1
|
McEvoy JP, Pham N, Le HT, Fernandez MM, Farmer RP, Mahapatro SN. Two-electron redox chemistry of p-nitro- and p-cyanobenzene diazohydroxides. RSC Adv 2018; 8:41762-41766. [PMID: 35558800 PMCID: PMC9092087 DOI: 10.1039/c8ra05948a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 12/04/2018] [Indexed: 11/24/2022] Open
Abstract
The electrochemistry of aryl diazonium salts is usually dominated by one-electron reduction, loss of dinitrogen, and the grafting of aryl radicals onto the electrode. In contrast, p-nitro- and p-cyanobenzene diazonium salts dissolved in mixed aqueous-acetonitrile solvents showed diffusion-limited, quasi-reversible, two-electron cyclic voltammetry. Voltammetric pH-dependence and spectrophotometric kinetic studies suggest that the basicity and low polarity of the aqueous solvent mixture has revealed the biologically-significant interconversion of diazohydroxide and diazene. We report the interconversion of diazohydroxide and diazene species in mixed aqueous-acetonitrile solutions.![]()
Collapse
Affiliation(s)
- James P. McEvoy
- Centre for Biomedical Sciences
- School of Biological Sciences
- Royal Holloway University of London
- Surrey
- UK
| | - Nhan V. Pham
- Department of Chemistry
- Regis University
- Denver
- USA
| | - Hong T. Le
- Department of Chemistry
- Regis University
- Denver
- USA
| | | | | | | |
Collapse
|
2
|
Wang M, Xie R, Jia X, Liu R. Urinary Volatile Organic Compounds as Potential Biomarkers in Idiopathic Membranous Nephropathy. Med Princ Pract 2017; 26. [PMID: 28633145 PMCID: PMC5768119 DOI: 10.1159/000478782] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE To detect urinary volatile organic compounds (VOCs) in patients with idiopathic membranous nephropathy (iMN) and normal controls, and to examine whether or not urinary VOCs can act as biomarkers for the diagnosis of iMN independent of renal biopsy. MATERIALS AND METHODS Gas chromatography/mass spectrometry (GC/MS) was used to assess the urine collected from 63 iMN patients and 15 normal controls. The statistical methods of principal component analysis and partial least squares discriminant analysis were performed to process the final data in Common Data Format which were converted from GC/MS data. RESULTS Six VOCs in the urine samples of iMN patients exhibited significant differences from those of normal controls: carbamic acid monoammonium salt, 2-pentanone, 2,4-dimethyl-pentanal, hydrogen azide, thiourea, and 4-heptanone were significantly higher than in controls (p < 0.05). CONCLUSIONS Six urinary VOCs were isolated from patients with iMN using GC/MS. The analysis of urinary VOCs using GC/MS could be developed into a non-invasive method for the detection of iMN.
Collapse
Affiliation(s)
| | | | | | - Ruichan Liu
- *Ruichan Liu, Department of Nephrology, The First Affiliated Hospital of Harbin Medical University, 23 Youzheng Street, Nangang District, Harbin 150001 (China), E-Mail
| |
Collapse
|
3
|
Enciso E, Sarmiento-Sánchez JI, López-Moreno HS, Ochoa-Terán A, Osuna-Martínez U, Beltrán-López E. Synthesis of new quinazolin-2,4-diones as anti-Leishmania mexicana agents. Mol Divers 2016; 20:821-828. [DOI: 10.1007/s11030-016-9693-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 08/07/2016] [Indexed: 11/24/2022]
|
4
|
Dostál L, Růžička A, Jambor R. Deamination of N→Sn‐Coordinated Organotin(II) Hydroxide: Formation of a New C–O Covalent Bond. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402836] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Libor Dostál
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 95, 53210 Pardubice, Czech Republic, http://www.upce.cz
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 95, 53210 Pardubice, Czech Republic, http://www.upce.cz
| | - Roman Jambor
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 95, 53210 Pardubice, Czech Republic, http://www.upce.cz
| |
Collapse
|
5
|
Glaser R, Ulmer L, Coyle S. Mechanistic models for LAH reductions of acetonitrile and malononitrile. Aggregation effects of Li+ and AlH3 on imide-enamide equilibria. J Org Chem 2013; 78:1113-26. [PMID: 23327108 DOI: 10.1021/jo302527k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The results are reported of an ab initio study of the addition of LiAlH(4) to acetonitrile and malononitrile at the MP2(full)/6-311+G* level considering the effects of electron correlation at higher levels up to QCISD(T)/6-311++G(2df,2pd) and including ether solvation. All imide (RCH(2)CH═N(-)) and enamide (RCH(-)CH═NH ↔ RCH═CHN(-)H) adducts feature strong interactions between the organic anion and both Li(+) and AlH(3). The relative stabilities of the tautomeric LAH adducts are compared to the tautomer preference energies of the LiH adducts and of the hydride adducts of the nitriles. Alane affinities were determined for the lithium ion pairs formed by LiH addition to the nitriles. The results show that alane binding greatly affects the imide-enamide equilibria and that alane complexation might even provide a thermodynamic preference for the imide intermediate. While lithium enamides of malononitrile are much more stable than lithium imides, alane binding dramatically reduces the enamide preference so that both tautomers are present at equilibrium. Implications are discussed regarding to the propensity for multiple hydride reductions and with regard to the mechanism of reductive nitrile dimerization. A detailed mechanism is proposed for the formation of 2-aminonicotinonitrile (2ANN) in the LAH reduction of malononitrile.
