Publication details
Photoinduced water-chromophore electron transfer causes formation of guanosine photodamage
| Authors | |
|---|---|
| Year of publication | 2022 |
| Type | Article in Periodical |
| Magazine / Source | Physical Chemistry Chemical Physics |
| MU Faculty or unit | |
| Citation | |
| Web | https://pubs.rsc.org/en/content/articlelanding/2022/cp/d2cp00801g |
| Doi | http://dx.doi.org/10.1039/d2cp00801g |
| Keywords | 2ND-ORDER PERTURBATION-THEORY; INDUCED DNA-DAMAGE; GUANINE DERIVATIVES; MAJOR PRODUCTS; BASIS-SETS; UV; DYNAMICS; STATE; PHOTOCHEMISTRY; ABSORPTION |
| Description | UV-induced photolysis of aqueous guanine nucleosides produces 8-oxo-guanine and Fapy-guanine, which can induce various types of cellular malfunction. The mechanistic rationale underlying photodestructive processes of guanine nucleosides is still largely obscure. Here, we employ accurate quantum chemical calculations and demonstrate that an excited-state non-bonding interaction of guanosine and a water molecule facilitates the electron-driven proton transfer process from water to the chromophore fragment. This subsequently allows for the formation of a crucial intermediate, namely guanosine photohydrate. Further (photo)chemical reactions of this intermediate lead to the known products of guanine photodamage. |