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Harland JB, Samanta S, Lehnert N. Bacterial nitric oxide reductase (NorBC) models employing click chemistry. J Inorg Biochem 2023; 246:112280. [PMID: 37352656 DOI: 10.1016/j.jinorgbio.2023.112280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 03/01/2023] [Revised: 05/15/2023] [Accepted: 05/30/2023] [Indexed: 06/25/2023]
Abstract
Bacterial NO Reductase (NorBC or cNOR) is a membrane-bound enzyme found in denitrifying bacteria that catalyzes the two-electron reduction of NO to N2O and water. The mechanism by which NorBC operates is highly debated, due to the fact that this enzyme is difficult to work with, and no intermediates of the NO reduction reaction could have been identified so far. The unique active site of NorBC consists of a heme b3/non-heme FeB diiron center. Synthetic model complexes provide the opportunity to obtain insight into possible mechanistic alternatives for this enzyme. In this paper, we present three new synthetic model systems for NorBC, consisting of a tetraphenylporphyrin-derivative clicked to modified BMPA-based ligands (BMPA = bis(methylpyridyl)amine) that model the non-heme site in the enzyme. These complexes have been characterized by EPR, IR and UV-Vis spectroscopy. The reactivity with NO was then investigated, and it was found that the complex with the BMPA-carboxylate ligand as the non-heme component has a very low affinity for NO at the non-heme iron site. If the carboxylate functional group is replaced with a phenolate or pyridine group, reactivity is restored and formation of a diiron dinitrosyl complex was observed. Upon one-electron reduction of the nitrosylated complexes, following the semireduced pathway for NO reduction, formation of dinitrosyl iron complexes (DNICs) was observed in all three cases, but no N2O could be detected.
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Affiliation(s)
- Jill B Harland
- Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, United States
| | - Subhra Samanta
- Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, United States
| | - Nicolai Lehnert
- Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, United States.
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2
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Singh N, Bhatla SC. Heme oxygenase-nitric oxide crosstalk-mediated iron homeostasis in plants under oxidative stress. Free Radic Biol Med 2022; 182:192-205. [PMID: 35247570 DOI: 10.1016/j.freeradbiomed.2022.02.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 02/25/2022] [Accepted: 02/28/2022] [Indexed: 12/22/2022]
Abstract
Plant growth under abiotic stress conditions significantly enhances intracellular generation of reactive oxygen species (ROS). Oxidative status of plant cells is directly affected by the modulation of iron homeostasis. Among mammals and plants, heme oxygenase-1 (HO-1) is a well-known antioxidant enzyme. It catalyzes oxygenation of heme, thereby producing Fe2+, CO and biliverdin as byproducts. The antioxidant potential of HO-1 is primarily due to its catalytic reaction byproducts. Biliverdin and bilirubin possess conjugated π-electrons which escalate the ability of these biomolecules to scavenge free radicals. CO also enhances the ROS scavenging ability of plants cells by upregulating catalase and peroxidase activity. Enhanced expression of HO-1 in plants under oxidative stress accompanies sequestration of iron in specialized iron storage proteins localized in plastids and mitochondria, namely ferritin for Fe3+ storage and frataxin for storage of Fe-S clusters, respectively. Nitric oxide (NO) crosstalks with HO-1 at multiple levels, more so in plants under oxidative stress, in order to maintain intracellular iron status. Formation of dinitrosyl-iron complexes (DNICs) significantly prevents Fenton reaction during oxidative stress. DNICs also release NO upon dissociation in target cells over long distance in plants. They also function as antioxidants against superoxide anions and lipidic free radicals. A number of NO-modulated transcription factors also facilitate iron homeostasis in plant cells. Plants facing oxidative stress exhibit modulation of lateral root formation by HO-1 through NO and auxin-dependent pathways. The present review provides an in-depth analysis of the structure-function relationship of HO-1 in plants and mammals, correlating them with their adaptive mechanisms of survival under stress.