Collapse
Affiliation(s)
- Rainer Glaser
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA.
| | | | | |
Collapse
|
6
|
Uddin KM, Poirier RA. Computational Study of the Deamination of 8-Oxoguanine. J Phys Chem B 2011; 115:9151-9. [DOI: 10.1021/jp202098k] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Kabir M. Uddin
- Department of Chemistry, Memorial University, St. John’s, Newfoundland, Canada A1B 3X7
| | - Raymond A. Poirier
- Department of Chemistry, Memorial University, St. John’s, Newfoundland, Canada A1B 3X7
| |
Collapse
|
7
|
Sagi J, Renciuk D, Tomasko M, Vorlícková M. Quadruplexes of human telomere DNA analogs designed to contain G:A:G:A, G:G:A:A, and A:A:A:A tetrads. Biopolymers 2011; 93:880-6. [PMID: 20564052 DOI: 10.1002/bip.21481] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Replacement of two to four guanines by adenines in the human telomere DNA repeat dG3(TTAG3)3 did not hinder the formation of quadruplexes if the substitutions took place in the terminal tetrad bridged by the diagonal loop of the intramolecular antiparallel three-tetrad scaffold, as proved by CD and PAGE in both Na+ and K+ solutions. Thermodynamic data showed that, in Na+ solution, the dG3(TTAG3)3 quadruplex was destabilized, the least by the two G:A:G:A tetrads, the most by the G:G:A:A tetrad in which the adenosines replaced syn-guanosines. In physiological K+ solution, the highest destabilization was caused by the 4A tetrad. In K+, only the unmodified dG3(TTAG3)3 quadruplex rearranged into a K+-dependent quadruplex form, none of the multiple adenine-modified structures did so. This may imply biological consequences for nonrepaired A-for-G mutations.
Collapse
Affiliation(s)
- Janos Sagi
- Rimstone Laboratory, RLI, 29 Lancaster Way, Cheshire, CT 06410, USA
| | | | | | | |
Collapse
|
8
|
Uddin KM, Almatarneh MH, Shaw DM, Poirier RA. Mechanistic Study of the Deamination Reaction of Guanine: A Computational Study. J Phys Chem A 2011; 115:2065-76. [DOI: 10.1021/jp1120806] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Kabir M. Uddin
- Department of Chemistry and ‡The Atlantic Computational Excellence Network, Memorial University, St. John’s, Newfoundland, Canada A1B 3X7
| | - Mansour H. Almatarneh
- Department of Chemistry and ‡The Atlantic Computational Excellence Network, Memorial University, St. John’s, Newfoundland, Canada A1B 3X7
| | - Dawn M. Shaw
- Department of Chemistry and ‡The Atlantic Computational Excellence Network, Memorial University, St. John’s, Newfoundland, Canada A1B 3X7
| | - Raymond A. Poirier
- Department of Chemistry and ‡The Atlantic Computational Excellence Network, Memorial University, St. John’s, Newfoundland, Canada A1B 3X7
| |
Collapse
|
9
|
Tomasko M, Vorlícková M, Sagi J. Substitution of adenine for guanine in the quadruplex-forming human telomere DNA sequence G(3)(T(2)AG(3))(3). Biochimie 2008; 91:171-9. [PMID: 18852018 DOI: 10.1016/j.biochi.2008.07.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2008] [Accepted: 07/30/2008] [Indexed: 11/17/2022]
Abstract
We have studied the formation and structural properties of quadruplexes of the human telomeric DNA sequence G(3)(T(2)AG(3))(3) and related sequences in which each guanine base was replaced by an adenine base. None of these single base substitutions hindered the formation of antiparallel quadruplexes, as shown by circular dichroism, gel electrophoresis, and UV thermal stability measurements in NaCl solutions. Effect of substitution did differ, however, depending on the position of the substituted base. The A-for-G substitution in the middle quartet of the antiparallel basket scaffold led to the most distorted and least stable structures and these sequences preferred to form bimolecular quadruplexes. Unlike G(3)(T(2)AG(3))(3), no structural transitions were observed for the A-containing analogs of G(3)(T(2)AG(3))(3) when sodium ions were replaced by potassium ions. The basic quadruplex topology remained the same for all sequences studied in both salts. As in vivo misincorporation of A for a G in the telomeric sequence is possible and potassium is a physiological salt, these findings may have biological relevance.
