Cover Feature: OH Radical-Induced Oxidation in Nucleosides and Nucleotides Unraveled by Tandem Mass Spectrometry and Infrared Multiple Photon Dissociation Spectroscopy

11 December 2023 par rédacteur
Yining Jiang, Carine Clavaguéra, Chantal Houée-Levin, Debora Scuderi et leurs collaborateurs ont récemment publié un article dans ChemPhysChem choisi pour représenter l'image de couverture du numéro

The Cover Feature illustrates the characterization by infrared multiple photon dissociation (IRMPD) spectroscopy of oxidative lesions in DNA model systems induced by •OH. IRMPD spectroscopy is performed using IR free-electron lasers (IR FEL). Diagnostic features have been identified by comparing the IRMPD spectra of the non-oxidized and oxidized compounds. Results have shown that the addition of one oxygen atom occurs on the nucleobase moiety. More information can be found in the Research Article by Debora Scuderi and co-workers:

"OH Radical-Induced Oxidation in Nucleosides and Nucleotides Unraveled by Tandem Mass Spectrometry and Infrared Multiple Photon Dissociation Spectroscopy"

Abstract

OH⋅-induced oxidation products of DNA nucleosides and nucleotides have been structurally characterized by collision-induced dissociation tandem mass spectrometry (CID-MS2) and Infrared Multiple Photon Dissociation (IRMPD) spectroscopy. CID-MS2 results have shown that the addition of one oxygen atom occurs on the nucleobase moiety. The gas-phase geometries of +16 mass increment products of 2’-deoxyadenosine (dA(O)H+), 2’-deoxyadenosine 5’-monophosphate (dAMP(O)H+), 2’-deoxycytidine (dC(O)H+), and 2’-deoxycytidine 5’-monophosphate (dCMP(O)H+) are extensively investigated by IRMPD spectroscopy and quantum-chemical calculations. We show that a carbonyl group is formed at the C8 position after oxidation of 2’-deoxyadenosine and its monophosphate derivative. For 2’-deoxycytidine and its monophosphate derivative, the oxygen atom is added to the C5 position to form a C−OH group. IRMPD spectroscopy has been employed for the first time to provide direct structural information on oxidative lesions in DNA model systems.

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