重组具有改良特性的D-氨基酸氧化酶

Recombinant D-amino Acid Oxidase with Improved Properties

摘要:

在大肠杆菌细胞中表达三角酵母D-氨基酸氧化酶, 并对重组酶的性质进行了研究。制备的单一突变体与野生型酶相比, 具有2.4倍的热稳定性或底物特异性变化光谱。结果显示突变的TvDAAO在氧化头孢菌素中催化效果优于野生型酶。并将一个突变的重组TvDAAO制备成结晶, 并解析了2.8 ?分辨率下的晶体结构。

关键词:D-氨基酸氧化酶, 三角酵母, 定向诱变, X射线结构

Abstract:

D-amino acid oxidase from Trigonopsis variabilis (TvDAAO) was overproduced in E. coli cells and properties of the recombinant enzyme were studied. Single point mutants of the enzyme with 2.4-fold higher thermal stability or changed spectra of substrate specificity compared to wild-type enzyme were prepared. It was shown that mutant TvDAAO has higher catalytic efficiency in cephalosporin C oxidation in comparison with wild-type enzyme. One mutant of recombinant TvDAAO was crystallized and its structure was solved with resolution 2.8 ?.

Key words:D-amino acid oxidase, Trigonopsis variabilis, directed mutagenesis, X-ray structure.