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Limarev IP, Zelinskii GE, Belova SA, Dorovatovskii PV, Vologzhanina AV, Lebed EG, Voloshin YZ. Monoribbed‐functionalized macrobicyclic iron(
II
) complexes decorated with terminal reactive and vector groups: synthetic strategy towards, chemical transformations and structural characterization. CHINESE J CHEM 2022. [DOI: 10.1002/cjoc.202200191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ilya P. Limarev
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova st. 119991 Moscow Russia
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr. 119991 Moscow Russia
| | - Genrikh E. Zelinskii
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova st. 119991 Moscow Russia
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr. 119991 Moscow Russia
| | - Svetlana A. Belova
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova st. 119991 Moscow Russia
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr. 119991 Moscow Russia
| | | | - Anna V. Vologzhanina
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova st. 119991 Moscow Russia
| | - Ekaterina G. Lebed
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova st. 119991 Moscow Russia
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr. 119991 Moscow Russia
| | - Yan Z. Voloshin
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 28 Vavilova st. 119991 Moscow Russia
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 31 Leninsky pr. 119991 Moscow Russia
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Selin RO, Klemt I, Chernii VY, Losytskyy MY, Chernii S, Mular A, Gumienna-Kontecka E, Kovalska VB, Voloshin YZ, Vologzhanina AV, Dorovatovskii PV, Mokhir A. Synthesis and spectral characterization of the first fluorescein-tagged iron(ii) clathrochelates, their supramolecular interactions with globular proteins, and cellular uptake. RSC Adv 2021; 11:8163-8177. [PMID: 35423299 PMCID: PMC8695075 DOI: 10.1039/d0ra10502c] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 02/02/2021] [Indexed: 01/29/2023] Open
Abstract
A fluorescein-tagged iron(ii) cage complex was obtained in a moderate total yield using a two-step synthetic procedure starting from its propargylamine-containing clathrochelate precursor. An 11-fold decrease in fluorescence quantum yield is observed in passing from the given fluorescein-based dye to its clathrochelate derivative. An excitation energy transfer from the terminal fluorescent group of the macrobicyclic molecule to its quasiaromatic highly π-conjugated clathrochelate framework can explain this effect. The kinetics of the hydrolysis of the acetyl groups of acetylated fluorescein azide and its clathrochelate derivative in the presence of one equivalent of BSA evidenced no strong supramolecular host-guest interactions between BSA and the tested compounds. Study of a chemical stability of the deacetylated iron(ii) clathrochelate suggested the formation of a supramolecular 1 : 1 BSA-clathrochelate assembly. Moreover, an addition of BSA or HSA to its solution caused the appearance of strong clathrochelate-based ICD outputs. The fluorescence emission anisotropy studies also evidenced the supramolecular binding of the fluorescein-tagged iron(ii) clathrochelate to the BSA macromolecule, leading to a high increase in this type of anisotropy. Subcellular uptake of the fluorescein-tagged molecules was visualized using fluorescence microscopy and showed its distribution to be mainly in the cytosol without entering the nucleus or accumulating in any other organelle. An X-rayed crystal of the above propargylamide macrobicyclic precursor with a reactive terminal C[triple bond, length as m-dash]C bond contains the clathrochelate molecules of two types, A and B. The encapsulated iron(ii) ion in these molecules is situated in the center of its FeN6-coordination polyhedron, the geometry of which is intermediate between a trigonal prism (TP) and a trigonal antiprism (TAP). The Fe-N distances vary from 1.8754(6) to 1.9286(4) Å and the heights h of their distorted TP-TAP polyhedra are very similar (2.30 and 2.31 Å); their values of φ are equal to 25.3 and 26.6°. In this crystal, the molecules of types A and B participate in different types of hydrogen bonding, giving H-bonded clathrochelate tetramers through their carboxylic and amide groups, respectively; these tetramers are connected to H-bonded chains.
