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Nguyen A, Deshayes S, Nowoczyn M, Imbard A, Mansour‐Hendili L, Cesbron A, Benoist JF, Schiff M. Late-onset refractory hemolytic anemia in siblings treated for methionine synthase reductase deficiency: A rare complication possibly prevented by hydroxocobalamin dose escalation? JIMD Rep 2024; 65:163-170. [PMID: 38736634 PMCID: PMC11078714 DOI: 10.1002/jmd2.12422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 03/24/2024] [Accepted: 03/28/2024] [Indexed: 05/14/2024] Open
Abstract
Methionine synthase reductase deficiency (cblE) is a rare autosomal recessive inborn error of cobalamin metabolism caused by pathogenic variants in the methionine synthase reductase gene (MTRR). Patients usually exhibit early-onset bone marrow failure with pancytopenia including megaloblastic anemia. The latter can remain isolated or patients may present developmental delay and rarely macular dysfunction. Treatment mostly includes parenteral hydroxocobalamin to maximize the residual enzyme function and betaine to increase methionine concentrations and decrease homocysteine accumulation. We report herein 2 cblE siblings diagnosed in the neonatal period with isolated pancytopenia who, despite treatment, exhibited in adulthood hemolytic anemia (LDH >11 000 U/L, undetectable haptoglobin, elevated unconjugated bilirubin) which could finally be successfully treated by hydroxocobalamin dose escalation. There was no obvious trigger apart from a parvovirus B19 infection in one of the patients. This is the first report of such complications in adulthood. The use of LDH for disease monitoring could possibly be an additional useful biomarker to adjust hydroxocobalamin dosage. Bone marrow infection with parvovirus B19 can complicate this genetic disease with erythroblastopenia even in the absence of an immunocompromised status, as in other congenital hemolytic anemias. The observation of novel hemolytic features in this rare disease should raise awareness about specific complications in remethylation disorders and plea for hydroxocobalamin dose escalation.
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Affiliation(s)
- Alexandre Nguyen
- Department of Internal Medicine and Clinical ImmunologyNormandie Univ, UNICAEN, CHU Caen NormandieCaenFrance
| | - Samuel Deshayes
- Department of Internal Medicine and Clinical ImmunologyNormandie Univ, UNICAEN, CHU Caen NormandieCaenFrance
| | | | - Apolline Imbard
- Biochemistry LaboratoryNecker University Hospital, APHPParisFrance
- Département Médicaments et Technologies Pour la Santé (DMTS)Université Paris‐Saclay, CEA, INRAE, MetaboHUBGif‐sur‐YvetteFrance
| | | | | | - Jean François Benoist
- Biochemistry LaboratoryNecker University Hospital, APHPParisFrance
- Département Médicaments et Technologies Pour la Santé (DMTS)Université Paris‐Saclay, CEA, INRAE, MetaboHUBGif‐sur‐YvetteFrance
| | - Manuel Schiff
- Reference Center for Inherited Metabolic DiseasesNecker University Hospital, APHP and University of Paris CitéParisFrance
- INSERM UMRS_1163, Institut ImagineParisFrance
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2
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Marques HM. The inorganic chemistry of the cobalt corrinoids - an update. J Inorg Biochem 2023; 242:112154. [PMID: 36871417 DOI: 10.1016/j.jinorgbio.2023.112154] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Revised: 01/23/2023] [Accepted: 01/26/2023] [Indexed: 02/05/2023]
Abstract
The inorganic chemistry of the cobalt corrinoids, derivatives of vitamin B12, is reviewed, with particular emphasis on equilibrium constants for, and kinetics of, their axial ligand substitution reactions. The role the corrin ligand plays in controlling and modifying the properties of the metal ion is emphasised. Other aspects of the chemistry of these compounds, including their structure, corrinoid complexes with metals other than cobalt, the redox chemistry of the cobalt corrinoids and their chemical redox reactions, and their photochemistry are discussed. Their role as catalysts in non-biological reactions and aspects of their organometallic chemistry are briefly mentioned. Particular mention is made of the role that computational methods - and especially DFT calculations - have played in developing our understanding of the inorganic chemistry of these compounds. A brief overview of the biological chemistry of the B12-dependent enzymes is also given for the reader's convenience.
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Affiliation(s)
- Helder M Marques
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg 2050, South Africa.
