Specificity of phage display selected peptides for modified anticodon stem and loop domains of tRNA - PubMed

Specificity of phage display selected peptides for modified anticodon stem and loop domains of tRNA

Matthewos Eshete et al. Protein J. 2007 Jan.

Abstract

Protein recognition of RNA has been studied using Peptide Phage Display Libraries, but in the absence of RNA modifications. Peptides from two libraries, selected for binding the modified anticodon stem and loop (ASL) of human tRNA(LyS3) having 2-thiouridine (s(2)U34) and pseudouridine (psi39), bound the modified human ASL(Lys3)(s(2)U34;psi39) preferentially and had significant homology with RNA binding proteins. Selected peptides were narrowed to a manageable number using a less sensitive, but inexpensive assay before conducting intensive characterization. The affinity and specificity of the best binding peptide (with an N-terminal fluorescein) were characterized by fluorescence spectrophotometry. The peptide exhibited the highest binding affinity for ASL(LYS3)(s(2)U34; psi39), followed by the hypermodified ASL(Lys3) (mcm(5)s(2) U34; ms(2)t(6)A37) and the unmodified ASL(Lys3), but bound poorly to singly modified ASL(Lys3) constructs (psi39, ms(2)t(6)A37, s(2)34), ASL(Lys1,2) (t(6)A37) and Escherichia coli ASL(Glu) (s(2)U34). Thus, RNA modifications are potentially important recognition elements for proteins and can be targets for selective recognition by peptides.

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