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Affiliation(s)
- Roman O Selin
- Vernadskii Institute of General and Inorganic Chemistry NASU 32/34 Palladin Prosp. 03080 Kiev Ukraine
| | - Insa Klemt
- Organic Chemistry II, Friedrich-Alexander-University of Erlangen-Nuremberg Nikolaus-Fiebiger-Straße 10 91058 Erlangen Germany
| | - Viktor Ya Chernii
- Vernadskii Institute of General and Inorganic Chemistry NASU 32/34 Palladin Prosp. 03080 Kiev Ukraine
| | - Mykhaylo Yu Losytskyy
- Institute of Molecular Biology and Genetics, NASU 150 Zabolotnogo St. 03143 Kyiv Ukraine
| | - Svitlana Chernii
- Institute of Molecular Biology and Genetics, NASU 150 Zabolotnogo St. 03143 Kyiv Ukraine
| | - Andrzej Mular
- Faculty of Chemistry, University of Wroclaw 14 F. Joliot-Curie St. 50-383 Wroclaw Poland
| | | | - Vladyslava B Kovalska
- Institute of Molecular Biology and Genetics, NASU 150 Zabolotnogo St. 03143 Kyiv Ukraine
| | - Yan Z Voloshin
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences 31 Leninsky Prosp. 119991 Moscow Russia
- Nesmeyanov Institute of the Organoelement Compounds of the Russian Academy of Sciences 28 Vavilova St. 119991 Moscow Russia
| | - Anna V Vologzhanina
- Nesmeyanov Institute of the Organoelement Compounds of the Russian Academy of Sciences 28 Vavilova St. 119991 Moscow Russia
| | | | - Andriy Mokhir
- Organic Chemistry II, Friedrich-Alexander-University of Erlangen-Nuremberg Nikolaus-Fiebiger-Straße 10 91058 Erlangen Germany
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3
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New boron-capped cage manganese(II) complex with terminal thiophene-2-carboxaldehyde groups: Crystal structure and density functional theory investigation for electron transfer. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128481] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Kovalska V, Vakarov S, Chornenka N, Gumienna-Kontecka E, Voloshin Y. Sensing of a Protein’s Structure Using the Induced Circular Dichroism Spectra by the Monocarboxyphenylsulfide Iron(II) Clathrochelates as Optical Reporters. RUSS J INORG CHEM+ 2020. [DOI: 10.1134/s0036023620100137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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5
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Kovalska V, Kuperman M, Losytskyy M, Vakarov S, Potocki S, Yarmoluk S, Voloshin Y, Varzatskii O, Gumienna-Kontecka E. Induced CD of iron(ii) clathrochelates: sensing of the structural and conformational alterations of serum albumins. Metallomics 2020; 11:338-348. [PMID: 30516230 DOI: 10.1039/c8mt00278a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
An ability of inherently achiral macrobicyclic metal complexes iron(ii) clathrochelates to acquire an induced CD (ICD) output in the visible spectral range upon interaction with bovine serum albumin (BSA) was recently discovered. In the present work, the CD-reporting properties of iron(ii) clathrochelates to proteins and the thermodynamic parameters of their binding to albumins are evaluated. It is shown that iron(ii) clathrochelates functionalized by six ribbed carboxyphenylsulfide groups are able to discriminate between serum albumins of relative structure (here human and bovine albumins) by giving distinct ICD spectra. Besides, by the variation of the shape and intensity of CD bands, these cage metal complexes reflect the pH-triggered alterations of the tertiary structure of albumins. The constitutional isomerism (ortho-, meta- or para-isomers) of terminal carboxyphenylsulfide groups of iron(ii) clathrochelates strongly affects both the character of their ICD output upon binding with proteins and the parameters of the formed guest-host associates. Using isothermal titration calorimetry, it was determined that cage metal complexes bearing meta- and ortho-isomers of carboxyphenylsulfide groups possess higher association constants (Ka ∼ 2 × 104 M-1) and clathrochelate-to-BSA binding ratios (n = 2) than the para-isomer (Ka ∼ 5 × 103 M-1, n = 1). The iron(ii) clathrochelates are suggested to be potential molecular three-dimensional scaffolds for the design of CD-sensitive reporters able to recognize specific elements of protein surfaces.
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Affiliation(s)
- Vladyslava Kovalska
- Institute of Molecular Biology and Genetics, NASU, 150 Zabolotnogo St., 03143 Kyiv, Ukraine.
