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3.1TheDNAMolecule
Table3.1: The studied DNA fragments of the first part of this work. Shown are the
descriptors used throughout this work and the nucleobase sequence of the
well-matcheddsDNAoligomers.
Homogeneous sequences
A5 5’-AAAAA-3’
3’-TTTTT-5’
A9 5’-AAAAAAAAA-3’
3’-TTTTTTTTT-5’
A13 5’-AAAAAAAAAAAAA-3’
3’-TTTTTTTTTTTTT-5’
G5 5’-GGGGG-3’
3’-CCCCC-5’
G9 5’-GGGGGGGGG-3’
3’-CCCCCCCCC-5’
G13 5’-GGGGGGGGGGGGG-3’
3’-CCCCCCCCCCCCC-5’
strongly. BothpolyAandpolyGDNAprobablyexhibitsomespecialproperties that
are not foundwith other (irregular) sequences though. Yet, they are undoubtedly
very different, and this provides a chance to see qualitativelywhat the sequence-
relatedeffects in such short oligonucleotides are.
Therefore, subject of thefirst study (chapter4) arepoly-adenine andpoly-guanine
double-strandedhelicalDNAspecies, containingfive,nineand13basepairs; every
specieswas cappedwith twoGCbase pairs on each end. Note that 13 base pairs
correspond to slightlymore than one complete helical turn in the B-DNAconfor-
mation. So, there are six dsDNAspecies in the first part, see table 3.1. Note that
thepolyADNAspeciesareunlikely tobe thermodynamically stableundernormal
conditions. However, suchA-tractsmayoccuras fragmentswithin longerdsDNA,
and the cappingGCbase pairs act as stabilizers of the double-stranded structure
here.
In theproceedingchapters, anewsetofDNAsequenceswillbe introduced.As the
general featuresof theDNAstructureundermechanical stressandmicrohydration
43
Charge Transport in DNA
Insights from Simulations
- Title
- Charge Transport in DNA
- Subtitle
- Insights from Simulations
- Author
- Mario Wolter
- Publisher
- KIT Scientific Publishing
- Date
- 2013
- Language
- English
- License
- CC BY-SA 3.0
- ISBN
- 978-3-7315-0082-7
- Size
- 17.0 x 24.0 cm
- Pages
- 156
- Keywords
- Charge Transport, Charge Transfer, DNA, Molecular Dynamics, Quantum Mechanics
- Categories
- Naturwissenschaften Chemie
Table of contents
- Zusammenfassung 1
- Summary 3
- 1 Introduction 5
- 2 TheoreticalBackground 11
- 3 SimulationSetup 39
- 4 DNAUnderExperimentalConditions 49
- 5 ChargeTransport inStretchedDNA 69
- 6 ChargeTransport inMicrohydratedDNA 79
- 7 AParametrizedModel toSimulateCT inDNA 89
- 8 Conclusion 105
- Appendix 111
- A DNAUnderExperimentalConditions 111
- B CTinMicrohydratedDNA 117
- List ofPublications 137