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Viegas IMA, Gonçalves IWV, Santos BS, Fontes A, Pereira MGC, Pereira CF, Pereira GAL. Synthesis of hydrophilic Ag 2Se quantum dots optically optimized by multivariate strategies: an easy one-pot approach. NEW J CHEM 2022. [DOI: 10.1039/d2nj03696g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A simple and fast aqueous synthesis of silver selenide quantum dots is proposed with the aid of multivariate optimization.
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Affiliation(s)
- Isabelle M. A. Viegas
- Department of Fundamental Chemistry, Federal University of Pernambuco, Recife, PE, 50740-560, Brazil
- Danish Offshore Technology Centre, Technical University of Denmark, Kgs. Lyngby, 2800, Denmark
| | - Ingrid W. V. Gonçalves
- Department of Fundamental Chemistry, Federal University of Pernambuco, Recife, PE, 50740-560, Brazil
| | - Beate S. Santos
- Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, PE, 50740-521, Brazil
| | - Adriana Fontes
- Department of Biophysics and Radiobiology, Federal University of Pernambuco, Recife, PE, 50670-901, Brazil
| | - Maria Goreti C. Pereira
- Department of Fundamental Chemistry, Federal University of Pernambuco, Recife, PE, 50740-560, Brazil
| | - Claudete F. Pereira
- Department of Fundamental Chemistry, Federal University of Pernambuco, Recife, PE, 50740-560, Brazil
| | - Giovannia A. L. Pereira
- Department of Fundamental Chemistry, Federal University of Pernambuco, Recife, PE, 50740-560, Brazil
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Liem-Nguyen V, Skyllberg U, Björn E. Methylmercury formation in boreal wetlands in relation to chemical speciation of mercury(II) and concentration of low molecular mass thiols. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 755:142666. [PMID: 33059147 DOI: 10.1016/j.scitotenv.2020.142666] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/22/2020] [Accepted: 09/22/2020] [Indexed: 06/11/2023]
Abstract
Methylmercury (MeHg) is a neurotoxin formed from inorganic divalent mercury (HgII) via microbial methylation, and boreal wetlands have been identified as major sources of MeHg. There is however a lack of studies investigating the relationship between the chemical speciation of HgII and MeHg formation in such environments, in particular regarding to role of thiol compounds. We determined HgII methylation potentials, kmeth, in boreal wetland soils using two HgII isotope tracers: 198Hg(OH)2(aq) and HgII bonded to thiol groups in natural organic matter, 200HgII-NOM(ads), representing HgII sources with high and low availability for methylation. The 198Hg(OH)2(aq) tracer was consistently methylated to a 5-fold higher extent than 200HgII-NOM(ads), independent of environmental conditions. This suggests that the concentration of HgII in porewater was a decisive factor for HgII methylation. A comprehensive thermodynamic speciation model (including HgII complexes with inorganic sulfide (H2S), polysulfides (H2Sn), thiols associated with natural organic matter (NOM-RSH) and specific low molecular mass thiols (LMM-RSH) provided new insights on the speciation of HgII in boreal wetland porewaters, but did not demonstrate any clear relationship between kmeth and the calculated chemical speciation. In contrast, significant positive relationships were observed between kmeth and the sum of LMM thiol compounds of biological origin. We suggest two possible mechanisms underlying these correlations: 1) LMM thiols kinetically control the size and composition of the HgII pool available for microbial uptake, and/or 2) LMM thiols are produced by microbes such that the correlation reflects a relation between microbial activity and MeHg formation.
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Affiliation(s)
- Van Liem-Nguyen
- Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden; Laboratory of Advanced Materials Chemistry, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam
| | - Ulf Skyllberg
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
| | - Erik Björn
- Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden.
