An Overview of DNA and RNA Bindings to Antioxidant Flavonoids |
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Authors: | C D Kanakis P A Tarantilis M G Polissiou S Diamantoglou H A Tajmir-Riahi |
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Institution: | (1) Laboratory of Chemistry, Department of Science, Agricultural University of Athens, 75 Iera Odos, 118 55 Athens, Greece;(2) Department of Chemistry-Biology, University of Québec at Trois-Rivières, Three Rivers, QC, Canada, G9A 5H7 |
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Abstract: | In this report we are examining how the antioxidant flavonoids can prevent DNA damage and what mechanism of action is involved
in the process. Flavonoids are strong antioxidants that prevent DNA damage. The anticancer and antiviral activities of these
natural products are implicated in their mechanism of actions. We study the interactions of quercetin (que), kaempferol (kae),
and delphinidin (del) with DNA and transfer RNA in aqueous solution at physiological conditions, using constant DNA or RNA
concentration 6.25 mmol (phosphate) and various pigment/polynucleotide(phosphate) ratios of 1/65 to 1 (DNA) and 1/48 to 1/8
(tRNA). The structural analysis showed quercetin, kaempferol, and delphinidin intercalate DNA and RNA duplexes with minor
external binding to the major or minor groove and the backbone phosphate group with overall binding constants for DNA adducts
K
que = 7.25 (±0.65) × 104 M−1, K
kae = 3.60 (±0.33) × 104 M−1, and K
del = 1.66 (±0.25) × 104 M−1 and for tRNA adducts K
que = 4.80 (±0.50) × 104 M−1, K
kae = 4.65 (±0.45) × 104 M−1, and K
del = 9.47 (±0.70) × 104 M−1. The stability of adduct formation is in the order of del>que>kae for tRNA and que>kae>del for DNA. Low flavonoid concentration
induces helical stabilization, whereas high pigment content causes helix opening. A partial B to A-DNA transition occurs at
high drug concentration, while tRNA remains in A-family structure. The antioxidant activity of flavonoids changes in order
delphinidin>quercetin>kaempferol. The results show intercalated flavonoids can make them strong antioxidants to protect DNA
from harmful free radical reactions. |
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Keywords: | DNA tRNA Antioxidant Flavonoids Binding sites Binding constant Conformation FT-IR UV– Visible spectroscopy |
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