3-methyl-2-oxobutanoate hydroxymethyltransferase from E. coli (KPHMT) and variants thereof. The 3,3,3-trisubstituted 2-oxoacids thus produced were converted into 2-oxolactones and 3-hydroxy acids and directly to ulosonic acid derivatives, all bearing gem-dialkyl, gem-cycloalkyl, and spirocyclic quaternary centers. In addition, some of these reactions use a single enantiomer from racemic nucleophiles to afford
family PF03328, recently described to be able to use hydroxypyruvic acid as nucleophile substrate, were shown to also catalyse aldol adducts formation from 2‐oxobutyric acid. A 1H NMR‐based assay was used to screen 21 aldolases for their activity towards 2‐oxobutyric acid and to predict their stereoselectivity at position 3 of the aldol adducts. The best biocatalysts were then proved to be strictly (3S)‐selective
Metallkomplexe von Farbstoffen, XII [1], Halbsandwich-Komplexe von Ruthenium, Cobalt, Rhodium, Iridium mit Iminocarboxylaten aus 4-(4′-Nitrophenylazo)anilin (Disperse Orange 3) oder 4,4′-Diaminoazobenzol und 2-Oxocarboxylaten. Metal Complexes of Dyes, XII
作者:Frank Kühlwein、Wolfgang Beck
DOI:10.1002/zaac.201000162
日期:2010.11
: Beck, Wolfgang, wbe@cup.uni-muenchen.de merged with this user on 29-May-2008 by Knapp, Jeanette (Beck, Wolfgang)
Quinoline tricyclic derivatives. Design, synthesis and evaluation of the antiviral activity of three new classes of RNA-dependent RNA polymerase inhibitors
作者:Antonio Carta、Irene Briguglio、Sandra Piras、Paola Corona、Giampiero Boatto、Maria Nieddu、Paolo Giunchedi、Maria Elena Marongiu、Gabriele Giliberti、Filippo Iuliano、Sylvain Blois、Cristina Ibba、Bernardetta Busonera、Paolo La Colla
DOI:10.1016/j.bmc.2011.10.009
日期:2011.12
CVB-5, Reo-1 and RSV. However, derivatives belonging to all classes showed activity against BVDV. Among the most potent were the bis-triazoloquinoline 1m, the imidazoquinolines 2e and 2h, and the pyridoquinoxalines 4h, 4j and 5n (EC50 range 1–5 μM). When tested in a replicon assay, compound 2h was the sole derivative to also display anti-HCV activity (EC50 = 3.1 μM). In enzyme assays, 1m, 2h, 5m and 5n
在这项研究中,合成了三类新的线性N-三环化合物,它们是由喹啉核与1,2,3-三唑,咪唑或吡嗪缩合而得到的,获得了三唑并[4,5- g ]喹啉,咪唑并[4]。分别是,5-5- g喹啉和吡啶并[2,3- g ]喹喔啉。标题化合物中的细胞毒性和抗病毒活性的基于细胞的测定中测试抗RNA病毒代表三个属的的黄病毒科家族,即BVDV(瘟病毒),YFV(黄病毒属)和HCV(丙型肝炎病毒属)。喹啉衍生物也针对含有单链,无论正义(单链RNA其他RNA病毒科的代表测试+)或负义(RNA - ,和双链基因组(双链RNA),以及针对两个代表) DNA病毒家族。尽管对CVB-5,Reo-1和RSV具有选择性活性,但一些喹啉类药物显示中等程度的活性。但是,属于所有类别的衍生物均显示出对BVDV的活性。最有效的是双三唑并喹啉1m,咪唑并喹啉2e和2h以及吡啶并喹喔啉4h,4j和5n(EC 50范围1-5μM)。当在复制子
Absolute configuration of the product of the acetolactate synthase reaction by a novel method of analysis using acetolactate decarboxylase
作者:David H. G. Crout、Edward R. Lee、Daniel L. Rathbone
DOI:10.1039/p19900001367
日期:——
2-oxobutanoate were incubated with acetolactatesynthase [acetolactate pyruvate lyase (carboxylating, EC 4.1.3.18)] in the presence of acetolactatedecarboxylase [(S)-2-hydroxy-2-methyl-3-oxobutanoate carboxy-lyase, EC 4.1.1.5)]. The exclusive production of 3-hydroxypentan-2-one showed that the α-acetohydroxybutyrate (2-ethyl-2-hydroxy-3-oxobutanoate) produced by acetolactatesynthase had the (S)-configuration
在乙酰乳酸脱羧酶[(S)-2-羟基-2-甲基-3-氧代丁酸羧裂合酶,EC的存在下,将丙酮酸和2-氧代丁酸与乙酰乳酸合酶[乙酰丙酮酸丙酮酸裂合酶(羧化,EC 4.1.3.18)]一起孵育。4.1.1.5)]。独家生产的3-羟基戊烷-2-酮表明,乙酰乳酸合酶生产的α-乙酰羟基丁酸酯(2-乙基-2-羟基-3-氧代丁酸酯)具有(S)构型。的能力乳酸脱羧酶催化(重排- [R )衬底的对映异构体经由羧酸迁移使用[3,4研究13 Ç 2]-α-乙酰乳酸,其中正常底物重排的简并性被同位素标记破坏。观察到[1,2- 13 C 2 ]-和[3,4- 13 C 2 ]-乙醛的预测顺序形成。