Defining dynamic protein-protein interactions in the ubiquitin conjugation reaction is a challenging research area. Generating peptide aptamers that target components such as ubiquitin itself, E1, E2, or E3 could provide tools to dissect novel features of the enzymatic cascade. Next-generation deep sequencing platforms were used to identify peptide sequences isolated from phage-peptide libraries screened against Ubiquitin and its ortholog NEDD8. In over three rounds of selection under differing wash criteria, over 13,000 peptides were acquired targeting ubiquitin, while over 10,000 peptides were selected against NEDD8. The overlap in peptides against these two proteins was less than 5% suggesting a high degree in specificity of Ubiquitin or NEDD8 toward linear peptide motifs. Two of these ubiquitin-binding peptides were identified that inhibit both E3 ubiquitin ligases MDM2 and CHIP. NMR analysis highlighted distinct modes of binding of the two different peptide aptamers. These data highlight the utility of using next-generation sequencing of combinatorial phage-peptide libraries to isolate peptide aptamers toward a protein target that can be used as a chemical tool in a complex multi-enzyme reaction.

Faculty of Chemistry University of Gdańsk Gdańsk Poland

Institute of Biochemistry and Biophysics Polish Academy of Sciences Warsaw Poland

International Centre for Cancer Vaccine Science University of Gdańsk Gdańsk Poland

Research Centre for Applied Molecular Oncology Masaryk Memorial Cancer Institute Brno Czechia

University of Edinburgh Institute of Genetics and Molecular Medicine Edinburgh United Kingdom

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The development of a canine single-chain phage antibody library to isolate recombinant antibodies for use in translational cancer research