Characterization of FabG and FabI of the<i>Streptomyces coelicolor</i>Dissociated Fatty Acid Synthase
作者:Renu Singh、Kevin A. Reynolds
DOI:10.1002/cbic.201402670
日期:2015.3.2
Functional crosstalk: β‐Ketoacyl‐acyl carrier protein (ACP; FabG) and enoyl‐ACP reductase (FabI) from Streptomyces coelicolor were identified and characterized. Kinetic analysis demonstrated that these enzymes process straight and branched‐chain substrates along with the ACPs from both fattyacid and undecylprodiginine biosynthetic pathways. This relaxed substrate specificity allow these enzymes to
The oxidation of alcohols to aldehydes or ketones is a highly relevant conversion for the pharmaceutical and fine-chemical industries, and for biomass conversion, and is commonly performed using stoichiometric amounts of highly hazardous oxidants. The aerobicoxidation of alcohols with transition metal complex catalysts previously required complicated organic ligands and/or nitroxyl radicals as co-catalysts
醇氧化为醛或酮对于制药和精细化学工业以及生物质转化而言是高度相关的转化,并且通常使用化学计量的高度危险的氧化剂进行。先前使用过渡金属络合物催化剂对醇进行好氧氧化需要复杂的有机配体和/或硝酰基自由基作为助催化剂。在这里,我们报告了一种高效且环保的方法,可使用无机配体负载的铜催化剂1(NH 4)4 [CuMo 6 O 18(OH)6 ]和O 2(1 atm )来促进醇的需氧氧化)作为唯一的氧化剂。催化剂1它是由廉价且普遍使用的(NH 4)6 Mo 7 O 24 ·4H 2 O和CuSO 4直接合成的,CuSO 4由纯的无机骨架组成,该骨架由中心的Cu II核构建而成,并由六个Mo VI O 6无机支架支撑。铜催化剂1在醇的催化氧化中对多种底物表现出优异的选择性和活性,并且可以避免使用有毒的氧化剂,硝酰基自由基以及潜在的对空气/湿气敏感的复杂的有机配体,而这些配体是不可商购的。由于其坚固的无机骨
Concise Chemoenzymatic Total Synthesis and Identification of Cellular Targets of Cepafungin I
The naturalproduct cepafungin I was recently reported to be one of the most potent covalent inhibitors of the 20S proteasome core particle through a series of in vitro activity assays. Here, we report a short chemoenzymatic total synthesis of cepafungin I featuring the use of a regioselective enzymatic oxidation to prepare a key hydroxylated amino acid building block in a scalable fashion. The strategy
最近通过一系列体外研究报道,天然产物头孢芬净I是20S蛋白酶体核心颗粒最有效的共价抑制剂之一。活性测定。在这里,我们报告了头孢芬净 I 的简短化学酶促全合成,其特点是使用区域选择性酶促氧化以可扩展的方式制备关键的羟基化氨基酸构建块。本文开发的策略使得能够使用化学蛋白质组学探针,这反过来揭示了头孢芬净 I 对蛋白酶体 β2 和 β5 亚基的特殊选择性和效力。进一步的构效关系研究表明羟基在大环中的关键作用和脂质尾部在调节该天然产物家族效力方面的特性。本研究为进一步的药物化学探索奠定了基础,以充分发挥头孢芬净 I 的抗癌潜力。
Piperidine derivatives
申请人:SANKYO COMPANY LIMITED
公开号:EP0583971A1
公开(公告)日:1994-02-23
Compounds of formula (I):
wherein:
R represents H or a mono- or poly- carboxylic acyl group;
R¹ represents H or a carboxylic ester moiety;
R² represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or an aralkyl group, said groups being optionally substituted, or R² represents a carboxylic ester moiety;
n = 1 - 4;
Y is O or S;
and esters thereof,
are useful as heat and photo- stabilisers for polymeric materials.
Tuning Product Selectivity in Catalytic Hydroformylation Reactions with Carbon Dioxide Expanded Liquids
申请人:Subramaniam Bala
公开号:US20070219399A1
公开(公告)日:2007-09-20
An improved hydroformylation process is provided, which comprises reacting an olefin with CO and H
2
in the presence of a hydroformylation catalyst in a liquid that has been volumetrically expanded with a compressed gas, such as supercritical carbon dioxide.