1
|
Ragone F, Yañuk JG, Cabrerizo FM, Prieto E, Wolcan E, Ruiz GT. DNA structural changes (photo)induced by tricarbonyl (pterin)rhenium(I) complex. J Inorg Biochem 2024; 252:112471. [PMID: 38181612 DOI: 10.1016/j.jinorgbio.2023.112471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 12/08/2023] [Accepted: 12/20/2023] [Indexed: 01/07/2024]
Abstract
We report on interactions of different types of DNA molecules including double-stranded and plasmid DNA as well as polynucleotides (poly[dGdC]2 and poly[dAdT]2) with fac-[ReI(CO)3(pterin)(H2O)] (or Reptr) complex. The interaction was characterized spectroscopically and changes in the plasmid structure were verified by both electrophoresis and AFM microscopy. For comparative reasons, two others related tricarbonyl rhenium(I) complexes, fac-[(4,4'-bpy)ReI(CO)3(dppz)]+ (or Redppz) and fac-[(CF3SO3)ReI(CO)3(2,2'-bpy)] (or Rebpy) were also studied to further explore the influence of the different co-ligands on the interaction and DNA (photo)damage. Data reported herein suggests that DNA molecules can be structurally modified either by direct interaction with Re(I) complexes in their ground states inducing DNA relaxation, and/or through photoinduced cross-linking processes. The chemical nature of the co-ligands modulates the extent of the damage observed.
Collapse
Affiliation(s)
- F Ragone
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, UNLP, CCT La Plata-CONICET), Diag. 113 y 64, Sucursal 4, C.C. 16, (B1906ZAA) La Plata, Argentina
| | - J G Yañuk
- Instituto Tecnológico de Chascomús (CONICET-UNSAM), Av. Intendente Marino Km 8.2, CC 164 (B7130IWA), Chascomús, Argentina; Escuela de Bio y Nanotecnologías (UNSAM), Argentina
| | - F M Cabrerizo
- Instituto Tecnológico de Chascomús (CONICET-UNSAM), Av. Intendente Marino Km 8.2, CC 164 (B7130IWA), Chascomús, Argentina; Escuela de Bio y Nanotecnologías (UNSAM), Argentina.
| | - E Prieto
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, UNLP, CCT La Plata-CONICET), Diag. 113 y 64, Sucursal 4, C.C. 16, (B1906ZAA) La Plata, Argentina; ICS-UNAJ, Avenida Calchaqui 6200 Florencio Varela, Argentina
| | - E Wolcan
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, UNLP, CCT La Plata-CONICET), Diag. 113 y 64, Sucursal 4, C.C. 16, (B1906ZAA) La Plata, Argentina
| | - G T Ruiz
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA, UNLP, CCT La Plata-CONICET), Diag. 113 y 64, Sucursal 4, C.C. 16, (B1906ZAA) La Plata, Argentina.