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Kovalska V, Vakarov S, Losytskyy M, Kuperman M, Chornenka N, Toporivska Y, Gumienna-Kontecka E, Voloshin Y, Varzatskii O, Mokhir A. Dicarboxyl-terminated iron(ii) clathrochelates as ICD-reporters for globular proteins. RSC Adv 2019; 9:24218-24230. [PMID: 35527894 PMCID: PMC9069836 DOI: 10.1039/c9ra04102h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 07/26/2019] [Indexed: 01/07/2023] Open
Abstract
Cage metal complexes iron(ii) clathrochelates, which are inherently CD silent, were discovered to demonstrate intensive output in induced circular dichroism (ICD) spectra upon their assembly to albumins. With the aim to design clathrochelates as protein-sensitive CD reporters, the approach for the functionalization of one chelate α-dioximate fragment of the clathrochelate framework with two non-equivalent substituents was developed, and constitutional isomers of clathrochelate with two non-equivalent carboxyphenylsulfide groups were synthesized. The interaction of designed iron(ii) clathrochelates and their symmetric homologues with globular proteins (serum albumins, lysozyme, β-lactoglobulin (BLG), trypsin, insulin) was studied by protein fluorescence quenching and CD techniques. A highly-intensive ICD output of the clathrochelates was observed upon their association with albumins and BLG. It was shown that in the presence of BLG, different clathrochelate isomers gave spectra of inverted signs, indicating the stabilization of opposite configurations (Λ or Δ) of the clathrochelate framework in the assembly with this protein. So, we suggest that the isomerism of the terminal carboxy group determined preferable configurations of the clathrochelate framework for the fixation in the protein binding site. MALDI TOF results show the formation of BLG-clathrochelate complex with ratio 1 : 1. Based on the docking simulations, the binding of the clathrochelate molecule (all isomers) to the main BLG binding site (calyx) in its open conformation is suggested. The above results point that the variation of the ribbed substituents at the clathrochelate framework is an effective tool to achieve the specificity of clathrochelate ICD reporting properties to the target protein.
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Affiliation(s)
- Vladyslava Kovalska
- Institute of Molecular Biology and Genetics, NASU 150 Zabolotnogo St. 03143 Kyiv Ukraine
| | - Serhii Vakarov
- Princeton Biomolecular Research Labs 26A Saperne Pole St. 01042 Kyiv Ukraine
- V.I. Vernadsky Institute of General and Inorganic Chemistry, NASU 32/34 Palladin Av. 03142 Kyiv Ukraine
| | - Mykhaylo Losytskyy
- Institute of Molecular Biology and Genetics, NASU 150 Zabolotnogo St. 03143 Kyiv Ukraine
| | - Marina Kuperman
- Institute of Molecular Biology and Genetics, NASU 150 Zabolotnogo St. 03143 Kyiv Ukraine
| | - Nina Chornenka
- Princeton Biomolecular Research Labs 26A Saperne Pole St. 01042 Kyiv Ukraine
- V.I. Vernadsky Institute of General and Inorganic Chemistry, NASU 32/34 Palladin Av. 03142 Kyiv Ukraine
| | - Yuliya Toporivska
- Faculty of Chemistry, University of Wroclaw 14 F. Joliot-Curie St. 50-383 Wroclaw Poland
| | | | - Yan Voloshin
- Nesmeyanov Institute of Organoelement Compounds RAS 28 Vavilova St. 119991 Moscow Russia
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences 31 Leninsky Prosp. 119991 Moscow Russia
| | - Oleg Varzatskii
- V.I. Vernadsky Institute of General and Inorganic Chemistry, NASU 32/34 Palladin Av. 03142 Kyiv Ukraine
| | - Andriy Mokhir
- Organic Chemistry II, Friedrich-Alexander-University of Erlangen-Nuremberg Henkestr. 42 91054 Erlangen Germany
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Bi M, Zhang H, Yuan L, Zhao L, Liu R. Molecular mechanisms of lead-induced changes of selenium status in mice livers through interacting with selenoprotein P. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 175:282-288. [PMID: 30921565 DOI: 10.1016/j.ecoenv.2019.03.059] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 03/12/2019] [Accepted: 03/14/2019] [Indexed: 06/09/2023]
Abstract