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Affiliation(s)
- Neha Singh
- Department of Botany, Gargi College, University of Delhi, India.
| | - Satish C Bhatla
- Laboratory of Plant Physiology and Biochemistry, Department of Botany, University of Delhi, Delhi, 110007, India.
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3
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Vanin AF, Tronov VA, Borodulin RR. Nitrosonium Cation as a Cytotoxic Component of Dinitrosyl Iron Complexes with Thiol-containing Ligands (based on the Experimental Work on MCF7 Human Breast Cancer Cell Culture). Cell Biochem Biophys 2021; 79:93-102. [PMID: 33492647 PMCID: PMC7829092 DOI: 10.1007/s12013-020-00962-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/07/2020] [Indexed: 12/02/2022]
Abstract
Here we demonstrate that binuclear dinitrosyl iron complexes with thiol-containing ligands (glutathione and mercaptosuccinate, B-DNIC-GSH and B-DNIC-MS, respectively) exert cytotoxic effects on MCF7 human breast cancer cells. We showed that they are mediated by nitrosonium cations released from these complexes (NO+). This finding is supported by the cytotoxic effect of both B-DNICs on MCF7 cells evidenced to retain or was even promoted in the presence of N-Methyl-D-glucamine dithiocarbamate (MGD). MGD recruits an iron nitrosyl group [Fe(NO)] from the iron-dinitrosyl fragment [Fe(NO)2] of B-DNIC-MS forming stable mononitrosyl complexes of iron with MGD and releasing NO+ cations from a [Fe(NO)2] fragment.
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Affiliation(s)
- Anatoly F Vanin
- Semenov Federal Research Centre of Chemical Physics, Russian Academy of Sciences, Moscow, Russia.
- Institute of Regenerative Medicine, Sechenov Medical University, Moscow, Russia.
| | - Viktor A Tronov
- Semenov Federal Research Centre of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Rostislav R Borodulin
- Semenov Federal Research Centre of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
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4
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Vanin AF. What is the Mechanism of Nitric Oxide Conversion into Nitrosonium Ions Ensuring S-Nitrosating Processes in Living Organisms. Cell Biochem Biophys 2019; 77:279-292. [PMID: 31586291 DOI: 10.1007/s12013-019-00886-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 09/12/2019] [Indexed: 12/29/2022]
Abstract
Here, I present the data testifying that the conversion of free radical NO molecules to nitrosonium ions (NO+), which are necessary for the realization of one of NO biological effects (S-nitrosation), may occur in living organisms after binding NO molecules to loosely bound iron (Fe2+ ions) with the subsequent mutual one-electron oxidation-reduction of NO molecules (their disproportionation). Inclusion of thiol-containing substances as iron ligands into this process prevents hydrolysis of NO+ ions bound to iron thus providing the formation of stable dinitrosyl iron complexes (DNIC) with thiol ligands. Such complexes act in living organisms as donors of NO and NO+, providing stabilization and transfer of these agents via the autocrine and paracrine pathways. Without loosely bound iron (labile iron pool) and thiols participating in the DNIC formation, NO functioning as one of universal regulators of diverse metabolic processes would be impossible.
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Affiliation(s)
- Anatoly F Vanin
- N.N. Semenov Federal Research Center of Chemical Physics, Russian Academy of Sciences; Institute for Regenerative Medicine, I.M. Sechenov First Moscow State Medical University, Kosygin Str.4, Moscow, 119991, Russia.
