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Matsuo K, Kumashiro M, Gekko K. Characterization of the mechanism of interaction between α1‐acid glycoprotein and lipid membranes by vacuum‐ultraviolet circular‐dichroism spectroscopy. Chirality 2020; 32:594-604. [DOI: 10.1002/chir.23208] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 01/27/2020] [Accepted: 02/17/2020] [Indexed: 12/11/2022]
Affiliation(s)
- Koichi Matsuo
- Hiroshima Synchrotron Radiation CenterHiroshima University Higashi‐Hiroshima Japan
| | - Munehiro Kumashiro
- Department of Physical Science, Graduate School of ScienceHiroshima University Higashi‐Hiroshima Japan
| | - Kunihiko Gekko
- Hiroshima Synchrotron Radiation CenterHiroshima University Higashi‐Hiroshima Japan
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2
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Ferrari E, Corsini R, Burastero SE, Tanfani F, Spisni A. The allergen Mus m 1.0102: Cysteine residues and molecular allergology. Mol Immunol 2020; 120:1-12. [PMID: 32044430 DOI: 10.1016/j.molimm.2020.01.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 01/23/2020] [Accepted: 01/29/2020] [Indexed: 12/13/2022]
Abstract
Mus m 1.0102 is a member of the mouse Major Urinary Protein family, belonging to the Lipocalins superfamily. Major Urinary Proteins (MUPs) are characterized by highly conserved structural motifs. These include a disulphide bond, involved in protein oxidative folding and protein structure stabilization, and a free cysteine residue, substituted by serine only in the pheromonal protein Darcin (MUP20). The free cysteine is recognized as responsible for the onset of inter- or intramolecular thiol/disulphide exchange, an event that favours protein aggregation. Here we show that the substitution of selected cysteine residues modulates Mus m 1.0102 protein folding, fold stability and unfolding reversibility, while maintaining its allergenic potency. Recombinant allergens used for immunotherapy or employed in allergy diagnostic kits require, as essential features, conformational stability, sample homogeneity and proper immunogenicity. In this perspective, recombinant Mus m 1.0102 might appear reasonably adequate as lead molecule because of its allergenic potential and thermal stability. However, its modest resistance to aggregation renders the protein unsuitable for pharmacological preparations. Point mutation is considered a winning strategy. We report that, among the tested mutants, C138A mutant acquires a structure more resistant to thermal stress and less prone to aggregation, two events that act positively on the protein shelf life. Those features make that MUP variant an attractive lead molecule for the development of a diagnostic kit and/or a vaccine.
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Affiliation(s)
- Elena Ferrari
- Dept. Medicine and Surgery, University of Parma, via Gramsci 14, 43126, Parma, Italy.
| | - Romina Corsini
- Dept. Medicine and Surgery, University of Parma, via Gramsci 14, 43126, Parma, Italy.
| | - Samuele E Burastero
- Div. Immunology, IRCCS San Raffaele, Via Olgettina 60, 20132, Milano, Italy.
| | - Fabio Tanfani
- Dept. Life and Environmental Sciences, Marche Polytechnic University, via Brecce Bianche, 60131, Ancona, Italy.
| | - Alberto Spisni
- Dept. Medicine and Surgery, University of Parma, via Gramsci 14, 43126, Parma, Italy.
