Characterization and engineering of cephalosporin C acylases to produce 7-Aminocephalosporanic acid
作者:Xiangying Li、Jingang Wang、Wencheng Su、Congcong Li、Ge Qu、Bo Yuan、Zhoutong Sun
DOI:10.1016/j.mcat.2023.113595
日期:2023.11
8-fold increase in specific enzymatic activity (6.1 U/mg) was obtained compared to the wild-type enzyme. The engineered variant also enabled the hydrolysis of a variety of β-lactam antibiotics including Penicillin G and phenylacetyl-7-aminodeacetoxycephalosporanic acid (G-7-ADCA). Overall, this study discovered new CCAs from distinct bacterial origins and enabled the synthesis of various core β-lactam
7-氨基头孢烷酸(7-ACA)是合成β-内酰胺类抗生素的核心核。头孢菌素 C 酰化酶 (CCA) 是一类能够将头孢菌素 C (CPC) 水解为 7-ACA 的酶。在这项研究中,我们鉴定、表征并设计了新的 CCA 来制备 7-ACA。使用组合活性位点饱和测试(CAST)和迭代进化进行多轮半理性酶设计后获得最佳突变体A14(L159S/A419V)。与野生型酶相比,酶比活性增加了 2.8 倍(6.1 U/mg)。该工程变体还能够水解多种 β-内酰胺抗生素,包括青霉素 G 和苯乙酰基-7-氨基脱乙酰氧基头孢菌酸 (G-7-ADCA)。全面的,
PATHOGEN DETECTION
申请人:UNIVERSITY OF NOTRE DAME DU LAC
公开号:US20190352691A1
公开(公告)日:2019-11-21
A device for detecting bacteria in a sample, comprising:
a substrate having a surface; and
a plurality of Fe(III)-bound or Fe(III)-binding siderophores specific to the bacteria and covalently attached to the surface;
wherein the siderophores are selected from the group consisting of one or more natural siderophores, siderophores having one or more of the formulas described herein, or combination thereof. Methods of detection are also provided.