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Bemowsky S, Rother A, Willmann W, Köser J, Markiewicz M, Dringen R, Stolte S. Quantification and biodegradability assessment of meso-2,3-dimercaptosuccinic acid adsorbed on iron oxide nanoparticles. NANOSCALE ADVANCES 2019; 1:3670-3679. [PMID: 36133553 PMCID: PMC9419269 DOI: 10.1039/c9na00236g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 08/10/2019] [Indexed: 06/12/2023]
Abstract
Many interesting applications of magnetic iron oxide nanoparticles (IONPs) have recently been developed based on their magnetic properties and promising catalytic activity. Depending on their intended use, such nanoparticles (NPs) are frequently functionalized with proteins, polymers, or other organic molecules such as meso-2,3-dimercaptosuccinic acid (DMSA) to improve their colloidal stability or biocompatibility. Although the coating strongly affects the colloidal properties and environmental behaviour of NPs, quantitative analysis of the coating is often neglected. To address this issue, we established an ion chromatographic method for the quantitative analysis of surface-bound sulfur-containing molecules such as DMSA. The method determines the amount of sulfate generated by complete oxidation of sulfur present in the molecule. Quantification of the DMSA content of DMSA-coated IONPs showed that reproducibly approximately 38% of the DMSA used in the synthesis was adsorbed on the IONPs. Tests for the biodegradability of free and NP-bound DMSA using a microbial community from a wastewater treatment plant showed that both free and NP-bound DMSA was degraded to negligible extent, suggesting long-term environmental stability of DMSA-coated IONPs.
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Affiliation(s)
- S Bemowsky
- UFT - Centre for Environmental Research and Sustainable Technology, Department Sustainable Chemistry, University of Bremen Leobener Straße 6 D-28359 Bremen Germany
| | - A Rother
- UFT - Centre for Environmental Research and Sustainable Technology, Department Sustainable Chemistry, University of Bremen Leobener Straße 6 D-28359 Bremen Germany
| | - W Willmann
- CBIB - Centre for Biomolecular Interactions Bremen, Neurobiochemistry, Faculty 2 (Biology/Chemistry), University of Bremen Leobener Straße 5/NW2 D-28359 Bremen Germany
- UFT - Centre for Environmental Research and Sustainable Technology, Department Neurobiochemistry, University of Bremen Leobener Straße 6 D-28359 Bremen Germany
| | - J Köser
- UFT - Centre for Environmental Research and Sustainable Technology, Department Sustainable Chemistry, University of Bremen Leobener Straße 6 D-28359 Bremen Germany
| | - M Markiewicz
- UFT - Centre for Environmental Research and Sustainable Technology, Department Sustainable Chemistry, University of Bremen Leobener Straße 6 D-28359 Bremen Germany
- Technische Universität Dresden, Faculty of Environmental Sciences, Department of Hydrosciences, Institute of Water Chemistry Bergstraße 66 01069 Dresden Germany
| | - R Dringen
- CBIB - Centre for Biomolecular Interactions Bremen, Neurobiochemistry, Faculty 2 (Biology/Chemistry), University of Bremen Leobener Straße 5/NW2 D-28359 Bremen Germany
- UFT - Centre for Environmental Research and Sustainable Technology, Department Neurobiochemistry, University of Bremen Leobener Straße 6 D-28359 Bremen Germany
| | - S Stolte
- UFT - Centre for Environmental Research and Sustainable Technology, Department Sustainable Chemistry, University of Bremen Leobener Straße 6 D-28359 Bremen Germany
- Technische Universität Dresden, Faculty of Environmental Sciences, Department of Hydrosciences, Institute of Water Chemistry Bergstraße 66 01069 Dresden Germany
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Functional anti-corrosive and anti-bacterial surface coatings based on mercaptosuccinic and thiodipropionic acids and algae oil as renewable feedstock. REACT FUNCT POLYM 2019. [DOI: 10.1016/j.reactfunctpolym.2019.03.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Viegas IMA, Santos BS, Fontes A, Pereira GADL, Pereira CF. Multivariate optimization of optical properties of CdSe quantum dots obtained by a facile one-pot aqueous synthesis. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00105k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Four parameters are simultaneously optimized to provide a simple, fast and reproducible synthesis procedure to obtain high-quality CdSe quantum dots.
