Assay of DNA-binding proteins with a dsDNA-coupled plate

Area of Science:

• Biochemistry
• Molecular Biology
• Assay Development

Background:

• Studying DNA-binding proteins (DBPs) is crucial for understanding gene regulation.
• Existing methods for DBP analysis can be complex and costly.

Purpose of the Study:

• To fabricate a cost-effective dsDNA-coupled plate (dcPlate).
• To apply the dcPlate for measuring DBP abundance and DNA-binding activity.
• To establish a high-throughput method for DBP characterization.

Main Methods:

• Fabrication of the dcPlate via covalent immobilization of amino-modified oligonucleotides.
• Application of the dcPlate in a four-step immunoassay: protein incubation, primary antibody binding, secondary antibody binding, and colorimetric development.
• Quantification of DBP abundance and assessment of DNA-binding activity.

Main Results:

• The dcPlate successfully detected three purified DBPs (NF-kappaB, AP1, SP1) and DBP in HeLa cell nuclear extract.
• Assays demonstrated the quantitative measurement of DBP abundance.
• The dcPlate effectively assayed the DNA-binding activity of NF-kappaB p50 to various DNA sequences in a high-throughput format.

Conclusions:

• The homemade dcPlate is a cost-effective solution for DBP research.
• The dcPlate offers a simple and versatile platform for studying DBPs.
• This method facilitates high-throughput analysis of DBP abundance and DNA-binding activity.