催吐的蜡状芽孢杆菌毒素蜡样内酯在食品工业中存在巨大的安全隐患,食用受污染的食品后会引起呕吐和恶心。除了蜡菊酯本身以外,已经阐明了七个结构相关的同工型,即异蜡菊酯A–G的化学结构,并且可以在被蜡样芽孢杆菌污染的食物样品中进一步鉴定。新进行的异胡芦巴苷A的分离首次允许生物合成生产的异胡芦巴苷的1D和2D-NMR光谱,揭示的结果与其化学结构中1 - O- Leu部分的先前假设相矛盾。通过进一步应用水解后二肽分析,氨基酸和通过UPLC-ESI-TOF-MS进行α-羟酸分析以及MS n测序,可以纠正先前报道的异胡芦巴素A的结构。代替迄今假定的l - O -Leu,可以在环状十二肽中验证一个l - O -Ile单元,从而将异鲸蜡内酯A的结构修改为[(d - O -Leu- d -Ala- 1 - O -Val- l -Val)2(d - O -Leu- d -Ala- l - O -Ile- l-Val)]。
Synthesis of Four Lysine-Linked Cereulide Analogues Showing Ionophoric Activity Towards Potassium Cations as Lead Compounds for Emetic Toxin-Detection by Immunoassays
Thioesterase from Cereulide Biosynthesis Is Responsible for Oligomerization and Macrocyclization of a Linear Tetradepsipeptide
作者:Graham W. Heberlig、Christopher N. Boddy
DOI:10.1021/acs.jnatprod.0c00333
日期:2020.6.26
intermediate predicted from canonical activity of CesA and CesB. To differentiatebetween the mechanisms, both tetradepsipeptides were prepared as N-acetyl cysteamine thioesters (SNAC), and the ability of the purified recombinant terminal CesB thioesterase (CesB TE) to oligomerize and macrocyclize each substrate was probed. Only the canonical substrate is converted to cereulide, ruling out the alternative mechanism
Higher Structure of Cereulide, an Emetic Toxin from<i>Bacillus cereus</i>, and Special Comparison with Valinomycin, an Antibiotic from<i>Streptomyces fulvissimus</i>
作者:Arthit Makarasen、Kenji Yoza、Minoru Isobe
DOI:10.1002/asia.200900011
日期:2009.5.4
to be confused: Cereulide is an emetictoxin produced by Bacillus cereus through an unusual non‐ribosomal peptide synthesis, whereas valinomycin, produced by Streptomyces fulvissimus, is a known antibiotic drug. Cereulide has a greater complexation ability with metal ions than valinomycin and also exhibits a K+‐ion‐selective ionophore property at lower concentrations than valinomycin.
Cereulide is a principal toxin causing emetic syndrome produced by Bacillus cereus. This paper deals with biosynthetic studies on this unusual cyclic depsipeptide toxin from C-13 labeled L-amino acid precursors (Val, Leu, Ala) upon cultivation in synthetic media. The analyses were made at atomic level of the constituent amino- or oxy-acids through NMR and ESI-MS/MS spectroscopic methods on cereulide and its hydrolysate dipeptides. The incorporation of the C-13 atom was 95% in each O-Val, O-Leu and L-Val, while 40% in D-Ala of cereulide. (C) 2000 Elsevier Science Ltd. All rights reserved.
Synthesis of Four Lysine-Linked Cereulide Analogues Showing Ionophoric Activity Towards Potassium Cations as Lead Compounds for Emetic Toxin-Detection by Immunoassays
作者:Minoru Isobe、Arthit Makarasen、Toshio Nishikawa
DOI:10.1055/s-0029-1216837
日期:2009.7
An improved total synthesis of the emetic toxin cereulide and the preparation of four lysine-linked cereulide analogues is described. The cereulide analogues are prepared by replacing one of the amino acid residues in cereulide with lysine. The cereulide analogues demonstrate ionophoric activity towards alkali metal ions and inorganic ammonium ions, and are currently being used to develop an enzyme-linked immunosorbent assay for cereulide.
Structure Revision of Isocereulide A, an Isoform of the Food Poisoning Emetic Bacillus cereus Toxin Cereulide
作者:Veronika Walser、Markus Kranzler、Monika Ehling-Schulz、Timo D. Stark、Thomas F. Hofmann
DOI:10.3390/molecules26051360
日期:——
The emetic Bacillus cereustoxincereulide presents an enormous safety hazard in the food industry, inducing emesis and nausea after the consumption of contaminated foods. Additional to cereulide itself, seven structurally related isoforms, namely the isocereulides A–G, have already been elucidated in their chemical structure and could further be identified in B. cereus contaminated foodsamples. The
催吐的蜡状芽孢杆菌毒素蜡样内酯在食品工业中存在巨大的安全隐患,食用受污染的食品后会引起呕吐和恶心。除了蜡菊酯本身以外,已经阐明了七个结构相关的同工型,即异蜡菊酯A–G的化学结构,并且可以在被蜡样芽孢杆菌污染的食物样品中进一步鉴定。新进行的异胡芦巴苷A的分离首次允许生物合成生产的异胡芦巴苷的1D和2D-NMR光谱,揭示的结果与其化学结构中1 - O- Leu部分的先前假设相矛盾。通过进一步应用水解后二肽分析,氨基酸和通过UPLC-ESI-TOF-MS进行α-羟酸分析以及MS n测序,可以纠正先前报道的异胡芦巴素A的结构。代替迄今假定的l - O -Leu,可以在环状十二肽中验证一个l - O -Ile单元,从而将异鲸蜡内酯A的结构修改为[(d - O -Leu- d -Ala- 1 - O -Val- l -Val)2(d - O -Leu- d -Ala- l - O -Ile- l-Val)]。