Journal
ACS CHEMICAL BIOLOGY
Volume 12, Issue 3, Pages 795-804Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acschembio.6b01006
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Funding
- National Institutes of Health [R01CA166264]
- CCSG [NCI 5P30CA160.59-35]
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Highly constrained peptides such as the knotted peptide natural products are promising medicinal agents because of their impressive biostability and potent activity. Yet, libraries of highly constrained peptides are challenging to prepare. Here, we present a method which utilizes two robust, orthogonal chemical steps to create highly constrained bicyclic peptide libraries. This technology was optimized to be compatible with in vitro selections by mRNA display. We performed side-by-side monocyclic and bicyclic selections against a model protein (streptavidin). Both selections resulted in peptides with mid-nanomolar affinity, and the bicyclic selection yielded a peptide with remarkable protease resistance.
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