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• W4200263443 abstract "Abstract In this study at the MP2/6-311++G(d,p)//B3LYP/6-311++G(d,p) level of theory in the isolated state it was revealed 14 novel physico-chemical mechanisms of the tautomerization of the G·C nucleotide base pairs in the Watson-Crick G·C(WC) / G*·C*(WC), reverse Watson-Crick G*·C*(rWC) / G·C* O2 (rWC), Hoogsteen G* t ·C*(H) / G* N7 ·C(H) or reverse Hoogsteen G* t ·C*(rH) / G* t N7 ·C(rH) configurations into the wobble (w WC , w H ) and reverse wobble (rw WC , rw Н ) base pairs: 1. G·C(WC)↔G·C*(rw WC ), 2./3. G*·C*(WC)↔G·C*(rw WC )/G* N2 ·C*(rw WC ), 4. G*·C*(rWC)↔G*·C(w WC ), 5. G·C* O2 (rWC)↔G·C*(w WC ); 6./7./8./9. G* t ·C*(H)↔G* t ·C(rw Н )/G* t ·C* O2 (w H )/G* t ·C* O2 (rw Н )/G* t N7 ·C*(rw Н )↔G* t ·C* O2 (rw Н ), 10. G* N7 ·C(H)↔G* t ·C(w H ) amino , 11./12. G* t ·C*(rH)↔G* N7 ·C*(w Н )/G* t ·C(w Н ), 13. G* t N7 ·C(rH)↔G* t N7 ·C*(w Н )↔G* t ·C(w Н ) and 14. G* N7 ·C*(rw H )↔G* N7 ·C*(rw H ) perp ↔G - ·C + (w H )↔G* t ·C(rw Н ) reaction pathways. It was established that the presence in the base pair of the two anti - parallel neighboring H-bonds is a necessary and sufficient condition for the implementation of such transformations, since it enables intermolecular proton transfer between the bases inside the base pair. It was found out that these tautomeric transitions are controlled by the TSs with quasi-orthogonal structure, which are tight G + ·C - /G - ·C + ion pairs, joined by at least two parallel intermolecular H-bonds, connected on a common negatively charged endocyclic N - /C - atoms – proton acceptor. All reaction pathways have been reliably confirmed. These transitions are accompanied by the changing of the mutual cis- orientation of the N9H and N1H glycosidic bonds of the bases on the trans- orientation and vice versa . These data complement the reported earlier mechanisms of the tautomerisations of the classical A·T and G·C DNA base pairs. Experimental verification of the novel G·C nucleobase pairs is looking as an attractive task for the future research." @default.
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• W4200263443 date "2021-12-03" @default.
• W4200263443 modified "2023-10-15" @default.
• W4200263443 title "Quantum Surprises from the Watson-Crick and Hoogsteen G·C Nucleobase Pairs: A Comprehensive QM/QTAIM Investigation" @default.
• W4200263443 doi "https://doi.org/10.21203/rs.3.rs-1109763/v1" @default.
• W4200263443 hasPublicationYear "2021" @default.
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