The influence of phosphorothioate on charge migration in single and double stranded DNA: a theoretical approach
Literature Information
In this study the influence of the phosphorothioate internucleotide bond on the electronic properties of single and double-stranded short nucleotides has been investigated at the M06-2X/6-31+G** level of theory in the gaseous phase. Due to the chirality of the phosphorus atom in a phosphorothioate (PT) internucleotide diester bond, the adiabatic/vertical mode of electron affinity/ionization potential, spin density and molecular orbital distribution, as well as structural analysis were taken under consideration for the single stranded (ss) RP and SP diastereomers of d[GPSG] and for double stranded (ds) d[GPSG]*d[CPOC], in comparison with the corresponding parent phosphate compounds. Moreover, the excitation states, HOMO and LUMO energies were calculated using a TD-DFT methodology at the M06-2X/6-31+G**//M06-2X/6-31++G** level of theory in the aqueous phase. The obtained results show that the PT plays a significant role in the case of ss-oligonucleotides, and to a much smaller extent in ds-oligomers.
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