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 …

O6-methylguanine repair by O6-alkylguanine-DNA alkyltransferase

NR Jena, PK Shukla, HS Jena… - The journal of physical …, 2009 - ACS Publications
O6-Alkylguanine-DNA alkyltransferase (AGT) repairs O6-methylguanine (O6mG) in DNA
that is known to cause mutation and cancer. On the basis of calculations performed using …

QM/MM Study on the Reaction Mechanism of O6-Alkylguanine−DNA Alkyltransferase

Q Hou, L Du, J Gao, Y Liu, C Liu - The Journal of Physical …, 2010 - ACS Publications
Combined quantum-mechanical/molecular-mechanical (QM/MM) approaches have been
applied to investigate the detailed reaction mechanism of human O6-alkylguanine− DNA …

Repair of O6-methylguanine to guanine by cysteine in the absence and presence of histidine and by cysteine thiolate anion: a quantum chemical study

PK Shukla, PC Mishra - Physical Chemistry Chemical Physics, 2009 - pubs.rsc.org
O6-methylguanine (O6mG) is known to be a potential mutagenic modification of guanine as
it mispairs with thymine in DNA and causes GC to AT transversion mutation. It is …

A quantum chemical study of reactions of DNA bases with sulphur mustard: a chemical warfare agent

PK Shukla, PC Mishra - Theoretical Chemistry Accounts, 2010 - Springer
Reactions of the sulphonium ion of sulphur mustard (SM+ 1) at the N7, N3 and O6 sites of
guanine, N7, N3 and N1 sites of adenine, O2 and N3 sites of cytosine and O2 and O4 sites …

A quantum theoretical study of reactions of methyldiazonium ion with DNA base pairs

PK Shukla, V Ganapathy, PC Mishra - Chemical Physics, 2011 - Elsevier
Methylation of the DNA bases in the Watson–Crick GC and AT base pairs by the
methyldiazonium ion was investigated employing density functional and second order …

Base pairing patterns of DNA base lesion spiroiminodihydantoin: A DFT study

PK Shukla, PC Mishra - International Journal of Quantum …, 2013 - Wiley Online Library
The DNA base lesion spiroiminodihydantoin (Sp) is produced in biological systems
endogenously and can cause mutation and cancer. It is considered to be more mutagenic …

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 () …

DNA lesions caused by ROS and RNOS: A review of interactions and reactions involving guanine

PK Shukla, PC Mishra - Practical Aspects of Computational Chemistry …, 2010 - Springer
DNA is constantly attacked by a large number of endogenous and exogenous reactive
oxygen species (ROS), reactive nitrogen oxide species (RNOS), and alkylating agents which …