The biocatalytic performance of a cloned cyclohexylamine oxidase derived from Brevibacterium oxydans IH-35A towards structurally different amines was investigated. Cycloalkyl primary amines, alkyl aryl amines, and α-carbon-substituted aliphatic amines were identified as suitable substrates for the biocatalyst based on an activity assay. Kinetic resolutions of several amines by either recombinant whole cells or crude enzyme extracts prepared therefrom gave enantiomerically pure (R)-amines besides the corresponding ketones. When cyclohexylamine oxidase in combination with a borane–ammonia complex as reducing agent was applied to the deracemization of several substrates, excellent enantiomeric ratios (>99:1) and good isolated yields (62%–75%) of the corresponding (R)-amines were obtained.
从Brevibacterium oxydans IH-35A中克隆的环己胺氧化酶的生物催化性能对结构不同的胺进行了研究。基于活性测定,环烷基初级胺,烷基芳基胺和α-碳取代脂肪胺被确定为生物催化剂的合适底物。通过重组整细胞或制备的粗酶提取物对几种胺进行动力学分辨,除了相应的酮外,得到了对映纯的(R)-胺。当将环己胺氧化酶与硼氨复合物作为还原剂应用于几种底物的去消旋作用时,获得了优异的对映比(>99:1)和相应(R)-胺的良好分离收率(62%–75%)。