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Marszałek I, Krężel A, Goch W, Zhukov I, Paczkowska I, Bal W. Revised stability constant, spectroscopic properties and binding mode of Zn(II) to FluoZin-3, the most common zinc probe in life sciences. J Inorg Biochem 2016; 161:107-14. [PMID: 27216451 DOI: 10.1016/j.jinorgbio.2016.05.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 05/04/2016] [Accepted: 05/13/2016] [Indexed: 01/01/2023]
Abstract
2-[2-[2-[2-[bis(carboxylatomethyl)amino]-5-methoxyphenoxy]ethoxy]-4-(2,7-difluoro-3-oxido-6-oxo-4a,9a-dihydroxanthen-9-yl)anilino]acetate (FluoZin-3) is used very broadly in life sciences as intra- and extracellular Zn(II) sensor selective for Zn(II) over Co(II), Ca(II) and Mg(II) ions at their physiological concentrations. It has been used for determination of relative and absolute levels of exchangeable Zn(II) in cells and extracellular fluids. Despite its popularity, the knowledge of its acid/base and Zn(II) coordination abilities and of its spectroscopic properties remained very limited. Also the published conditional dissociation constant ((C)Kd) values at pH7.4 are slightly discrepant, (15nM or 8.9nM). In this work we determined the (C)Kd for Zn(II) complexation by FluoZin-3 at pH7.4 with nitrilotriacetic acid (NTA) as competitor using two independent methods: fluorimetry and UV-Vis spectroscopy. For the first time, we investigated FluoZin-3 alone and complexed with Zn(II) in the wide range of pH, determining the total of eight pKa values from fluorescence spectra and from various regions of UV-Vis spectra. The validated values of (C)Kd (9.1±0.4nM; -log (C)Kd=8.04) and of the absolute (pH-independent) stability constant log βZnL (8.16±0.05) were provided by fluorescence spectroscopy experiments performed at 1μM concentrations. Our experiments demonstrated that both of aminocarboxylate moieties of FluoZin-3 bind the Zn(II) ion synergistically.
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Affiliation(s)
- I Marszałek
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
| | - A Krężel
- Laboratory of Chemical Biology, Faculty of Biotechnology, University of Wroclaw, Joliot-Curie 14a, 50-383 Wroclaw, Poland
| | - W Goch
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
| | - I Zhukov
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland; NanoBioMedical Centre, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
| | - I Paczkowska
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
| | - W Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland.
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Vlasova N, Varentsova A, Shevchenko I, Zhukov I, Remyga S, Gavrilova V, Puzankova O, Shevtsov A, Zinyakov N, Gruzdev K. Comparative Analysis of Clinical and Biological Characteristics of African Swine Fever Virus Isolates from 2013 Year Russian Federation. ACTA ACUST UNITED AC 2015. [DOI: 10.9734/bmrj/2015/12941] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Mur L, Igolkin A, Varentsova A, Pershin A, Remyga S, Shevchenko I, Zhukov I, Sánchez-Vizcaíno JM. Detection of African Swine Fever Antibodies in Experimental and Field Samples from the Russian Federation: Implications for Control. Transbound Emerg Dis 2014; 63:e436-40. [PMID: 25440300 DOI: 10.1111/tbed.12304] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Indexed: 11/29/2022]
Abstract
African swine fever (ASF) re-entered in Europe in 2007 by Georgia rapidly affecting neighbouring countries. Since then, ASF has caused severe problems to the Russian Federation (RF) and spread to Northern and Western regions, including Ukraine (2012 and 2014) and Belarus (2013). At the beginning of 2014, dead wild boars were found in Lithuania and Poland. Several outbreaks have been later notified in the European Union(EU), affecting domestic pigs and wild boar of Latvia, Lithuania and Poland, and also wild boar in Estonia, causing major problems for the EU pig sector. Some studies have been performed with this ASFV isolate, revealing that it belongs to genotype II and causes an acute form of the disease. However, few data are available about the presence of antibodies in field and experimental samples from the affected area. This study analysed samples from experimental infections with ASFV isolated from the RF in 2013 (74 sera and 3 tissue exudates), and field samples from the RF from 2013 to 2014 (266 samples, including 32 and 7 tissue exudates from domestic pigs and wild boar, respectively). All samples were tested by a commercial ELISA and, some of them (79), also by immunochromatographic tests. Positive and doubtful samples were confirmed by immunoblotting test. Positive results were found in experimental and field samples, which confirm the presence of antibodies against ASFV in the RF. Antibodies were detected in animals inoculated with three different ASFV isolates, with some differences found among them. Only a small percentage of field samples was positive for ASF antibodies (3.7%), in agreement with other observations that reported a high virulence for the ASFV isolates in the area. These results confirm the potential presence of survivor animals that should be considered in affected areas to help design effective control and eradication plans against ASF.
