8-oxo-7,8-dihydro-2′-dexyoguanine (8-oxo-dG) can be tautomerized to a 6-enolate,8-keto tautomer through nearby-NH deprotonation at elevated pH. In this work, the N3-protonated 8-oxo-dG tautomers in deuterated pH-buffer solutions were studied using steady-state UV/Vis, FTIR, and ultrafast two-dimensional IR spectroscopies. The presence of 6,8-diketo and C6-anionic tautomers at neutral to basic conditions (pD = 7.4–12.0) was revealed by UV/Vis and FTIR results and was further confirmed by 2D IR signals in both diagonal and off-diagonal regions. However, the C6-enol tautomer, which may be an intermediate during the transition from 6,8-diketo to C6-enolate,C8-keto, was not observed appreciably due to its extreme low population. Furthermore, the neutral-to-anionic tautomeric transition of N3H-8-oxo-dG studied in this work occurs under more basic conditions than the N1H-8-oxo-dG reported previously, showing a higher pKa value for N3H than N1H. Finally, vibrational relaxation of the carbonyl stretching mode was found to be both molecular site dependent and pD dependent for 8oxo-dG. Taken together, this work shows that the ultrafast infrared spectroscopic method is effective for examining tautomers and their dynamics in nucleic acids.
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14 July 2024
Research Article|
July 08 2024
Structures and dynamics of 8-oxo-7,8-dihydro-2′-deoxyguanosine in neutral and basic aqueous solutions by spectroscopy
Special Collection:
Time-resolved Vibrational Spectroscopy
Guixiu Wang
;
Guixiu Wang
a)
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Project administration, Writing – original draft, Writing – review & editing)
1
Department of Marine Technology, Rizhao Polytechnic
, Yantai North Road, 16, Rizhao, Shandong Province 276800, People’s Republic of China
2
Beijing National Laboratory for Molecular Sciences, Molecular Reaction Dynamics Laboratory, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences
, Beijing 100190, People’s Republic of China
a)Author to whom correspondence should be addressed: [email protected]. G. Wang was a visiting scientist at ICCAS.
Search for other works by this author on:
Pengyun Yu
;
Pengyun Yu
b)
(Formal analysis, Investigation, Writing – original draft)
2
Beijing National Laboratory for Molecular Sciences, Molecular Reaction Dynamics Laboratory, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences
, Beijing 100190, People’s Republic of China
3
University of Chinese Academy of Sciences
, Beijing 100049, People’s Republic of China
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Jianping Wang
Jianping Wang
c)
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Project administration, Writing – original draft, Writing – review & editing)
2
Beijing National Laboratory for Molecular Sciences, Molecular Reaction Dynamics Laboratory, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences
, Beijing 100190, People’s Republic of China
3
University of Chinese Academy of Sciences
, Beijing 100049, People’s Republic of China
c)Author to whom correspondence should be addressed: [email protected]
Search for other works by this author on:
a)Author to whom correspondence should be addressed: [email protected]. G. Wang was a visiting scientist at ICCAS.
c)Author to whom correspondence should be addressed: [email protected]
b)
Current address: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.
J. Chem. Phys. 161, 024201 (2024)
Article history
Received:
March 20 2024
Accepted:
June 15 2024
Citation
Guixiu Wang, Pengyun Yu, Jianping Wang; Structures and dynamics of 8-oxo-7,8-dihydro-2′-deoxyguanosine in neutral and basic aqueous solutions by spectroscopy. J. Chem. Phys. 14 July 2024; 161 (2): 024201. https://doi.org/10.1063/5.0209256
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