[EN] ENZYMATIC METHODS FOR ISOBUTANOL PRODUCTION<br/>[FR] PROCÉDÉS ENZYMATIQUES POUR LA PRODUCTION D'ISOBUTANOL
申请人:NEWPEK S A DE C V
公开号:WO2016097801A1
公开(公告)日:2016-06-23
The present invention relates to a process of producing isobutanol, including: mixing water, lactate, an enzyme mixture including at least one enzyme, at least one cofactor, and at least one coenzyme, to prepare a reaction mixture; allowing catalytic conversions of lactate in the reaction mixture for a sufficient amount of time to produce isobutanol; and separating the isobutanol from a reactant obtained by the catalytic conversions, in which the conversion of lactate into isobutanol is in association with a NAD+/NADH and/or NADP+/NADPH regenerating system.
Glyoxylate Carboligase: A Unique Thiamin Diphosphate-Dependent Enzyme That Can Cycle between the 4′-Aminopyrimidinium and 1′,4′-Iminopyrimidine Tautomeric Forms in the Absence of the Conserved Glutamate
作者:Natalia Nemeria、Elad Binshtein、Hetalben Patel、Anand Balakrishnan、Ilan Vered、Boaz Shaanan、Ze’ev Barak、David Chipman、Frank Jordan
DOI:10.1021/bi300893v
日期:2012.10.9
glyoxylate to form tartronate semialdehyde (TSA). This enzyme is unique among ThDP enzymes in that it lacks a conserved glutamate near the N1′ atom of ThDP (replaced by Val51) or any other potential acid–base side chains near ThDP. The V51D substitution shifts the pH optimum to 6.0–6.2 (pKa of 6.2) for TSA formation from pH 7.0–7.7 in wild-type GCL. This pKa is similar to the pKa of 6.1 for the 1′,4′-iminopyrimidine
Characterization of acetolactate decarboxylase of Streptococcus thermophilus and its stereoselectivity in decarboxylation of α-hydroxy-β-ketoacids
作者:Zi-Qi Zheng、Cai-Yun Luo、Han Chen、Huan Sun、Xian Hui、Zi-Dong Chen、Wen-Yun Gao、Heng Li
DOI:10.1016/j.bioorg.2022.105719
日期:2022.5
catabolic enzyme catalyzes the decarboxylation of (±)-acetolactate to produce a single product, (R)-acetoin. It can also convert other racemic α-hydroxy-β-ketoacids to corresponding α -hydroxyketones in R-configuration. In this work, we prepared ALDC of Streptococcus thermophilus (StALDC) and explored its stereoselectivity on different substrates. The enzyme displays no enantioselectivity on substrate
乙酰乳酸脱羧酶 (ALDC) 是一种充分表征的分解代谢酶,可催化 (±)-乙酰乳酸脱羧生成单一产物 ( R )-乙偶姻。它还可以将其他外消旋的α-羟基-β-酮酸转化为相应的R-构型的α-羟基酮。在这项工作中,我们制备了嗜热链球菌(StALDC) 的 ALDC,并探索了它在不同底物上的立体选择性。该酶对底物 (±)-乙酰乳酸不显示对映选择性,但对产物乙偶姻显示R-选择性,这与各种 ALDC 报告的数据相同。然而,当化合物 (±) - 2-propionyl-2-hydroxybutyrate 用作底物时,酶表现出S-对底物和产物均具有选择性,即只能将( S ) -2-丙酰基-2-羟基丁酸脱羧生成( S ) -4-羟基-3-己酮,而不是其R-异构体,这完全不同于为枯草芽孢杆菌ALDC 公布的数据。据我们所知,这是首次报道ALDC的底物依赖性对映选择性,并在同源性建模和分子对接实验的基础上讨论了StALDC的特征。
Hydrocortisone esters, pharmaceutical formulations containing these and
申请人:Merck Patent Gesellschaft mit Beschrankter Haftung
公开号:US04264585A1
公开(公告)日:1981-04-28
Hydrocortisone esters of the formula ##STR1## wherein R.sup.1 is H, formyl or acetyl and R.sup.2 is H or CH.sub.3 are antiphlogistically active.