Structure–Taste Relationships of Aspartyl Tetrapeptide Esters
作者:Yasuo Ariyoshi
DOI:10.1246/bcsj.58.1727
日期:1985.6
A series of fourteen analogues of l-α-Asp–Gly–Gly–Gly–OMe has been synthesized in relation to structural features of sweet peptides. The rule in the structure-taste relationships of tripeptides barely applies to the aspartyl tetrapeptide esters. In order for the aspartyl tetrapeptide esters to be sweet, the second amino acid must have a d-configuration and a small, compact alkyl side chain. However, the sweetness was accompanied by a bitter or astringent taste. Moreover, some of the tetrapeptides were not sweet but bitter, though they satisfied the requirements for sweet peptides. With increasing length of a peptide, it becomes difficult to fit the deep receptor pocket.
作者:Dung Le Nguyen、Jean-Robert Dormoy、Bertrand Castro、Daniel Prevot
DOI:10.1016/0040-4020(81)85016-8
日期:1981.1
extrathermodynamic assumptions is proposed, that allows the prediction of the degree of epimerization in tripeptide model reactions of condensation of peptide segments as a function of the primary structure. The experimental validation of this equation is presented in the field of the 125 tripeptides containing alanine, leucine, phenylalanine, valine and isoleucine, the prediction requires 13 epimerization
The ligation of sterically demanding peptidyl sites such as those involving Val–Val and Val–Pro linkages has proven to be extremely challenging with conventional NCL methods that rely on exogenous thiol additives. Herein, we report an efficient β-thiolactone-mediated additive-free NCL protocol that enables the establishment of these connections in good yield. The rapid NCL was followed by in situ desulfurization