As a heavy metal generally considered to be toxic, lead displays the destruction of the antioxidant system and causes oxidative damage through animal, cellular and molecular evidences. Selenium exists in the form of selenocysteine (Sec) upon its incorporation into selenoproteins and plays vital roles in protection from oxidative stress caused by toxic materials such as lead. This study investigated mechanisms of lead-induced changes of selenium status both at the animal and molecular levels. Total selenium concentrations in blood plasma, contents of glutathione peroxidase 3 (Gpx3) and selenoprotein P (SelP) in blood plasma and mRNA levels of key selenoproteins in mice livers were significantly inhibited after lead exposure, and indicators of oxidative damages in mice livers caused by lead also presented significantly higher, including levels of reactive oxygen species, malonaldehyde concentration and TNF-α levels. To further confirm the hypothesis that lead may disturb selenium status through affecting SelP function, we investigated molecular mechanisms of lead on SelP in vitro. Results indicated that lead changed secondary structure of SelP by loosening and destruction its skeleton. This work presents molecular mechanisms changes of selenium status in mice livers caused by lead combined in vivo and in vitro studies, and contributes to a better understanding of lead toxicity on human health.
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Affiliation(s)
- Mengjiao Bi
- School of Environmental Science and Engineering, China-America CRC for Environment & Health, Shandong University, 72# Jimo Binhai Road, Qingdao, Shandong, 266237, PR China
| | - Hao Zhang
- Laboratory of Immunology for Environment and Health, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, China; Hubei Provincial Key Laboratory of Occurrence and Intervention of Rhumatic Diseases, Hubei University for Nationalities, 39 Xueyuan Road, Enshi, China
| | - Lin Yuan
- Hubei Provincial Key Laboratory of Occurrence and Intervention of Rhumatic Diseases, Hubei University for Nationalities, 39 Xueyuan Road, Enshi, China
| | - Lining Zhao
- School of Environmental Science and Engineering, China-America CRC for Environment & Health, Shandong University, 72# Jimo Binhai Road, Qingdao, Shandong, 266237, PR China
| | - Rutao Liu
- School of Environmental Science and Engineering, China-America CRC for Environment & Health, Shandong University, 72# Jimo Binhai Road, Qingdao, Shandong, 266237, PR China.
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Yue Y, Wang Z, Wang Z, Zhang Y, Liu J. A comparative study of binding properties of different coumarin-based compounds with human serum albumin. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.05.060] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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9
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Kovalska VB, Vakarov SV, Kuperman MV, Losytskyy MY, Gumienna-Kontecka E, Voloshin YZ, Varzatskii OA. Induced chirality of cage metal complexes switched by their supramolecular and covalent binding. Dalton Trans 2018; 47:1036-1052. [PMID: 29257161 DOI: 10.1039/c7dt03731g] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An ability of the ribbed-functionalized iron(ii) clathrochelates to induce a CD output in interactions with a protein, covalent bonding or supramolecular interactions with a low-molecular-weight chiral inductor, was discovered. The interactions of CD inactive, carboxyl-terminated iron(ii) clathrochelates with serum albumin induced their molecular asymmetry, causing an appearance of strong CD signals in the range of 350-600 nm, whereas methyl ester and amide clathrochelate derivatives remained almost CD inactive. The CD spectra of carboxyl-terminated clathrochelates on supramolecular interactions or covalent bonding with (R)-(+)-1-phenylethylamine gave a substantially lower CD output than with albumin, affected by both the solvent polarity and the isomerism of clathrochelate's ribbed substituents. In supramolecular assemblies, the bands were most intensive for ortho-substituted carboxyl-terminated clathrochelates. The ortho- and meta-phenylethylamide cage complexes in tetrachloromethane inverted the signs of their CD bands compared with those in acetonitrile. It was suggested that the tris-dioximate metal clathrochelates possess a Russian doll-like molecular system. Because of the distorted TP-TAP geometry, their coordination polyhedron had no inversion centre and possessed an inherent chirality together with the equiprobability of its left(Λ)- and right(Δ)-handle twists. The selective fixation of one of these C3-distorted conformations resulted in the appearance of the CD signal in the range of their visible metal-to-ligand charge transfer bands. Calculations by DFT methods were used to illustrate the possible conformations of the macrobicyclic molecules, as well as the intramolecular interactions between the cage framework and optically active distal substituents responsible for the chirality induction of the metal-centred coordination polyhedra.
