Enzymatic regioselective production of chloramphenicol esters
摘要:
An enzymatic study has been performed in the search for synthetic routes to produce chloramphenicol derivatives through regioselective processes using lipases. Complementary transesterification and hydrolytic reactions have been carried to synthesize chloramphenicol regioisomers. Reaction parameters, such as biocatalyst, solvent, acyl donor, and temperature have been optimised in order to obtain chloramphenicol esters with high yields through acylation processes. Scale-up of the enzymatic reactions (1 g-scale at 0.25 M) and catalyst recycling (up to 10 cycles) have been successfully achieved. Furthermore, monoacylated derivatives at the more hindered secondary position could also be obtained employing hydrolysis processes. (C) 2011 Elsevier Ltd. All rights reserved.
Chemoenzymatic Synthesis of Acyl Coenzyme A Substrates Enables <i>in Situ</i> Labeling of Small Molecules and Proteins
作者:Vinayak Agarwal、Stefan Diethelm、Lauren Ray、Neha Garg、Takayoshi Awakawa、Pieter C. Dorrestein、Bradley S. Moore
DOI:10.1021/acs.orglett.5b02113
日期:2015.9.18
generate fully functional acylcoenzyme A molecules that are then used as substrates to drive in situ acyl transfer reactions is described. Mass spectrometry based assays to verify the identity of acylcoenzyme A enzymatic products are also illustrated. The approach is responsive to a diverse array of carboxylic acids that can be elaborated to their corresponding coenzyme A thioesters, with potential applications
reaction time, enzyme loading and water content on the synthesis of the chloramphenicol esters were studied. The synthesis of chloramphenicol propionate (0.25 M) with 4.0 g L−1 of LipBA loading gave a conversion of ~98% and a purity of ~99% within 8 h at 50 °C in 1,4-dioxane as solvent. The optimum mole ratio of vinyl propionate to chloramphenicol was increased to 5:1. This is the first report of B.
这项工作提出了一种利用脂肪酶的高对映选择性和区域选择性来生产氯霉素酯的合成路线。使用氯霉素、不同碳链长度的酰基供体和脂肪酶LipBA(从解淀粉芽孢杆菌克隆的脂肪酶)合成了一系列氯霉素酯。在具有不同碳链长度的酰基供体中,发现丙酸乙烯酯是最好的。研究了不同有机溶剂、反应温度、反应时间、酶载量和含水量对氯霉素酯合成的影响。使用 4.0 g L-1 LipBA 负载合成氯霉素丙酸酯 (0.25 M),在 1,4-二恶烷作为溶剂中,50 °C 下,8 小时内转化率约为 98%,纯度约为 99%。丙酸乙烯酯与氯霉素的最佳摩尔比提高到5:1。这是首次报道解淀粉芽孢杆菌脂肪酶用于氯霉素酯合成,并详细研究了使用该反应合成丙酸氯霉素。高酶活性和选择性使脂肪酶 LipBA 成为具有复杂结构的分子的绿色化学合成的有吸引力的催化剂。
Isolation of 3′-O-Acetylchloramphenicol: A possible intermediate in chloramphenicol biosynthesis
作者:Frank Groß、Elizabeth A. Lewis、Mahmood Piraee、Karl-Heinz van Pée、Leo C. Vining、Robert L. White
DOI:10.1016/s0960-894x(01)00739-9
日期:2002.2
ol, commonly formed from chloramphenicol by resistant bacteria, has been isolated from the antibiotic-producing organism. Biosynthetic experiments suggest that it is a protected intermediate in chloramphenicol biosynthesis, implicating acetylation as a self-resistance mechanism in the producing organism.
The importance of the amide bond nearest the thiol group in enzymatic reactions of coenzyme A
作者:Jin Xun、Haidong Huang、Kurt W. Vogel、Dale G. Drueckhammer
DOI:10.1016/j.bioorg.2004.10.002
日期:2005.4
Analogues of coenzyme A (CoA) and of CoA thioesters have been prepared in which the amide bond nearest the thiol group has been modified. An analogue of acetyl-CoA in which this amide bond is replaced with an ester linkage was a good substrate for the enzymes carnitine acetyltransferase, chloramphenicol acetyltransferase, and citrate synthase, with K(m) values 2- to 8-fold higher than those of acetyl-CoA
RAPID DISCOVERY AND SCREENING OF ENZYME ACTIVITY USING MASS SPECTROMETRY
申请人:THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
公开号:US20150330992A1
公开(公告)日:2015-11-19
Described herein are methods, systems, and compositions for detecting enzyme activity. In some embodiments, the reaction product(s) are coupled with a mass tag, and the enzyme activity is determiner by analyzing the reaction product(s). The enzyme assays can be performed using mass spectrometry, for example nanostructure-initiator mass spectrometry (NIMS). Also described are methods, systems, and compositions for monitoring enzymatic degradation process of a substrate sample, for example a biomass.