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Author Spotlight: Characterizing DNA G-Quadruplex by Bis-3-Chloropiperidine Based Chemical Mapping
Published on: May 12, 2023
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Changes in physicochemical and anticancer properties modulated by chemically modified sugar moieties within
Carolina Roxo1, Anna Pasternak1
1Department of Nucleic Acids Bioengineering, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan, Poland.
Plos One
|August 23, 2022
Summary
Locked nucleic acid (LNA) and 2'-O-methyl-RNA (2'-O-Me-RNA) modifications enhance G-quadruplex anticancer activity, while unlock nucleic acid (UNA) primarily affects stability. These findings guide the design of novel G-quadruplex therapeutics.
Area of Science:
- Medicinal Chemistry
- Nucleic Acid Chemistry
- Biochemistry
Background:
- DNA G-quadruplexes are promising therapeutic targets due to their roles in various cellular processes.
- Modifications to nucleic acid residues can alter G-quadruplex properties, influencing their potential applications.
- Understanding how specific modifications impact G-quadruplexes is crucial for developing effective therapeutics.
Purpose of the Study:
- To systematically investigate the effects of locked nucleic acid (LNA), unlock nucleic acid (UNA), and 2 -O-methyl-RNA (2 -O-Me-RNA) residues on G-quadruplexes.
- To analyze the influence of these modifications on thermal stability, structure, biological activity, and enzymatic resistance.
- To determine the position-dependent effects of single-position substitutions within G-quadruplexes.
Main Methods:
- Synthesis and characterization of twenty-seven modified G-quadruplex variants with single-position substitutions.
- Analysis of thermal stability, structure folding topology, biological activity, and enzymatic resistance.
- Evaluation of physicochemical properties and antiproliferative potential of modified G-quadruplexes.
Main Results:
- Modification effects on G-quadruplex physicochemical properties are position-dependent due to interactions between G-tetrads and loops.
- Unlock nucleic acid (UNA) modifications effectively modulate thermodynamic stability but show limited anticancer activity.
- Locked nucleic acid (LNA) and 2 -O-methyl-RNA (2 -O-Me-RNA) modified G-quadruplexes exhibit antiproliferative potential.
Conclusions:
- Anticancer activity of modified G-quadruplexes is dictated by their structure and local sugar moiety changes.
- LNA and 2 -O-Me-RNA modifications represent viable strategies for designing G-quadruplex-based therapeutics.
- UNA modifications are useful for modulating stability but less so for enhancing anticancer properties.
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