Proton/Hydrogen Transfer Mechanisms in the Guanine-Cytosine Base Pair: Photostability and Tautomerism

Author(s)

Sauri, Vicenta ^[1] ; Gobbo, Joao P. ^{[2, 3]} ; Serrano-Perez, Juan J. ^[4] ; Lundberg, Marcus ^[5] ; Coto, Pedro B. ^{[1, 6, 7]} ; Serrano-Andres, Luis ^[1] ; Borin, Antonio C. ^{[2, 3]} ; Lindh, Roland ^[5] ; Merchan, Manuela ^[1] ; Roca-Sanjuan, Daniel ^[5]

Affiliation

^[1] Univ Valencia, Inst Ciencia Mol, ES-46071 Valencia - Spain

^[2] Univ Sao Paulo, Inst Quim, BR-05508900 Sao Paulo - Brazil

^[3] USP Consortium Photochem Technol, NAPPhotoTech, BR-05508900 Sao Paulo - Brazil

^[4] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ - England

^[5] Uppsala Univ, Theoret Chem Program, Dept Chem Angstrom, SE-75120 Uppsala - Sweden

^[6] Univ Erlangen Nurnberg, Inst Theoret Phys, D-91058 Erlangen - Germany

^[7] Univ Alcala de Henares, Dept Quim Fis, E-28871 Alcala De Henares - Spain

• Document type: Journal article
• Source: JOURNAL OF CHEMICAL THEORY AND COMPUTATION; v. 9, n. 1, p. 481-496, JAN 2013.
• Web of Science Citations: 26

Abstract

Proton/hydrogen-transfer processes have been broadly studied in the past 50 years to explain the photostability and the spontaneous tautomerism in the DNA base pairs. In the present study, the CASSCF/CASPT2 methodology is used to map the two-dimensional potential energy surfaces along the stretched NH reaction coordinates of the guanine-cytosine (GC) base pair. Concerted and stepwise pathways are explored initially in vacuo, and three mechanisms are studied: the stepwise double proton transfer, the stepwise double hydrogen transfer, and the concerted double proton transfer. The results are consistent with previous findings related to the photostability of the GC base pair, and a new contribution to tautomerism is provided. The C-based imino-oxo and imino-enol GC tautomers, which can be generated during the UV irradiation of the Watson-Crick base pair, have analogous radiationless energy-decay channels to those of the canonical base pair. In addition, the C-based imino-enol GC tautomer is thermally less stable. A study of the GC base pair is carried out subsequently taking into account the DNA surroundings in the biological environment. The most important stationary points are computed using the quantum mechanics/molecular mechanics (QM/MM) approach, suggesting a similar scenario for the proton/hydrogen-transfer phenomena in vacuo and in DNA Finally, the static model is complemented by ab initio dynamic simulations, which show that vibrations at the hydrogen bonds can indeed originate hydrogen-transfer processes in the GC base pair. The relevance of the present findings for the rationalization of the preservation of the genetic code and mutagenesis is discussed. (AU)

• FAPESP's process: 10/16043-2 - Photophysics of analogous of nucleic acid bases
• Grantee: Joao Paulo Gobbo
• Support type: Scholarships in Brazil - Post-Doctorate