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Affiliation(s)
| | | | - Adriana Fontes
- Department of Biophysics and Radiobiology
- Federal University of Pernambuco
- Recife
- Brazil
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Brandt U, Galant G, Meinert-Berning C, Steinbüchel A. Functional analysis of active amino acid residues of the mercaptosuccinate dioxygenase of Variovorax paradoxus B4. Enzyme Microb Technol 2018; 120:61-68. [PMID: 30396400 DOI: 10.1016/j.enzmictec.2018.09.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 08/23/2018] [Accepted: 09/20/2018] [Indexed: 01/20/2023]
Abstract
Thiol dioxygenases are non-heme mononuclear-iron proteins and belong to the cupin superfamily. In 2014, mercaptosuccinate dioxygenase (Msdo) of Variovorax paradoxus B4 was identified as another bacterial cysteine dioxygenase (Cdo) homolog catalyzing the conversion of mercaptosuccinate (MS) into succinate and sulfite. To gain further insights into potentially important amino acid residues for enzyme activity, seven enzyme variants were generated and analyzed. (i) Three variants comprised the substitution of one conserved histidine residue each by leucine, either supposed to be mandatory for coordination of the Fe(II) cofactor (H93 and H95) or to be important for substrate positioning within the active site (H163). The corresponding enzyme variants were completely inactive confirming their essential roles for enzyme activity. (ii) Mutation C100S resulted as well in an inactive enzyme demonstrating its importance for either stability or activity of the protein. (iii) For eukaryotic Cdo, a hydrogen bond network for substrate positioning was postulated, and the corresponding amino acids are basically present in Msdo. Albeit the MsdoQ64A mutation exhibited an increased Km of 0.29 mM when compared to the wildtype with 0.06 mM, it did not significantly affect the specific activity. (iv) The variant MsdoR66A showed only very low activity even when high amounts of enzyme were applied indicating that this residue might be important for catalysis. (v) No strong effect had the mutation Y165F for which a specific enzyme activity of 10.22 μmol min-1 mg-1 protein and a Km value of 0.06 mM with high similarity to those of the wildtype enzyme were obtained. This residue corresponds to Y157 of human Cdo, which is part of the catalytic triad and is supposed to be involved in substrate positioning. Apparently, another residue could fulfill this role in Msdo, since the loss of Y165 did not have a strong effect.
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Affiliation(s)
- Ulrike Brandt
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, D-48149 Münster, Germany
| | - Gulsina Galant
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, D-48149 Münster, Germany
| | - Christina Meinert-Berning
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, D-48149 Münster, Germany
| | - Alexander Steinbüchel
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, D-48149 Münster, Germany; Environmental Science Department, King Abdulaziz University, Jeddah, Saudi Arabia.
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Al Khabbas MH, Ata SA, Abu-Dari KI, Tutunji MF, Mubarak MS. Synthesis and characterization of new 1-hydroxy-2-pyridinethione derivatives: Their lead complexes and efficacy in the treatment of acute lead poisoning in rats. J Trace Elem Med Biol 2017; 44:209-217. [PMID: 28965578 DOI: 10.1016/j.jtemb.2017.08.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 07/27/2017] [Accepted: 08/02/2017] [Indexed: 11/30/2022]
Abstract
A number of new mono- and dihydroxypyridinethione ligands have been synthesized via reaction of dimethylamine and amino acid esters with the active amide obtained from the reaction of 1-hydroxy-2-pyridinethione-4-carboxylic acid (1) and 1,1'-carbonyldiimidazole in DMF. Moreover, the lead complexes of these new ligands were also prepared. Structures of the newly synthesized compounds have been confirmed by different spectroscopic methods such as IR, 1H NMR, and 13C NMR, and by elemental analysis. The effect of these synthesized ligands on the excretion of lead, iron, and zinc, and their distribution in kidneys, liver, and bones in acutely intoxicated rats was investigated and results, for lead, were compared with those of the known drug meso-2,3-dimercaptosuccinic acid (DMSA). Results obtained revealed that compound 5 exhibits remarkable ability in total fecal and urinary excretion of lead and was superior to DMSA. In addition, results show that the concentration of lead in soft tissues and bones was lower in rats treated with HTPL than those treated with DMSA. Furthermore, the concentration of lead in liver tissues obtained from sub-chronic lead-intoxicated rats treated with HTPL was lower than those treated with DMSA and calcium disodium ethylenediaminetetraacetic acid (CaNa2EDTA).
