NMR-Solution Structures of Fluoro-Substitutedβ-Peptides: A314-Helix and a Hairpin Turn. The First Case of a 90° OCCF Dihedral Angle in anα-Fluoro-Amide Group
作者:Raveendra I. Mathad、Bernhard Jaun、Oliver Flögel、James Gardiner、Markus Löweneck、Jeroen D. C. Codée、Peter H. Seeberger、Dieter Seebach、Michael K. Edmonds、Florian H. M. Graichen、Andrew D. Abell
DOI:10.1002/hlca.200790235
日期:2007.12
314-helical structure by enforcing the FCCO ap-conformation, we could now demonstrate that the same procedure leads to a structure with the unfavorable ca. 90° FCCO dihedralangle, enforced by the 314-helical folding in a β-tridecapeptide (cf.1; Fig. 4). This is interpreted as a consequence of cooperative folding in the longer β-peptide. A F-substituent placed in the turn section of a β-peptidic hairpin turn
Syntheses and CD-Spectroscopic Investigations of Longer-Chain -Peptides: Preparation by Solid-Phase Couplings of Single Amino Acids, Dipeptides, and Tripeptides
作者:Per I. Arvidsson、Jens Frackenpohl、Dieter Seebach
DOI:10.1002/hlca.200390133
日期:2003.5
for the efficient syntheses of longer-chain β-peptides (>9 residues) were investigated. They were synthesized on solid phase with Fmoc-protected amino acids or Fmoc-protected di- or tripeptide fragments (assembled using solution-phase synthesis). The use of preformed fragments significantly increased the purity of the crude peptides and facilitated purification. Especially, the use of Fmoc-protected
To gain mechanisticinsights, natural systems with biochemical relevance are inspiring for the creation of new biomimetics with unique properties and functions. Despite progress in rational design and protein engineering, folding and intramolecular organization of individual components into supramolecularstructures remains challenging and requires controlled methods. Foldamers, such as β‐peptides