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。
Hantupeptins B and C, cytotoxic cyclodepsipeptides from the marine cyanobacterium Lyngbya majuscula
作者:Ashootosh Tripathi、Jonathan Puddick、Michele R. Prinsep、Peter Peng Foo Lee、Lik Tong Tan
DOI:10.1016/j.phytochem.2009.10.006
日期:2010.2
Hantupeptins B (2) and C (3) were isolated, along with the previously reported hantupeptin A (1), from the marine cyanobacterium, Lyngbyamajuscula, collected from Pulau Hantu Besar, Singapore. Their structures were elucidated by interpretation of extensive 1D and 2D NMR spectroscopic data. Compounds 2 and 3 are cyclicdepsipeptides consisting of five alpha-amino/hydroxy acid residues, including phenyllactic
Hantupeptins B (2) 和 C (3) 以及先前报道的 Hantupeptin A (1) 是从从新加坡 Pulau Hantu Besar 收集的海洋蓝藻 Lyngbya majuscula 中分离出来的。它们的结构通过对大量 1D 和 2D NMR 光谱数据的解释得到阐明。化合物2和3是由5个α-氨基/羟基酸残基组成的环状缩肽,包括苯基乳酸、脯氨酸、N-甲基-缬氨酸、缬氨酸、N-甲基-异亮氨酸和不同不饱和度的β-羟基酸单元在每个分子的末端。常见氨基酸和苯基乳酸的绝对构型分别由先进的 Marfey 和手性 HPLC 分析确定。Hantupeptin A 中 3-羟基-2-甲基-7-辛酸部分的完整立体化学通过同核 J 分辨 2D NMR 实验和 Mosher 方法的组合阐明。Hantupeptins B 和 C 在针对 MOLT-4(白血病)和 MCF-7(乳腺癌)细胞系进行测试时显示出中等的体外细胞毒性。
Nocardiopsins: New FKBP12-Binding Macrolide Polyketides from an Australian Marine-Derived Actinomycete,<i>Nocardiopsis</i>sp.
作者:Ritesh Raju、Andrew M. Piggott、Melissa Conte、Zakir Tnimov、Kirill Alexandrov、Robert J. Capon
DOI:10.1002/chem.200902933
日期:2010.3.8
A marine‐derived actinomycete, Nocardiopsis sp. (CMB‐M0232), obtained from a sediment sample collected at a depth of 55 m off the coast of Brisbane, Australia, yielded two newmacrolidepolyketides. Structures for nocardiopsins A and B were assigned by detailed spectroscopic analysis, degradation and chemical derivatization. A Marfey’s analysis revealed an unexpected acid‐mediated partial racemization
Anti-inflammatory Amino Acid Derivatives from the Ascidian <i>Herdmania momus</i>
作者:Jian Lin Li、Sang Chul Han、Eun Sook Yoo、Sook Shin、Jongki Hong、Zheng Cui、Huayue Li、Jee H. Jung
DOI:10.1021/np200397g
日期:2011.8.26
Four new amino acid derivatives, herdmanines A–D (1–4), were isolated from the marine ascidianHerdmaniamomus. Herdmanines A–C contain the unusual d-form of arginine. Compounds 3 and 4 had a moderate suppressive effect on the production of NO, with IC50 values of 96 and 9 μM, respectively. These compounds were found to inhibit the mRNA expression of iNOS. The inhibitory activities on the production
The thermophilicbacterium Thermoactinomyces vulgaris strain ISCAR 2354, isolated from a coastal hydrothermal vent in Iceland, was shown to contain thermoactinoamide A (1), a new cyclic hexapeptide composed of mixed d and l amino acids, along with five minor analogues (2–6). The structure of 1 was determined by one- and two-dimensional NMR spectroscopy, high-resolution tandem mass spectrometry, and