Download MendeleyRapid identification of small binding motifs with high-throughput phage display: discovery of peptidic antagonists of IGF-1 function.
Deshayes, K., Schaffer, M.L., Skelton, N.J., Nakamura, G.R., Kadkhodayan, S., Sidhu, S.S.(2002) Chem Biol 9: 495-505
- PubMed: 11983338
- DOI: https://doi.org/10.1016/s1074-5521(02)00129-1
- Primary Citation of Related Structures:
1LB7 - PubMed Abstract:
A panel of 22 naïve peptide libraries was constructed in a polyvalent phage display format and sorted against insulin-like growth factor-1 (IGF-1). The libraries were pooled to achieve a total diversity of 4.4 x 10(11). After three rounds of selection, the majority of the phage clones bound specifically to IGF-1, with a disulfide-constrained CX(9)C scaffold dominating the selection. Four monovalently displayed sub-libraries were designed on the basis of these conserved motifs. Sub-library maturation in a monovalent format yielded an antagonistic peptide that inhibited the interactions between IGF-1 and two cell-surface receptors and those between IGF-1 and two soluble IGF binding proteins with micromolar potency. NMR analysis revealed that the peptide is highly structured in the absence of IGF-1, and peptides that preorganize the binding elements were selected during the sorting.
Organizational Affiliation:
Department of Protein Engineering, Genentech, South San Francisco, CA 94080, USA. deshayes@gene.com
