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Covalent attachment of oligonucleotides to solid supports
Nucleic Acids Research
|July 10, 1987
Summary
Researchers determined covalent attachment efficiencies for oligonucleotides to solid supports. Alkyl-amino and carboxyl supports showed high attachment, with carboxyl supports offering reduced non-covalent binding and improved end-attachment specificity.
Area of Science:
- Bioconjugation Chemistry
- Solid-Phase Synthesis
- Oligonucleotide Immobilization
Background:
- Covalent attachment of oligonucleotides to solid supports is crucial for applications like DNA sequencing and diagnostics.
- Controlled pore glass (CPG) and Sephacryl are common solid supports used in oligonucleotide synthesis.
- Optimizing attachment efficiency and specificity is essential for reliable assay performance.
Purpose of the Study:
- To quantify the coupling efficiencies of oligonucleotides to solid supports with different functionalities.
- To compare the performance of alkyl-amino and carboxyl-bearing supports for oligonucleotide immobilization.
- To assess the impact of different coupling chemistries on the specificity of oligonucleotide attachment.
Main Methods:
- Synthesized and derivatized solid supports (CPG and Sephacryl) with alkyl-amino and carboxyl functionalities.
- Performed covalent attachment of oligonucleotides (17-29 bases) using carbodiimide-mediated coupling and N-hydroxysuccinimide activation.
- Quantified attachment efficiencies and determined the percentage of terminally linked oligonucleotides using analytical methods.
Main Results:
- Alkyl-amino CPG supports achieved 60-80% attachment efficiency.
- Carboxyl-bearing supports showed similar immobilization efficiencies with reduced non-covalent binding.
- Carbodiimide coupling to Sephacryl carboxyl supports resulted in 50-55% terminal attachment.
- N-hydroxysuccinimide-activated Sephacryl carboxyl supports yielded lower overall attachment but >80% end-attachment specificity.
Conclusions:
- Both alkyl-amino and carboxyl functionalities are effective for oligonucleotide immobilization.
- Carboxyl supports offer advantages in reducing non-covalent binding and enhancing end-attachment specificity, particularly when activated with N-hydroxysuccinimide.
- The choice of solid support and coupling chemistry significantly impacts oligonucleotide attachment efficiency and specificity.