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Determining the Thermodynamic and Kinetic Association of a DNA Aptamer and Tetracycline Using Isothermal Titration Calorimetry
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ssDNA aptamers that selectively bind oxytetracycline.

Javed H Niazi1, Su Jin Lee, Yeon Seok Kim

  • 1College of Life Sciences and Biotechnology, Korea University, Anam-dong, Seongbuk-Gu, Seoul 136-701, South Korea.

Bioorganic & Medicinal Chemistry
|November 9, 2007
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Summary

Researchers developed DNA aptamers that specifically bind to oxytetracycline (OTC) with high affinity. These aptamers show promise for detecting OTC and distinguishing it from similar antibiotics.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Oxytetracycline (OTC) is a broad-spectrum antibiotic.
  • Developing selective detection methods for OTC is crucial for various applications.
  • Aptamers offer a promising alternative to traditional antibodies for molecular recognition.

Purpose of the Study:

  • To identify and characterize single-stranded DNA aptamers with high affinity and specificity for oxytetracycline (OTC).
  • To evaluate the selectivity of these aptamers against related tetracycline compounds.
  • To assess the potential of these aptamers for OTC detection and quantification.

Main Methods:

  • Systematic Evolution of Ligands by Exponential Enrichment (SELEX) was employed to select aptamers from a large oligonucleotide library.
  • Binding affinities (K(d)) of selected aptamers were determined using biophysical methods.
  • Selectivity assays were performed by testing aptamer binding against OTC analogs like tetracycline and doxycycline.

Main Results:

  • Four DNA aptamers demonstrated high-affinity binding to OTC, with dissociation constants (K(d)) in the nanomolar range.
  • Aptamers No. 4, 5, and 20 exhibited strong binding affinities (K(d) = 9.61, 12.08, and 56.84 nM, respectively) and high selectivity (72-76%) for OTC.
  • Aptamer No. 4 showed the highest affinity and selectivity, while Aptamer No. 2 displayed weaker affinity and moderate selectivity.
  • Structural features of OTC, such as the absence of a hydroxyl group at the 5-position in tetracycline, were identified as key determinants for aptamer specificity.

Conclusions:

  • The identified DNA aptamers, particularly No. 4, 5, and 20, are highly specific and selective for oxytetracycline.
  • These aptamers demonstrate significant molecular discrimination against tetracycline and doxycycline.
  • The developed aptamers represent promising candidates for the selective detection and potential therapeutic monitoring of OTC.