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Mascarenhas R, Li Z, Gherasim C, Ruetz M, Banerjee R. The human B 12 trafficking protein CblC processes nitrocobalamin. J Biol Chem 2020; 295:9630-9640. [PMID: 32457044 DOI: 10.1074/jbc.ra120.014094] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/22/2020] [Indexed: 01/12/2023] Open
Abstract
In humans, cobalamin or vitamin B12 is delivered to two target enzymes via a complex intracellular trafficking pathway comprising transporters and chaperones. CblC (or MMACHC) is a processing chaperone that catalyzes an early step in this trafficking pathway. CblC removes the upper axial ligand of cobalamin derivatives, forming an intermediate in the pathway that is subsequently converted to the active cofactor derivatives. Mutations in the cblC gene lead to methylmalonic aciduria and homocystinuria. Here, we report that nitrosylcobalamin (NOCbl), which was developed as an antiproliferative reagent, and is purported to cause cell death by virtue of releasing nitric oxide, is highly unstable in air and is rapidly oxidized to nitrocobalamin (NO2Cbl). We demonstrate that CblC catalyzes the GSH-dependent denitration of NO2Cbl forming 5-coordinate cob(II)alamin, which had one of two fates. It could be oxidized to aquo-cob(III)alamin or enter a futile thiol oxidase cycle forming GSH disulfide. Arg-161 in the active site of CblC suppressed the NO2Cbl-dependent thiol oxidase activity, whereas the disease-associated R161G variant stabilized cob(II)alamin and promoted futile cycling. We also report that CblC exhibits nitrite reductase activity, converting cob(I)alamin and nitrite to NOCbl. Finally, the denitration activity of CblC supported cell proliferation in the presence of NO2Cbl, which can serve as a cobalamin source. The newly described nitrite reductase and denitration activities of CblC extend its catalytic versatility, adding to its known decyanation and dealkylation activities. In summary, upon exposure to air, NOCbl is rapidly converted to NO2Cbl, which is a substrate for the B12 trafficking enzyme CblC.
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Affiliation(s)
- Romila Mascarenhas
- Department of Biological Chemistry, University of Michigan Medical Center, Ann Arbor, Michigan, USA
| | - Zhu Li
- Department of Biological Chemistry, University of Michigan Medical Center, Ann Arbor, Michigan, USA
| | - Carmen Gherasim
- Department of Pathology, University of Michigan Medical Center, Ann Arbor, Michigan, USA
| | - Markus Ruetz
- Department of Biological Chemistry, University of Michigan Medical Center, Ann Arbor, Michigan, USA
| | - Ruma Banerjee
- Department of Biological Chemistry, University of Michigan Medical Center, Ann Arbor, Michigan, USA
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Polaczek J, Orzeł Ł, Stochel G, van Eldik R. Can nitrocobalamin be reduced by ascorbic acid to nitroxylcobalamin? Some surprising mechanistic findings. J Biol Inorg Chem 2018; 23:377-383. [PMID: 29435646 PMCID: PMC5940710 DOI: 10.1007/s00775-018-1540-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 02/01/2018] [Indexed: 10/29/2022]
Abstract
Despite detailed studies on nitroxylcobalamin (CblNO) formation, the possible intracellular generation of CblNO via reduction of nitrocobalamin (CblNO2) remains questionable. To study this further, spectroscopic studies on the reaction of CblNO2 with the intracellular antioxidant ascorbic acid (HAsc-) were performed in aqueous solution at pH < 5.0. It was found that nitroxylcobalamin is the final product of this interaction, which is not just a simple reaction but a rather complex chemical process. We clearly show that an excess of nitrite suppresses the formation of CblNO, from which it follows that ascorbic acid cannot reduce coordinated nitrite. We propose that under the influence of ascorbic acid, nitrocobalamin is reduced to Cbl(II) and nitric oxide (·NO), which can subsequently react rapidly to form CblNO. It was further shown that this system requires anaerobic conditions as a result of the rapid oxidation of both Cbl(II) and CblNO.
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Affiliation(s)
- Justyna Polaczek
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Łukasz Orzeł
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Grażyna Stochel
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Rudi van Eldik
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland.
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Egerlandstrasse 1, 91058, Erlangen, Germany.
