substrate profile for structurally different cyclohexanones and cyclobutanones was assigned. The enzyme showed a lower activity than that of cyclohexanone monooxygenase (CHMOAcineto ) from Acinetobacter sp., as the prototype BVMO, but indicated higher kinetic stability by showing a twofold longer half-life at 30 °C. The thermodynamic stability, as represented by the melting temperature, resulted in a Tm value
Baeyer-Villiger单加氧酶(BVMOs)是出色的
生物催化剂,但由于其稳定性低,因此在工业上的应用受到了阻碍。因此,迫切需要扩展这种酶的多样性并增加其稳定性。从市政热隐孢子虫(TmCHMO)的已知热稳定BVMO序列开始,鉴定了一种成功在大肠杆菌B
L21(DE3)中表达的新型热解淀粉菌BVMO(BVMOFlava)。研究了纯化酶的活性和稳定性,并确定了结构不同的
环己酮和
环丁酮的底物谱。该酶的活性比不动杆菌属的
环己酮单加氧酶(CHMOAcineto)低,作为原型BVMO,但通过在30°C下显示出两倍长的半衰期,表明具有更高的动力学稳定性。以熔融温度表示的热力学稳定性导致BVMOFlava的Tm值为53.1°C,与TmCHMO的Tm(ΔTm= 1°C)相当,并且显着高于CHMOAcineto的Tm值((ΔTm = 14.6℃)。观察到BVMOFlava的热力学和动力学稳定性之间存在很大