C<sub>3</sub> and 2D C<sub>3</sub> Marfey’s Methods for Amino Acid Analysis in Natural Products
作者:Soumini Vijayasarathy、Pritesh Prasad、Leith J. Fremlin、Ranjala Ratnayake、Angela A. Salim、Zeinab Khalil、Robert J. Capon
DOI:10.1021/acs.jnatprod.5b01125
日期:2016.2.26
Marfey’s method, including an ability to resolve all Ile isomers, against an array of amino acids commonly encountered in natural products and by comparison to an existing Marfey’s method. We also describe an innovative 2D C3 Marfey’s method as an analytical approach for determining the regiochemistry of enantiomeric amino acid residues in natural products. The C3 and 2D C3 Marfey’s methods represent
我们验证了C 3 Marfey方法的改进的分辨率和灵敏度,包括针对天然产物中常见的一系列氨基酸并通过与现有Marfey方法进行比较而解决所有Ile异构体的能力。我们还描述了一种创新的二维C 3 Marfey方法,作为一种确定天然产物中对映体氨基酸残基的区域化学的分析方法。C 3和2 D C 3 Marfey的方法代表了宝贵的工具,可用于探测和定义天然产物中可水解获得的氨基酸残基的立体复杂性。
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.
Identification of the Biosynthetic Gene Cluster for the Anti-infective Desotamides and Production of a New Analogue in a Heterologous Host
作者:Qinglian Li、Yongxiang Song、Xiangjing Qin、Xing Zhang、Aijun Sun、Jianhua Ju
DOI:10.1021/acs.jnatprod.5b00009
日期:2015.4.24
39-kb dsa biosyntheticgenecluster by whole-genome scanning. Composed of 17 open reading frames, the cluster codes for four nonribosomal peptide synthetases and associated resistance, transport, regulatory, and precursor biosynthesis proteins. Heterologous expression of the dsa genecluster in S. coelicolor M1152 afforded desotamides A and B and the new desotamide G. Clusteridentification and its demonstrated