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Dereven'kov IA, Ivlev PA, Bischin C, Salnikov DS, Silaghi-Dumitrescu R, Makarov SV, Koifman OI. Comparative studies of reaction of cobalamin (II) and cobinamide (II) with sulfur dioxide. J Biol Inorg Chem 2017; 22:969-975. [PMID: 28620693 DOI: 10.1007/s00775-017-1474-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2017] [Accepted: 06/07/2017] [Indexed: 12/20/2022]
Abstract
The kinetics of reactions of cobalamin (II) and cobinamide (II) with sulfur dioxide was studied by UV-visible (UV-vis) spectroscopy. Reaction results in oxidation of Co(II) center and involves two aquated SO2 moieties. The final product is suggested to be complex Co(III)-S2O 4•- . The absence of corrin ring modifications during the reactions was proved.
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Affiliation(s)
- Ilia A Dereven'kov
- Institute of Macroheterocyclic Compounds, Ivanovo State University of Chemistry and Technology, Sheremetevskiy str. 7, 153000, Ivanovo, Russia
| | - Pavel A Ivlev
- Institute of Macroheterocyclic Compounds, Ivanovo State University of Chemistry and Technology, Sheremetevskiy str. 7, 153000, Ivanovo, Russia
| | - Cristina Bischin
- Department of Chemistry and Chemical Engineering, "Babes-Bolyai" University, Str. Arany Janos Nr. 11, 400028, Cluj-Napoca, Romania
| | - Denis S Salnikov
- Institute of Macroheterocyclic Compounds, Ivanovo State University of Chemistry and Technology, Sheremetevskiy str. 7, 153000, Ivanovo, Russia.
| | - Radu Silaghi-Dumitrescu
- Department of Chemistry and Chemical Engineering, "Babes-Bolyai" University, Str. Arany Janos Nr. 11, 400028, Cluj-Napoca, Romania
| | - Sergei V Makarov
- Institute of Macroheterocyclic Compounds, Ivanovo State University of Chemistry and Technology, Sheremetevskiy str. 7, 153000, Ivanovo, Russia
| | - Oscar I Koifman
- Institute of Macroheterocyclic Compounds, Ivanovo State University of Chemistry and Technology, Sheremetevskiy str. 7, 153000, Ivanovo, Russia
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6
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Electronic and structural properties of Cob(I)alamin: Ramifications for B 12 -dependent processes. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2016.11.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Subedi H, Brasch NE. Mechanistic studies of the reactions of the reduced vitamin B12 derivatives with the HNO donor Piloty's acid: further evidence for oxidation of cob(I)alamin by (H)NO. Dalton Trans 2016; 45:352-60. [PMID: 26618754 DOI: 10.1039/c5dt03459k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
There is accumulating evidence for the existence of HNO in biological systems. Compared with NO (˙NO), much less is known about the chemical and biochemical reactivity of HNO. Kinetic and mechanistic studies have been carried out on the reaction between the vitamin B12-derived radical complex cob(II)alamin (Cbl(II)˙, Cbl(II)) with the widely used HNO donor Piloty's acid (PA). A stoichiometry of 1 : 2 Cbl(II) : PA was obtained and PA decomposition to HNO and benzenesulfinate (C6H5SO2(-)) is the rate-determining step. No evidence was found for nitrite (Griess assay), ammonia (Nessler's test) or NH2OH (indooxine test) in the product solution, and it is likely that HNO is instead reduced to N2. A mechanism is proposed in which reduction of Cbl(II) by (H)NO results in formation of cob(I)alamin (Cbl(I)(-)) and ˙NO. The Cbl(I)(-) intermediate is subsequently oxidized back to Cbl(II) by a second (H)NO molecule, and Cbl(II) reacts rapidly with ˙NO to form nitroxylcobalamin (NOCbl). Separate studies on the reaction between Cbl(I)(-) and PA shows that this system involves an additional step in which Cbl(I)(-) is first oxidized by (H)NO to Cbl(II), which reacts further with (H)NO to form NOCbl, with an overall stoichiometry of 1 : 3 Cbl(I)(-) : PA. Experiments in the presence of nitrite for both systems support the involvement of a Cbl(I)(-) intermediate in the Cbl(II)/PA reaction. These systems provide the second example of oxidation of cob(I)alamin by (H)NO.
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Affiliation(s)
- Harishchandra Subedi
- Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242, USA and Division of Science, Mathematics, and Physical Education, Western Nebraska Community College, Scottsbluff, Nebraska 69361, USA
| | - Nicola E Brasch
- School of Applied Sciences, Auckland University of Technology, Private Bag 92006, Auckland 1142, New Zealand.
