Synthesis And Structural Investigations Of Alpha Peptides Alpha Peptides Containing Beta Aminocyclopropane Beta Aminocyclopropane Dicarboxylic Acids

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Download or read book Development of [alpha]-helix-like [alpha]/[beta]/[upsilon] Foldamers written by and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Helical peptidomimetics that contain non-natural amino acid residues, such as beta- and gamma-amino acid residues, are less prone to proteolytic degradation than are conventional peptides (composed exclusively of alpha-amino acid residues). However, the additional backbone atoms in beta- and gamma-residues relative to alpha-residues may increase backbone flexibility, and thereby increase the entropic penalty upon binding to a protein partner, resulting in decreased affinity for the targets. Ring-constrained beta- and gamma-amino acids have been developed to address this problem by pre-organizing the residues for helical conformations. This thesis details development of alpha-helix-like alpha/beta/gamma foldamers containing cyclic and/or acyclic beta- and gamma-amino acid residues. Chapters 2 and 3 discuss biophysical investigations of helical alpha/beta/gamma-peptides. Studies of the ring-constrained beta- and gamma-residues' effects on the helicity of alpha/beta/gamma-peptides suggest that beta(3)- and gamma(4)- amino acid residues differ in their intrinsic tendencies to adopt helical secondary structure, with gamma(4)-residues displaying a higher propensity than beta(3)- residues. Different acyclic gamma-residues, and different patterns of alpha, beta and gamma residues in the backbone have been explored. The results show that as long as cyclically constrained beta-amino acids are incorporated into alpha/beta/gamma-peptides, the alpha/beta/gamma-peptide helical propensity is not very sensitive to the nature of the acyclic gamma-amino acids used (although gamma(4)-amino acids are the best helix-adopting acyclic residues) or the pattern of residues within the backbone. Chapter 4 discusses efforts to establish an alpha + alpha/beta/gamma coiled-coil system for use in thermodynamic analysis of alpha + alpha/beta/gamma coiled-coil folding propensities. Chapter 5 discusses efforts toward developing functional alpha/beta/gamma-peptides to modulate apoptosis-regulating protein-protein interactions.