Brown, John M.; Cutting, Ian; James, Alun P., Bulletin de la Societe Chimique de France, 1988, # 2, p. 211 - 217
作者:Brown, John M.、Cutting, Ian、James, Alun P.
DOI:——
日期:——
Thermodynamic Scale of β-Amino Acid Residue Propensities for an α-Helix-like Conformation
作者:Brian F. Fisher、Seong Ho Hong、Samuel H. Gellman
DOI:10.1021/jacs.8b05162
日期:2018.8.1
These measurements depend on formation of a parallel coiled-coil tertiary structure when two peptide segments become linked by thioester formation. One peptide segment contains a "guest" site that accommodates diverse β residues and is distal to the coiled-coil interface. We find that helix propensity is influenced by sidechain placement within the β residue [β3 (sidechain adjacent to nitrogen) slightly
u-(S,S)-β-HAla(αMe)-β-HVal-β-HAla- β-HLeu-OH (22), with a central (2S,3S)-3-amino-2-methylbutanoic-acid residue, confirm the helical structure of such β-peptides (previously discovered in pyridine solution) (Fig.3 and Tables 1–5). The CD spectra of helical β-peptides, the residues of which were prepared by (retentive) Arndt-Eistert homologation of the (S)- or L-α-amino acids, show a trough at 215 nm