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Affiliation(s)
- Vladyslava B Kovalska
- Institute of Molecular Biology and Genetics NASU, 150 Zabolotnogo St., 03143 Kiev, Ukraine and SC Princeton Biomolecular Research Labs, Saperne pole st., 26A, 01042, Kyiv, Ukraine.
| | - Serhii V Vakarov
- Vernadskii Institute of General and Inorganic Chemistry NASU, 32/34 Palladin Av., 03080 Kiev, Ukraine
| | - Marina V Kuperman
- Institute of Molecular Biology and Genetics NASU, 150 Zabolotnogo St., 03143 Kiev, Ukraine
| | - Mykhaylo Y Losytskyy
- Institute of Molecular Biology and Genetics NASU, 150 Zabolotnogo St., 03143 Kiev, Ukraine
| | | | - Yan Z Voloshin
- Nesmeyanov Institute of Organoelement Compounds RAS, 28 Vavilova St., 119991 Moscow, Russia and Kurnakov Institute of General and Inorganic Chemistry RAS, 31 Leninsky Prosp., 119991 Moscow, Russia
| | - Oleg A Varzatskii
- SC Princeton Biomolecular Research Labs, Saperne pole st., 26A, 01042, Kyiv, Ukraine. and Vernadskii Institute of General and Inorganic Chemistry NASU, 32/34 Palladin Av., 03080 Kiev, Ukraine
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Zelinskii GE, Belov AS, Belaya IG, Vologzhanina AV, Novikov VV, Varzatskii OA, Voloshin YZ. The molecular design of cage metal complexes for biological applications: pathways of the synthesis, and X-ray structures of a series of new N2-, S2- and O2-alicyclic iron(ii) di- and tetrachloroclathrochelates. NEW J CHEM 2018. [DOI: 10.1039/c7nj03051g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New iron(ii) di- and tetrahalogenoclathrochelates with apical functionalizing substituents were prepared and characterized.
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Affiliation(s)
- Genrikh E. Zelinskii
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences
- 119991 Moscow
- Russia
| | - Alexander S. Belov
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences
- 119991 Moscow
- Russia
| | - Irina G. Belaya
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences
- 119991 Moscow
- Russia
| | - Anna V. Vologzhanina
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences
- 119991 Moscow
- Russia
| | - Valentin V. Novikov
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences
- 119991 Moscow
- Russia
| | | | - Yan Z. Voloshin
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences
- 119991 Moscow
- Russia
- Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences
- Moscow
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Varzatskii OA, Vakarov SV, Belov AS, Lebed EG, Vologzhanina AV, Voloshin YZ. Synthesis and X-ray structure of methyl esters of the dicarboxyphenylsulfide iron(II) clathrochelates. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1407923] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Oleg A. Varzatskii
- Vernadskii Institute of General and Inorganic Chemistry NASU, Kyiv, Ukraine
- SC Princeton Biomolecular Research Labs, Kyiv, Ukraine
| | - Serhii V. Vakarov
- Vernadskii Institute of General and Inorganic Chemistry NASU, Kyiv, Ukraine
| | | | | | | | - Yan Z. Voloshin
- Nesmeyanov Institute of Organoelement Compounds RAS, Moscow, Russia
- Kurnakov Institute of General and Inorganic Chemistry RAS, Moscow, Russia
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Das A, Basak P, Pattanayak R, Kar T, Majumder R, Pal D, Bhattacharya A, Bhattacharyya M, Banik SP. Trehalose induced structural modulation of Bovine Serum Albumin at ambient temperature. Int J Biol Macromol 2017; 105:645-655. [DOI: 10.1016/j.ijbiomac.2017.07.074] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 07/07/2017] [Accepted: 07/12/2017] [Indexed: 10/19/2022]
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13
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Li T, Hao M, Pan J, Zong W, Liu R. Comparison of the toxicity of the dyes Sudan II and Sudan IV to catalase. J Biochem Mol Toxicol 2017; 31. [DOI: 10.1002/jbt.21943] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 05/23/2017] [Accepted: 05/24/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Tong Li
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health; Jinan 250100 People's Republic of China
| | - Minglu Hao
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health; Jinan 250100 People's Republic of China
| | - Jie Pan
- College of Chemical and Environmental Engineering; Shandong University of Science and Technology; Qingdao 266000 People's Republic of China
| | - Wansong Zong
- College of Population, Resources and Environment; Shandong Normal University; Jinan 250014 People's Republic of China
| | - Rutao Liu
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health; Jinan 250100 People's Republic of China
