Changing functionality of surfaces by directed self-assembly using oligonucleotides--the Oligo-Tag.

Area of Science:

• Biotechnology
• Surface Chemistry
• Molecular Biology

Background:

• Traditional surface modification methods can lack specificity and reversibility.
• There is a need for adaptable surfaces in biotechnological applications, such as DNA arrays.
• Oligonucleotide-based strategies offer potential for precise molecular conjugation.

Purpose of the Study:

• To develop and demonstrate a novel method for surface modification using oligonucleotides as tags.
• To enable specific and reversible attachment of diverse functionalities to sensing surfaces.
• To create regenerable biosensing platforms for biotechnological applications.

Main Methods:

• Covalent coupling of oligonucleotides to a pre-activated surface.
• Hybridization of complementary oligonucleotides conjugated with specific functionalities (haptens).
• Demonstration using an optical waveguide grating coupler and antibody-recognized haptens (2,4-dichlorophenoxyacetic acid, atrazine).

Main Results:

• Successfully created surfaces with specifically and reversibly attached functionalities via Oligo-Tags.
• Demonstrated the versatility of the method by functionalizing an optical waveguide grating coupler.
• Achieved complete surface regeneration through alkaline washing or temperature increase without loss of binding capacity.
• Confirmed specificity through competitive binding assays and observed no unspecific binding.

Conclusions:

• The Oligo-Tag method provides a robust and versatile approach for surface modification in biotechnology.
• This technique allows for the transformation of existing arrays (e.g., DNA arrays) into platforms for arbitrary ligands.
• The developed biosensing surfaces are highly specific, regenerable, and suitable for various biotechnological applications.