A sol-gel-integrated protein array system for affinity analysis of aptamer-target protein interaction

Area of Science:

• Biotechnology
• Biochemistry
• Materials Science

Background:

• Traditional 2D microarray surfaces have limitations in dynamic range and protein presentation.
• Sol-gel technology offers a more versatile matrix for immobilizing biomolecules.
• Protein-aptamer interactions are crucial for diagnostics and therapeutics.

Purpose of the Study:

• To develop and evaluate a sol-gel microarray system for protein interaction assays.
• To assess the utility of this system for aptamer binding affinity analysis.
• To establish a high-throughput method for aptamer screening.

Main Methods:

• Development of a sol-gel microarray system for protein immobilization.
• Utilizing yeast TATA-binding protein (TBP) and six RNA aptamers for evaluation.
• Incubation of Cy-3 labeled aptamers with TBP-spotted sol-gel arrays.
• Calculation of dissociation constants (Kd) via fluorescence intensity measurements.

Main Results:

• The sol-gel microarray system demonstrated high activity for protein interaction assays.
• Binding affinity measurements for aptamers showed good agreement with conventional methods (e.g., electric mobility shift assay).
• A control aptamer exhibited a Kd value of 8 nM, consistent with established data.

Conclusions:

• The sol-gel-integrated protein array is a viable alternative to conventional binding affinity measurement methods.
• This system facilitates simple, high-throughput screening of high-affinity aptamers.
• The developed microarray platform holds promise for advancing aptamer-based research and applications.