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Solovieva AB, Vanin AF, Shekhter AB, Glagolev NN, Aksenova NA, Mikoyan VD, Kotova SL, Rudenko TG, Fayzullin AL, Timashev PS. Is it possible to combine photodynamic therapy and application of dinitrosyl iron complexes in the wound treatment? Nitric Oxide 2019; 83:24-32. [PMID: 30557618 DOI: 10.1016/j.niox.2018.12.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 11/01/2018] [Accepted: 12/09/2018] [Indexed: 11/18/2022]
Abstract
We have studied the effect of interactions between dinitrosyl iron complexes with thiol-containing ligands (DNIC-TL) and diglucamine salt of chlorine e6 (photoditazine, PD) on the rate of photosensitized oxidation of a model organic substrate - tryptophan - in the presence and absence of an amphiphilic polymer, Pluronic F127, as well as on the DNIC-TL and PD photostability. Using EPR and UV spectroscopy, we determined the rate constants for photodegradation of mono- and dinuclear DNIC-TL and PD, respectively. The presence of the photosensitizer and Pluronic F127 has been shown to have a negligible effect on the rate of photodestruction of mono- and dinuclear DNIC-TL, taking into account the changing DNIC-TL and PD concentrations in the photoexcitation conditions. At the same time, in the DNIC-TL presence, the rate of PD photodestruction increases, however, addition of Pluronic F127 leads to a decrease in the rate constant of PD photodestruction. The latter circumstance creates an opportunity for a simultaneous application of DNIC-TL and photodynamic therapy in the wound treatment without losing the PDT efficiency. Indeed, photodynamic therapy in combination with DNIC-TL facilitated skin wound healing in laboratory rats. As shown by a morphological study, application of the DNIC-TL-PD-F127 complex with the subsequent photoactivation was beneficial in reducing inflammation and stimulating regenerative processes.
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Affiliation(s)
- Anna B Solovieva
- Department of Polymers and Composites, N.N.Semenov Institute of Chemical Physics, RAS, 4 Kosygin St., Moscow, 119991, Russia
| | - Anatoly F Vanin
- Department of Polymers and Composites, N.N.Semenov Institute of Chemical Physics, RAS, 4 Kosygin St., Moscow, 119991, Russia; Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya St., Moscow, 119991, Russia
| | - Anatoly B Shekhter
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya St., Moscow, 119991, Russia
| | - Nikolay N Glagolev
- Department of Polymers and Composites, N.N.Semenov Institute of Chemical Physics, RAS, 4 Kosygin St., Moscow, 119991, Russia
| | - Nadezhda A Aksenova
- Department of Polymers and Composites, N.N.Semenov Institute of Chemical Physics, RAS, 4 Kosygin St., Moscow, 119991, Russia; Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya St., Moscow, 119991, Russia
| | - Vasak D Mikoyan
- Department of Polymers and Composites, N.N.Semenov Institute of Chemical Physics, RAS, 4 Kosygin St., Moscow, 119991, Russia
| | - Svetlana L Kotova
- Department of Polymers and Composites, N.N.Semenov Institute of Chemical Physics, RAS, 4 Kosygin St., Moscow, 119991, Russia; Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya St., Moscow, 119991, Russia.
| | - Tatyana G Rudenko
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya St., Moscow, 119991, Russia
| | - Alexey L Fayzullin
- Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya St., Moscow, 119991, Russia
| | - Peter S Timashev
- Department of Polymers and Composites, N.N.Semenov Institute of Chemical Physics, RAS, 4 Kosygin St., Moscow, 119991, Russia; Institute for Regenerative Medicine, Sechenov University, 8-2 Trubetskaya St., Moscow, 119991, Russia; Institute of Photonic Technologies, Research Center "Crystallography and Photonics", RAS, 2 Pionerskaya st., Troitsk, Moscow, 142190, Russia
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Burgovа EN, Khristidis YI, Kurkov AV, Mikoyan VD, Shekhter AB, Adamyan LV, Timashev PS, Vanin AF. The Inhibiting Effect of Dinitrosyl Iron Complexes with Thiol-containing Ligands on the Growth of Endometrioid Tumours in Rats with Experimental Endometriosis. Cell Biochem Biophys 2019; 77:69-77. [PMID: 30710220 DOI: 10.1007/s12013-019-00865-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 11/19/2018] [Accepted: 01/18/2019] [Indexed: 10/27/2022]
Abstract
The possibility that binuclear dinitrosyl iron complexes with glutathione and cysteine (DNIC-GSН and B-DNIC-Cys) have a strong cytotoxic effect on the growth of endometrioid tumours (EMT) in rats with surgically induced experimental endometriosis established in our previous studies has been supported with experimental data. The increase in the DNIC-GSН or B-DNIC-Cys dose from 10 (in our previous studies) to 20 μmol/kg (after i/p administration to experimental rats) fully suppressed the growth of uterine tissues implanted onto the inner surface of the abdominal wall. At 2 μmol/kg DNIC-GSН, the median value of EMT volume increased from 0 to 15 mm3, while the mean size of EMT-from 55 to 77 mm3 (data from EMT measurements in 10 experimental rats). After treatment of animals with B-DNIC with N-acetyl-L-cysteine (10 μmol/kg) known for its ability to penetrate easily through the cell membrane, the inhibiting effect on EMT growth diminished as could be evidenced from the transformation of ~30% of the implants into large-size EMT. Possible reasons for this phenomenon are discussed.
