Spatial recognition and mapping of proteins using DNA aptamers.

Area of Science:

• Biophysics
• Molecular Biology
• Nanotechnology

Background:

• Atomic force microscopy (AFM) is crucial for biophysical analysis of biological systems.
• Detecting and mapping biomolecules on surfaces requires integrated imaging and force spectroscopy.
• The selection of biomolecular recognition probes is critical for experimental success.

Purpose of the Study:

• To demonstrate the use of oligonucleotide aptamers as versatile probes for AFM-based imaging and force spectroscopy.
• To spatially locate and identify specific proteins on surfaces.
• To investigate real-time changes in biomolecular binding within fluctuating microenvironments.

Main Methods:

• Utilized AFM-based adhesion force measurements and recognition mapping.
• Employed specific DNA aptamers as recognition probes for target proteins.
• Focused on human α-thrombin and vascular endothelial growth factor as model proteins.

Main Results:

• Achieved simultaneous height and force measurements with high consistency.
• Demonstrated aptamer specificity and target discrimination through controls.
• Observed real-time binding changes in response to environmental microenvironment variations.

Conclusions:

• Oligonucleotide aptamers are effective probes for simultaneous imaging and spatial localization of proteins.
• AFM-recognition mapping provides high-resolution maps for spatiotemporal protein identification.
• This method facilitates the study of dynamic biological systems at the molecular level on complex surfaces.