Label-free detection of single-stranded DNA binding protein based on a cantilever array

Area of Science:

• Biotechnology
• Biosensing
• Nanotechnology

Background:

• Accurate detection of proteins like single-stranded DNA-binding protein (SSBP) is crucial for molecular biology research.
• Existing protein detection methods may lack sensitivity, specificity, or require labeling.

Purpose of the Study:

• To develop a simple, sensitive, and label-free method for detecting SSBP.
• To utilize microcantilever array technology for protein quantification.

Main Methods:

• Immobilizing single-stranded DNA (ssDNA) on microfabricated cantilever surfaces for SSBP detection.
• Employing reference cantilevers with 6-mercapto-1-hexanol to account for non-specific binding and environmental changes.
• Measuring differential cantilever deflection signals to quantify SSBP concentration.

Main Results:

• The cantilever array sensor demonstrated label-free detection of SSBP.
• Specific SSBP-ssDNA binding resulted in measurable cantilever deflection signals dependent on SSBP concentration.
• The sensor successfully detected SSBP within a concentration range of 0.01 to 7 μg mL(-1).
• Other proteins like thrombin and bovine serum albumin did not induce significant deflection, confirming specificity.

Conclusions:

• The developed cantilever array sensor system offers a highly sensitive and specific method for SSBP detection.
• This technology shows significant potential as a powerful tool for protein analysis in various applications.
• Label-free detection simplifies the assay process and reduces potential experimental errors.