Total Synthesis and Antibacterial Study of Cyclohexapeptides Desotamide B, Wollamide B and Their Analogs
作者:Yi-Xing Chen、Chao Liu、Nan Liu、Ye Wu、Qing-Jie Zhao、Hong-Gang Hu、Xiang Li、Yan Zou
DOI:10.1002/cbdv.201700414
日期:2018.1
mammalian cells (IC50 > 30 μm). Herein we firstly report the totalsynthesis of above two cyclohexapeptides as well as a series of structural variants through solid phase peptide synthesis, of which 3 displayed a 2‐fold increase of antibacterial activity when compared with the original peptide 1. This strategy may offer good improvements for the synthesis of other cyclic peptides.
作为天然产物来源的抗生素,去硫酰胺 A – D 和 wollamides 对革兰氏阳性菌具有生长抑制活性(IC50 0.6 – 7 μm),对哺乳动物细胞无细胞毒性(IC50 > 30 μm)。在此,我们首先报告了上述两种环六肽以及一系列结构变体通过固相肽合成的全合成,其中 3 种与原始肽 1 相比抗菌活性提高了 2 倍。改进其他环肽的合成。
Solid-phase synthesis of cyclic hexapeptides wollamides A, B and desotamide B
作者:Lissa S. Tsutsumi、Ghee T. Tan、Dianqing Sun
DOI:10.1016/j.tetlet.2017.05.084
日期:2017.7
Solid-phasesynthesis of antibacterial cyclohexapeptides including wollamides A, B and desotamide B has been developed. Briefly, the protected linear hexapeptides were assembled on 2-chlorotrityl chloride resin using standard Fmoc chemistry and diisopropylcarbodiimide/hydroxybenzotriazole coupling reagents, cleaved off-resin with hexafluoroisopropanol/dichloromethane to keep side-chain protecting groups
Macrocyclization improves the pharmaceutical properties of peptides; however, regio- and chemoselective intramolecular cyclizations remain challenging. Here we developed a streamlined chemoenzymatic approach to synthesize cyclic peptides by exploiting non-ribosomal peptide (NRP) cyclases. Linear peptides linked to the resin through a C-terminal diol ester functionality are synthesized on a solid support
Wollamides: Antimycobacterial Cyclic Hexapeptides from an Australian Soil <i>Streptomyces</i>
作者:Zeinab G. Khalil、Angela A. Salim、Ernest Lacey、Antje Blumenthal、Robert J. Capon
DOI:10.1021/ol502472c
日期:2014.10.3
A soil Streptomyces nov. sp. (MST-115088) isolated from semiarid terrain near Wollogorang Station, Queensland returned two known and two new examples of a rare class of cyclic hexapeptide, desotamides A and B (1 and 2) and E and F (3 and 4), respectively, together with two new D-Orn homologues, wollamides A and B (5 and 6) . Structures were assigned by detailed spectorscopic and C-3 Marfey's anlaysis. the desotamides/wollamides exhibit growth inhibitory activity aganist Gram-positive bacteria (IC50 0.6-7 mu M) and are noncytotoxic to mammalian cells (IC50 > mu M). The wollamides exhibit antimycobacterial activity (IC50 2.8 and 3.1 mu M), including reduction in the intracellular mycobacterial survival in murine bone marrow-derived macrophages.
Solid-Phase Synthesis and Antibacterial Activity of Cyclohexapeptide Wollamide B Analogs
作者:Lissa S. Tsutsumi、John M. Elmore、Uyen T. Dang、Miranda J. Wallace、Ravikanthreddy Marreddy、Robin B. Lee、Ghee T. Tan、Julian G. Hurdle、Richard E. Lee、Dianqing Sun
DOI:10.1021/acscombsci.7b00189
日期:2018.3.12
scaffold were key for antituberculosis and/or antibacterialactivity. In addition, against M. tuberculosis and Gram-positive bacteria, residues in position II and/or VI greatly impacted antibacterialactivity and selectivity. Wollamides A (3) and B (2) along with their corresponding II (l-Leu) analog 10 retained the most promising antituberculosis activity, with the lowest minimum inhibitory concentration