Related Experiment Video
Updated: Jun 23, 2025
14:28
Peptide-based Identification of Functional Motifs and their Binding Partners
Published on: June 30, 2013
12.4K
A non-B DNA binding peptidomimetic channel alters cellular functions
Raj Paul1, Debasish Dutta1, Titas Kumar Mukhopadhyay1
1School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata, 700032, India.
Nature Communications
|June 20, 2024
Summary
A novel thiazole-based peptide mimic, TBP2, forms ion channels in cell membranes, stabilizing G-quadruplex DNA structures. This process elevates intracellular cations, leading to cancer cell death via G-quadruplex stabilization.
Area of Science:
- Biochemistry and Biophysics
- Molecular Biology
- Nanotechnology
Background:
- DNA binding transcription factors can interact with lipid membranes to form ion channels.
- G-quadruplex (G4) DNA structures are important in cellular processes and cancer biology.
- Developing synthetic molecules that mimic biological functions is a key area of research.
Purpose of the Study:
- To develop a thiazole-based peptide mimic (TBP2) that forms transmembrane ion channels.
- To investigate TBP2's ability to influence cellular ion concentration and stabilize G-quadruplex DNA structures.
- To explore TBP2 as a potential therapeutic agent for cancer treatment.
Main Methods:
- Synthesis and characterization of the thiazole-based peptide mimic TBP2.
- Formation of TBP2 nanostructures (vesicles, nanofibers).
- Measurement of ion transport (Na+, K+) across lipid membranes using TBP2.
- Confocal microscopy to track TBP2 localization in cell membranes and nuclei.
- Assessment of G-quadruplex DNA stability and cancer cell viability.
Main Results:
- TBP2 self-assembles into nanostructures and forms transmembrane ion channels with high conductance (~0.6 nS) for Na+ and K+.
- TBP2 exhibits fluorescence upon membrane or nuclear incorporation and localizes to cancer cell nuclei.
- TBP2 induces elevated intracellular cation levels and enhances G-quadruplex DNA stability.
- The combined effects of TBP2 lead to synergistic G4 stabilization and cancer cell death.
Conclusions:
- TBP2 effectively mimics DNA binding transcription factors by forming ion channels and influencing G-quadruplex structures.
- TBP2's ability to localize in cancer cell nuclei and modulate ion concentrations offers a novel therapeutic strategy.
- This study presents a platform for mimicking biological functions, paving the way for innovative cancer therapies.
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