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Fang W, Chi Z, Li W, Zhang X, Zhang Q. Comparative study on the toxic mechanisms of medical nanosilver and silver ions on the antioxidant system of erythrocytes: from the aspects of antioxidant enzyme activities and molecular interaction mechanisms. J Nanobiotechnology 2019; 17:66. [PMID: 31101056 PMCID: PMC6524268 DOI: 10.1186/s12951-019-0502-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 05/09/2019] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND The wide application of silver nanoparticles (AgNPs) in medicals and daily utensils increases the risk of human exposure. The study on cell and protein changes induced by medical AgNPs (20 nm) and Ag+ gave insights into the toxicity mechanisms of them. RESULTS AgNPs and Ag+ affected the enzymatic and non-enzymatic antioxidant systems of red blood cells (RBCs). When RBCs were exposed to AgNPs or Ag+ (0-0.24 μg/mL), catalase (CAT), superoxide dismutase (SOD) and glutathione peroxidase (GPX) were more sensitive to Ag+, whereas the RBCs had slightly higher glutathione (GSH) contents treated by AgNPs. Both AgNPs and Ag+ increased the malondialdehyde (MDA) content of RBCs, but the difference was not significant. The difference in the change of the enzyme activity indicated that AgNPs and Ag+ have different influencing mechanisms on CAT and GPX. And SOD has stronger resistance to both of AgNPs and Ag+. When AgNPs or Ag+ (0-10 μg/mL) was directly applied on enzymatic proteins, although AgNPs or Ag+ at a high concentration was toxic, at the concentration below 0.4 μg/mL could promote the activities of CAT/SOD/GPX. The spectroscopic results (fluorescence, synchronous fluorescence, resonance light scattering and ultraviolet absorption), including the changes in amino acid microenvironment, peptide chain conformation, and aggregation state, indicated that the interaction mechanism and conformational changes were also the important factors for the changes in the activities of SOD/CAT when SOD/CAT were directly exposed to AgNPs or Ag+. CONCLUSIONS Low concentration (< 0.4 μg/mL) of AgNPs is relatively safe and the direct effects of AgNPs and Ag+ on enzymes are important reasons for the change in antioxidant capacity of RBCs.
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Affiliation(s)
- Wenxu Fang
- Department of Environmental Engineering, Harbin Institute of Technology, Weihai, 2# Wenhua West Road, Weihai, 264209, People's Republic of China
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China
| | - Zhenxing Chi
- Department of Environmental Engineering, Harbin Institute of Technology, Weihai, 2# Wenhua West Road, Weihai, 264209, People's Republic of China.
- Guangzhou Key Laboratory of Environmental Exposure and Health, School of Environment, Jinan University, Guangzhou, 510632, People's Republic of China.
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China.
| | - Weiguo Li
- Department of Environmental Engineering, Harbin Institute of Technology, Weihai, 2# Wenhua West Road, Weihai, 264209, People's Republic of China
| | - Xunuo Zhang
- Department of Environmental Engineering, Harbin Institute of Technology, Weihai, 2# Wenhua West Road, Weihai, 264209, People's Republic of China
| | - Qiang Zhang
- Department of Environmental Engineering, Harbin Institute of Technology, Weihai, 2# Wenhua West Road, Weihai, 264209, People's Republic of China
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Stepanenko OV, Stepanenko OV, Bublikov G, Kuznetsova I, Verkhusha V, Turoverov K. Stabilization of structure in near-infrared fluorescent proteins by binding of biliverdin chromophore. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.10.095] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Scognamiglio V, Antonacci A, Lambreva MD, Arduini F, Palleschi G, Litescu SC, Johanningmeier U, Rea G. Application of Biosensors for Food Analysis. Food Saf (Tokyo) 2016. [DOI: 10.1002/9781119160588.ch11] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Scognamiglio V, Arduini F, Palleschi G, Rea G. Biosensing technology for sustainable food safety. Trends Analyt Chem 2014. [DOI: 10.1016/j.trac.2014.07.007] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Stepanenko OV, Bublikov GS, Stepanenko OV, Shcherbakova DM, Verkhusha VV, Turoverov KK, Kuznetsova IM. A knot in the protein structure - probing the near-infrared fluorescent protein iRFP designed from a bacterial phytochrome. FEBS J 2014; 281:2284-98. [PMID: 24628916 DOI: 10.1111/febs.12781] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 02/18/2014] [Accepted: 03/11/2014] [Indexed: 11/30/2022]
Abstract
The possibility of engineering near-infrared fluorescent proteins and biosensors from bacterial phytochrome photoreceptors (BphPs) has led to substantial interest in this family of proteins. The near-infrared fluorescent proteins have allowed non-invasive bio-imaging of deep tissues and whole organs in living animals. BphPs and derived near-infrared fluorescent proteins contain a structural element, called a knot, in their polypeptide chains. The formation of knot structures in proteins was refuted for a long time. Here, we studied the denaturation and renaturation processes of the near-infrared fluorescent probe iRFP, engineered from RpBphP2, which utilizes a heme-derived tetrapyrrole compound biliverdin as a chromophore. iRFP contains a unique figure-of-eight knot. The denaturation and renaturation curves of the iRFP apoform coincided well, suggesting efficient refolding. However, the iRFP holoform exhibited irreversible unfolding and aggregation associated with the bound chromophore. The knot structure in the apoform did not prevent subsequent binding of biliverdin, resulting in the functional iRFP holoform. We suggest that the irreversibility of protein unfolding is caused by post-translational protein modifications, such as chromophore binding, rather than the presence of the knot. These results are essential for future design of BphP-based near-infrared probes, and add important features to our knowledge of protein folding.
