Discovery of a potent stapled helix peptide that binds to the 70N domain of replication protein A.
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Embargo End Date
ICR Authors
Authors
Frank, AO
Vangamudi, B
Feldkamp, MD
Souza-Fagundes, EM
Luzwick, JW
Cortez, D
Olejniczak, ET
Waterson, AG
Rossanese, OW
Chazin, WJ
Fesik, SW
Vangamudi, B
Feldkamp, MD
Souza-Fagundes, EM
Luzwick, JW
Cortez, D
Olejniczak, ET
Waterson, AG
Rossanese, OW
Chazin, WJ
Fesik, SW
Document Type
Journal Article
Date
2014-03-27
Date Accepted
Abstract
Stapled helix peptides can serve as useful tools for inhibiting protein-protein interactions but can be difficult to optimize for affinity. Here we describe the discovery and optimization of a stapled helix peptide that binds to the N-terminal domain of the 70 kDa subunit of replication protein A (RPA70N). In addition to applying traditional optimization strategies, we employed a novel approach for efficiently designing peptides containing unnatural amino acids. We discovered hot spots in the target protein using a fragment-based screen, identified the amino acid that binds to the hot spot, and selected an unnatural amino acid to incorporate, based on the structure-activity relationships of small molecules that bind to this site. The resulting stapled helix peptide potently and selectively binds to RPA70N, does not disrupt ssDNA binding, and penetrates cells. This peptide may serve as a probe to explore the therapeutic potential of RPA70N inhibition in cancer.
Citation
Journal of medicinal chemistry, 2014, 57 (6), pp. 2455 - 2461
Source Title
Publisher
AMER CHEMICAL SOC
ISSN
0022-2623
eISSN
1520-4804
Collections
Research Team
Target Evaluation and Molecular Therapeutics