Nucleophilic properties of purine bases: inherent reactivity versus reaction conditions

A Stachowicz-Kuśnierz, J Korchowiec - Structural Chemistry, 2016 - Springer
In the present study, nucleophilic properties of adenine and guanine are examined by
means of density functional theory. H+ is used as a model electrophile. Two modes of H+ …

Methylation of graphene (pristine and S-doped) by carcinogenic methane diazonium ion: a DFT study

BI Laskar, PK Shukla - Molecular Simulation, 2023 - Taylor & Francis
Herein, we aim to explore the efficiency of graphene in scavenging the carcinogenic
methane diazonium ions (CH3N2+) which are capable of methylating DNA and other …

Role of graphene in scavenging methyl cations: a DFT study

BI Laskar, AK Mishra, PK Shukla - Journal of Molecular Modeling, 2023 - Springer
Context It is known that methylating agents methylate DNA by transferring a methyl cation
(CH3+) to the nucleophilic sites in DNA bases and DNA methylation is implicated in cancer …

A DFT study of reactions of methyldiazonium ion with DNA/RNA nucleosides: investigating effect of sugar moiety on methylation pattern of bases

K Bhattacharjee, PK Shukla - International Journal of Quantum …, 2014 - Wiley Online Library
Methyldiazonium ion () is an ultimate carcinogen that can methylate multiple sites in
DNA/RNA. In present contribution, density functional theory calculations using the B3LYP …

Mechanism of methylation of 8-oxoguanine due to its reaction with methyldiazonium ion

K Bhattacharjee, PC Mishra, PK Shukla - Molecular Simulation, 2017 - Taylor & Francis
Anticancer drugs such as temozolomide (TMZ) and decarbazine (DTIC) and several
detrimental methylating agents methylate DNA via the formation of methyldiazonium ion () …

A theoretical investigation of the activation barriers for the N3-adenine methylation by carcinogenic methane diazonium ion

MV Yermolina, A Ali, A Cabrera… - Computational and …, 2022 - Elsevier
Abstract Density Functional Theory calculations at the B3LYP-D3/6-311+ G* level of theory
yield for the methylation of adenine by the carcinogenic methane diazonium ion at the N3 …

Free energy profiles for two ubiquitous damaging agents: methylation and hydroxylation of guanine in B-DNA

R Grüber, J Aranda, A Bellili, I Tuñón… - Physical Chemistry …, 2017 - pubs.rsc.org
DNA methylation and hydroxylation are two ubiquitous reactions in DNA damage induction,
yet insights are scarce concerning the free energy of activation within B-DNA. We resort to …

A Density Functional Theory Study of Methylation Reactions of CH3N+ 2 with Guanylate and Deoxyguanylate

K Bhattacharjee, PK Shukla - Advanced Science Letters, 2015 - ingentaconnect.com
We study here theoretically the methylation reactions of CH3N+ 2 at the N7 site of guanine
of the deoxyguanylate (deoxyguanosine 5'-monophosphate (dGMP)) and deoxyguanylate …

Methylation of DNA bases by methyl free radicals: mechanism of formation of C8-methylguanine

S Biswas, PK Shah, PK Shukla - Structural Chemistry, 2018 - Springer
Abstract The C8-methylguanine (C8mG) lesions are reported to be produced in vivo due to
methylation of guanine base of DNA by methyl free (· CH 3) radicals derived from the …

[PDF][PDF] A DFT Study of Methylation Reactions of CH3N2 with Guanylate and Deoxyguanylate

K Bhattacharjee, PK Shukla - researchgate.net
We study here theoretically the methylation reactions of CH3N2+ at the N7 site of guanine of
the deoxyguanylate (deoxyguanosine 5'-monophosphate (dGMP)) and guanylate …