Narumol Phosrithong. Molecular modelings of chromone derivatives as anti free radical anticancer and anti avian myeloblastosis virus-reverse transcriptase agents. Doctoral Degree(Pharmaceutical Chemistry and Phytochemistry ). Mahidol University. Mahidol University Library and Knowledge Center. : Mahidol University, 2010.
Molecular modelings of chromone derivatives as anti free radical anticancer and anti avian myeloblastosis virus-reverse transcriptase agents
Abstract:
The antioxidant activity of previously synthesized chromone compounds were
determined using DPPH free radical scavenging assay, ferrous ions (Fe2+) chelating activity
test, total antioxidant activity test using FTC and TBA methods and total reductive capability
using the potassium ferricyanide reduction method. Chromone compound 32 was the most
active antioxidant with the IC50 of 4.92 μM for DPPH and 60.06 μM for Fe2+ chelating
activity test. The pIC50 from DPPH and Fe2+ chelating assays were subjected to the 3DQSAR
study using CoMFA and CoMSIA techniques. The best CoMFA model using DPPH
assay and Gaussian optimized conformers gave the best q2 of 0.821 for six components (non
cross-validated r2of 0.987, F of 388.255 and S of 0.095). The best CoMSIA model using
DPPH assay and superimposition alignment gave q2 of 0.876 with optimum number of
components of 6 (a non cross-validated r2 of 0.976, S of 0.129 and F of 208.073), including
electrostatic, hydrophobic, hydrogen bond donor and acceptor fields.
Docking studies of the plant-derived compounds and the synthesized chromones
were performed using the AutoDock program to determine the potential primary molecular
target(s) for their anticancer activity. The docking results revealed that lupeol and chromone
compound 32 exhibited better binding interaction to CDK-2 and Bcl-2 than the known CDK-
2 and Bcl-2 inhibitors. Epigallocatechin gallate (EGCG) was found to bind to CDK-6 with
tighter interaction than several reported CDK-6 inhibitors. Chromone compound 39 has been
shown to dock with CDK-6 better than other chromone derivatives. Flavopiridol bound best
to DNA topoisomerase I and catechin was best docked with topoisomerase II and VEGFR-2.
Chromone compound 47 was best docked with topoisomerase I and II and chromone
compound 24 showed good binding interaction with VEGFR-2. Quercetin and chromone
compound 15 showed good binding interaction with telomere: G-quadruplex.
CoMFA and CoMSIA studies of the flavonoid compounds which have been
reported to possess in vitro AMV-RT inhibitory action were carried out. The docking
simulations of these flavonoids with the HIV1-RT inhibitory activity were also performed to
compare the structural features required for both RTs. The field fit alignment gave the best
CoMFA and CoMSIA models with q2 of 0.665 and 0.685, respectively. The binding
interaction of scutellarein (the most active AMV-RT inhibitor) with HIV-RT corresponded
with the SAR of flavonoid compounds as AMV-RT inhibitor. Therefore, AMV-RT inhibitor
might display potent HIV-1 RT inhibitory activity as well