细菌托酚酮天然产物,如托酚酮、托托二硫代酸或玫瑰杀菌剂,在各种陆地和海洋共生相互作用中起着至关重要的作用,如毒力因子、抗生素、除藻剂或群体感应信号。我们现在表明,它们知之甚少的生物合成依赖于需氧 CoA 依赖性苯乙酸分解代谢的分流产物,该分流产物由专用的酰基辅酶 A 脱氢酶样黄素酶 TdaE 挽救。TdaE 的进一步表征揭示了一种意想不到的复杂催化,包括底物脱氢、非经典 CoA-酯氧解和最终环氧化。因此,该酶作为一种典型的黄素蛋白双加氧酶发挥作用,它结合了来自 O 2的两个氧原子进入底物,最有可能涉及黄素-N5-过氧化物和黄素-N5-氧化物物质,分别用于连续的 CoA-酯裂解和环氧化。随后反应性酶产物的自发脱羧产生托酚酮,它是由病原性土壤植物伯克霍尔德菌引起的水稻穗枯病的关键毒力因子。或者, TdaE产物最有可能转化为更复杂的含硫次生代谢物,例如来自主要海洋红杆菌科(如抑制嗜热菌)的原二硫代硫酸。
Tandem conjugate addition–elimination reaction promoted by chiral pyrrolidinyl sulfonamide (CPS)
作者:Junye Xu、Xiao Fu、Ruijuan Low、Yong-Peng Goh、Zhiyong Jiang、Choon-Hong Tan
DOI:10.1039/b810905m
日期:——
Chiral pyrrolidinyl sulfonamides have been found to promote the conjugate additionâelimination reaction between activated allylic bromides and 1,3-dicarbonyl compounds with high enantioselectivities and the highly functionalised products can be used to generate a variety of interesting enantiomerically pure compounds via simple transformations.
Micellar promiscuity: an expeditious approach to Morita–Baylis–Hillman reaction
作者:Bashir Ahmad Shairgojray、Aijaz Ahmad Dar、Bilal Ahmad Bhat
DOI:10.1016/j.tetlet.2013.02.097
日期:2013.5
An accelerated and efficient method for Morita-Baylis-Hillman (MBH) reaction in aqueous cationic micellar solution under ambient conditions has been developed. The present method holds promise for future use of cyclic and acylic MBH-adducts of general utility in total synthesis of natural products in a robust fashion. (C) 2013 Elsevier Ltd. All rights reserved.
Preparation, reactivity, and spectral properties of 1,3-dioxin vinylogous esters: versatile .beta.-ketovinyl cation equivalents
作者:Amos B. Smith、Bruce D. Dorsey、Masashi Ohba、Andrew T. Lupo、Michael S. Malamas
DOI:10.1021/jo00253a024
日期:1988.9
Molecular Basis of the Antitumor Activities of 2-Crotonyloxymethyl-2-cycloalkenones
作者:Erin Joseph、Julie L. Eiseman、Diana S. Hamilton、Haibo Wang、Heekyung Tak、Zhebo Ding、Bruce Ganem、Donald J. Creighton
DOI:10.1021/jm0203027
日期:2003.1.1
The antitumor activity of 2 crotonyloxymethyl-2-cyclohexenone (COMC-6) is not the result of the GSH conjugate (GSMC-6) formed inside tumor cells, as the diethyl ester prodrug form of GSMC-6 displays little antitumor activity with B16 melanotic melanoma in vitro IC50 > 460 muM) versus COMC-6 (IC50 0.041 muM) and its five- and seven-membered ring homologues. Antitumor activity probably results from a reactive intermediate that forms during conjugation of the COMCs with intracellular GSH.
A Flavoprotein Dioxygenase Steers Bacterial Tropone Biosynthesis via Coenzyme A-Ester Oxygenolysis and Ring Epoxidation
作者:Ying Duan、Marina Toplak、Anwei Hou、Nelson L. Brock、Jeroen S. Dickschat、Robin Teufel
DOI:10.1021/jacs.1c04996
日期:2021.7.14
Bacterial tropone naturalproducts such as tropolone, tropodithietic acid, or the roseobacticides play crucial roles in various terrestrial and marine symbiotic interactions as virulence factors, antibiotics, algaecides, or quorumsensing signals. We now show that their poorly understood biosynthesis depends on a shunt productfrom aerobic CoA-dependent phenylacetic acid catabolism that is salvaged
细菌托酚酮天然产物,如托酚酮、托托二硫代酸或玫瑰杀菌剂,在各种陆地和海洋共生相互作用中起着至关重要的作用,如毒力因子、抗生素、除藻剂或群体感应信号。我们现在表明,它们知之甚少的生物合成依赖于需氧 CoA 依赖性苯乙酸分解代谢的分流产物,该分流产物由专用的酰基辅酶 A 脱氢酶样黄素酶 TdaE 挽救。TdaE 的进一步表征揭示了一种意想不到的复杂催化,包括底物脱氢、非经典 CoA-酯氧解和最终环氧化。因此,该酶作为一种典型的黄素蛋白双加氧酶发挥作用,它结合了来自 O 2的两个氧原子进入底物,最有可能涉及黄素-N5-过氧化物和黄素-N5-氧化物物质,分别用于连续的 CoA-酯裂解和环氧化。随后反应性酶产物的自发脱羧产生托酚酮,它是由病原性土壤植物伯克霍尔德菌引起的水稻穗枯病的关键毒力因子。或者, TdaE产物最有可能转化为更复杂的含硫次生代谢物,例如来自主要海洋红杆菌科(如抑制嗜热菌)的原二硫代硫酸。