applied to a one‐pot protection‐glycosylation reaction to form the disaccharide derivative 7 d for the synthesis of lipidIIanalogues. The temporary protecting group or linker at the C‐6 position and N‐Troc protecting group of 7 d can be cleaved simultaneously through a reductive condition. Overall yields of syntheses of lipidII (1) and neryl‐lipidII Nε‐dansylthiourea are significantly improved by
(2,6-二氯-4-甲氧基苯基)(2,4-二氯苯基)甲基三氯乙酰亚胺酯( 3 )及其聚合物支撑试剂4可成功应用于一锅保护糖基化反应,形成二糖衍生物7d 用于合成脂质 II 类似物。C-6位的临时保护基或连接基和7d的N -Troc保护基可以通过还原条件同时裂解。通过使用所描述的方法,脂质 II ( 1 ) 和橙花基脂质 II N ε -丹磺基硫脲的合成总产率显着提高。
The First Total Synthesis of Lipid II: The Final Monomeric Intermediate in Bacterial Cell Wall Biosynthesis
作者:Michael S. VanNieuwenhze、Scott C. Mauldin、Mohammad Zia-Ebrahimi、Brian E. Winger、William J. Hornback、Shankar L. Saha、James A. Aikins、Larry C. Blaszczak
DOI:10.1021/ja017386d
日期:2002.4.1
Bacterial peptidoglycan is composed of a network of beta-[1,4]-linked glyan strands that are cross-linked through pendant peptide chains. The final product, the murein sacculus, is a single, covalently closed macromolecule that precisely defines the size and shape of the bacterialcell. The recent increase in bacterial resistance to cellwall active agents has led to a resurgence of activity directed
Insights into the Mechanism of Action of the Two-Peptide Lantibiotic Lacticin 3147
作者:Alireza Bakhtiary、Stephen A. Cochrane、Pascal Mercier、Ryan T. McKay、Mark Miskolzie、Clarissa S. Sit、John C. Vederas
DOI:10.1021/jacs.7b04728
日期:2017.12.13
LtnA2) that displays nanomolar activity against many Gram-positive bacteria. Lacticin 3147 may exert its antimicrobial effect by several mechanisms. Isothermal titration calorimetry experiments show that only LtnA1 binds to the peptidoglycan precursor lipid II, which could inhibit peptidoglycan biosynthesis. An experimentally supported model of the resulting complex suggests that the key binding partners
Lacticin 3147 是一种双肽 lantibiotc(LtnA1 和 LtnA2),对许多革兰氏阳性菌显示出纳摩尔级的活性。Lacticin 3147 可能通过多种机制发挥其抗菌作用。等温滴定量热实验表明,只有 LtnA1 与肽聚糖前体脂质 II 结合,可以抑制肽聚糖的生物合成。所得复合物的实验支持模型表明,关键的结合伙伴是 LtnA1 的 C 端和脂质 II 的焦磷酸盐。体内和体外检测的组合表明 LtnA1 和 LtnA2 可以诱导快速膜裂解,而无需脂质 II 结合。然而,脂质 II 的存在大大增加了乳酸菌素 3147 的活性。此外,
Optimizations of lipid II synthesis: an essential glycolipid precursor in bacterial cell wall synthesis and a validated antibiotic target
作者:Milandip Karak、Cian R Cloonan、Brad R Baker、Rachel V K Cochrane、Stephen A Cochrane
DOI:10.3762/bjoc.20.22
日期:——
glycolipid found in bacteria. Accessing this valuable cell wall precursor is important both for studying cell wall synthesis and for studying/identifying novel antimicrobial compounds. Herein, we describe optimizations to the modular chemical synthesis of lipid II and unnatural analogues. In particular, the glycosylation step, a critical step in the formation of the central disaccharide unit (GlcNAc-MurNAc)
抽象的 脂质 II 是细菌中发现的一种必需糖脂。获取这种有价值的细胞壁前体对于研究细胞壁合成和研究/鉴定新型抗菌化合物都很重要。在此,我们描述了脂质 II 和非天然类似物的模块化化学合成的优化。特别是,优化了糖基化步骤,这是形成中心二糖单元(GlcNAc-MurNAc)的关键步骤。这是通过使用具有不同离去基团的糖基供体来实现的。这种方法的主要优点在于其适应性,允许通过在合成的不同阶段合并替代构建模块来生成多种类似物。 Beilstein J. Org. Chem. 2024, 20, 220–227. doi:10.3762/bjoc.20.22