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Affiliation(s)
- Evgeniya N Burgovа
- N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Yana I Khristidis
- Institute of Regenerative Medicine, I.M. Sechenov University, Moscow, Russia
| | - Aleksandr V Kurkov
- Institute of Regenerative Medicine, I.M. Sechenov University, Moscow, Russia
| | - Vasak D Mikoyan
- N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Anatoly B Shekhter
- Institute of Regenerative Medicine, I.M. Sechenov University, Moscow, Russia
| | - Leila V Adamyan
- Reproductive Medicine and Surgery, Moscow University of Medicine and Dentistry, Moscow, Russia
| | - Peter S Timashev
- Institute of Regenerative Medicine, I.M. Sechenov University, Moscow, Russia
| | - Anatoly F Vanin
- N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia. .,Institute of Regenerative Medicine, I.M. Sechenov University, Moscow, Russia.
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7
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Pisarenko O, Studneva I, Timoshin A, Veselova O. Protective efficacy of dinitrosyl iron complexes with reduced glutathione in cardioplegia and reperfusion. Pflugers Arch 2019; 471:583-593. [PMID: 30613864 DOI: 10.1007/s00424-018-02251-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 12/14/2018] [Accepted: 12/27/2018] [Indexed: 12/21/2022]
Abstract
Disturbed homeostasis of nitric oxide (NO) is one of the causes of myocardial ischemia/reperfusion (I/R) injury during open-heart surgery. This study was designed to explore mechanisms of action of dinitrosyl iron complexes with reduced glutathione ({(GS-)2Fe+(NO+)2}+, DNIC-GS) added to crystalloid cardioplegia or reperfusion solution in isolated working rat hearts. Hearts of male Wistar rats were subjected to cardioplegic arrest by St. Thomas' Hospital cardioplegic solution (STH) and normothermic global ischemia followed by reperfusion. DNIC-GS were used with STH or during early reperfusion. Lactate dehydrogenase (LDH) activity in the coronary effluent and myocardial contents of adenine nucleotides, phosphocreatine, and lactate were determined spectrophotometrically. Reactive oxygen species (ROS) formation in the coronary effluent and myocardial DNIC content was assessed by EPR technique. Cardioplegia or reperfusion with DNIC-GS significantly improved recovery of coronary flow and cardiac function compared with control. Carboxy-[2-(4-carboxyphenyl)-4,4,5,5-tetramethyl-imidozoline-1-oxy-3-oxide] (C-PTIO), a selective NO scavenger, reduced/abolished protective action of DNIC-GS. Enhanced recovery of cardiac function with DNIC-GS reduced LDH release in the coronary effluent, augmented recovery of myocardial energy state, and decreased formation of ROS-generating systems at reperfusion. Beneficial effects of DNIC-GS were related to the transfer of [Fe(NO)2] cores to thiol groups of myocardial proteins to form intracellular DNIC pools. The study concluded that DNIC-GS is a promising adjunct agent for metabolic and antioxidant protection of the heart during cardioplegic arrest and reperfusion.
