Natural and synthetic G-quadruplex interactive berberine derivatives

Area of Science:

• Medicinal Chemistry
• Molecular Biology
• Biochemistry

Background:

• G-quadruplex DNA structures are non-canonical DNA motifs implicated in various cellular processes.
• Telomerase is a crucial enzyme for maintaining telomere length, and its inhibition is a target for cancer therapy.
• Natural alkaloids and synthetic derivatives are explored for their potential therapeutic applications, including anticancer properties.

Purpose of the Study:

• To investigate the interaction of the natural alkaloid berberine with different G-quadruplex DNA structures.
• To compare the G-quadruplex binding and telomerase inhibitory effects of berberine with a synthetic piperidino derivative and coralyne.
• To elucidate the structural determinants responsible for the selective binding of these molecules to G-quadruplex DNA.

Main Methods:

• Spectroscopic techniques (e.g., UV-Vis, fluorescence) to study DNA binding.
• Biophysical assays to assess telomerase inhibition.
• Comparative analysis of binding affinities and inhibitory concentrations.

Main Results:

• Berberine, the synthetic piperidino derivative, and coralyne demonstrated selectivity for G-quadruplex DNA over duplex DNA.
• The aromatic moieties of these compounds were identified as critical for their G-quadruplex binding.
• Evidence of telomerase inhibition by these molecules was observed, correlating with their G-quadruplex interaction.

Conclusions:

• Berberine and its analogs are promising G-quadruplex DNA binders with potential as telomerase inhibitors.
• The aromatic system is a key pharmacophore for achieving selectivity towards G-quadruplex DNA.
• Further studies are warranted to explore the therapeutic potential of these compounds in oncology.