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Subedi H, Brasch NE. Studies on the Reaction of Reduced Vitamin B12Derivatives with the Nitrosyl Hydride (HNO) Donor Angeli's Salt: HNO Oxidizes the Transition-Metal Center of Cob(I)alamin. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500442] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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10
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Salnikov DS, Makarov SV, van Eldik R, Kucherenko PN, Boss GR. Kinetics and mechanism of the reaction of hydrogen sulfide with diaquacobinamide in aqueous solution. Eur J Inorg Chem 2014; 2014:4123-4133. [PMID: 25580081 PMCID: PMC4286256 DOI: 10.1002/ejic.201402082] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Indexed: 11/09/2022]
Abstract
We conducted a detailed kinetic study of the reaction of the vitamin B12 analog diaquacobinamide ((H2O)2Cbi(III)) with hydrogen sulfide in water from pH 3 to 11. The reaction proceeds in three steps: (i) formation of three different complexes between cobinamide and hydrogen sulfide, viz. (HO-)(HS-)Cbi(III), (H2O)(HS-)Cbi(III), and (HS-)2Cbi(III); (ii) inner-sphere electron transfer (ISET) in the two complexes with one coordinated HS- to form the reduced cobinamide complex [(H)S]Cbi(II); and (iii) addition of a second molecule of hydrogen sulfide to the reduced cobinamide. ISET does not proceed in the (HS-)2Cbi(III) complex. The final products of the reaction between cobinamide and hydrogen sulfide were found to be independent of pH, with the main product being a complex of cobinamide(II) with the anion-radical SSH2-.
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Affiliation(s)
- Denis S. Salnikov
- Department of Food Chemistry, Ivanovo State University of Chemistry and Technology, Sheremetevskiy str. 7, 153000 Ivanovo, Russia
- Department of Chemistry and Pharmacy, University of Erlangen – Nuremberg, Egerland strasse 1, 91058 Erlangen, Germany
| | - Sergei V. Makarov
- Department of Food Chemistry, Ivanovo State University of Chemistry and Technology, Sheremetevskiy str. 7, 153000 Ivanovo, Russia
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen – Nuremberg, Egerland strasse 1, 91058 Erlangen, Germany
| | - Polina N. Kucherenko
- Department of Food Chemistry, Ivanovo State University of Chemistry and Technology, Sheremetevskiy str. 7, 153000 Ivanovo, Russia
| | - Gerry R. Boss
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093-0652, United States
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Surducan M, Makarov SV, Silaghi-Dumitrescu R. Redox and linkage isomerism with ligands relevant to oxidative and nitrosative stress in cobalamin. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.03.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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Dereven'kov IA, Salnikov DS, Makarov SV, Boss GR, Koifman OI. Kinetics and mechanism of oxidation of super-reduced cobalamin and cobinamide species by thiosulfate, sulfite and dithionite. Dalton Trans 2014; 42:15307-16. [PMID: 23999614 DOI: 10.1039/c3dt51714d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
We studied the kinetics of reactions of cob(I)alamin and cob(I)inamide with thiosulfate, sulfite, and dithionite by UV-Visible (UV-Vis) and stopped-flow spectroscopy. We found that the two Co(I) species were oxidized by these sulfur-containing compounds to Co(II) forms: oxidation by excess thiosulfate leads to penta-coordinate complexes and oxidation by excess sulfite or dithionite leads to hexa-coordinate Co(II)-SO2(-) complexes. The net scheme involves transfer of three electrons in the case of oxidation by thiosulfate and one electron for oxidation by sulfite and dithionite. On the basis of kinetic data, the nature of the reactive oxidants was suggested, i.e., HS2O3(-) (for oxidation by thiosulfate), S2O5(2-), HSO3(-), and aquated SO2 (for oxidation by sulfite), and S2O4(2-) and SO2(-) (for oxidation by dithionite). No difference was observed in kinetics with cob(i)alamin or cob(i)inamide as reductants.
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Affiliation(s)
- Ilia A Dereven'kov
- State University of Chemistry and Technology, Sheremetevskiy str. 7, 153000 Ivanovo, Russia.