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Affiliation(s)
- Oleg Pisarenko
- Laboratory for Myocardial Metabolism, National Medical Research Center for Cardiology, 3rd Cherepkovskaya Str., 15A, Moscow, Russian Federation, 121552.
| | - Irina Studneva
- Laboratory for Myocardial Metabolism, National Medical Research Center for Cardiology, 3rd Cherepkovskaya Str., 15A, Moscow, Russian Federation, 121552
| | - Alexander Timoshin
- Laboratory for Myocardial Metabolism, National Medical Research Center for Cardiology, 3rd Cherepkovskaya Str., 15A, Moscow, Russian Federation, 121552
| | - Oksana Veselova
- Laboratory for Myocardial Metabolism, National Medical Research Center for Cardiology, 3rd Cherepkovskaya Str., 15A, Moscow, Russian Federation, 121552
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8
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Vanin AF, Borodulin RR, Mikoyan VD. Dinitrosyl iron complexes with natural thiol-containing ligands in aqueous solutions: Synthesis and some physico-chemical characteristics (A methodological review). Nitric Oxide 2017; 66:1-9. [PMID: 28216238 DOI: 10.1016/j.niox.2017.02.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 12/08/2016] [Revised: 02/08/2017] [Accepted: 02/09/2017] [Indexed: 01/16/2023]
Abstract
Two approaches to the synthesis of dinitrosyl iron complexes (DNIC) with glutathione and l-cysteine in aqueous solutions based on the use of gaseous NO and appropriate S-nitrosothiols, viz., S-nitrosoglutathione (GS-NO) or S-nitrosocysteine (Cys-NO), respectively, are considered. A schematic representation of a vacuum unit for generation and accumulation of gaseous NO purified from the NO2 admixture and its application for obtaining aqueous solutions of DNIC in a Thunberg apparatus is given. To achieve this, a solution of bivalent iron in distilled water is loaded into the upper chamber of the Thunberg apparatus, while the thiol solution in an appropriate buffer (рН 7.4) is loaded into its lower chamber. Further steps, which include degassing, addition of gaseous NO, shaking of both solutions and formation of the Fe2+-thiol mixture, culminate in the synthesis of DNIC. The second approach consists in a stepwise addition of Fe2+ salts and nitrite to aqueous solutions of glutathione or cysteine. In the presence of Fe2+ and after the increase in рН to the physiological level, GS-NO or Cys-NO generated at acid media (pH < 4) are converted into DNIC with glutathione or cysteine. Noteworthy, irrespective of the procedure used for their synthesis DNIC with glutathione manifest much higher stability than DNIC with cysteine. The pattern of spin density distribution in iron-dinitrosyl fragments of DNIC characterized by the d7 electronic configuration of the iron atom and described by the formula Fe+(NO+)2 is unique in that it provides a plausible explanation for the ability of DNIC to generate NO and nitrosonium ions (NO+) and the peculiar characteristics of the EPR signal of their mononuclear form (M-DNIC).
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Affiliation(s)
- Anatoly F Vanin
- N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia; Institute of Regenerative Medicine, I.M. Sechenov First Moscow Medical University, Moscow, Russia.
| | - Rostislav R Borodulin
- N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Vasak D Mikoyan
- N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
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Shumaev KB, Kosmachevskaya OV, Nasybullina EI, Gromov SV, Novikov AA, Topunov AF. New dinitrosyl iron complexes bound with physiologically active dipeptide carnosine. J Biol Inorg Chem 2016; 22:153-160. [PMID: 27878396 DOI: 10.1007/s00775-016-1418-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 06/13/2016] [Accepted: 11/15/2016] [Indexed: 01/08/2023]
Abstract
Dinitrosyl iron complexes (DNICs) are physiological NO derivatives and account for many NO functions in biology. Polyfunctional dipeptide carnosine (beta-alanyl-L-histidine) is considered to be a very promising pharmacological agent. It was shown that in the system containing carnosine, iron ions and Angeli's salt, a new type of DNICs bound with carnosine as ligand {(carnosine)2-Fe-(NO)2}, was formed. We studied how the carbonyl compound methylglyoxal influenced this process. Carnosine-bound DNICs appear to be one of the cell's adaptation mechanisms when the amount of reactive carbonyl compounds increases at hyperglycemia. These complexes can also participate in signal and regulatory ways of NO and can act as protectors at oxidative and carbonyl stress conditions.
