na(+)/glucose cotransporter does not depend on the [560-608] disulfide bond. Arch Biochem Biophys 2004; 425:58-64. [PMID: 15081894 DOI: 10.1016/j.abb.2004.02.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2004] [Revised: 02/19/2004] [Indexed: 11/15/2022]
Abstract
The disulfide bonds of the Na(+)/glucose cotransporter (SGLT1) are believed to participate in the binding of the transport inhibitor phlorizin. Here, we investigated the role of the [560-608] disulfide bond on the phlorizin-binding function of the C-terminal loop 13 of SGLT1 using 3-iodoacetamidophlorizin (3-IAP) as a probe. The reactivity of 3-IAP to the fully reduced loop 13 was competitively inhibited by phlorizin, as evident from the MALDI mass spectra. It indicates that the disulfide bond is not mandatory for phlorizin binding. CD and equilibrium unfolding studies showed that the secondary structure and conformation stability of loop 13 were not affected by removing the disulfide bond. Furthermore, we generated a series of loop 13 mutants to assess the contribution of the disulfide bond to phlorizin binding. A positive correlation between the stability and phlorizin affinity of the mutant proteins was observed, implying that the protein stability, rather than the disulfide bond, is relevant to the phlorizin-binding function of loop 13.
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Affiliation(s)
- Xiaobing Xia
- Beijing Institute of Infectious Diseases, Beijing 10039, PR China.
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