| |
Collapse
|
2
|
Castaño C, Serrano MP, Lorente C, Borsarelli CD, Thomas AH. Quenching of the Singlet and Triplet Excited States of Pterin by Amino Acids. Photochem Photobiol 2018; 95:220-226. [DOI: 10.1111/php.13046] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 10/25/2018] [Indexed: 01/08/2023]
Affiliation(s)
- Carolina Castaño
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Departamento de Química; Facultad de Ciencias Exactas; Universidad Nacional de La Plata; CCT La Plata-CONICET; La Plata Argentina
| | - Mariana P. Serrano
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Departamento de Química; Facultad de Ciencias Exactas; Universidad Nacional de La Plata; CCT La Plata-CONICET; La Plata Argentina
| | - Carolina Lorente
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Departamento de Química; Facultad de Ciencias Exactas; Universidad Nacional de La Plata; CCT La Plata-CONICET; La Plata Argentina
| | - Claudio D. Borsarelli
- Instituto de Bionanotecnología del NOA (INBIONATEC); CONICET; Universidad Nacional de Santiago del Estero (UNSE); Santiago del Estero Argentina
| | - Andrés H. Thomas
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Departamento de Química; Facultad de Ciencias Exactas; Universidad Nacional de La Plata; CCT La Plata-CONICET; La Plata Argentina
| |
Collapse
|
3
|
Vignoni M, Walalawela N, Bonesi SM, Greer A, Thomas AH. Lipophilic Decyl Chain–Pterin Conjugates with Sensitizer Properties. Mol Pharm 2017; 15:798-807. [DOI: 10.1021/acs.molpharmaceut.7b00136] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Mariana Vignoni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
| | - Niluksha Walalawela
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Sergio M. Bonesi
- CIHIDECAR-CONICET, Departamento de Química Orgánica, FCEyN, Universidad de Buenos Aires, Pabellón 2, 3er Piso, Ciudad Universitaria, Buenos Aires, Argentina
| | - Alexander Greer
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, New York 10016, United States
| | - Andrés H. Thomas
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina
| |
Collapse
|
4
|
Gonzalez MM, Denofrio MP, García Einschlag FS, Franca CA, Pis Diez R, Erra-Balsells R, Cabrerizo FM. Determining the molecular basis for the pH-dependent interaction between 2'-deoxynucleotides and 9H-pyrido[3,4-b]indole in its ground and electronic excited states. Phys Chem Chem Phys 2015; 16:16547-62. [PMID: 24985024 DOI: 10.1039/c4cp01910e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Interaction between norharmane and three different 2'-deoxynucleotides (dNMP) (2'-deoxyguanosine 5'-monophosphate (dGMP), 2'-deoxyadenosine 5'-monophosphate (dAMP) and 2'-deoxycytidine 5'-monophosphate (dCMP)), in aqueous solution, was studied in the ground state by means of UV-vis and (1)H-NMR spectroscopy and in the first electronic excited state using steady-state and time-resolved fluorescence spectroscopy. In all cases, the norharmane-dNMP interaction dependence on the pH was examined. Possible mechanisms for the interaction of both ground and electronic excited states of norharmane with nucleotides are discussed. Spectroscopic, molecular modeling and chemometric analysis were performed to further characterize the chemical structure of the complexes formed and to get additional information concerning the interaction between dNMPs and norharmane.
Collapse
Affiliation(s)
- M Micaela Gonzalez
- CIHIDECAR - CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, 3p, Ciudad Universitaria, (1428) Buenos Aires, Argentina.
| | | | | | | | | | | | | |
Collapse
|
5
|
Kumar PPP, Suresh CH, Haridas V. A supramolecular approach to metal ion sensing: cystine-based designer systems for Cu2+, Hg2+, Cd2+ and Pb2+ sensing. RSC Adv 2015. [DOI: 10.1039/c4ra14389b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Here, we demonstrate an emergent property from a mixture of two simple cystine containing molecules. The 1 : 1 mixture of pyrene-labelled S1 and tryptophan appended S2 form the heterodimeric system S1 : S2, which shows a unique metal binding ability.
Collapse
Affiliation(s)
- P. P. Praveen Kumar
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| | - Cherumuttathu H. Suresh
- Inorganic and Theoretical Chemistry Section
- CSTD
- CSIR-National Institute for Interdisciplinary Science and Technology
- Thiruvananthapuram 695019
- India
| | - V. Haridas
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi 110016
- India
| |
Collapse
|
6
|
Liu X, Wu Y, Li S, Zhao Y, Yuan C, Jia M, Luo Z, Fu H, Yao J. Quantum-size-effect accommodation of gold clusters with altered fluorescence of dyes. RSC Adv 2015. [DOI: 10.1039/c4ra17239f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Quantum-size-effect accommodation towards Au25 nanoclusters is demonstrated with tunable fluorescence quenching and enhancement of analyte dyes.
