PEDS Advance Access published online on November 5, 2004
Protein Engineering Design and Selection, doi:10.1093/protein/gzh084
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1 Department of Chemical Engineering, University of California, Santa Barbara, CA 93106, USA
* To whom correspondence should be addressed. A robust bacterial display methodology has been developed enabling rapid isolation of peptides that bind to arbitrarily selected targets with high affinity. To demonstrate the utility of this approach, a large library (5x1010 clones) was constructed composed of random 15-mer peptide insertions constrained within a flexible, surface exposed loop of the E. coli outer membrane protein A (OmpA). The library was screened for binding to five unrelated proteins, including targets previously used in phage display selections: human serum albumin, anti-T7 epitope mAb, human C-reactive protein, HIV-1 GP120, and streptavidin. Two to four rounds of enrichment (2-4 days) were sufficient to enrich peptide ligands having high affinity for each of the target proteins. Strong amino acid consensus sequences were apparent for each of the targets tested, with up to seven consensus residues. Isolated peptide ligands remained functional when expressed as insertional fusions within a monomeric fluorescent protein. This bacterial display methodology thus provides an efficient process for identifying peptide affinity reagents and should be useful in a variety of molecular recognition applications.
Revised October 2, 2004
Accepted October 23, 2004
Article
Rapid isolation of high affinity protein binding peptides using bacterial display
Patrick S. Daugherty, E-mail: psd{at}engineering.ucsb.edu
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