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Affiliation(s)
- Manal H Al Khabbas
- Chemistry Department, Faculty of Science, University of Hail, PO Box 2440, Saudi Arabia
| | - Samah A Ata
- Pharmacy Department, Faculty of Pharmacy, Al-Zaytoonah University of Jordan, 130, Amman 11733, Jordan
| | - Kamal I Abu-Dari
- Department of Chemistry, Faculty of Science, The University of Jordan, Amman 11942, Jordan.
| | - Maha F Tutunji
- Department of Chemistry, Faculty of Science, The University of Jordan, Amman 11942, Jordan
| | - Mohammad S Mubarak
- Department of Chemistry, Faculty of Science, The University of Jordan, Amman 11942, Jordan.
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Meinert C, Brandt U, Heine V, Beyert J, Schmidl S, Wübbeler JH, Voigt B, Riedel K, Steinbüchel A. Proteomic analysis of organic sulfur compound utilisation in Advenella mimigardefordensis strain DPN7T. PLoS One 2017; 12:e0174256. [PMID: 28358882 PMCID: PMC5373536 DOI: 10.1371/journal.pone.0174256] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 03/06/2017] [Indexed: 01/07/2023] Open
Abstract
2-Mercaptosuccinate (MS) and 3,3´-ditiodipropionate (DTDP) were discussed as precursor substance for production of polythioesters (PTE). Therefore, degradation of MS and DTDP was investigated in Advenella mimigardefordensis strain DPN7T, applying differential proteomic analysis, gene deletion and enzyme assays. Protein extracts of cells cultivated with MS, DTDP or 3-sulfinopropionic acid (SP) were compared with those cultivated with propionate (P) and/or succinate (S). The chaperone DnaK (ratio DTDP/P 9.2, 3SP/P 4.0, MS/S 6.1, DTDP/S 6.2) and a Do-like serine protease (DegP) were increased during utilization of all organic sulfur compounds. Furthermore, a putative bacterioferritin (locus tag MIM_c12960) showed high abundance (ratio DTDP/P 5.3, 3SP/P 3.2, MS/S 4.8, DTDP/S 3.9) and is probably involved in a thiol-specific stress response. The deletion of two genes encoding transcriptional regulators (LysR (MIM_c31370) and Xre (MIM_c31360)) in the close proximity of the relevant genes of DTDP catabolism (acdA, mdo and the genes encoding the enzymes of the methylcitric acid cycle; prpC,acnD, prpF and prpB) showed that these two regulators are essential for growth of A. mimigardefordensis strain DPN7T with DTDP and that they most probably regulate transcription of genes mandatory for this catabolic pathway. Furthermore, proteome analysis revealed a high abundance (ratio MS/S 10.9) of a hypothetical cupin-2-domain containing protein (MIM_c37420). This protein shows an amino acid sequence similarity of 60% to a newly identified MS dioxygenase from Variovorax paradoxus strain B4. Deletion of the gene and the adjacently located transcriptional regulator LysR, as well as heterologous expression of MIM_c37420, the putative mercaptosuccinate dioxygenase (Msdo) from A. mimigardefordensis, showed that this protein is the key enzyme of MS degradation in A. mimigardefordensis strain DPN7T (KM 0.2 mM, specific activity 17.1 μmol mg-1 min-1) and is controlled by LysR (MIM_c37410).
