Photoinduced short-range electron transfer in DNA with fluorescent DNA bases: lessons from ethidium and thiazole orange as charge donors

2010 ◽  
Vol 12 (1) ◽  
pp. 32-43 ◽  
Author(s):  
Christa Prunkl ◽  
Sina Berndl ◽  
Claudia Wanninger-Weiß ◽  
Janez Barbaric ◽  
Hans-Achim Wagenknecht
Keyword(s):  
Electron Transfer ◽  
Short Range ◽  
Dna Bases ◽  
Thiazole Orange

Thiazole Orange and Cy3: Improvement of Fluorescent DNA Probes with Use of Short Range Electron Transfer

2008 ◽  
Vol 73 (11) ◽  
pp. 4263-4266 ◽  
Author(s):  
Florian Menacher ◽  
Moritz Rubner ◽  
Sina Berndl ◽  
Hans-Achim Wagenknecht
Keyword(s):  
Electron Transfer ◽  
Short Range ◽  
Dna Probes ◽  
Thiazole Orange

scholarly journals Electron migration in DNA matrix: an electron transfer reaction

1998 ◽  
Vol 23 (0) ◽  
pp. 99-109 ◽  
Author(s):  
Cecília Dominical POY ◽  
Marinônio Lopes CORNÉLIO
Keyword(s):  
Electron Transfer ◽  
Methyl Viologen ◽  
Transfer Reaction ◽  
Electron Transfer Reaction ◽  
Dna Bases ◽  
Base Pairs ◽  
Dna Molecule ◽  
A Value ◽  
Donor And Acceptor ◽  
Electron Migration

This paper brings an active and provocative area of current research. It describes the investigation of electron transfer (ET) chemistry in general and ET reactions results in DNA in particular. Two DNA intercalating molecules were used: Ethidium Bromide as the donor (D) and Methyl-Viologen as the acceptor (A), the former intercalated between DNA bases and the latter in its surface. Using the Perrin model and fluorescence quenching measurements the distance of electron migration, herein considered to be the linear spacing between donor and acceptor molecule along the DNA molecule, was obtained. A value of 22.6 (± 1.1) angstroms for the distance and a number of 6.6 base pairs between donor and acceptor were found. In current literature the values found were 26 angstroms and almost 8 base pairs. DNA electron transfer is considered to be mediated by through-space interactions between the p-electron-containing base pairs.

Ultrafast nonequilibrium dynamics of short-range protein electron transfer in flavodoxin

2021 ◽  
Author(s):  
Jie Yang ◽  
Yifei Zhang ◽  
Ting-Fang He ◽  
Yangyi Lu ◽  
lijuan Wang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Short Range ◽  
Nonequilibrium Dynamics ◽  
Protein Electron Transfer

Short-range protein electron transfer (ET) is ubiquitous in biology and is often observed in photosyntheses, photoreceptors and photoenzymes. These ET processes occur on an ultrafast timescale from femtoseconds to picoseconds...

Evidence of short-range electron transfer of a redox enzyme on graphene oxide electrodes

2014 ◽  
Vol 16 (33) ◽  
pp. 17426-17436 ◽  
Author(s):  
Marccus V. A. Martins ◽  
Andressa R. Pereira ◽  
Roberto A. S. Luz ◽  
Rodrigo M. Iost ◽  
Frank N. Crespilho
Keyword(s):  
Electron Transfer ◽  
Graphene Oxide ◽  
Glucose Oxidase ◽  
Electrode Surface ◽  
Short Range ◽  
Redox Enzyme ◽  
Oxide Electrodes ◽  
Oxidase Enzyme ◽  
Graphene Oxide Sheets

Graphene oxide sheets provide short-range electron transfer from the glucose oxidase enzyme to the electrode surface.

Electron transfer in biologically important systems: Polycyclic aromatic hydrocarbons, DNA bases and free radicals

2018 ◽  
Vol 17 (01) ◽  
pp. 1850008
Author(s):  
M. K. Tiwari ◽  
P. C. Mishra
Keyword(s):  
Electron Transfer ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Free Radicals ◽  
Aromatic Hydrocarbons ◽  
Polarizable Continuum Model ◽  
Dna Bases ◽  
Free Energies ◽  
Species Barrier ◽  
Polycyclic Aromatic ◽  
Polarizable Continuum

Occurrence of electron transfer was studied for different combinations of polycyclic aromatic hydrocarbons (PAHs) and DNA bases as electron donors or acceptors and free radicals only as electron acceptors. Geometries of all the molecules and radicals were optimized in aqueous medium employing the polarizable continuum model. Single electron transfer (SET) and sequential proton loss electron transfer mechanisms were investigated employing Gibbs free energies of the appropriate neutral, anionic and cationic species. Barrier energies involved in these phenomena were calculated using the Marcus theory. The SET barrier energies were found to be linearly correlated with [Formula: see text] (Electron affinities of acceptors – Ionization potentials of donors). SET barrier energies from the DNA bases to the PAHs follow the order Cy [Formula: see text] Th [Formula: see text] Ad [Formula: see text] Gu, whereas SET barrier energies from the PAHs to the DNA bases follow the order Gu [Formula: see text] Ad [Formula: see text] Th [Formula: see text] Cy. Thus, guanine, among the DNA bases, is the best electron donor to the PAHs and worst electron acceptor from the same.

Energetic Contributions to the Two-Electron Bond: A Simplified Group Function (SGF) Analysis

1987 ◽  
Vol 40 (4) ◽  
pp. 635 ◽  
Author(s):  
PE Schipper
Keyword(s):  
Electron Transfer ◽  
Power Series ◽  
Short Range ◽  
Covalent Bonding ◽  
Zeroth Order ◽  
Group Function ◽  
Effective Power ◽  
First Order ◽  
Excitonic States ◽  
Covalent Interactions

The group function (GF) formalism coupled with the limit in which intergroup electron interchange symmetry is rigorously neglected (the simplified group function (SGF) approach) is shown to lead to a resolution of intergroup bonding as an effective power series in overlap density. The successive orders are shown to correspond to a concomitant resolution into traditional bonding contributions: zeroth order leads to the conventional excitonic description (no electron transfer or interchange); first-order terms may be interpreted as dative bonding, in which electron transfer configurations mix with the excitonic states; and finally, second-order terms correspond directly to the incorporation of electron interchange symmetry and hence to pure covalent bonding. A conceptual parallelism of the division of long range (static, inductive and dispersive) interactions with short range (ionic, dative and covalent) interactions is drawn to emphasize the unity of these apparently disparate limits in the SGF/GF analysis. Explicit application to the archetypical two-electron bond highlights the conceptual simplicity of the approach, and is compared to a commensurate MO and VB analysis expressed in terms of the same integrals. The results show clearly why such a simple resolution is difficult to extract from MO and VB approaches, which are philosophically biased towards the strong bonding limit.

Sign in / Sign up

Export Citation Format

Share Document