Collapse
Affiliation(s)
- Xianhu Liu
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Yishi Wu
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Shuanghao Li
- Institute of Laser Engineering
- Beijing University of Technology
- Beijing
- China
| | - Yan Zhao
- Institute of Laser Engineering
- Beijing University of Technology
- Beijing
- China
| | - Chengqian Yuan
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Meiye Jia
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Zhixun Luo
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Hongbing Fu
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Jiannian Yao
- Beijing National Laboratory for Molecular Sciences (BNLMS)
- State Key Laboratory for Structural Chemistry of Unstable and Stable Species
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| |
Collapse
|
7
|
Zhang H, Liu Y, Zhang R, Liu R, Chen Y. Binding mode investigations on the interaction of lead(II) acetate with human chorionic gonadotropin. J Phys Chem B 2014; 118:9644-50. [PMID: 25096834 DOI: 10.1021/jp505565s] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Lead exposure could induce endocrine disruption and hormonal imbalance of humans, resulting in detrimental effects on the reproductive system even at low doses. However, mechanisms of lead actions remain unknown. This article investigated lead interactions with human chorionic gonadotropin (HCG) as a conceivable mechanism of its reproductive toxicity by spectroscopic technique, isothermal titration calorimetry (ITC), molecular docking study, and enzyme-linked immunosorbent assay (ELISA). Fluorescence measurements showed that lead acetate dynamically quenched intrinsic fluorescence of HCG through collisional mechanism with the association constant (KSV) in the magnitude of 10(3) L/mol at the detected temperatures (298, 303, and 310 K). ITC and molecular docking results revealed lead acetate could bind into 5 binding sites of HCG through electrostatic effects (ΔH < 0, ΔS > 0) and hydrophobic forces (ΔH > 0, ΔS > 0). The conformational investigation of HCG by UV-vis absorption spectroscopy, circular dichroism spectroscopy, and ELISA indicated lead acetate changed the secondary structure of HCG by loosening and destruction of HCG skeleton and increasing the hydrophobicity around Tyr residues and resulted in the decreased bioactivities of HCG. This work presents direct interactions of lead with sex hormones and obtains a possible mechanism on lead induced reproductive toxicity at the molecular level.
Collapse
Affiliation(s)
- Hao Zhang
- School of Environmental Science and Engineering, Shandong University , 27 Shanda Nanlu, Jinan 250100, P. R. China
| | | | | | | | | |
Collapse
|
8
|
Pauszek RF, Kodali G, Stanley RJ. Excited state electronic structures of 5,10-methenyltetrahydrofolate and 5,10-methylenetetrahydrofolate determined by Stark spectroscopy. J Phys Chem A 2014; 118:8320-8. [PMID: 24814224 DOI: 10.1021/jp501143u] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Folates are ubiquitous cofactors that participate in a wide variety of critical biological processes. 5,10-Methenyltetrahydrofolate and its photodegradation product 5,10-methylenetetrahydrofolate are both associated with the light-driven DNA repair protein DNA photolyase and its homologues (e.g., cryptochromes). The excited state electronic properties of these folate molecules have been studied here using Stark spectroscopy and complementary quantum calculations. The tetrahydrofolates have relatively large difference dipole moments (ca. 6-8 Debye) and difference polarizabilities (ca. 100 Å(3)). This extensive excited state charge redistribution appears to be due largely to the pendant p-aminobenzoic acid group, which helps shuttle charge over the entirety of the molecule. Simple calculations based on the experimental difference dipole moments suggest that tetrahydrofolates should have large two photon cross sections sufficient to enable two photon microscopy to selectively detect and follow folate-containing proteins both in vitro and in vivo.
