Abstract
The electronic coupling V da is the parameter which determines most strongly how the charge-transfer rate between donor and acceptor depends on the distance between the sites and the mutual orientation of donor and acceptor moieties. We discuss quantum chemical procedures to estimate electronic coupling matrix elements of hole transfer in DNA. The two-state model was shown to be quite reliable when applied to the coupling between neighboring Watson–Crick pairs. However, one has to be careful when employing the two-state model to estimate V da in systems where donor and acceptor are separated by a bridge of base pairs. We considered the gross features of base-pair specificity, directional asymmetry, and conformation sensitivity of the couplings. Matrix elements between base pairs are found to be extremely sensitive to conformational changes of DNA. This strongly suggests that a combined QM/MD approach should be best suited for estimating V da within DNA fragments.
Comparison of the effective couplings mediated by π-stack bridges TBT and ABA (B=A, zA, G, T, C) demonstrate that the efficiency of charge transfer is considerably affected by the nature of B; in turn, the effect of B strongly depends on the neighboring pairs. Especially large effects are due to the variation of the oxidation potential of guanine and adenine (B=G, A). Chemical modification of these species or changes of their environment strongly influence the efficiency of charge transfer.
We conclude with a discussion of several open questions and problems concerning the calculation of electronic couplings in DNA-related systems.
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Abbreviations
- A, C, G, T :
-
Nucleobases adenine, cytosine, guanine, and thymine, respectively. In DNA duplexes A, C, G, T stand for the corresponding Watson–Crick pairs, e.g., G in the duplex GGG corresponds to the (GC) Watson–Crick pair
- z A :
-
7-Deazaadenine
- AM1 :
-
Austin Model 1
- AO :
-
Atomic orbital
- au :
-
Atomic units
- B3LYP :
-
Hybrid Becke-3-parameter exchange and Lee–Yang–Parr correlation approximation
- CNDO :
-
Complete neglect of differential overlap
- CSOV :
-
Constrained space orbital variation (analysis)
- CT :
-
Charge transfer
- DC :
-
Divide-and-conquer (strategy)
- DFT :
-
Density functional theory
- EA :
-
Electron affinity
- ET :
-
Electron transfer
- FC :
-
Thermally weighted Franck–Condon factor
- FCD :
-
Fragment charge difference (method)
- z G :
-
7-Deazaguanine
- GMH :
-
Generalized Mulliken–Hush (method)
- HF :
-
Hartree–Fock (method)
- HOMO :
-
Highest occupied molecular orbital
- INDO :
-
Intermediate neglect of differential overlap (method)
- IP :
-
Ionization potential
- MD :
-
Molecular dynamics
- MNDO :
-
Modified neglect of differential overlap (method)
- MNDO/d :
-
MNDO method, parameterization with d orbitals
- MO :
-
Molecular orbital
- NDDO :
-
Neglect of diatomic differential overlap (method)
- NDDO-G :
-
Special parameterization of the NDDO method
- NDDO-HT :
-
Parameterization of the NDDO method for hole transfer in DNA
- PM3 :
-
Parameterized Model 3
- QM/MD :
-
Hybrid quantum mechanics/molecular dynamics (method)
- SCF :
-
Self-consistent field (method)
- SFCD :
-
Simplified fragment charge difference (method)
- WCP :
-
Watson–Crick pair
- a :
-
Acceptor
- b :
-
Bridge
- d :
-
Donor
- k da :
-
Rate constant for charge transfer between donor and acceptor
- V da :
-
Effective coupling between donor and acceptor states
- H da :
-
Matrix element of Hamiltonian between diabatic donor and acceptor states
- S da :
-
Overlap integrals between donor and acceptor states
- Δ :
-
Energy gap between adiabatic states
- μ1, μ2:
-
Dipole moments of the ground state and the first excited states, respectively
- μ 12 :
-
Transition dipole moment
- β, βel:
-
Decay parameter of the rate constant, decay parameter due to electronic contributions, respectively
- λ, λi, λs:
-
Reorganization energy, internal and solvent contributions, respectively
- 6–31G* :
-
Gaussian basis set of so-called double-zeta quality for valence orbitals, augmented by polarization d-functions (*) on all atoms except hydrogen; used here to generate reference values of hole coupling matrix elements
- 6–311++G** :
-
Very flexible Gaussian basis set of triple-zeta quality for valence orbitals, augmented by two sets of diffuse exponents (++) on all atoms (except hydrogen) and polarization functions on all atoms; other symbols for basis sets are to be read accordingly
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Acknowledgements
We thank M. Bixon, J. Jortner, A. Marquez, M.E. Michel-Beyerle, M.D. Newton, J. Rak, and K. Siriwong for stimulating discussions and various contributions to the work described here. Our research was supported by Deutsche Forschungsgemeinschaft (SFB 377), Volkswagen Foundation, and Fonds der Chemischen Industrie.
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Rösch, N., Voityuk, A.A. Quantum Chemical Calculation of Donor–Acceptor Coupling for Charge Transfer in DNA. In: Schuster, G. (eds) Long-Range Charge Transfer in DNA II. Topics in Current Chemistry, vol 237. Springer, Berlin, Heidelberg. https://doi.org/10.1007/b94472
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DOI: https://doi.org/10.1007/b94472
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