Collapse
Affiliation(s)
- Martin Tomasko
- Institute of Biophysics, Academy of Sciences of the Czech Republic, Brno, Czech Republic
| | | | | |
Collapse
|
10
|
Almatarneh MH, Flinn CG, Poirier RA. Mechanisms for the Deamination Reaction of Cytosine with H2O/OH− and 2H2O/OH−: A Computational Study. J Chem Inf Model 2008; 48:831-43. [DOI: 10.1021/ci7003219] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mansour H. Almatarneh
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada A1B 3X7
| | - Christopher G. Flinn
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada A1B 3X7
| | - Raymond A. Poirier
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, Newfoundland, Canada A1B 3X7
| |
Collapse
|
11
|
Beda NV, Nedospasov AA. NO-dependent modifications of nucleic acids. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2007; 33:195-228. [PMID: 17476982 DOI: 10.1134/s106816200702001x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
This review is devoted to chemical transformations of nucleic acids and their components under the action of nitrogen oxide metabolites. The deamination reaction of bases is discussed in the context of possible competing transformations of its intermediates (nitrosamines, diazonium cations, diazotates, triazenes, and diazoanhydrides) and mechanisms of crosslink formation with proteins and nucleic acids. The oxidation and nitration of bases by NO2 is considered together with the possibility of radical transfer to domains from the base stacks in DNA. Reduction of redox potentials of bases as a result of stacking interactions explains the possibility of their reactions within nucleic acids with the oxidants whose redox potential is insufficient for the effective reactions with mononucleotides. Modifications of nucleic acids with peroxynitrite derivatives are discussed in the context of the effect of the DNA primary structure and the modification products formed on the reactivity of single bases. The possibility of reduction of nitro groups within modified bases to amino derivatives and their subsequent diazotation is considered. The substitution of oxoguanine for nitroguanine residues may result; the reductive diazotation can lead to undamaged guanine. The intermediate modified bases, e.g., 8-aminoguanine and 8-diazoguanine, were shown to participate in noncanonical base pairing, including the formation of more stable bonds with two bases, which is characteristic of the DNA Z-form. A higher sensitivity of RNA in comparison with DNA to NO-dependent modifications (NODMs) is predicted on the basis of the contribution of medium microheterogeneity and the known mechanisms of nitrosylation and nitration. The possible biological consequences of nucleic acids NODMs are briefly considered. It is shown that the NODMs under the action of nitrogen oxide metabolites generated by macrophages and similar cells in inflammations or infections should lead to a sharp increase in the number of mutations in the case of RNA-containing viruses. As a result, the defense mechanisms of the host organism may contribute to the appearance of new, including more dangerous, variants of infecting viruses.
Collapse
|
12
|
Glaser R, Wu H, von Saint Paul F. Chemical carcinogens in non-enzymatic cytosine deamination: 3-isocyanatoacrylonitrile. J Mol Model 2006; 12:731-7. [PMID: 16411080 PMCID: PMC2441498 DOI: 10.1007/s00894-005-0048-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2005] [Accepted: 09/29/2005] [Indexed: 10/27/2022]
Abstract
Uracil has long been known as the main product of nitrosative cytosine deamination in aqueous solution. Recent mechanistic studies of cytosinediazonium ion suggest that the cation formed by its dediazoniation can ring-open to N-protonated (Z,s-cis)-3-isocyanatoacrylonitrile 7. Stereochemical preferences are discussed of the 3-isocyanatoacrylonitriles (Z,s-cis)-10, (E,s-cis)-11, (Z,s-trans)-12, and (E,s-trans)-13. The electronic structures of 7 and 10-13 have been analyzed and a rationale is provided for the thermodynamic preference for (Z,s-cis)-10. It is shown that s-cis/s-trans-interconversion occurs via C-N rotation-inversion paths with barriers below 3 kcal mol(-1). The proton affinities of 3-isocyanatoacrylonitrile 10 and water are nearly identical and, thus, 3-isocyanatoacrylonitriles can and should be formed in aqueous media from 7 along with 3-aminoacrylonitriles 9. The results highlight the relevance of the chemistry of 3-isocyanatoacrylonitriles for the understanding of the chemical toxicology of nitrosation of the nucleobase cytosine.
Collapse
Affiliation(s)
- Rainer Glaser
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO 65211, USA.
| | | | | |
Collapse
|