Collapse
Affiliation(s)
- Raymond F Pauszek
- Department of Chemistry, Temple University , Philadelphia, Pennsylvania 19122, United States
| | | | | |
Collapse
|
9
|
Denofrio MP, Ogilby PR, Thomas AH, Lorente C. Selective quenching of triplet excited states of pteridines. Photochem Photobiol Sci 2014; 13:1058-65. [DOI: 10.1039/c4pp00079j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
10
|
Haridas V, Praveen Kumar PP, Suresh CH. Cysteine-based fluorescence “turn-on” sensors for Cu2+ and Ag+. RSC Adv 2014. [DOI: 10.1039/c4ra10936h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Amino acid cysteine was transformed to fluorescent turn-on sensors for Cu+2 and Ag+. The metal ion binding was studied in detail by spectroscopic, microscopic, calorimetric and computational methods.
Collapse
Affiliation(s)
- V. Haridas
- Department of Chemistry
- Indian Institute of Technology Delhi
- Hauz Khas-110016, India
| | - P. P. Praveen Kumar
- Department of Chemistry
- Indian Institute of Technology Delhi
- Hauz Khas-110016, India
| | - Cherumuttathu H. Suresh
- Inorganic and Theoretical Chemistry Section, CSTD, CSIR-National Institute for Interdisciplinary Science and Technology
- Thiruvananthapuram – 695019, India
| |
Collapse
|
11
|
Sakai KI, Nagahara K, Yoshii Y, Hoshino N, Akutagawa T. Structural and Spectroscopic Study of 6,7-Dicyano-Substituted Lumazine with High Electron Affinity and Proton Acidity. J Phys Chem A 2013; 117:3614-24. [DOI: 10.1021/jp401528c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ken-ichi Sakai
- Department of Bio- and Material
Photonics, Chitose Institute of Science and Technology (CIST), Chitose 066-8655, Japan
| | - Kenta Nagahara
- Department of Bio- and Material
Photonics, Chitose Institute of Science and Technology (CIST), Chitose 066-8655, Japan
| | - Yuuya Yoshii
- Polymer Hybrid Materials Research
Center, Institute of Multidisciplinary Research for Advanced Materials
(IMRAS), Tohoku University, Sendai 980-8577,
Japan
| | - Norihisa Hoshino
- Polymer Hybrid Materials Research
Center, Institute of Multidisciplinary Research for Advanced Materials
(IMRAS), Tohoku University, Sendai 980-8577,
Japan
| | - Tomoyuki Akutagawa
- Polymer Hybrid Materials Research
Center, Institute of Multidisciplinary Research for Advanced Materials
(IMRAS), Tohoku University, Sendai 980-8577,
Japan
| |
Collapse
|
12
|
Samanta D, Mukherjee PS. PtII6 nanoscopic cages with an organometallic backbone as sensors for picric acid. Dalton Trans 2013; 42:16784-95. [DOI: 10.1039/c3dt52268g] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
13
|
Meng QH, Zhou P, Song F, Wang YB, Liu GL, Li H. Controlled fluorescent properties of Zn(ii) salen-type complex based on ligand design. CrystEngComm 2013. [DOI: 10.1039/c3ce26935c] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
|
14
|
Saleh N, Graham J, Afaneh A, Al-Soud YA, Schreckenbach G, Esmadi FT. Pteridine-based fluorescent pH sensors designed for physiological applications. J Photochem Photobiol A Chem 2012. [DOI: 10.1016/j.jphotochem.2012.08.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
15
|
Gonzalez MM, Rasse-Suriani FAO, Franca CA, Diez RP, Gholipour Y, Nonami H, Erra-Balsells R, Cabrerizo FM. Photosensitized electron transfer within a self-assembled norharmane-2'-deoxyadenosine 5'-monophosphate (dAMP) complex. Org Biomol Chem 2012; 10:9359-72. [PMID: 23111419 DOI: 10.1039/c2ob26462e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Norharmane is a compound that belongs to a family of alkaloids called β-carbolines (βCs). These alkaloids are present in a wide range of biological systems, playing a variety of significant photo-dependent roles. Upon UV-A irradiation, βCs are able to act as efficient photosensitizers. In this work, we have investigated the photosensitized oxidation of 2'-deoxyadenosine 5'-monophosphate (dAMP) by norharmane in an aqueous phase, upon UV-A (350 nm) irradiation. The effect of the pH was evaluated on both the interactions between norharmane and dAMP in the ground and electronic excited states, and on the dAMP photosensitized oxidation. A quite strong static interaction between norharmane and dAMP was observed, especially under those pH conditions where the protonated form of the alkaloid is present (pH < 7). Theoretical studies were performed to further characterize the static complex structure. The participation of reactive oxygen species (ROS) in the photosensitized reaction was also investigated and the photoproducts were characterized by means of UV-LDI-MS and ESI-MS. All the data provided herein indicate that electron transfer (Type I) within a self-assembled norharmane-dAMP complex is the operative mechanism in the dAMP photosensitization.