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3
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Scirè A, Baldassarre M, Tanfani F, Capraro J, Duranti M, Scarafoni A. Interaction of γ-conglutin from Lupinus albus with model phospholipid membranes: Investigations on structure, thermal stability and oligomerization status. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2018; 1866:1242-1248. [PMID: 30312772 DOI: 10.1016/j.bbapap.2018.10.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 10/02/2018] [Accepted: 10/08/2018] [Indexed: 11/25/2022]
Abstract
Interaction with model phospholipid membranes of lupin seed γ-conglutin, a glycaemia-lowering protein from Lupinus albus seeds, has been studied by means of Fourier-Transform infrared spectroscopy at p2H 7.0 and at p2H 4.5. The protein maintains the same secondary structure both at p2H 7.0 and at p2H 4.5, but at p2H 7.0 a higher 1H/2H exchange was observed, indicating a greater solvent accessibility. The difference in Tm and TD1/2 of the protein at the abovementioned p2H's has been calculated around 20 °C. Infrared measurements have been then performed in the presence of DMPG and DOPA at p2H 4.5. DMPG showed a little destabilizing effect while DOPA exerted a great stabilizing effect, increasing the Tm of γ-conglutin at p2H 4.5 of more than 20 °C. Since γ-conglutin at p2H 4.5 is in the monomeric form, the interaction with DOPA likely promotes the oligomerization even at p2H 4.5. Interaction between DMPG or DOPA and γ-conglutin has been confirmed by turbidity experiments with DMPC:DMPG or DOPC:DOPA SUVs. Turbidity data also showed high-affinity binding of γ-conglutin to anionic SUVs made up with DOPA. The molecular features outlined in this study are relevant to address the applicative exploitation and to delineate a deeper comprehension of the natural functional role of γ-conglutin.
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Affiliation(s)
- Andrea Scirè
- Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, Ancona, Italy.
| | - Maurizio Baldassarre
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden
| | - Fabio Tanfani
- Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, Ancona, Italy
| | - Jessica Capraro
- Department of Food, Environmental and Nutritional Sciences, Università degli Studi di Milano, Milan, Italy
| | - Marcello Duranti
- Department of Food, Environmental and Nutritional Sciences, Università degli Studi di Milano, Milan, Italy
| | - Alessio Scarafoni
- Department of Food, Environmental and Nutritional Sciences, Università degli Studi di Milano, Milan, Italy
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4
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Wen L, Zeng P, Zhang L, Huang W, Wang H, Chen G. Symbiosis theory-directed green synthesis of silver nanoparticles and their application in infected wound healing. Int J Nanomedicine 2016; 11:2757-67. [PMID: 27358563 PMCID: PMC4912321 DOI: 10.2147/ijn.s106662] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
In this study, silver nanoparticles (AgNPs) were synthesized for the first time using an antibacterial endophytic fungus of Chinese medicinal herb Orchidantha chinensis, which has anti-inflammatory and antimicrobial activities. The AgNPs were analyzed by various characterization techniques to reveal their morphology, chemical composition, and stability. Also, the relationship between Chinese medicinal herbs, endophytic fungi, and the property of AgNPs was investigated for the first time. Interestingly, an experiment performed in this study revealed the proteins produced by the endophytic fungus to be capped on the nanoparticles, which led to an increase in the stability of spherical and polydispersed AgNPs with low aggregation for over 6 months. More importantly, further study demonstrated that the AgNPs possessed superior antibacterial activity and effectively promoted wound healing. Altogether, the biosynthesis of active AgNPs using the endophytic fungus from Chinese medicinal herb based on the symbiosis theory is simple, eco-friendly, and promising.
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Affiliation(s)
- Lu Wen
- Department of Pharmaceutics, School of Pharmacy, Guangzhou, People's Republic of China
| | - Pei Zeng
- Department of Pharmaceutics, School of Pharmacy, Guangzhou, People's Republic of China
| | - Liping Zhang
- Department of Pharmaceutics, School of Pharmacy, Guangzhou, People's Republic of China
| | - Wenli Huang
- Department of Pharmaceutics, School of Pharmacy, Guangzhou, People's Republic of China
| | - Hui Wang
- School of Traditional Chinese Medicine, Guangdong Pharmaceutical University, Guangzhou, People's Republic of China
| | - Gang Chen
- Department of Pharmaceutics, School of Pharmacy, Guangzhou, People's Republic of China
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5
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Amyloid fibril formation by bovine α1-acid glycoprotein in a reducing environment: The role of disulfide bridges on the observed aggregation kinetics. Biochimie 2015; 118:244-52. [DOI: 10.1016/j.biochi.2015.09.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Accepted: 09/22/2015] [Indexed: 11/18/2022]
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Kopecký V, Ettrich R, Pazderka T, Hofbauerová K, Řeha D, Baumruk V. Influence of ligand binding on structure and thermostability of human α1-acid glycoprotein. J Mol Recognit 2015; 29:70-9. [DOI: 10.1002/jmr.2496] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 08/05/2015] [Accepted: 08/05/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Vladimír Kopecký