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Salnikov DS, Kucherenko PN, Dereven'kov IA, Makarov SV, van Eldik R. Kinetics and Mechanism of the Reaction of Hydrogen Sulfide with Cobalamin in Aqueous Solution. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201301340] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Biphasic modulation of NOS expression, protein and nitrite products by hydroxocobalamin underlies its protective effect in endotoxemic shock: downstream regulation of COX-2, IL-1β, TNF-α, IL-6, and HMGB1 expression. Mediators Inflamm 2013; 2013:741804. [PMID: 23781123 PMCID: PMC3679756 DOI: 10.1155/2013/741804] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 02/19/2013] [Accepted: 02/19/2013] [Indexed: 12/21/2022] Open
Abstract
Background. NOS/•NO inhibitors are potential therapeutics for sepsis, yet they increase clinical mortality. However, there has been no in vivo investigation of the (in vitro) •NO scavenger, cobalamin's (Cbl) endogenous effects on NOS/•NO/inflammatory mediators during the immune response to sepsis. Methods. We used quantitative polymerase chain reaction (qPCR), ELISA, Western blot, and NOS Griess assays, in a C57BL/6 mouse, acute endotoxaemia model. Results. During the immune response, pro-inflammatory phase, parenteral hydroxocobalamin (HOCbl) treatment partially inhibits hepatic, but not lung, iNOS mRNA and promotes lung eNOS mRNA, but attenuates the LPS hepatic rise in eNOS mRNA, whilst paradoxically promoting high iNOS/eNOS protein translation, but relatively moderate •NO production. HOCbl/NOS/•NO regulation is reciprocally associated with lower 4 h expression of TNF-α, IL-1β, COX-2, and lower circulating TNF-α, but not IL-6. In resolution, 24 h after LPS, HOCbl completely abrogates a major late mediator of sepsis mortality, high mobility group box 1 (HMGB1) mRNA, inhibits iNOS mRNA, and attenuates LPS-induced hepatic inhibition of eNOS mRNA, whilst showing increased, but still moderate, NOS activity, relative to LPS only. experiments (LPS+D-Galactosamine) HOCbl afforded significant, dose-dependent protection in
mice Conclusions. HOCbl produces a complex, time- and organ-dependent, selective regulation of NOS/•NO during endotoxaemia, corollary regulation of downstream inflammatory mediators, and increased survival. This merits clinical evaluation.
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Plymale NT, Dassanayake RS, Hassanin HA, Brasch NE. Kinetic and Mechanistic Studies on the Reactions of the Reduced Vitamin B12 Complex Cob(I)alamin with Nitrite and Nitrate. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100992] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Mukherjee R, Brasch NE. Kinetic studies on the reaction between cob(I)alamin and peroxynitrite: rapid oxidation of cob(I)alamin to cob(II)alamin by peroxynitrous acid. Chemistry 2011; 17:11723-7. [PMID: 21922587 DOI: 10.1002/chem.201102267] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Indexed: 11/06/2022]
Affiliation(s)
- Riya Mukherjee
- Department of Chemistry & Biochemistry and School of Biomedical Sciences, Kent State University, Kent, OH 44242, USA
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Hassanin HA, Hannibal L, Jacobsen DW, Brown KL, Marques HM, Brasch NE. NMR spectroscopy and molecular modelling studies of nitrosylcobalamin: further evidence that the deprotonated, base-off form is important for nitrosylcobalamin in solution. Dalton Trans 2009:424-33. [PMID: 19122899 PMCID: PMC2754767 DOI: 10.1039/b810895a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structure of nitrosylcobalamin (NOCbl) in solution has been studied by NMR spectroscopy and the 1H and 13C NMR spectra have been assigned. 13C and 31P NMR chemical shifts, the UV-vis spectrum of NOCbl and the observed pKbase-off value of approximately 5.1 for NOCbl provide evidence that a significant fraction of NOCbl is present in the base-off, 5,6-dimethylbenzimidazole (DMB) deprotonated, form in solution. NOE-restrained molecular mechanics modelling of base-on NOCbl gave annealed structures with minor conformational differences in the flexible side chains and the nucleotide loop position compared with the X-ray structure. A molecular dynamics simulation at 300 K showed that DMB remains in close proximity to the alpha face of the corrin in the base-off form of NOCbl. Simulated annealing calculations produced two major conformations of base-off NOCbl. In the first, the DMB is perpendicular to the corrin and its B3 nitrogen is about 3.1 A away from and pointing directly at the metal ion; in the second the DMB is parallel to and tucked beneath the D ring of the corrin.
