Urumamide, a novel cyclic depsipeptide that contains a β-aminoacid, was isolated from a marine cyanobacterium Okeania sp. Its gross structure was determined by spectroscopic analyses, and the absolute configuration was established based on Marfey’s analyses and chiral HPLC analyses of hydrolysis products. Biologically, urumamide inhibited the growth of human cancer cells. In addition, urumamide inhibited
prenylation is an outstanding modification in alkaloid and peptide biosynthesis, but its enzymaticbasis has remained elusive. We report the isolation of argicyclamides, a new class of cyanobactins with unique mono- and bis-prenylations on guanidine moieties, from Microcystis aeruginosa NIES-88. The genetic basis of argicyclamide biosynthesis was established by the heterologous expression and in vitro characterization
Application of 3D NMR for Structure Determination of Peptide Natural Products
作者:Fan Zhang、Navid Adnani、Emmanuel Vazquez-Rivera、Doug R. Braun、Marco Tonelli、David R. Andes、Tim S. Bugni
DOI:10.1021/acs.joc.5b01486
日期:2015.9.4
in NMR, structuredetermination is often slow and constitutes a bottleneck in natural products discovery. Removal of this bottleneck would greatly improve the throughput for antibiotic discovery as well as other therapeutic areas. Overall, faster structure methods for structuredetermination will serve the natural products community in a broad manner. This report describes the first application of
尽管核磁共振技术取得了进步,但结构测定通常很慢,并且构成了天然产物发现的瓶颈。消除这一瓶颈将大大提高抗生素发现以及其他治疗领域的吞吐量。总体而言,用于结构测定的更快的结构方法将以广泛的方式服务于天然产物界。本报告描述了 3D NMR 首次应用于阐明两种具有新颖结构的微生物产生的肽天然产物。这些方法具有成本效益,并且大大提高了对所提出结构的信心。
Biosynthetic Gene Cluster of Linaridin Peptides Contains Epimerase Gene
Heterologous expression experiments of three linaridinbiosyntheticgeneclusters revealed that the presence of multiple D-amino acids is a common feature of linaridin natural products, and unveiled the involvement of novel peptideepimerases conserved among linaridinclusters. By gene-deletion experiments, we also show that peptide epimerization occurs in the early stage of biosynthesis.