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Affiliation(s)
- Konstantin B Shumaev
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Prospect 33, Moscow, 119071, Russian Federation
| | - Olga V Kosmachevskaya
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Prospect 33, Moscow, 119071, Russian Federation
| | - Elvira I Nasybullina
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Prospect 33, Moscow, 119071, Russian Federation
| | - Sergey V Gromov
- National University of Science and Technology MISiS, Moscow, 119049, Russian Federation
| | - Alexander A Novikov
- National University of Science and Technology MISiS, Moscow, 119049, Russian Federation
| | - Alexey F Topunov
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Prospect 33, Moscow, 119071, Russian Federation.
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Mikoyan VD, Burgova EN, Borodulin RR, Vanin AF. The binuclear form of dinitrosyl iron complexes with thiol-containing ligands in animal tissues. Nitric Oxide 2016; 62:1-10. [PMID: 27989818 DOI: 10.1016/j.niox.2016.10.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 09/19/2016] [Accepted: 10/27/2016] [Indexed: 11/18/2022]
Abstract
It has been established that treatment of mice with sodium nitrite, S-nitrosoglutathione and the water-soluble nitroglycerine derivative isosorbide dinitrate (ISDN) as NO donors initiates in vivo synthesis of significant amounts of EPR-silent binuclear dinitrosyl iron complexes (B-DNIC) with thiol-containing ligands in the liver and other tissues of experimental mice. This effect is especially apparent if NO donors are administered to mice simultaneously with the Fe2+-citrate complex. Similar results were obtained in experiments on isolated liver and other mouse tissues treated with gaseous NО in vitro and during stimulation of endogenous NO synthesis in the presence of inducible NO synthase. B-DNIC appeared in mouse tissues after in vitro treatment of tissue samples with an aqueous solution of diethyldithiocarbamate (DETC), which resulted in the transfer of iron-mononitrosyl fragments from B-DNIC to the thiocarbonyl group of DETC and the formation of EPR-detectable mononitrosyl iron complexes (MNIC) with DETC. EPR-Active MNIC with N-methyl-d-glucamine dithiocarbamate (MGD) were synthesized in a similar way. MNIC-MGD were also formed in the reaction of water-soluble MGD-Fe2+ complexes with sodium nitrite, S-nitrosoglutathione and ISDN.
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Affiliation(s)
- Vasak D Mikoyan
- N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Evgeniya N Burgova
- N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Rostislav R Borodulin
- N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Anatoly F Vanin
- N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia; Institute for Regenerative Medicine, I.M.Sechenov Moscow State Medical University, Moscow, Russia.