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Affiliation(s)
- Hanaa A. Hassanin
- Department of Chemistry, School of Biomedical Sciences, Kent State University, Kent, OH44242
| | - Luciana Hannibal
- Department of Chemistry, School of Biomedical Sciences, Kent State University, Kent, OH44242
- School of Biomedical Sciences, Kent State University, Kent, OH 44242. E-mail:
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195
| | - Donald W. Jacobsen
- School of Biomedical Sciences, Kent State University, Kent, OH 44242. E-mail:
- Department of Cell Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195
- Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH 44106
| | - Kenneth L. Brown
- Department of Chemistry and Biochemistry, Ohio University, Athens, OH 45701
| | - Helder M. Marques
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO Wits, Johannesburg, 2050, South Africa. E-mail:
| | - Nicola E. Brasch
- Department of Chemistry, School of Biomedical Sciences, Kent State University, Kent, OH44242
- School of Biomedical Sciences, Kent State University, Kent, OH 44242. E-mail:
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Bambagioni V, Bani D, Bencini A, Biver T, Cantore M, Chelli R, Cinci L, Failli P, Ghezzi L, Giorgi C, Nappini S, Secco F, Tinè MR, Valtancoli B, Venturini M. Polyamine−Polycarboxylate Metal Complexes with Different Biological Effectiveness as Nitric Oxide Scavengers. Clues for Drug Design. J Med Chem 2008; 51:3250-60. [DOI: 10.1021/jm701553u] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Valentina Bambagioni
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Daniele Bani
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Andrea Bencini
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Tarita Biver
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Miriam Cantore
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Riccardo Chelli
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Lorenzo Cinci
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Paola Failli
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Lisa Ghezzi
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Claudia Giorgi
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Silvia Nappini
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Fernando Secco
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Maria Rosaria Tinè
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Barbara Valtancoli
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
| | - Marcella Venturini
- Department of Chemistry, University of Florence, Via della Lastruccia 3, Sesto Fiorentino, Florence, Italy, Department of Anatomy, Histology and Forensic Medicine, Section of Histology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy, Department of Chemistry and Industrial Chemistry, University of Pisa, Via Risorgimento 35, Pisa, Italy, and Department of Preclinical and Clinical Pharmacology, University of Florence, V. le G. Pieraccini, 6, Florence, Italy
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Wheatley C. Cobalamin in inflammation III - glutathionylcobalamin and methylcobalamin/adenosylcobalamin coenzymes: the sword in the stone? How cobalamin may directly regulate the nitric oxide synthases. ACTA ACUST UNITED AC 2008; 16:212-226. [PMID: 18923642 PMCID: PMC2556188 DOI: 10.1080/13590840701791863] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Several mysteries surround the structure and function of the nitric oxide synthases (NOS). The NOS oxygenase domain structure is unusually open with a large area of solvent that could accommodate an unidentified ligand. The exact mechanism of the two-step five-electron monoxygenation of arginine to N(G)-hydroxy-L-arginine, thence to citrulline and nitric oxide (NO), is not clear, particularly as arginine/N(G)-hydroxy-L-arginine is bound at a great distance to the supposed catalytic heme Fe [III], as the anti-stereoisomer. The Return of the Scarlet Pimpernel Paper proposed that cobalamin is a primary indirect regulator of the NOS. An additional direct regulatory effect of the 'base-off' dimethylbenzimidazole of glutathionylcobalamin (GSCbl), which may act as a sixth ligand to the heme iron, promote Co-oriented, BH(4)/BH(3) radical catalysed oxidation of L-arginine to NO, and possibly regulate the rate of inducible NOS/NO production by the NOS dimers, is further advanced. The absence of homology between the NOS and methionine synthase/methylmalonyl CoA mutase may enable GSCbl to regulate both sets of enzymes simultaneously by completely separate mechanisms. Thus, cobalamin may exert central control over both pro-and anti-inflammatory systems.
