Tunable DNA Hybridization Enables Spatially and Temporally Controlled Surface-Anchoring of Biomolecular Cargo

Langmuir. 2018 Dec 11;34(49):15021-15027. doi: 10.1021/acs.langmuir.8b01942. Epub 2018 Aug 30.

Abstract

The controlled immobilization of biomolecules onto surfaces is relevant in biosensing and cell biological research. Spatial control is achieved by surface-tethering molecules in micro- or nanoscale patterns. Yet, there is an increasing demand for temporal control over how long biomolecular cargo stays immobilized until released into the medium. Here, we present a DNA hybridization-based approach to reversibly anchor biomolecular cargo onto micropatterned surfaces. Cargo is linked to a DNA oligonucleotide that hybridizes to a sequence-complementary, surface-tethered strand. The cargo is released from the substrate by the addition of an oligonucleotide that disrupts the duplex interaction via toehold-mediated strand displacement. The unbound tether strand can be reloaded. The generic strategy is implemented with small-molecule or protein cargo, varying DNA sequences, and multiple surface patterning routes. The approach may be used as a tool in biological research to switch membrane proteins from a locally fixed to a free state, or in biosensing to shed biomolecular receptors to regenerate the sensor surface.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Biotin / chemistry
  • Cattle
  • DNA, A-Form / chemistry*
  • DNA, A-Form / genetics
  • Glass / chemistry
  • Immobilized Nucleic Acids / chemistry
  • Immobilized Nucleic Acids / genetics
  • Immobilized Proteins / chemistry
  • Nucleic Acid Hybridization
  • Oligodeoxyribonucleotides / chemistry*
  • Oligodeoxyribonucleotides / genetics
  • Serum Albumin, Bovine / chemistry
  • Streptavidin / chemistry*
  • Surface Properties

Substances

  • DNA, A-Form
  • Immobilized Nucleic Acids
  • Immobilized Proteins
  • Oligodeoxyribonucleotides
  • Serum Albumin, Bovine
  • Biotin
  • Streptavidin