We report herein the first homogeneous assays based on the ribonuclease act
ivity of a deoxyribozyme. The previously reported deoxyribozyme was covalen
tly modified with biotin and used to assay biotin-binding interactions thro
ugh changes in fluorescence upon substrate turnover. Deoxyribozymes with fl
uorescence-based reporting have the potential to serve as general analytica
l tools.