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Affiliation(s)
- Carmen Wheatley
- Orthomolecular Oncology, 4 Richmond Road, Oxford OX1 2JJ, UK
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Hannibal L, Smith CA, Jacobsen DW, Brasch NE. Nitroxylcob(III)alamin: synthesis and X-ray structural characterization. Angew Chem Int Ed Engl 2007; 46:5140-3. [PMID: 17542034 PMCID: PMC2764306 DOI: 10.1002/anie.200701131] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Luciana Hannibal
- Department of Chemistry and School of Biomedical Sciences, Kent State University, Kent, OH 44242, USA
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Wheatley C. The return of the Scarlet Pimpernel: cobalamin in inflammation II - cobalamins can both selectively promote all three nitric oxide synthases (NOS), particularly iNOS and eNOS, and, as needed, selectively inhibit iNOS and nNOS. JOURNAL OF NUTRITIONAL & ENVIRONMENTAL MEDICINE 2007; 16:181-211. [PMID: 18836533 PMCID: PMC2556189 DOI: 10.1080/10520290701791839] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The up-regulation of transcobalamins [hitherto posited as indicating a central need for cobalamin (Cbl) in inflammation], whose expression, like inducible nitric oxide synthase (iNOS), is Sp1- and interferondependent, together with increased intracellular formation of glutathionylcobalamin (GSCbl), adenosylcobalamin (AdoCbl), methylcobalamin (MeCbl), may be essential for the timely promotion and later selective inhibition of iNOS and concordant regulation of endothelial and neuronal NOS (eNOS/nNOS.) Cbl may ensure controlled high output of nitric oxide (NO) and its safe deployment, because: (1) Cbl is ultimately responsible for the synthesis or availability of the NOS substrates and cofactors heme, arginine, BH(4) flavin adenine dinucleotide/flavin mononucleotide (FAD/FMN) and NADPH, via the far-reaching effects of the two Cbl coenzymes, methionine synthase (MS) and methylmalonyl CoA mutase (MCoAM) in, or on, the folate, glutathione, tricarboxylic acid (TCA) and urea cycles, oxidative phosphorylation, glycolysis and the pentose phosphate pathway. Deficiency of any of theNOS substrates and cofactors results in 'uncoupled' NOS reactions, decreasedNO production and increased or excessive O(2) (-), H(2)O(2), ONOO(-) and other reactive oxygen species (ROS), reactive nitric oxide species (RNIS) leading to pathology. (2) Cbl is also the overlooked ultimate determinant of positive glutathione status, which favours the formation of more benign NO species, s-nitrosothiols, the predominant form in which NO is safely deployed. Cbl status may consequently act as a 'back-up disc' that ensures the active status of antioxidant systems, as well as reversing and modulating the effects of nitrosylation in cell signal transduction.New evidence shows that GSCbl can significantly promote iNOS/ eNOS NO synthesis in the early stages of inflammation, thus lowering high levels of tumour necrosis factor-a that normally result in pathology, while existing evidence shows that in extreme nitrosative and oxidative stress, GSCbl can regenerate the activity of enzymes important for eventual resolution, such as glucose 6 phosphate dehydrogenase, which ensures NADPH supply, lactate dehydrogenase, and more; with human clinical case studies of OHCbl for cyanide poisoning, suggesting Cbl may regenerate aconitase and cytochrome c oxidase in the TCA cycle and oxidative phosphorylation. Thus, Cbl may simultaneously promote a strong inflammatory response and the means to resolve it.
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Affiliation(s)
- Carmen Wheatley
- Orthomolecular Oncology, 4 Richmond Road, Oxford OX1 2JJ, UK
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Hannibal L, Smith C, Jacobsen D, Brasch N. Nitroxylcob(III)alamin: Synthesis and X-ray Structural Characterization. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200701131] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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23
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Wolak M, Stochel G, van Eldik R. Reactivity of aquacobalamin and reduced cobalamin toward S-nitrosoglutathione and S-nitroso-N-acetylpenicillamine. Inorg Chem 2007; 45:1367-79. [PMID: 16441149 DOI: 10.1021/ic051300q] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reactions of aquacobalamin (Cbl(III)H2O, vitamin B12a) and reduced cobalamin (Cbl(II), vitamin B12r) with the nitrosothiols S-nitrosoglutathione (GSNO) and S-nitroso-N-acetylpenicillamine (SNAP) were studied in aqueous solution at pH 7.4. UV-vis and NMR spectroscopic studies and semiquantitative kinetic investigations indicated complex reactivity patterns for the studied reactions. The detailed reaction routes depend on the oxidation state of the cobalt center in cobalamin, as well as on the structure of the nitrosothiol. Reactions of aquacobalamin with GSNO and SNAP involve initial formation of Cbl(III)-RSNO adducts followed by nitrosothiol decomposition via heterolytic S-NO bond cleavage. Formation of Cbl(III)(NO-) as the main cobalamin product indicates that the latter step leads to efficient transfer of the NO- group to the Co(III) center with concomitant oxidation of the nitrosothiol. Considerably faster reactions with Cbl(II) proceed through initial Cbl(II)-RSNO intermediates, which undergo subsequent electron-transfer processes leading to oxidation of the cobalt center and reduction of the nitrosothiol. In the case of GSNO, the overall reaction is fast (k approximately 1.2 x 10(6) M(-1) s(-1)) and leads to formation of glutathionylcobalamin (Cbl(III)SG) and nitrosylcobalamin (Cbl(III)(NO-)) as the final cobalamin products. A mechanism involving the reversible equilibrium Cbl(II) + RSNO <==> Cbl(III)SR + NO is suggested for the reaction on the basis of the obtained kinetic and mechanistic information. The corresponding reaction with SNAP is considerably slower and occurs in two distinct reaction steps, which result in the formation of Cbl(III)(NO-) as the ultimate cobalamin product. The significantly different kinetic and mechanistic features observed for the reaction of GSNO and SNAP illustrate the important influence of the nitrosothiol structure on its reactivity toward metal centers of biomolecules. The potential biological implications of the results are briefly discussed.