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Affiliation(s)
- Olesya V Stepanenko
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology, Russian Academy of Sciences, St Petersburg, Russia
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Stepanenko OV, Stepanenko OV, Staiano M, Kuznetsova IM, Turoverov KK, D’Auria S. The quaternary structure of the recombinant bovine odorant-binding protein is modulated by chemical denaturants. PLoS One 2014; 9:e85169. [PMID: 24409322 PMCID: PMC3883677 DOI: 10.1371/journal.pone.0085169] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 11/22/2013] [Indexed: 11/30/2022] Open
Abstract
A large group of odorant-binding proteins (OBPs) has attracted great scientific interest as promising building blocks in constructing optical biosensors for dangerous substances, such as toxic and explosive molecules. Native tissue-extracted bovine OBP (bOBP) has a unique dimer folding pattern that involves crossing the α-helical domain in each monomer over the other monomer’s β-barrel. In contrast, recombinant bOBP maintaining the high level of stability inherent to native tissue bOBP is produced in a stable native-like state with a decreased tendency for dimerization and is a mixture of monomers and dimers in a buffered solution. This work is focused on the study of the quaternary structure and the folding-unfolding processes of the recombinant bOBP in the absence and in the presence of guanidine hydrochloride (GdnHCl). Our results show that the recombinant bOBP native dimer is only formed at elevated GdnHCl concentrations (1.5 M). This process requires re-organizing the protein structure by progressing through the formation of an intermediate state. The bOBP dimerization process appears to be irreversible and it occurs before the protein unfolds. Though the observed structural changes for recombinant bOBP at pre-denaturing GdnHCl concentrations show a local character and the overall protein structure is maintained, such changes should be considered where the protein is used as a sensitive element in a biosensor system.
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Affiliation(s)
- Olga V. Stepanenko
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, Russia
| | - Olesya V. Stepanenko
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, Russia
| | - Maria Staiano
- Laboratory for Molecular Sensing, IBP-CNR, Naples, Italy
| | - Irina M. Kuznetsova
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, Russia
- St. Petersburg State Polytechnical University, St. Petersburg, Russia
| | - Konstantin K. Turoverov
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, Russia
- * E-mail: (KKT); (SD)
| | - Sabato D’Auria
- Laboratory for Molecular Sensing, IBP-CNR, Naples, Italy
- * E-mail: (KKT); (SD)
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Distinct effects of guanidine thiocyanate on the structure of superfolder GFP. PLoS One 2012; 7:e48809. [PMID: 23144981 PMCID: PMC3492234 DOI: 10.1371/journal.pone.0048809] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Accepted: 10/05/2012] [Indexed: 11/22/2022] Open
Abstract
Having a high folding efficiency and a low tendency to aggregate, the superfolder GFP (sfGFP) offers a unique opportunity to study the folding of proteins that have a β-barrel topology. Here, we studied the unfolding–refolding of sfGFP that was induced by guanidine thiocyanate (GTC), which is a stronger denaturing agent than GdnHCl or urea. Structural perturbations of sfGFP were studied by spectroscopic methods (absorbance, fluorescence, and circular dichroism), by acrylamide quenching of tryptophan and green chromophore fluorescence, and by size-exclusion chromatography. Low concentrations of GTC (up to 0.1 M) induce subtle changes in the sfGFP structure. The pronounced changes in the visible absorption spectrum of sfGFP which are accompanied by a dramatic decrease in tryptophan and green chromophore fluorescence was recorded in the range 0–0.7 M GNC. These alterations of sfGFP characteristics that erroneously can be mixed up with appearance of intermediate state in fact have pure spectroscopic but not structural nature. Higher concentrations of GTC (from 0.7 to 1.7 M), induce a disruption of the sfGFP structure, that is manifested in simultaneous changes of all of the detected parameters. Full recovery of native properties of denaturated sfGFP was observed after denaturant removal. The refolding of sfGFP passes through the accumulation of the off-pathway intermediate state, in which inner alpha-helix and hence green chromophore and Trp57 are still not tuned up to (properly integrated into) the already formed β-barrel scaffold of protein. Incorporation of the chromophore in the β-barrel in the pathway of refolding and restoration of its ability to fluoresce occur in a narrow range of GTC concentrations from 1.0 to 0.7 M, and a correct insertion of Trp 57 occurs at concentrations ranging from 0.7 to 0 M GTC. These two processes determine the hysteresis of protein unfolding and refolding.
