Calothrixamides A and B from the Cultured Cyanobacterium<i>Calothrix</i>sp. UIC 10520
作者:Camila M. Crnkovic、Aleksej Krunic、Daniel S. May、Tyler A. Wilson、Diana Kao、Joanna E. Burdette、James R. Fuchs、Nicholas H. Oberlies、Jimmy Orjala
DOI:10.1021/acs.jnatprod.8b00432
日期:2018.9.28
strain for chemical investigation based on the presence of new metabolites very early in our discovery process, saving both time and resources. Subsequently, calothrixamides A (1) and B (2) were isolated from large-scale cultures, and the structures were elucidated by 1D and 2D NMR spectroscopy and mass spectrometry. The absolute configurations were determined by a combination of chemical degradation
蓝藻是具有潜在医学和生物技术应用的化学多样性代谢物的来源。快速鉴定化合物对于加快天然产物发现过程至关重要。质谱已被证明是复杂天然产物样品去重复的重要工具。此外,色谱分离和补充光谱分析(例如,UV)可以增强去重复过程的可信度。在这里,我们应用液滴-液体微连接-表面采样探针(液滴探针)与 UPLC-PDA-HRMS-MS/MS 相结合,从淡水菌株 Calothrix sp 中原位鉴定了两种新的天然产物。UIC 10520。这使我们能够在发现过程的早期根据新代谢物的存在来优先对该菌株进行化学研究,从而节省时间和资源。随后,从大规模培养物中分离出calothrixamides A (1) 和B (2),并通过一维和二维核磁共振波谱和质谱阐明了其结构。绝对构型通过化学降解反应、衍生化方法(Mosher's、Marfey's 和苯基甘氨酸甲酯)和基于 J 的构型分析相结合来确定。Calothrixamides