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Updated: Aug 23, 2026

Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry
Published on: January 17, 2025
Covalent coupling of DNA oligonucleotides and streptavidin
Florian Kukolka1, Marina Lovrinovic, Ron Wacker
1Biologisch-Chemische Mikrostrukturtechnik, Fachbereich Chemie der Universität Dortmund, Germany.
Abstract:
Semisynthetic DNA-protein conjugates are synthesized by covalent coupling of thiol-modified DNA oligonucleotides and streptavidin. The resulting conjugates have a binding capacity for four equivalents of biotin and one nucleic acid of complementary sequence. The conjugates are purified to homogeneity by ultrafiltration and chromatography and characterized by photometry and gel electrophoresis. Subsequently, the conjugates are applied as molecular linkers in the DNA-directed immobilization of a biotinylated enzyme on a microplate, containing complementary capture oligonucleotides.
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