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Affiliation(s)
- Christina Meinert
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Ulrike Brandt
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Viktoria Heine
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Jessica Beyert
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Sina Schmidl
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Jan Hendrik Wübbeler
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Birgit Voigt
- Institut für Mikrobiologie, Ernst-Moritz-Arndt-Universität, Greifswald, Germany
| | - Katharina Riedel
- Institut für Mikrobiologie, Ernst-Moritz-Arndt-Universität, Greifswald, Germany
| | - Alexander Steinbüchel
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität, Münster, Germany
- Environmental Science Department, King Abdulaziz University, Jeddah, Saudi Arabia
- * E-mail:
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Liu J, Chen C, Zhu R, Ye X, Jia J, Yang L, Wang Y, Wang W, Ye J, Li Y, Zhu H, Zhao Q, Zhang J, Cheng T, Xia N. Evaluation of immunity to varicella zoster virus with a novel double antigen sandwich enzyme-linked immunosorbent assay. Appl Microbiol Biotechnol 2016; 100:9321-9329. [PMID: 27629124 DOI: 10.1007/s00253-016-7821-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 08/11/2016] [Accepted: 08/15/2016] [Indexed: 02/03/2023]
Abstract
Varicella is a highly contagious disease caused by primary infection of Varicella zoster virus (VZV). Varicella can be severe or even lethal in susceptible adults, immunocompromised patients and neonates. Determination of the status of immunity to VZV is recommended for these high-risk populations. Furthermore, measurement of population immunity to VZV can help in developing proper varicella vaccination programmes. VZV glycoprotein E (gE) is an antigen that has been demonstrated to be a highly accurate indicator of VZV-specific immunity. In this study, recombinant gE (rgE) was used to establish a double antigen sandwich enzyme-linked immunosorbent assay (ELISA). The established sandwich ELISA showed high specificity and sensitivity in the detection of human sera, and it could detect VZV-specific antibodies at a concentration of 11.25 m IU/mL with a detection linearity interval of 11.25 to 360 m IU/mL (R 2 = 0.9985). The double gE antigen sandwich ELISA showed a sensitivity of 95.08 % and specificity of 100 % compared to the fluorescent-antibody-to-membrane-antigen (FAMA) test, and it showed a sensitivity of 100 % and a specificity of 94.74 % compared to a commercial neutralizing antibody detection kit. Thus, the established double antigen sandwich ELISA can be used as a sensitive and specific quantitative method to evaluate immunity to VZV.
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Affiliation(s)
- Jian Liu
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China.,Department of Microbiology and Molecular Genetics, New Jersey Medical School, Rutgers University, 225 Warren Street, Newark, NJ, 070101, USA
| | - Chunye Chen
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China
| | - Rui Zhu
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China
| | - Xiangzhong Ye
- Beijing Wantai Biological Pharmacy Enterprise, Beijing, 102206, China
| | - Jizong Jia
- Beijing Wantai Biological Pharmacy Enterprise, Beijing, 102206, China
| | - Lianwei Yang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China
| | - Yongmei Wang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China
| | - Wei Wang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China
| | - Jianghui Ye
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China
| | - Yimin Li
- Beijing Wantai Biological Pharmacy Enterprise, Beijing, 102206, China
| | - Hua Zhu
- Department of Microbiology and Molecular Genetics, New Jersey Medical School, Rutgers University, 225 Warren Street, Newark, NJ, 070101, USA
| | - Qinjian Zhao
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China
| | - Jun Zhang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China
| | - Tong Cheng
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China.
| | - Ningshao Xia
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, Xiamen University, Xiamen, 361102, China
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Serological Evaluation of Immunity to the Varicella-Zoster Virus Based on a Novel Competitive Enzyme-Linked Immunosorbent Assay. Sci Rep 2016; 6:20577. [PMID: 26853741 PMCID: PMC4744930 DOI: 10.1038/srep20577] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 01/06/2016] [Indexed: 12/18/2022] Open
Abstract
Varicella-zoster virus (VZV) is a highly contagious agent of varicella and herpes zoster. Varicella can be lethal to immunocompromised patients, babies, HIV patients and other adults with impaired immunity. Serological evaluation of immunity to VZV will help determine which individuals are susceptible and evaluate vaccine effectiveness. A collection of 110 monoclonal antibodies (mAbs) were obtained by immunization of mice with membrane proteins or cell-free virus. The mAbs were well characterized, and a competitive sandwich ELISA (capture mAb: 8H6; labelling mAb: 1B11) was established to determine neutralizing antibodies in human serum with reference to the FAMA test. A total of 920 human sera were evaluated. The competitive sandwich ELISA showed a sensitivity of 95.6%, specificity of 99.77% and coincidence of 97.61% compared with the fluorescent-antibody-to-membrane-antigen (FAMA) test. The capture mAb 8H6 was characterized as a specific mAb for VZV ORF9, a membrane-associated tegument protein that interacts with glycoprotein E (gE), glycoprotein B (gB) and glycoprotein C (gC). The labelling mAb 1B11 was characterized as a complement-dependent neutralizing mAb specific for the immune-dominant epitope located on gE, not on other VZV glycoproteins. The established competitive sandwich ELISA could be used as a rapid and high-throughput method for evaluating immunity to VZV.
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