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Molecules 2011, 16(8), 6916-6926; doi:10.3390/molecules16086916
Article

Selective Covalent Conjugation of Phosphorothioate DNA Oligonucleotides with Streptavidin

 and *
TU Dortmund, Fakult├Ąt Chemie, Biologisch-Chemische Mikrostrukturtechnik, Otto-Hahn Strasse 6, 44227 Dortmund, Germany
* Author to whom correspondence should be addressed.
Received: 26 June 2011 / Revised: 8 August 2011 / Accepted: 11 August 2011 / Published: 15 August 2011
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Abstract

Protein-DNA conjugates have found numerous applications in the field of diagnostics and nanobiotechnology, however, their intrinsic susceptibility to DNA degradation by nucleases represents a major obstacle for many applications. We here report the selective covalent conjugation of the protein streptavidin (STV) with phosphorothioate oligonucleotides (psDNA) containing a terminal alkylthiolgroup as the chemically addressable linking unit, using a heterobifunctional NHS-/maleimide crosslinker. The psDNA-STV conjugates were synthesized in about 10% isolated yields. We demonstrate that the terminal alkylthiol group selectively reacts with the maleimide while the backbone sulfur atoms are not engaged in chemical conjugation. The novel psDNA-STV conjugates retain their binding capabilities for both biotinylated macromolecules and the complementary nucleic acid. Moreover, the psDNA-STV conjugate retained its binding capacity for complementary oligomers even after a nuclease digestion step, which effectively degrades deoxyribonucleotide oligomers and thus the binding capability of regular DNA-STV conjugates. The psDNA-STV therefore hold particular promise for applications e.g. in proteome research and novel biosensing devices, where interfering endogenous nucleic acids need to be removed from analytes by nuclease digestion.
Keywords: nanobiotechnology; Protein-DNA conjugate; phosphorothioate; nuclease-stable nanobiotechnology; Protein-DNA conjugate; phosphorothioate; nuclease-stable
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Rabe, K.S.; Niemeyer, C.M. Selective Covalent Conjugation of Phosphorothioate DNA Oligonucleotides with Streptavidin. Molecules 2011, 16, 6916-6926.

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