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Pattanayak R, Basak P, Sen S, Bhattacharyya M. An insight to the binding of ellagic acid with human serum albumin using spectroscopic and isothermal calorimetry studies. Biochem Biophys Rep 2017; 10:88-93. [PMID: 29114572 PMCID: PMC5637241 DOI: 10.1016/j.bbrep.2017.03.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Revised: 02/27/2017] [Accepted: 03/01/2017] [Indexed: 11/27/2022] Open
Abstract
Ellagic acid (EA), a natural polyphenol evidence several pharmacological benefits. The binding profile of EA with human serum albumin (HSA) has been explored and investigated by Isothermal titration calorimetry (ITC), circular dichroism (CD) spectroscopy, time-correlated single-photon counting (TCSPC), absorbance spectroscopy, steady-state fluorescence spectroscopy, and modelling studies. The ITC data analysis revealed the binding Constant (Ka), ΔH, ΔS and ΔG values to be 15.5×104M−1, −116.2±18.1 Kcal mol−1, −366 cal mol−1K−1 and −7.13 Kcal mol−1 respectively with a unique binding site at HSA. EA effectively quenched the intrinsic fluorescence of HSA by static quenching, whereas TCSPC data also revealed association of dynamic quenching also. Thermodynamic analysis confirmed that hydrophobic and mainly hydrogen bonding interaction played important role in stabilizing the HSA-EA complex. It further dictates the binding reaction to be enthalpy driven. The secondary structure of HSA was altered upon binding with EA. CD spectroscopic data indicated the fraction of alpha helicity to be decreased from 52% to 40% upon binding to EA. This study will provide an insight on evaluation of this bioactive interaction during transport and releasing efficiency at the target site in human physiological system since HSA is the most important carrier protein in blood serum. A single state binding mode of Human Serum Albumin with Ellagic Acid is proposed. Fluoresence quenching of HSA with Ellagic acid is validated in this study. Number of binding sites of HSA is characterized using Molecular Docking and ITC study.
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Affiliation(s)
- Rudradip Pattanayak
- Department of Biochemistry, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019, West Bengal, India
| | - Pijush Basak
- Jagadis Bose National Science Talent Search, 1300, Rajdanga Main Road, Sector C, East Kolkata Township, Kolkata 700107, West Bengal, India
| | - Srikanta Sen
- 229A/230, Mira Tower, Lake Town, Block-A, Kolkata 700089, India
| | - Maitree Bhattacharyya
- Department of Biochemistry, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700019, West Bengal, India.,Jagadis Bose National Science Talent Search, 1300, Rajdanga Main Road, Sector C, East Kolkata Township, Kolkata 700107, West Bengal, India
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Basak P, Kundu N, Pattanayak R, Bhattacharyya M. Denaturation properties and folding transition states of leghemoglobin and other heme proteins. BIOCHEMISTRY (MOSCOW) 2015; 80:463-72. [DOI: 10.1134/s0006297915040100] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Dolganov AV, Belov AS, Novikov VV, Vologzhanina AV, Romanenko GV, Budnikova YG, Zelinskii GE, Buzin MI, Voloshin YZ. First iron and cobalt(II) hexabromoclathrochelates: structural, magnetic, redox, and electrocatalytic behavior. Dalton Trans 2015; 44:2476-87. [PMID: 25559125 DOI: 10.1039/c4dt03082f] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Template condensation of dibromoglyoxime with n-butylboronic acid on the corresponding metal ion as a matrix under vigorous reaction conditions afforded iron and cobalt(ii) hexabromoclathrochelates. The paramagnetic cobalt clathrochelate was found to be a low-spin complex at temperatures below 100 K, with a gradual increase in the effective magnetic moment at higher temperatures due to the temperature 1/2↔3/2 spin crossover and a gap caused by the structure phase transition. The multitemperature X-ray and DSC studies of this complex and its iron(ii)-containing analog also showed temperature structural transitions. The variation of an encapsulated metal ion's radius, electronic structure and spin state caused substantial differences in the geometry of its coordination polyhedron; these differences increase with the decrease in temperature due to Jahn-Teller distortion of the encapsulated cobalt(ii) ion with an electronic configuration d(7). As follows from CV and GC data, these cage iron and cobalt complexes undergo both oxidation and reduction quasireversibly, and showed an electrocatalytic activity for hydrogen production in different producing systems.
