Perturbation of discrete sites on a single protein domain with RNA aptamers: targeting of different sides of the TATA-binding protein (TBP).
Control of interactions among proteins is critical in the treatment of diseases, but the specificity required is not easily incorporated into small molecules. Macromolecules could be more suitable as antagonists in this situation, and RNA aptamers have become particularly promising. Here we describe a novel selection procedure for RNA aptamers against a protein that constitutes a single structural domain, the Drosophila TATA-binding protein (TBP). In addition to the conventional filter partitioning method with free TBP as target, we performed another experiment, in which the TATA-bound form of TBP was targeted. Aptamers generated by both selections were able to bind specifically to TBP, but the two groups showed characteristics which were clearly different in terms of their capability to compete with TATA-DNA, their effects on the TATA-bound form of TBP, and their effects on in vitro transcription. The method used to generate these two groups of aptamers can be used with other targets to direct aptamer specificity to discrete sites on the surface of a protein.
Department of Molecular and Cellular Biology, Institute for Frontier Medical Sciences, Kyoto University.
Ken I
KI
Hohmura
Hua
H
Shi
Kazunori
K
Hirayoshi
D000818:Animals; D052157:Aptamers, Nucleotide / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D001665:Binding Sites / Q000235:genetics; D004247:DNA / Q000737:chemistry / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000235:genetics; D017434:Protein Structure, Tertiary / Q000235:genetics*; D035181:TATA-Box Binding Protein / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic
D052157:Aptamers, Nucleotide; D004268:DNA-Binding Proteins; D035181:TATA-Box Binding Protein; D004247:DNA