Tetrapeptide p-nitroanilides containing (E)-dehydrophenylalanine were synthesized and evaluated as inhibitors and substrates of cathepsin C. Peptides containing a free, unblocked amino group appeared to be quite good substrates of the enzyme, whereas fully protected peptides acted as very weak inhibitors. Structural studies by means of NMR and CD, alongside with molecular modelling, have proved that these peptides are hydrolysed in one step by direct removal of p-nitroaniline from the tetrapeptide.
合成了含有 (E)-dehydrophenylalanine 的四肽对硝基苯胺,并将其作为 cathepsin C 的抑制剂和底物进行了评估。通过核磁共振和 CD 以及分子建模进行的结构研究证明,这些肽可通过直接去除四肽中的对硝基苯胺一步水解。
Enhanced β-turn conformational stability of tripeptides containing ΔPhe in cis over trans configuration
Conformations of three pairs of dehydropeptides with the opposite configuration of the ΔPheresidue, Boc-Gly-ΔZ/EPhe-Phe-p-NA (Z- p -NA and E- p -NA), Boc-Gly-ΔZ/EPhe-Phe-OMe (Z-OMe and E-OMe), and Boc-Gly-ΔZ/EPhe-Phe-OH (Z-OH and E-OH) were compared on the basis of CD and NMRstudies in MeOH, TFE, and DMSO. The CD results were used as the additional input data for the NMR-based calculations of the
3双dehydropeptides与ΔPhe残基的相对构型,将Boc-甘氨酸- Δ的构象Z / E的Phe-Phe- p -NA(Z- p -NA和E- p -NA),将Boc-甘氨酸- Δ ž在CD和NMR研究的基础上比较了/ E Phe-Phe-OMe(Z-OMe和E-OMe)和Boc-Gly- ΔZ / E Phe-Phe-OH(Z-OH和E-OH)在MeOH,TFE和DMSO中。CD结果用作肽的详细溶液构象的基于NMR的计算的其他输入数据。发现Z- p -NA,E- p -NA,Z-OMe和Z-OH采用β-转角构象,并且E-OMe和E-OH是无序的。有两个重叠型III在β转角Z- p -NA,II”型β转角在E- p -NA,和II型β转角在Z-OME和Z-OH。所得结果表明,在具有游离羧基的甲酯和肽的情况下,ΔZ Phe比ΔE是强得多的有序构象的诱导剂。he 还发现酰胺质子的温度
Makowski, Maciej; Rzeszotarska, Barbara; Zbigniew, Kubica, Liebigs Annalen der Chemie, 1985, # 5, p. 893 - 900
作者:Makowski, Maciej、Rzeszotarska, Barbara、Zbigniew, Kubica、Pietrzynski, Grzegorz
DOI:——
日期:——
Synthesis of Tetrapeptides Containing Dehydroalanine, Dehydrophenylalanine and Oxazole as Building Blocks for Construction of Foldamers and Bioinspired Catalysts
structure and additionally enables the introduction of non-typical side-chain substituents. Thus, such compounds could be buildingblocks for obtaining novel foldamers and/or artificial enzymes (artzymes). In this paper, effective synthetic procedures leading to such buildingblocks—tetrapeptides containing glycyldehydroalanine, glycyldehydrophenylalanine, and glycyloxazole subunits—are described. Peptides