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Affiliation(s)
- Alexander V Dolganov
- Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 119991 Moscow, Russia.
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Voloshin YZ, Novikov VV, Nelyubina YV. Recent advances in biological applications of cage metal complexes. RSC Adv 2015. [DOI: 10.1039/c5ra10949c] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This review highlights advances in biochemical and medical applications of cage metal complexes (clathrochelates) and related polyhedral compounds.
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Affiliation(s)
- Yan Z. Voloshin
- Nesmeyanov Institute of the Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russia
| | - Valentin V. Novikov
- Nesmeyanov Institute of the Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russia
| | - Yulia V. Nelyubina
- Nesmeyanov Institute of the Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russia
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Basak P, Pattanayak R, Nag S, Bhattacharyya M. pH-induced conformational isomerization of leghemoglobin from Arachis hypogea. BIOCHEMISTRY (MOSCOW) 2014; 79:1255-61. [DOI: 10.1134/s0006297914110133] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Novikov VV, Pavlov AA, Belov AS, Vologzhanina AV, Savitsky A, Voloshin YZ. Transition Ion Strikes Back: Large Magnetic Susceptibility Anisotropy in Cobalt(II) Clathrochelates. J Phys Chem Lett 2014; 5:3799-803. [PMID: 26278750 DOI: 10.1021/jz502011z] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Transition-metal complexes are rarely considered as paramagnetic tags for NMR spectroscopy due to them generally having relatively low magnetic anisotropy. Here we report cobalt(II) cage complexes with the largest (among the transition-metal complexes) axial anisotropy of magnetic susceptibility, reaching as high as 12.6 × 10(-32) m(3) at room temperature. This remarkable anisotropy, which results from an unusual trigonal prismatic geometry of the complexes and translates into large negative value of the zero-field splitting energy, is high enough to promote reliable paramagnetic pseudocontact shifts at the distance beyond 2 nm. Our finding paves the way toward the applications of cobalt(II) clathrochelates as future paramagnetic tags. Given the incredible stability and functionalization versatility of clathrochelates, the fine-tuning of the caging ligand may lead to new chemically stable mononuclear single-molecule magnets, for which magnetic anisotropy is of importance.