Collapse
Affiliation(s)
- M Micaela Gonzalez
- CIHIDECAR - CONICET, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, 3p, Ciudad Universitaria, (1428) Buenos Aires, Argentina
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Serrano MP, Lorente C, Vieyra FEM, Borsarelli CD, Thomas AH. Photosensitizing properties of biopterin and its photoproducts using 2'-deoxyguanosine 5'-monophosphate as an oxidizable target. Phys Chem Chem Phys 2012; 14:11657-65. [PMID: 22825359 DOI: 10.1039/c2cp41476g] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
UV-A radiation (320-400 nm) induces damage to the DNA molecule and its components through photosensitized reactions. Biopterin (Bip) and its photoproducts 6-formylpterin (Fop) and 6-carboxypterin (Cap) accumulate in the skin of human beings suffering from vitiligo, a depigmentation disorder where the protection against UV radiation fails because of the lack of melanin. This study was aimed to evaluate the photosensitizing properties of oxidized pterins present in the skin and to elucidate the mechanisms involved in the photosensitized oxidation of purine nucleotides by pterins in vitro. For this purpose, steady-state and time-resolved experiments in acidic (pH 5.0-5.8) aqueous solution were performed using Bip, Fop and Cap as photosensitizers and the nucleotide 2'-deoxyguanosine 5'-monophosphate (dGMP) as an oxidizable target. The three pterin derivatives are able to photosensitize dGMP, being Fop the most efficient sensitizer. The reactions proceed through two competing pathways: (1) electron transfer from dGMP to triplet excited-state of pterins (type I mechanism) and (2) reaction of dGMP with (1)O(2) produced by pterins (type II mechanism). Kinetic analysis revealed that the electron transfer pathway is the main mechanism and the interaction of dGMP with the triplet excited-state of pterins and the formation of the corresponding dGMP radicals were demonstrated by laser flash photolysis experiments. The biological implications of the results obtained are also discussed.
Collapse
Affiliation(s)
- Mariana P Serrano
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CCT La Plata-CONICET, La Plata, Argentina
| | | | | | | | | |
Collapse
|
17
|
Rate constants of quenching of the fluorescence of pterins by the iodide anion in aqueous solution. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.06.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
18
|
Gonzalez MM, Vignoni M, Pellon-Maison M, Ales-Gandolfo MA, Gonzalez-Baro MR, Erra-Balsells R, Epe B, Cabrerizo FM. Photosensitization of DNA by β-carbolines: Kinetic analysis and photoproduct characterization. Org Biomol Chem 2012; 10:1807-19. [DOI: 10.1039/c2ob06505c] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
|
19
|
Serrano MP, Vignoni M, Dántola ML, Oliveros E, Lorente C, Thomas AH. Emission properties of dihydropterins in aqueous solutions. Phys Chem Chem Phys 2011; 13:7419-25. [PMID: 21409193 DOI: 10.1039/c0cp02912b] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
Pterins belong to a class of heterocyclic compounds present in a wide range of living systems and accumulate in the skin of patients affected by vitiligo, a depigmentation disorder. The study of the emission of 7,8-dihydropterins is difficult because these compounds are more or less unstable in the presence of O(2) and their solutions are contaminated with oxidized pterins which have much higher fluorescence quantum yields (Φ(F)). In this work, the emission properties of six compounds of the dihydropterin family (6-formyl-7,8-dihydropterin (H(2)Fop), sepiapterin (Sep), 7,8-dihydrobiopterin (H(2)Bip), 7,8-dihydroneopterin (H(2)Nep), 6-hydroxymethyl-7,8-dihydropterin (H(2)Hmp), and 6-methyl-7,8-dihydropterin (H(2)Mep)) have been studied in aqueous solution. The fluorescence characteristics (spectra, Φ(F), lifetimes (τ(F))) of the neutral form of these compounds have been investigated using the single-photon-counting technique. Φ(F) and τ(F) values obtained lie in the ranges 3-9 × 10(-3) and 0.18-0.34 ns, respectively. The results are compared to those previously reported for oxidized pterins.