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Affiliation(s)
- Maria Wolak
- Faculty of Chemistry, Jagiellonian University, 30060 Krakow, Poland
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Affiliation(s)
- Kenneth L Brown
- Department of Chemistry and Biochemistry, Ohio University, Athens, 45701, USA.
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Wolak M, Stochel G, van Eldik R. Mechanistic studies on the interaction of reduced cobalamin (vitamin B12r) with nitroprusside. J Am Chem Soc 2003; 125:1334-51. [PMID: 12553836 DOI: 10.1021/ja0210852] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The electron-transfer reaction between reduced cobalamin (Cbl(II)) and sodium pentacyanonitrosylferrate(II) (sodium nitroprusside, NP), as well as the subsequent processes following the electron-transfer step, were investigated by spectroscopic (UV-vis, (1)H NMR, EPR), electrochemical (CV, DPV) and kinetic (stopped-flow) techniques. In an effort to clarify the complex reaction pattern observed at physiological pH, systematic spectroscopic and kinetic studies were undertaken as a function of pH (1.8-9) and NP concentration (0.0001 - 0.09 M). The kinetics of the electron-transfer reaction was studied under pseudo-first-order conditions with respect to NP. The reaction occurs in two parallel paths of different order, viz. pseudo-first and pseudo-second order with respect to the NP concentration, respectively. The contribution of each path depends on pH and the [NP]/[Cbl(II)] ratio. At low pH and total NP concentration (pH < 3, [NP]/[Cbl(II)] approximately 1), the cyano-bridged successor complex [Cbl(III)-(mu-NC)-Fe(I)(CN)(3)(NO(+))](-) (1(s)()) is the final reaction product formed in an inner-sphere electron transfer reaction that is coupled to the release of cyanide from coordinated nitroprusside. At higher pH, subsequent reactions were observed which involve the attack of cyanide released in the electron transfer step on the initially formed cyano-bridged species, and lead to the formation of Cbl(III)CN and [Fe(I)(CN)(4)(NO(+))](2)(-). The strong dependence of the rate and mechanism of the subsequent reactions on pH is attributed to the large variation in the effective nucleophilicity of the cyanide ligand in the studied pH range. An alternative electron-transfer pathway observed in the presence of excess NP involves the reaction of the precursor complex [Cbl(II)-(mu-NC)-Fe(II)(CN)(4)(NO(+))](2)(-) (1(p)()) with NP to give [Cbl(III)-(mu-NC)-Fe(II)(CN)(4)(NO(+))](-) (2) and reduced nitroprusside, [Fe(CN)(5)NO](3)(-), as the initial reaction products. Analysis of the kinetic data allowed elucidation of the rate constants for the inner- and outer-sphere electron-transfer pathways. The main factors which influence the kinetics and thermodynamics of the observed electron-transfer steps are discussed on the basis of the spectroscopic, kinetic and electrochemical results. A general picture of the reaction pathways that occur on a short (s) and long (min to h) time scale as a function of pH and relative reactant concentrations is derived from the experimental data. In addition, the release of NO resulting from the one-electron reduction of NP by Cbl(II) was monitored with the use of a sensitive NO electrode. The results obtained in the present study are discussed in reference to the possible influence of cobalamin on the pharmacological action of nitroprusside.
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Affiliation(s)
- Maria Wolak
- Faculty of Chemistry, Jagiellonian University, 30060 Krakow, Poland
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Mimica D, Bedioui F, Zagal JH. Reversibility of the l-cysteine/l-cystine redox process at physiological pH on graphite electrodes modified with coenzyme B12 and vitamin B12. Electrochim Acta 2002. [DOI: 10.1016/s0013-4686(02)00647-3] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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