- Institute of Physics, Faculty of Mathematics and Physics; Charles University in Prague; Ke Karlovu 5 CZ-12116 Prague 2 Czech Republic
| | - Rüdiger Ettrich
- Center for Nanobiology and Structural Biology, Institute of Microbiology; Academy of Sciences of the Czech Republic; Zámek 136 CZ-37333 Nové Hrady Czech Republic
- Faculty of Sciences; University of South Bohemia; Zámek 136 CZ-37333 Nové Hrady Czech Republic
| | - Tomáš Pazderka
- Institute of Physics, Faculty of Mathematics and Physics; Charles University in Prague; Ke Karlovu 5 CZ-12116 Prague 2 Czech Republic
| | - Kateřina Hofbauerová
- Institute of Physics, Faculty of Mathematics and Physics; Charles University in Prague; Ke Karlovu 5 CZ-12116 Prague 2 Czech Republic
- Institute of Microbiology; Academy of Sciences of the Czech Republic; Vídeňská 1083 CZ-142 20 Prague 4 Czech Republic
| | - David Řeha
- Center for Nanobiology and Structural Biology, Institute of Microbiology; Academy of Sciences of the Czech Republic; Zámek 136 CZ-37333 Nové Hrady Czech Republic
- Faculty of Sciences; University of South Bohemia; Zámek 136 CZ-37333 Nové Hrady Czech Republic
| | - Vladimír Baumruk
- Institute of Physics, Faculty of Mathematics and Physics; Charles University in Prague; Ke Karlovu 5 CZ-12116 Prague 2 Czech Republic
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Naiyer A, Hassan MI, Islam A, Sundd M, Ahmad F. Structural characterization of MG and pre-MG states of proteins by MD simulations, NMR, and other techniques. J Biomol Struct Dyn 2015; 33:2267-84. [PMID: 25586676 DOI: 10.1080/07391102.2014.999354] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Almost all proteins fold via a number of partially structured intermediates such as molten globule (MG) and pre-molten globule states. Understanding the structure of these intermediates at atomic level is often a challenge, as these states are observed under extreme conditions of pH, temperature, and chemical denaturants. Furthermore, several other processes such as chemical modification, site-directed mutagenesis (or point mutation), and cleavage of covalent bond of natural proteins often lead to MG like partially unfolded conformation. However, the dynamic nature of proteins in these states makes them unsuitable for most structure determination at atomic level. Intermediate states studied so far have been characterized mostly by circular dichroism, fluorescence, viscosity, dynamic light scattering measurements, dye binding, infrared techniques, molecular dynamics simulations, etc. There is a limited amount of structural data available on these intermediate states by nuclear magnetic resonance (NMR) and hence there is a need to characterize these states at the molecular level. In this review, we present characterization of equilibrium intermediates by biophysical techniques with special reference to NMR.
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Affiliation(s)
- Abdullah Naiyer
- a Centre for Interdisciplinary Research in Basic Sciences , Jamia Millia Islamia , Jamia Nagar, New Delhi - 110025 , India
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8
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Bovine α1-acid glycoprotein, a thermostable version of its human counterpart: Insights from Fourier transform infrared spectroscopy and in silico modelling. Biochimie 2014; 102:19-28. [DOI: 10.1016/j.biochi.2014.02.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Accepted: 02/04/2014] [Indexed: 11/19/2022]
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9
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Espinosa-Marzal RM, Fontani G, Reusch FB, Roba M, Spencer ND, Crockett R. Sugars communicate through water: oriented glycans induce water structuring. Biophys J 2014; 104:2686-94. [PMID: 23790377 DOI: 10.1016/j.bpj.2013.05.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 04/16/2013] [Accepted: 05/06/2013] [Indexed: 01/13/2023] Open
Abstract
Cells are coated with a glycocalyx-a layer of carbohydrate-containing biomolecules, such as glycoproteins. Although the structure and orientation of the cell-surface glycans are frequently regarded as being random, we have found, using α-1-acid glycoprotein and antitrypsin as model systems for surface glycans, that this is not the case. A glycoprotein monolayer was adsorbed onto hydrophilic and hydrophobic substrates. Surface-force measurements revealed that the orientation of the glycans with respect to the aqueous solution has a profound effect on the structure of vicinal water. The glycan antennae of the surface-adsorbed glycoproteins apparently impose an ordering on the water, resulting in a strong repulsive force over some tens of nanometers with superposed film-thickness transitions ranging from ≈0.7 to 1.8 nm. When the glycan orientation is modified by chemical means, this long-range repulsion disappears. These results may provide an explanation as to why the multiantennary structure is ubiquitous in glycoproteins. Although direct, specific interactions between glycans and other biomolecules are essential for their functionality, these results indicate that glycans' long-range structuring of water may also influence their ability to interact with biomolecules in their vicinity.