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Yin SW, huang KL, Tang CH, Yang XQ, Wen QB, Qi JR. Surface charge and conformational properties of phaseolin, the major globulin in red kidney bean (Phaseolus vulgaris L): effect of pH. Int J Food Sci Technol 2011. [DOI: 10.1111/j.1365-2621.2011.02662.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Stepanenko OV, Stepanenko OV, Povarova OI, Fonin AV, Kuznetsova IM, Turoverov KK, Staiano M, Varriale A, D’Auria S. New Insight into Protein−Ligand Interactions. The Case of the d-Galactose/d-Glucose-Binding Protein from Escherichia coli. J Phys Chem B 2011; 115:2765-73. [DOI: 10.1021/jp1095486] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Olga V. Stepanenko
- Institute of Cytology, Russian Academy of Science, 194064 St. Petersburg, Russia
| | - Olesya V. Stepanenko
- Institute of Cytology, Russian Academy of Science, 194064 St. Petersburg, Russia
| | - Olga I. Povarova
- Institute of Cytology, Russian Academy of Science, 194064 St. Petersburg, Russia
| | - Alexander V. Fonin
- Institute of Cytology, Russian Academy of Science, 194064 St. Petersburg, Russia
| | - Irina M. Kuznetsova
- Institute of Cytology, Russian Academy of Science, 194064 St. Petersburg, Russia
| | | | - Maria Staiano
- CNR, Laboratory for Molecular Sensing, IBP, Naples, Italy
- University of Siena, Siena, Italy
| | | | - Sabato D’Auria
- CNR, Laboratory for Molecular Sensing, IBP, Naples, Italy
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De Stefano L, Rossi M, Staiano M, Mamone G, Parracino A, Rotiroti L, Rendina I, Rossi M, D'Auria S. Glutamine-Binding Protein from Escherichia coli Specifically Binds a Wheat Gliadin Peptide Allowing the Design of a New Porous Silicon-Based Optical Biosensor. J Proteome Res 2006; 5:1241-5. [PMID: 16674114 DOI: 10.1021/pr0600226] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this work, the binding of the recombinant glutamine-binding protein (GlnBP) from Escherichia coli to gliadin peptides, toxic for celiac patients, was investigated by mass spectrometry experiments and optical techniques. Mass spectrometry experiments demonstrated that GlnBP binds the following amino acid sequence: XXQPQPQQQQQQQQQQQQL, present only into the toxic prolamines. The binding of GlnBP to gliadin suggested us to design a new optical biosensor based on nanostructured porous silicon (PSi) for the detection of trace amounts of gliadin in food. The GlnBP, which acts as a molecular probe for the gliadin, was covalently linked to the surface of the PSi wafer by a proper passivation process. The GlnBP-gliadin interaction was revealed as a shift in wavelength of the fringes in the reflectivity spectrum of the PSi layer. The GlnBP, covalently bonded to the PSi chip, selectively recognized the toxic peptide. Finally, the sensor response to the protein concentration was measured in the range 2.0-40.0 microg/L and the sensitivity of the sensor was determined.
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Affiliation(s)
- Luca De Stefano
- Institute for Microelectronics and Microsystems, CNR, Naples, Italy
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De Stefano L, Rotiroti L, Rendina I, Moretti L, Scognamiglio V, Rossi M, D'Auria S. Porous silicon-based optical microsensor for the detection of l-glutamine. Biosens Bioelectron 2006; 21:1664-7. [PMID: 16207529 DOI: 10.1016/j.bios.2005.08.012] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2005] [Revised: 07/11/2005] [Accepted: 08/02/2005] [Indexed: 11/26/2022]
Abstract
The molecular binding between the glutamine-binding protein (GlnBP) from Escherichia coli and L-glutamine (Gln) is optically transduced by means of a biosensor based on porous silicon nano-technology. The sensor operates by the measurement of the interferometric fringes in the reflectivity spectrum of a porous silicon Fabry-Perot layer. The binding event is revealed as a shift in wavelength of the fringes. Due to the hydrophobic interaction with the Si-H terminated surface of the porous silicon, the GlnBP protein, which acts as a molecular probe for Gln, penetrates and links into the pores of the porous silicon matrix. We can thus avoid any preliminary functionalization process of the porous layer surface, which is also prevented from oxidation, at least for few cycles of wet measurements. The binding of Gln to GlnBP has also been investigated at different concentration of GlnBP.
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Affiliation(s)
- Luca De Stefano
- Institute for Microelectronics and Microsystems, Department of Naples, National Council of Research, Italy.
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Current Awareness on Comparative and Functional Genomics. Comp Funct Genomics 2005. [PMCID: PMC2447491 DOI: 10.1002/cfg.425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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