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Affiliation(s)
- Valentin V Novikov
- †Nesmeyanov Institute of Organoelement Compounds, RAS, Vavilova str. 28, 119991 Moscow, Russia
| | - Alexander A Pavlov
- †Nesmeyanov Institute of Organoelement Compounds, RAS, Vavilova str. 28, 119991 Moscow, Russia
| | - Alexander S Belov
- †Nesmeyanov Institute of Organoelement Compounds, RAS, Vavilova str. 28, 119991 Moscow, Russia
| | - Anna V Vologzhanina
- †Nesmeyanov Institute of Organoelement Compounds, RAS, Vavilova str. 28, 119991 Moscow, Russia
| | - Anton Savitsky
- ‡Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Yan Z Voloshin
- †Nesmeyanov Institute of Organoelement Compounds, RAS, Vavilova str. 28, 119991 Moscow, Russia
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Varzatskii OA, Shul'ga SV, Belov AS, Novikov VV, Dolganov AV, Vologzhanina AV, Voloshin YZ. Copper(I)- and copper(0)-promoted homocoupling and homocoupling-hydrodehalogenation reactions of dihalogenoclathrochelate precursors for C-C conjugated iron(II) bis-cage complexes. Dalton Trans 2014; 43:17934-48. [PMID: 25056255 DOI: 10.1039/c4dt01557f] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iron(II) dibromo- and diiodoclathrochelates undergo copper(I)-promoted reductive homocoupling in HMPA at 70-80 °C leading to C-C conjugated dibromo- and diiodo-bis-clathrochelates in high yields. Under the same conditions, their dichloroclathrochelate analog does not undergo the same homocoupling reaction, so the target dichloro-bis-cage product was obtained in high yield via dimerization of its heterodihalogenide iodochloromonomacrobicyclic precursor. The use of NMP as a solvent at 120-140 °C gave the mixture of bis-clathrochelates resulting from a tandem homocoupling-hydrodehalogenation reaction: the initial acetonitrile copper(I) solvato-complex at a high temperature underwent re-solvatation and disproportionation leading to Cu(II) ions and nano-copper, which promoted the hydrodehalogenation process even at room temperature. The most probable pathway of this reaction in situ includes hydrodehalogenation of the already formed dihalogeno-bis-clathrochelate via the formation of reduced anion radical intermediates. As a result, chemical transformations of the iron(II) dihalogenoclathrochelates in the presence of an acetonitrile copper(I) solvato-complex were found to depend both on the nature of halogen atoms in their ribbed chelate fragments and on reaction conditions (i.e. solvent and temperature). The C-C conjugated iron(II) dihalogeno-bis-clathrochelates easily undergo nucleophilic substitution with various N,S-nucleophiles giving ribbed-functionalized bis-cage species. These iron(II) complexes were characterized by elemental analysis, MALDI-TOF mass spectrometry, IR, UV-Vis, (1)H and (13)C NMR spectroscopy, and by X-ray diffraction; their electrochemical properties were studied by cyclic voltammetry. The isomeric shift values in (57)Fe Mössbauer spectra of such cage compounds allowed identifying them as low-spin iron(II) complexes, while those of the quadrupole splitting are the evidence for a significant TP distortion of their FeN6-coordination polyhedra. As follows from CV data, the C-C conjugated iron(II) bis-clathrochelates undergo stepwise electrochemical reduction and oxidation giving mixed-valence Fe(II)Fe(I) and Fe(II)Fe(III) bis-cage intermediates.
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Affiliation(s)
- Oleg A Varzatskii
- Vernadskii Institute of General and Inorganic Chemistry NASU, 03680 Kiev, Ukraine
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Study of anti-fibrillogenic activity of iron(II) clathrochelates. Bioorg Med Chem 2014; 22:1883-8. [PMID: 24565971 DOI: 10.1016/j.bmc.2014.01.048] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Revised: 01/23/2014] [Accepted: 01/27/2014] [Indexed: 01/19/2023]
Abstract
The macrocyclic compounds mono- and bis-iron(II) clathrochelates were firstly studied as potential anti-fibrillogenic agents using fluorescent inhibitory assay, atomic force microscopy and flow cytometry. It is shown that presence of the clathrochelates leads to the change in kinetics of insulin fibrillization reaction and reduces the amount of formed fibrils (up to 70%). The nature of ribbed substituent could determine the activity of clathrochelates-the higher inhibitory effect is observed for compounds containing carboxybenzenesulfide groups, while the inhibitory properties only slightly depend on the size of complex species. The mono- and bis-clathrochelate derivatives of meta-mercaptobenzoic acid have close values of IC₅₀ namely 16 ± 2 and 24 ± 5 μM, respectively. The presence of clathrochelates decreases the fibril diameter from 5-12 nm for free insulin fibrils to 3-8 nm for these formed in the clathrochelate presence, it also prevents the lateral aggregation of mature fibrils and formation of superfibrillar clusters. However the addition of clathrochelate results in more heterogeneous (both by size and structure) insulin aggregates population as compared to the free insulin. This way, cage complexes-iron(II) clathrochelates are proposed as efficient agents able to suppress the protein aggregation processes.
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