This application builds on a foundation of recent results from our laboratory detailing a general strategy for the design of beta-peptides that are highly 14-helical in water and bind with high affinity to protein surfaces, such as the p53AD interaction domain of hDM2.
In Aim 1 we explore the structural features that contribute to 14-helix stability in water and the ability of the 14-helical beta-peptide beta53-1 to recognize protein surfaces. We will complete an extensive """"""""host-guest"""""""" analysis that will classify all proteinogenic and selected non-proteinogenic side chains as 14-helix stabilizing, destabilizing, or neutral, generating a database of position-dependent, 14-helix propensities in water; determine the NMR solution structure of beta53-1 to support the host-guest data and guide future design efforts; and explore whether the stability or affinity of beta53-1 can be improved by introduction of cyclic ACHC residues.
In Aim 2 we build on the results of Aim 1 to design beta-peptide ligands for the envelope glycoproteins of 3 viruses that threaten human health, national security, or both: HIV, human respiratory syncytial virus (HRSV), and the coronavirus that causes severe acute respiratory syndrome (SARS-CoV). The experiments in Aim 2 will validate our betapeptide design strategy in a system that is highly relevant and tractable, and will likely provide leads for future drug development.
In Aim 3 we develop methods to synthesize, analyze, and screen beta-peptide combinatorial libraries, and use them to optimize the affinities (and minimize the size) of beta-peptides identified in Aims 1 and 2.
This aim also includes an experiment to identify cell-permeable beta53-1 library members, information that will guide design of beta-peptide ligands for additional validated targets. Taken together, the experiments in this application will provide fundamental information on ligand design and help achieve 1 of the most central and critical (yet unmet) goals of chemical biology research, the rapid identification of high affinity ligands for the vast array of potential non-enzymatic protein targets.
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| Miller, Jonathan P; Melicher, Michael S; Schepartz, Alanna (2014) Positive allostery in metal ion binding by a cooperatively folded ?-peptide bundle. J Am Chem Soc 136:14726-9 |
| Qian, Ziqing; LaRochelle, Jonathan R; Jiang, Bisheng et al. (2014) Early endosomal escape of a cyclic cell-penetrating peptide allows effective cytosolic cargo delivery. Biochemistry 53:4034-46 |
| Hobert, Elissa M; Doerner, Amy E; Walker, Allison S et al. (2013) Effective molarity redux: Proximity as a guiding force in chemistry and biology. Isr J Chem 53:567-576 |
| Holub, Justin M; Larochelle, Jonathan R; Appelbaum, Jacob S et al. (2013) Improved assays for determining the cytosolic access of peptides, proteins, and their mimetics. Biochemistry 52:9036-46 |
| Denton, Elizabeth V; Craig, Cody J; Pongratz, Rebecca L et al. (2013) A ?-peptide agonist of the GLP-1 receptor, a class B GPCR. Org Lett 15:5318-21 |
| Appelbaum, Jacob S; LaRochelle, Jonathan R; Smith, Betsy A et al. (2012) Arginine topology controls escape of minimally cationic proteins from early endosomes to the cytoplasm. Chem Biol 19:819-30 |
| Wang, Pam Shou-Ping; Craig, Cody J; Schepartz, Alanna (2012) Relationship between side-chain branching and stoichiometry in ýý(3)-peptide bundles. Tetrahedron 68:4342-4345 |
| Bautista, Arjel D; Appelbaum, Jacob S; Craig, Cody J et al. (2010) Bridged beta(3)-peptide inhibitors of p53-hDM2 complexation: correlation between affinity and cell permeability. J Am Chem Soc 132:2904-6 |
| Molski, Matthew A; Goodman, Jessica L; Craig, Cody J et al. (2010) Beta-peptide bundles with fluorous cores. J Am Chem Soc 132:3658-9 |
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