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11
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Borodulin RR, Dereven'kov IА, Burbaev DS, Makarov SV, Mikoyan VD, Serezhenkov VА, Kubrina LN, Ivanovic-Burmazovic I, Vanin AF. Redox activities of mono- and binuclear forms of low-molecular and protein-bound dinitrosyl iron complexes with thiol-containing ligands. Nitric Oxide 2014; 40:100-9. [PMID: 24997418 DOI: 10.1016/j.niox.2014.06.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [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: 02/12/2014] [Revised: 06/05/2014] [Accepted: 06/12/2014] [Indexed: 10/25/2022]
Abstract
EPR, optical, electrochemical and stopped-flow methods were used to demonstrate that Fe(NO)2 fragments in paramagnetic mononuclear and diamagnetic binuclear forms of dinitrosyl iron complexes with glutathione are reversibly reduced by a two-electron mechanism to be further transformed from the initial state with d(7) configuration into states with the d(8) and d(9) electronic configurations of the iron atom. Under these conditions, both forms of DNIC display identical optical and EPR characteristics in state d(9) suggesting that reduction of the binuclear form of DNIC initiates their reversible decomposition into two mononuclear dinitrosyl iron fragments, one of which is EPR-silent (d(8)) and the other one is EPR-active (d(9)). Both forms of DNIC produce EPR signals with the following values of the g-factor: g⊥=2.01, g||=1.97, gaver.=2.0. M-DNIC with glutathione manifest an ability to pass into state d(9), however, only in solutions with a low content of free glutathione. Similar transitions were established for protein-bound М- and B-DNIC with thiol-containing ligands.
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Affiliation(s)
- Rostislav R Borodulin
- N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Ilia А Dereven'kov
- Ivanovo State University of Chemistry and Technology, Ivanovo, Russia; Department of Chemistry and Pharmacy, University of Erlangen-Nürnberg, Germany
| | - Dosymzhan Sh Burbaev
- N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | - Sergei V Makarov
- Ivanovo State University of Chemistry and Technology, Ivanovo, Russia
| | - Vasak D Mikoyan
- N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | | | - Lyudmila N Kubrina
- N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia
| | | | - Anatoly F Vanin
- N.N.Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia.
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12
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Borodulin RR, Kubrina LN, Serezhenkov VA, Burbaev DS, Mikoyan VD, Vanin AF. Redox conversions of dinitrosyl iron complexes with natural thiol-containing ligands. Nitric Oxide 2013; 35:35-41. [PMID: 23876349 DOI: 10.1016/j.niox.2013.07.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [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: 06/05/2013] [Revised: 07/10/2013] [Accepted: 07/14/2013] [Indexed: 10/26/2022]
Abstract
Using the electron paramagnetic resonance (EPR) and optical spectrophotometric methods, it has been established that biologically active, water-soluble dinitrosyl iron complexes (DNIC) with glutathione are predominantly represented by the diamagnetic binuclear form (B-DNIC) even in the presence of a 10-fold excess of glutathione non-incorporated into DNIC at neutral pH. With the increase in рН to 10-11, B-DNIC are fully converted into the paramagnetic mononuclear form (М-DNIC) with a characteristic EPR signal at g⊥=2.04, g‖=2.014 and gaver.=2.03. After treatment with a strong reducing agent sodium dithionite, both М- and B-DNIC are converted into the paramagnetic form with a characteristic EPR signal at g⊥=2.01, g‖=1.97 and gaver.=2.0. Both forms display similar absorption spectra with absorption bands at 960 and 640nm and a bend at 450nm. After oxidation by atmospheric oxygen, this situation is reversed, which manifests itself in the disappearance of the EPR signal at gaver.=2.0 and complete regeneration of initial absorption spectra of М- or B-DNIC with characteristic absorption bands at 390 or 360 and 310nm, respectively. Treatment of bovine serum albumin (BSA) solutions with gaseous NO in the presence of Fe(2+) and cysteine yields BSA-bound М-DNIC (М-DNIC-BSA). After treatment with sodium dithionite, the latter undergo transformations similar to those established for low-molecular М-DNIC with glutathione. Based on the complete coincidence of the optical and the EPR characteristics of sodium dithionite-treated М- and B-DNIC and other findings, it is suggested that sodium dithionite-reduced B-DNIC are subject to reversible decomposition into М-DNIC. The reduction and subsequent oxidation of М- and B-DNIC are interpreted in the paradigm of the current concepts of the initial electronic configurations of М- and B-DNIC (d(7) ({Fe(NO)2}(7)) and d(7)-d(7) ({Fe(NO)2}(7)-{Fe(NO)2}(7)), respectively).
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