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Affiliation(s)
- Rosa M Espinosa-Marzal
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Zurich, Switzerland
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Scirè A, Baldassarre M, Galeazzi R, Tanfani F. Fibrillation properties of human α₁-acid glycoprotein. Biochimie 2012; 95:158-66. [PMID: 22996070 DOI: 10.1016/j.biochi.2012.09.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 09/07/2012] [Indexed: 10/27/2022]
Abstract
Human α(1)-acid glycoprotein (AGP) is a positive acute phase plasma protein containing two disulfide bridges. Structural studies have shown that under specific conditions AGP undergoes aggregation. In this study, we analysed the nature of AGP's aggregates formed under reducing and non-reducing conditions at pH 5.5 and at relatively low temperatures. Thioflavin T and Congo red spectroscopic analyses indicated the presence of cross-β structures in both unreduced and reduced AGP aggregates. In these samples amyloid-like fibrils were detected by transmission electron microscopy. The fibrils are branched and bent and present in very large amount in reduced AGP. Kinetics of AGP fibrillation proceeds without a lag phase and the rate constants of cross-β formation are linearly dependent on AGP concentration and result higher under reducing conditions. The data suggest a possible downhill mechanism of polymerization with a first-order monomer concentration dependence. Bioinformatics tools highlighted an extended region that sheathes one side of the molecule containing aggregation-prone regions. Reducing conditions make the extended region less constricted, allowing greater exposure of aggregation-prone regions, thus explaining the higher propensity of AGP to aggregate and fibrillate.
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Affiliation(s)
- Andrea Scirè
- Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, Via Ranieri, 60131 Ancona, Italy
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Lupidi G, Camaioni E, Khalifé H, Avenali L, Damiani E, Tanfani F, Scirè A. Characterization of thymoquinone binding to human α₁-acid glycoprotein. J Pharm Sci 2012; 101:2564-73. [PMID: 22467430 DOI: 10.1002/jps.23138] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Revised: 02/20/2012] [Accepted: 03/13/2012] [Indexed: 11/06/2022]
Abstract
Thymoquinone (TQ) is the main bioactive component isolated from Nigella sativa essential oil and seeds and has been used for the treatment of inflammations, liver disorders, arthritis, and is of great importance as a promising therapeutic drug for different diseases including cancer. This paper reports the first experimental evidence on binding of TQ to human α(1)-acid glycoprotein (AGP), an important drug-binding glycoprotein in human plasma, which affects pharmacokinetic properties of various therapeutic agents. The interaction of TQ with AGP has been characterized by Fourier transform infrared (FTIR) and fluorescence spectroscopy, as well as by molecular docking experiments. FTIR spectroscopy showed that the binding of TQ to AGP slightly increases its thermal stability and shifts the existence of a molten globule-like state observed in a previous study to higher temperature. The binding constants K(a); the number of binding sites n; and the corresponding thermodynamic parameters ΔG, ΔH, and ΔS at different temperatures were calculated through fluorescence spectroscopy. Fluorescence quenching experiments indicated that TQ binding involves hydrophobic interactions and to a lower extent hydrogen bonds, in agreement with molecular docking experiments. The data on binding ability of TQ to AGP represent basic information for the TQ pharmacokinetics such as drug metabolism and distribution in the body.
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Affiliation(s)
- Giulio Lupidi
- Scuola di Scienze del Farmaco e dei Prodotti della Salute, Università degli Studi di Camerino, Camerino, Italy
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