Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 48, Issue 3, Pages 392-397Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2010.12.007
Keywords
Aptamers; Hen egg white lysozyme; Fluorescence anisotropy; Isothermal titration calorimetry
Funding
- NASA [NNJ04HF43G]
- NSF [CTS-0004544]
- Welch Foundation [E-1264]
- NIH, NIBIB
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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. (C) 2011 Elsevier B.V. All rights reserved.
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