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黄孢原毛平革菌过氧化物酶的分离、纯化和酶学特性研究

Keywords: 木质素过氧化物酶,锰依赖过氧化物酶,黄孢原毛平革菌,酶的纯化,酶学特性

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Abstract:

从木质素降解菌Phanerochaetechrysosporium中纯化出两种木质素降解酶:木质素过氧化物酶(LiP)和锰依赖过氧化物酶(MnP)。经测定LiP和MnP的分子量分别为37kD和40kD,最适作用温度均是37℃;保温2h,LiP的半失活温度为40℃,MnP为45℃;LiP最适作用pH2.8,稳定pH2.2~5.2;MnP最适作用pH4.6,稳定pH4.0~7.0。Fe2+对LiP和MnP均表现出促进作用,Na+、K+、Ca2+、Mg2+、Zn2+、Fe3+、Ag+、Co2+、NH4+对LiP有促进作用,对MnP则表现出抑制作用。与此相反,Mn2+对MnP酶活的高效促进作用,对LiP表现出了轻度的抑制作用,这也体现出了MnP对Mn2+的依赖性。Cu2+对LiP活性无影响,而对MnP有强烈的抑制作用。Fe3+对两者活性的抑制都达到了90%。

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