Efficient biocatalytic C–H bond oxidation: an engineered heme-thiolate peroxygenase from a thermostable cytochrome P450
作者:Alecia R. Gee、Isobella S. J. Stone、Tegan P. Stockdale、Tara L. Pukala、James J. De Voss、Stephen G. Bell
DOI:10.1039/d3cc04626e
日期:——
highly sought after reaction in chemical synthesis is the activation of unactivated carbon–hydrogen bonds. We demonstrate the hydroxylation of fatty acidsusing an engineered thermostable archaeal cytochrome P450 enzyme. By replacing a seven aminoacid section of the I-helix, the nicotinamide cofactor-dependent monooxygenase was converted into a hydrogen peroxide using peroxygenase, enabling the efficient
化学合成中备受追捧的反应是未活化的碳氢键的活化。我们使用工程化的热稳定古菌细胞色素 P450 酶演示了脂肪酸的羟基化。通过替换 I 螺旋的 7 个氨基酸部分,烟酰胺辅因子依赖性单加氧酶使用过加氧酶转化为过氧化氢,从而能够在室温至 90 °C 下对 C-H 键进行有效的生物催化氧化。
Polysaccharide derivative, and preparation process and use thereof
申请人:Kao Corporation
公开号:EP0781780A2
公开(公告)日:1997-07-02
Disclosed herein are a polysaccharide derivative obtainable by substituting a part or the whole of hydrogen atoms of hydroxyl groups in a polysaccharide or a derivative thereof by the following substituents (A) and (B):
(A) a hydrophobic group containing a C10-C40 alkyl, alkenyl or acyl group which may be substituted by an -OH group or into which an oxycarbonyl group (-COO- or -OCO-) may be introduced; and
(B) a C1-C5 sulfoalkyl group which may be substituted by an -OH group, or a salt thereof,
wherein average degrees of substitution by the substituents (A) and (B) per monosaccharide residue are 0.001-1.0 and 0.01-2.0, respectively; a preparation process thereof; and use of the polysaccharide derivative for a thickener for cosmetic compositions.