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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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Combining QD-FRET and Microfluidics to Monitor DNA Nanocomplex Self-Assembly in Real-Time
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A reactive peptidic linker for self-assembling hybrid quantum dot-DNA bioconjugates.

Igor L Medintz1, Lorenzo Berti, Thomas Pons

  • 1U.S. Naval Research Laboratory, Center for Bio/Molecular Science and Engineering Code 6900, Division of Optical Sciences Code 5611, Washington, DC 20375, USA. berti.lorenzo@unimo.it

Nano Letters
|May 29, 2007
PubMed
Summary

Researchers developed a novel peptide linker for self-assembling DNA onto quantum dots (QDs). This method offers a versatile, non-covalent bioconjugation strategy for creating advanced nanoparticle-biomolecule structures.

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Published on: June 26, 2020

Area of Science:

  • Bioconjugation Chemistry
  • Nanomaterials Science
  • Molecular Biology

Background:

  • Semiconductor quantum dots (QDs) offer unique optical properties for bio-applications.
  • Traditional covalent bioconjugation methods often face challenges with purification and efficiency.
  • Self-assembly offers a promising alternative for biomolecule-QD conjugation.

Purpose of the Study:

  • To synthesize and characterize a novel hexahistidine peptide linker for DNA-QD self-assembly.
  • To demonstrate the efficiency and control of this self-assembly process.
  • To showcase the utility of this method by creating a QD-DNA-dye molecular beacon.

Main Methods:

  • Synthesis of a thiol-reactive hexahistidine peptide linker.
  • Chemical attachment of the peptide linker to thiolated DNA oligomers.
  • Self-assembly of DNA-QD conjugates using the peptide linker.
  • Characterization via gel electrophoresis and fluorescence resonance energy transfer (FRET).

Main Results:

  • Successful synthesis and characterization of the hexahistidine peptide linker.
  • Demonstrated high-affinity self-assembly of DNA to CdSe-ZnS core-shell QDs.
  • Achieved control over the average molar ratio of DNA per QD.
  • Fabricated a functional QD-DNA-dye molecular beacon with specific DNA detection capabilities.

Conclusions:

  • The hexahistidine peptide linker provides an effective non-covalent strategy for DNA-QD bioconjugation.
  • This method offers versatility for creating diverse nanoparticle-biomolecule assemblies.
  • The approach has potential for developing advanced biosensors and diagnostic tools.