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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Mapping the Binding Site of an Aptamer on ATP Using MicroScale Thermophoresis
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Light-up split aptamers: binding thermodynamics and kinetics for sensing.

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Split aptamers retain tetracycline antibiotic binding function, with longer stem lengths showing similar affinity to full-length aptamers. Shorter stems increased dissociation constants, impacting biosensor performance.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biosensor Technology

Background:

  • Aptamers are DNA or RNA molecules with high specificity for target binding.
  • Split aptamers, while used in biosensors, lack fundamental binding studies.
  • Understanding split aptamer binding is crucial for biosensor development.

Purpose of the Study:

  • To investigate the binding characteristics of split aptamers compared to full-length aptamers.
  • To evaluate the impact of stem length on split aptamer binding affinity and stability.
  • To develop a novel colorimetric biosensor utilizing split aptamers.

Main Methods:

  • Design and synthesis of split aptamers with varying stem lengths.
  • Fluorescence enhancement assays to measure binding affinity (Kd).
  • Temperature-dependent fluorescence and Isothermal Titration Calorimetry (ITC) for stability and thermodynamic analysis.
  • Colorimetric assay development using gold nanoparticles and thiolated aptamers.

Main Results:

  • Longer stem split aptamers exhibited dissociation constants (Kd) comparable to the full-length aptamer.
  • Shorter stem split aptamers showed an 85-fold increase in Kd, indicating reduced binding affinity.
  • Split aptamers demonstrated lower thermostability.
  • ITC revealed increased heat release and greater entropy loss upon split aptamer binding.
  • A functional colorimetric biosensor was successfully developed using pre-assembled split aptamer halves.

Conclusions:

  • Split aptamer stem length significantly influences binding affinity and stability.
  • Split aptamers offer a viable platform for biosensor development, with careful design considerations.
  • The developed colorimetric biosensor demonstrates the practical application of split aptamers for tetracycline detection.