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Rigid Double-Stranded DNA Linkers for Single Molecule Enzyme-Drug Interaction Measurements Using Molecular

Thiranjeewa I Lansakara1, Holly S Morris1, Priyanka Singh1

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Single-molecule force measurements reveal enzyme-drug interactions. This atomic force microscopy (AFM) method accurately quantifies binding forces, offering insights beyond average responses.

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Area of Science:

  • Biophysics
  • Biochemistry
  • Pharmacology

Background:

  • Single-molecule studies offer insights into molecular interactions and outlier behaviors often missed in ensemble measurements.
  • Atomic force microscopy (AFM) provides high spatial and force resolution for studying biological interactions under physiological conditions.

Purpose of the Study:

  • To quantify force-distance relationships in enzyme-drug interactions using AFM.
  • To compare different immobilization techniques for proteins and drugs to optimize measurement accuracy and precision.

Main Methods:

  • Utilized atomic force microscopy (AFM) to measure force-distance relations of enzyme-drug interactions.
  • Compared protein immobilization on surfaces: direct monolayer binding versus rigid double-stranded (ds) DNA spacers.
  • Investigated drug immobilization on the AFM tip: direct binding versus flexible poly(ethylene glycol) (PEG) or rigid dsDNA linkers.

Main Results:

  • Enzyme activity remained largely unaffected by immobilization methods compared to solution conditions.
  • The combination of rigid dsDNA linkers on the surface and either flexible or rigid linkers on the tip yielded accurate, reproducible, and specific force measurements.
  • Demonstrated the potential for single-molecule level analysis of drug-enzyme interactions.

Conclusions:

  • Developed a robust AFM-based method for studying enzyme-drug interactions at the single-molecule level.
  • The optimized immobilization strategy ensures high specificity and accuracy in force measurements.
  • This approach facilitates detailed examination of diverse biological targets and drug candidates.