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Affiliation(s)
- L Mur
- VISAVET Center and Animal Health Department, Veterinary School, Universidad Complutense de Madrid, Madrid, Spain
| | - A Igolkin
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - A Varentsova
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - A Pershin
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - S Remyga
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - I Shevchenko
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - I Zhukov
- Federal Center for Animal Health FGBI "ARRIAH", Vladimir, Russia
| | - J M Sánchez-Vizcaíno
- VISAVET Center and Animal Health Department, Veterinary School, Universidad Complutense de Madrid, Madrid, Spain
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Poznański J, Zhukov I, Bolewska K, Wierzchowski KL. 1H, 15N, and 13C resonance assignments for the whole region 4 of Escherichia coli RNA polymerase sigma70 subunit. J Biomol NMR 2001; 20:181-182. [PMID: 11495250 DOI: 10.1023/a:1011264217468] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Wójcik J, Ruszczyńska K, Zhukov I, Ejchart A. NMR measurements of proton exchange between solvent and peptides and proteins. Acta Biochim Pol 2000; 46:651-63. [PMID: 10698273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Scope and limitations of the NMR based methods, equilibration and magnetization transfer, for measuring proton exchange rates of amide protons in peptides and proteins with water protons are discussed. Equilibration is applied to very slow processes detected by hydrogen-deuterium exchange after a solute is dissolved in D2O. Magnetization transfer allows to study moderately rapid processes in H2O. A number of precautions should be undertaken in order to avoid systemic errors inherent in the magnetization transfer method.
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Affiliation(s)
- J Wójcik
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa
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Zhukov I, Ejchart A. Factors improving the accuracy of determination of 15N relaxation parameters in proteins. Acta Biochim Pol 2000; 46:665-71. [PMID: 10698274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
A number of factors at all stages of data processing which affect the accuracy of determination of 15N relaxation parameters in 15N-labeled proteins is discussed. Methods which allow to improve accuracy of the determined parameters are presented using data obtained for Cucurbita maxima trypsin inhibitor.
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Affiliation(s)
- I Zhukov
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa
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Waszkowska E, Zarebska Z, Poznański J, Zhukov I. Spectroscopic detection of photoproducts in lecithin model system after 8-methoxypsoralen plus UV-A treatment. J Photochem Photobiol B 2000; 55:145-54. [PMID: 10942079 DOI: 10.1016/s1011-1344(00)00037-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Photoreactions of 8-methoxypsoralen (8-MOP) in the presence of synthetic lecithins esterified at the beta-position with linoleic/oleic and gamma-palmitic acid (PCd2/d1pal) have been studied. Following UV-A (320-400 nm) irradiation, the photoproducts separated by thin-layer chromatography are analysed by UV absorption spectroscopy, nuclear magnetic resonance and mass spectroscopy. The new isolated products are lecithin double cyclobutane adducts, PC-(8-MOP)2, fatty acid-8-MOP split adducts from phosphatidylcholine and lecithin adducts with photo-oxidized 8-MOP. The photolysis performed in the presence of 8-MOP is related to the previously reported lecithin cyclobutane adducts with psoralen. A hypothetical scheme of lecithin photolysis under PUVA (psoralen + UV-A) treatment is proposed. We suggest that photolysis of lecithin may have a significant role in the chain of reactions triggered in cell membrane submitted to PUVA treatment.
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Affiliation(s)
- E Waszkowska
- Institute of Biochemistry and Biophysics PAS, Warsaw, Poland
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Zhukov I, Jaroszewski L, Bierzyński A. Conservative mutation Met8 --> Leu affects the folding process and structural stability of squash trypsin inhibitor CMTI-I. Protein Sci 2000; 9:273-9. [PMID: 10716179 PMCID: PMC2144554 DOI: 10.1110/ps.9.2.273] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Protein molecules can accommodate a large number of mutations without noticeable effects on their stability and folding kinetics. On the other hand, some mutations can have quite strong effects on protein conformational properties. Such mutations either destabilize secondary structures, e.g., alpha-helices, are incompatible with close packing of protein hydrophobic cores, or lead to disruption of some specific interactions such as disulfide cross links, salt bridges, hydrogen bonds, or aromatic-aromatic contacts. The Met8 --> Leu mutation in CMTI-I results in significant destabilization of the protein structure. This effect could hardly be expected since the mutation is highly conservative, and the side chain of residue 8 is situated on the protein surface. We show that the protein destabilization is caused by rearrangement of a hydrophobic cluster formed by side chains of residues 8, Ile6, and Leu17 that leads to partial breaking of a hydrogen bond formed by the amide group of Leu17 with water and to a reduction of a hydrophobic surface buried within the cluster. The mutation perturbs also the protein folding. In aerobic conditions the reduced wild-type protein folds effectively into its native structure, whereas more then 75% of the mutant molecules are trapped in various misfolded species. The main conclusion of this work is that conservative mutations of hydrophobic residues can destabilize a protein structure even if these residues are situated on the protein surface and partially accessible to water. Structural rearrangement of small hydrophobic clusters formed by such residues can lead to local changes in protein hydration, and consequently, can affect considerably protein stability and folding process.
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Affiliation(s)
- I Zhukov
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warszawa, ul. Pawinskiego
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Abstract
A number of factors at all stages of data processing which affect the accuracy of determination of 15N relaxation parameters in 15N-labeled proteins is discussed. Methods which allow to improve accuracy of the determined parameters are presented using data obtained for Cucurbita maxima trypsin inhibitor.
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Abstract
Scope and limitations of the NMR based methods, equilibration and magnetization transfer, for measuring proton exchange rates of amide protons in peptides and proteins with water protons are discussed. Equilibration is applied to very slow processes detected by hydrogen-deuterium exchange after a solute is dissolved in D2O. Magnetization transfer allows to study moderately rapid processes in H2O. A number of precautions should be undertaken in order to avoid systemic errors inherent in the magnetization transfer method.
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