branched aminoacids (Ile, Thr) with slowly hydrolyzing (6 < t < 24 h) propensities, and (iii) non-hydrolyzing ones, such as the hard-to-couple β-amino acids or β-sugar aminoacidderivatives, stable for longer times (t > 24 h) in solution. The current insight into the kinetics of this key hydrolysis side reaction serves as a guide to optimize the coupling conditions of α- and β-amino acids, thereby
Asymmetric Synthesis of a New Helix-Forming β-Amino Acid: trans-4-Aminopiperidine-3-carboxylic Acid
作者:Marina Schinnerl、Justin K. Murray、Joseph M. Langenhan、Samuel H. Gellman
DOI:10.1002/ejoc.200390112
日期:2003.2
We report a synthesis of a protected derivative of trans-4-aminopiperidine-3-carboxylicacid (APiC). The route provides either enantiomer. All intermediates are purified by crystallization, and large-scale preparation is therefore possible. An analogous route provides either enantiomer of trans-2-aminocyclohexanecarboxylic acid (ACHC). We have previously shown that β-peptide oligomers containing ACHC
Iterative Structure-Based Optimization of Short Peptides Targeting the Bacterial Sliding Clamp
作者:Clément Monsarrat、Guillaume Compain、Christophe André、Sylvain Engilberge、Isabelle Martiel、Vincent Oliéric、Philippe Wolff、Karl Brillet、Marie Landolfo、Cyrielle Silva da Veiga、Jérôme Wagner、Gilles Guichard、Dominique Y. Burnouf
DOI:10.1021/acs.jmedchem.1c00918
日期:2021.12.9
The bacterial DNA sliding clamp (SC), or replication processivity factor, is a promising target for the development of novel antibiotics. We report a structure–activity relationship study of a new series of peptides interacting within the Escherichia coli SC (EcSC) binding pocket. Various modifications were explored including N-alkylation of the peptide bonds, extension of the N-terminal moiety, and
细菌 DNA 滑动钳 (SC) 或复制持续性因子是开发新型抗生素的有希望的目标。我们报告了在大肠杆菌SC ( Ec SC) 结合口袋内相互作用的一系列新肽的结构-活性关系研究。探索了各种修饰,包括肽键的 N-烷基化、N-末端部分的延伸以及在 C-末端引入疏水性和受约束的残基。在每个类别中,鉴定出增加对Ec SC 的亲和力的单一修饰。与具有K d的亲本肽相比,这些修饰的组合在几种情况下产生了显着增加的亲和力在 30-80 nM 的范围内。11 种肽/ Ec SC 共晶体的 X 射线结构分析揭示了肽-蛋白质界面处的新相互作用(即堆叠相互作用、氢键和疏水接触),这可以解释改进的结合。还发现最好的粘合剂中的几种化合物在抑制 SC 依赖性 DNA 合成方面更有效。
Antifungal Activity of 14-Helical β-Peptides against Planktonic Cells and Biofilms of Candida Species
Candida albicans is the most prevalent cause of fungal infections and treatment is further complicated by the formation of drug resistant biofilms, often on the surfaces of implanted medical devices. In recent years, the incidence of fungal infections by other pathogenic Candida species such as C. glabrata, C. parapsilosis and C. tropicalis has increased. Amphiphilic, helical β-peptide structural mimetics of natural antimicrobial α-peptides have been shown to exhibit specific planktonic antifungal and anti-biofilm formation activity against C. albicans in vitro. Here, we demonstrate that β-peptides are also active against clinically isolated and drug resistant strains of C. albicans and against other opportunistic Candida spp. Different Candida species were susceptible to β-peptides to varying degrees, with C. tropicalis being the most and C. glabrata being the least susceptible. β-peptide hydrophobicity directly correlated with antifungal activity against all the Candida clinical strains and species tested. While β-peptides were largely ineffective at disrupting existing Candida biofilms, hydrophobic β-peptides were able to prevent the formation of C. albicans, C. glabrata, C. parapsilosis and C. tropicalis biofilms. The broad-spectrum antifungal activity of β-peptides against planktonic cells and in preventing biofilm formation suggests the promise of this class of molecules as therapeutics.
作者:Amy J. Karlsson、William C. Pomerantz、Bernard Weisblum、Samuel H. Gellman、Sean P. Palecek
DOI:10.1021/ja064630y
日期:2006.10.1
We have discovered that short β-peptides (9 or 10 residues) designed to adopt globally amphiphilic helical conformations display significant antifungal activity. The most promising β-peptides cause little lysis of human red blood cells at concentrations that kill Candida albicans, a common human fungal pathogen. Since fungi are eukaryotes, discrimination between fungal and human cells is a significant