Selection of RNA-binding peptides in vivo

Nature
K HaradaA D Frankel

Abstract

Many priniciples of sequence-specific DNA recognition have been established over the past decade, largely from structural studies of protein-DNA and drug-DNA complexes. On the basis of these principles, it has been possible to design or select variants of known structural motifs, including zinc-fingers and minor groove-binding drugs, that bind desired sequences. Here we describe a strategy, based on transcriptional termination in bacteria, to identify specific RNA-binding peptides using the arginine-rich RNA-binding motif as a framework. Peptides were isolated from two combinatorial libraries that bind tightly and specifically to the Rev response element of HIV. It appears that alpha-helical peptides resembling Rev were selected from one library whereas new peptides that probably do not form helices were selected from the other, suggesting that the arginine-rich motif may be a particularly versatile framework for recognizing RNA structures.

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