Charge-Tagged Nucleosides in the Gas Phase: UV–Vis Action Spectroscopy and Structures of Cytidine Cations, Dications, and Cation Radicals
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F21%3A00544512" target="_blank" >RIV/61388963:_____/21:00544512 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1021/acs.jpca.1c03477" target="_blank" >https://doi.org/10.1021/acs.jpca.1c03477</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.jpca.1c03477" target="_blank" >10.1021/acs.jpca.1c03477</a>
Alternative languages
Result language
angličtina
Original language name
Charge-Tagged Nucleosides in the Gas Phase: UV–Vis Action Spectroscopy and Structures of Cytidine Cations, Dications, and Cation Radicals
Original language description
Cytidine ribonucleosides were furnished at O5′ with fixed-charge 6-trimethylammoniumhexan-1-aminecarbonyl tags and studied by UV–vis photodissociation action spectroscopy in the gas phase to probe isolated nucleobase chromophores in their neutral, protonated, and hydrogen-adduct radical forms. The action spectrum of the doubly charged cytidine conjugate showed bands at 310 and 270 nm that were assigned to the N3- and O2-protonated cytosine tautomers formed by electrospray, respectively. In contrast, cytidine conjugates coordinated to dibenzo-18-crown-6-ether (DBCE) in a noncovalent complex were found to strongly favor protonation at N3, forming a single-ion tautomer. This allowed us to form cytidine N3–H radicals by electron transfer dissociation of the complex and study their action spectra. Cytidine radicals showed only very weak absorption in the visible region of the spectrum for dipole-disallowed transitions to the low (A and B) excited states. The main bands were observed at 360, 300, and 250 nm that were assigned with the help of theoretical vibronic spectra obtained by time-dependent density functional theory calculations of multiple (>300) radical vibrational configurations. Collision-induced dissociations of cytidine radicals proceeded by major cleavage of the N1–C1′ glycosidic bond leading to loss of cytosine and competitive loss of N3-hydrogen atom. These dissociations were characterized by calculations of transition-state structures and energies using combined Born–Oppenheimer molecular dynamics and DFT calculations. Overall, cytidine radicals were found to be kinetically and thermodynamically more stable than previously reported analogous adenosine and guanosine radicals.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10406 - Analytical chemistry
Result continuities
Project
<a href="/en/project/LTAUSA19094" target="_blank" >LTAUSA19094: Electron and proton transfer in ionized DNA fragments</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Physical Chemistry A
ISSN
1089-5639
e-ISSN
1520-5215
Volume of the periodical
125
Issue of the periodical within the volume
28
Country of publishing house
US - UNITED STATES
Number of pages
13
Pages from-to
6096-6108
UT code for WoS article
000677580900007
EID of the result in the Scopus database
2-s2.0-85111297329