Retention of function in the DNA homolog of the RNA dopamine aptamer.
While it is generally accepted that the functional tertiary structures formed by RNA cannot be replicated by a deoxy version of the same sequence, here we demonstrate conservation of function for a DNA homolog of an RNA aptamer. Using fluorescence anisotropy experiments, this work demonstrates that the all-DNA version of the RNA dopamine aptamer is able to bind dopamine with improved affinity and similar specificity relative to the RNA aptamer. Mutation studies suggest that the binding site is maintained in both structure types. These findings will help to elucidate what sequences and secondary structures allow for retention of function in both RNA and DNA.
Walsh
Ryan
R
Chemistry Department, Carleton University, 1125 Colonel By Drive, Ottawa, Ont., Canada K1S 5B6.
DeRosa
Maria C
MC
D016880:Anisotropy; D052157:Aptamers, Nucleotide / Q000737:chemistry* / Q000235:genetics; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D004247:DNA / Q000737:chemistry* / Q000235:genetics; D004298:Dopamine / Q000737:chemistry*; D005453:Fluorescence; D008969:Molecular Sequence Data; D009154:Mutation; D009690:Nucleic Acid Conformation; D012313:RNA / Q000737:chemistry* / Q000235:genetics
D052157:Aptamers, Nucleotide; D012313:RNA; D004247:DNA; D004298:Dopamine