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Reversible pH-controlled DNA-binding peptide nanotweezers: an in-silico study
Gaurav Sharma1, Kaushal Rege, David E Budil
1Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA.
International Journal of Nanomedicine
|April 2, 2009
Summary
Engineered peptide nanotweezers reversibly open and close in response to pH changes. This pH-actuated movement enables modulation of DNA-binding activity, with implications for bioseparations and novel transcription factor design.
Area of Science:
- Biomolecular Engineering
- Nanotechnology
- Structural Biology
Background:
- The GCN4 leucine zipper peptide (GCN4-p1) serves as a model for alpha-helical coiled-coil structures.
- Stimuli-responsive materials are crucial for developing advanced functional devices.
Purpose of the Study:
- To engineer mutant peptides based on GCN4-p1 for creating environmentally-responsive nanotweezers.
- To investigate the pH-induced actuation mechanism and reversibility of these nanotweezers.
Main Methods:
- Molecular dynamics (MD)-aided design of mutant peptides.
- Characterization of coiled-coil peptide conformational properties and structural stability.
- pH-dependent actuation studies.
Main Results:
- Mutant peptides exhibited reversible opening up to 15 Å (1.5 nm) upon pH modulation.
- A closed-open-closed transition cycle was achieved by altering solution pH.
- Demonstrated environmentally responsive modulation of DNA-binding activity using engineered nanotweezers.
Conclusions:
- A rational design approach is essential for engineering stable, stimuli-responsive peptide-based devices.
- The developed nanotweezers have potential applications in bioseparations and synthetic biology.
- This work highlights the utility of peptide engineering for creating novel functional nanomaterials.
