Biophysical characterization of DNA and RNA aptamer interactions with hen egg lysozyme

Ajish S.R. Potty, Katerina Kourentzi, Han Fang, Peter Schuck, Richard C. Willson

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


This work characterized the binding of an RNA aptamer recognizing hen egg white lysozyme, as well as a literature-reported single-stranded DNA analog of sequence identical to the original RNA aptamer, using fluorescence anisotropy, isothermal titration calorimetry (ITC) and analytical ultracentrifugation. The polyanionic DNA aptamer analog is selective for lysozyme even over cationic cytochrome c and has been reported to be successfully used in biosensing applications. The association however, is predominantly of electrostatic character, strongly salt-sensitive and entropically-driven, in contrast to previously described enthalpically-driven antibody-lysozyme and DNA aptamer-VEGF interactions. With a moderate selectivity for their target, high salt-sensitivity along with fast association and dissociation behavior, these molecules might serve as pseudo-affinity ligands for biomolecular separations.

Original languageEnglish (US)
Pages (from-to)392-397
Number of pages6
JournalInternational Journal of Biological Macromolecules
Issue number3
StatePublished - Apr 1 2011


  • Aptamers
  • Fluorescence anisotropy
  • Hen egg white lysozyme
  • Isothermal titration calorimetry

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Structural Biology


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