Guanine Oxidation by Electron Transfer: One- versus Two-Electron Oxidation Mechanism

ChemBioChem ◽  
2005 ◽  
Vol 7 (1) ◽  
pp. 125-133 ◽  
Author(s):  
Adam Kupan ◽  
Aude Saulière ◽  
Sylvain Broussy ◽  
Christel Seguy ◽  
Geneviève Pratviel ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxidation Mechanism ◽  
Guanine Oxidation

Drastic promotion of guanine oxidation via electron transfer in Ψ-type DNA

2019 ◽  
Vol 55 (53) ◽  
pp. 7695-7698 ◽  
Author(s):  
Shunsuke Sakurai ◽  
Mayu Esumi ◽  
Makiko Tanaka
Keyword(s):  
Electron Transfer ◽  
Guanine Oxidation ◽  
Crowded Environment

Drastic promotion of guanine oxidation was induced by not only intraduplex ET but also interduplex ET in Ψ-type DNA in a crowded environment using PEG.

scholarly journals Experimental Support for a Single Electron-Transfer Oxidation Mechanism in Firefly Bioluminescence

2015 ◽  
Vol 137 (24) ◽  
pp. 7592-7595 ◽  
Author(s):  
Bruce R. Branchini ◽  
Curran E. Behney ◽  
Tara L. Southworth ◽  
Danielle M. Fontaine ◽  
Andrew M. Gulick ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxidation Mechanism ◽  
Single Electron ◽  
Single Electron Transfer ◽  
Experimental Support ◽  
Firefly Bioluminescence

scholarly journals Thrombin-Binding Aptamer Quadruplex Formation: AFM and Voltammetric Characterization

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Victor Constantin Diculescu ◽  
Ana-Maria Chiorcea-Paquim ◽  
Ramon Eritja ◽  
Ana Maria Oliveira-Brett
Keyword(s):  
Electron Transfer ◽  
Surface Coverage ◽  
Pyrolytic Graphite ◽  
Oxidation Potential ◽  
Oxidation Peak ◽  
No Adsorption ◽  
Guanine Oxidation ◽  
Force Microscopy ◽  
Atomic Force ◽  
Quadruplex Formation

The adsorption and the redox behaviour of thrombin-binding aptamer (TBA) and extended TBA (eTBA) were studied using atomic force microscopy and voltammetry at highly oriented pyrolytic graphite and glassy carbon. The different adsorption patterns and degree of surface coverage were correlated with the sequence base composition, presence/absence of K+, and voltammetric behaviour of TBA and eTBA. In the presence of K+, only a few single-stranded sequences present adsorption, while the majority of the molecules forms stable and rigid quadruplexes with no adsorption. Both TBA and eTBA are oxidized and the only anodic peak corresponds to guanine oxidation. Upon addition of K+ions, TBA and eTBA fold into a quadruplex, causing the decrease of guanine oxidation peak and occurrence of a new peak at a higher potential due to the oxidation of G-quartets. The higher oxidation potential of G-quartets is due to the greater difficulty of electron transfer from the inside of the quadruplex to the electrode surface than electron transfer from the more flexible single strands.

scholarly journals The mechanism for proton–coupled electron transfer from tyrosine in a model complex and comparisons with Y Z oxidation in photosystem II

2002 ◽  
Vol 357 (1426) ◽  
pp. 1471-1479 ◽  
Author(s):  
Martin Sjödin ◽  
Stenbjörn Styring ◽  
Björn Åkermark ◽  
Licheng Sun ◽  
Leif Hammarström
Keyword(s):  
Electron Transfer ◽  
Photosystem Ii ◽  
Water Oxidation ◽  
Oxidation Mechanism ◽  
Model System ◽  
Proton Coupled Electron Transfer ◽  
Tyrosine Oxidation ◽  
Model Complex ◽  
Primary Donor ◽  
Mn Cluster

In the water–oxidizing reactions of photosystem II (PSII), a tyrosine residue plays a key part as an intermediate electron–transfer reactant between the primary donor chlorophylls (the pigment P 680 ) and the water–oxidizing Mn cluster. The tyrosine is deprotonated upon oxidation, and the coupling between the proton reaction and electron transfer is of great mechanistic importance for the understanding of the water–oxidation mechanism. Within a programme on artificial photosynthesis, we have made and studied the proton–coupled tyrosine oxidation in a model system and been able to draw mechanistic conclusions that we use to interpret the analogous reactions in PSII.

Study of Adenine and Guanine Oxidation Mechanism by Surface-Enhanced Raman Spectroelectrochemistry

2015 ◽  
Vol 119 (15) ◽  
pp. 8191-8198 ◽  
Author(s):  
David Ibañez ◽  
Ana Santidrian ◽  
Aranzazu Heras ◽  
Martin Kalbáč ◽  
Alvaro Colina
Keyword(s):  
Oxidation Mechanism ◽  
Guanine Oxidation ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Inhibiting guanine oxidation and enhancing the excess-electron-transfer efficiency of a pyrene-modified oligonucleotide by introducing an electron-donating group on pyrene

2019 ◽  
Vol 55 (93) ◽  
pp. 14062-14065 ◽  
Author(s):  
Takumi Okuda ◽  
Yusuke Kawashima ◽  
Yuuya Kasahara ◽  
Tatsuya Takagi ◽  
Junpei Yamamoto ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excess Electron ◽  
Transfer Efficiency ◽  
Guanine Oxidation ◽  
Mediated Electron Transfer ◽  
Reduction Efficiency ◽  
Modified Oligonucleotide

PipPyU and OMePyU enhance the reduction efficiency without oxidizing guanine in DNA-mediated electron transfer.

Attenuation of guanine oxidation via DNA-mediated electron transfer in a crowded environment using small cosolutes

2018 ◽  
Vol 16 (36) ◽  
pp. 6695-6702 ◽  
Author(s):  
Makiko Tanaka ◽  
Takayuki Matsumoto ◽  
Hiroki Iida
Keyword(s):  
Electron Transfer ◽  
Molecular Crowding ◽  
Guanine Oxidation ◽  
Mediated Electron Transfer ◽  
Modified Oligonucleotide ◽  
Crowded Environment

Guanine oxidation induced by photoirradiation on a pyrene-modified oligonucleotide was investigated under molecular crowding using small cosolutes such as glycerol.

Intramolecular Electrocatalysis of 8-Oxo-Guanine Oxidation:  Secondary Structure Control of Electron Transfer in Osmium-Labeled Oligonucleotides

2003 ◽  
Vol 42 (20) ◽  
pp. 6379-6387 ◽  
Author(s):  
Rebecca C. Holmberg ◽  
Mark T. Tierney ◽  
Patricia A. Ropp ◽  
Eric E. Berg ◽  
Mark W. Grinstaff ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Secondary Structure ◽  
Guanine Oxidation ◽  
Structure Control
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