Volume 216, 2019

Role of charge transfer states into the formation of cyclobutane pyrimidine dimers in DNA

Abstract

Photoinduced charge transfer between neighboring bases plays an important role in DNA. One of its important effects is shown in its ability to affect the photochemical yields of the formation of cyclobutane pyrimidine dimer (CPD) products between adjacent pyrimidine bases. In this work we examine how the energies of charge transfer states depend on the sequences of oligonucleotides using a hybrid quantum and molecular mechanics (QM/MM) methodology combined with the algebraic diagrammatic construction through a second order electronic structure method for excited states. Specifically, we examine 10 sequences with guanine being on the 5′ or 3′ position of two pyrimidine bases. The results show that the energies of charge transfer states are affected by the nature of the donor acceptor pair, by the distance between them, and by other electrostatic effects created by the surrounding environment.

Graphical abstract: Role of charge transfer states into the formation of cyclobutane pyrimidine dimers in DNA

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Article information

Article type
Paper
Submitted
17 ኖቬም 2018
Accepted
05 ዲሴም 2018
First published
05 ዲሴም 2018

Faraday Discuss., 2019,216, 507-519

Author version available

Role of charge transfer states into the formation of cyclobutane pyrimidine dimers in DNA

W. Lee and S. Matsika, Faraday Discuss., 2019, 216, 507 DOI: 10.1039/C8FD00184G

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