Collapse
Affiliation(s)
- Mariana P Serrano
- INIFTA, Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CCT La Plata-CONICET., C.C. 16, Suc. 4, (1900) La Plata, Argentina
| | | | | | | | | | | |
Collapse
|
20
|
Kozhevnikov DN, Prokhorov AM. Triazines, Tetrazines and Fused Ring Polyaza Systems. PROGRESS IN HETEROCYCLIC CHEMISTRY 2011. [DOI: 10.1016/s0959-6380(11)22014-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
21
|
Narayanan M, Kodali G, Singh V, Xing Y, Hawkins ME, Stanley RJ. Differential fluorescence quenching of fluorescent nucleic acid base analogues by native nucleic acid monophosphates. J Phys Chem B 2010; 114:5953-63. [PMID: 20387838 DOI: 10.1021/jp1011507] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Fluorescent nucleic acid base analogues (FBAs) are used widely as probes of DNA and RNA structure and dynamics. Of increasing utility are the pteridone adenosine analogues (6MAP, DMAP) and pteridine guanosine analogues (3MI, 6MI). These FBAs (collectively referred to as PTERs) are useful, in part, because their fluorescence quantum yields, Phi(f), are modulated by base stacking with native bases (NBs), making them sensitive reporters of DNA structure. The quenching mechanism has been hypothesized to be photoinduced electron transfer following selective excitation of the FBA, but hard evidence for this has been lacking. The degree of quenching shows some dependence on the neighboring bases, but there has been no real determination as to whether FBA*:NB complexes satisfy the basic thermodynamic requirement for spontaneous PET: a negative free energy for the electron transfer reaction. Indeed, quenching may result from entirely different mechanisms. To address these questions, Stern-Volmer (S-V) experiments were performed using the native-base monophosphate nucleotides (NMPs) GMP, AMP, CMP, and dTMP in aqueous solutions as quenchers to obtain quenching rate constants, k(q). Cyclic voltammetry (CV) and optical absorption and emission data of the PTERS were obtained in aprotic organic solvents. These data were used to obtain excited-state redox potentials from which electron transfer free energies were derived using the Rehm-Weller equation. The reorganization energies for PET were obtained using the Scandola-Balzani equation, taking into account the free energy contribution due to water. 6MAP*, DMAP*, and 3MI* gave negative free energies between -0.1 and -0.2 eV and reorganization energies of about 0.13 eV. They all displayed ET activation energies below the accessible thermal energy (0.038 eV = 3/2k(B)T, where k(B) is Boltzmann's constant) for all NMPs with the exception of CMP, whose activation barrier was only about 35% higher (approximately 0.05 eV). Thus, we conclude that these PTERs act as electron acceptors and promote NMP oxidation. However, 6MI* had positive ET free energies for all NMPs with the exception of GMP (and then only for nucleobase oxidation). The magnitudes of these free energies (> or = 0.45 eV for AMP, CMP, and dTMP) suggest that 6MI* may not quenched by PET.
Collapse
Affiliation(s)
- Madhavan Narayanan
- Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, USA
| | | | | | | | | | | |
Collapse
|